JP2018135958A - Rolling bearing device for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device for transmission that has neither too much nor too little lubricating oil or lubricating grease between a plurality of elastic seal rings for preventing creeping, and can stably prevent abrasion damage to have superior durability.SOLUTION: A rolling bearing device has an outer ring 1 fixed by gap fitting to a housing H in a transmission, two circumferential grooves 7 are formed axially at an interval on an outer peripheral surface of the outer ring 1, and a lubricant G is held in an outer ring outside space S surrounded with an elastic seal ring 8 fitted in the circumferential grooves 7, the housing H, and an outer peripheral surface 1b of the outer ring 1. The housing H is provided with an oil supply path 9 so that a gear space where oil contents g scatter from a gear mechanism in the transmission and the outer ring outside space S communicate with each other. The water contents scattering from the gear mechanism are supplied to the outer ring outside space S through the oil supply path 9, and neither too much nor too little in the outer ring outside space S.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing device for a transmission that can be employed in a rolling bearing that supports a shaft of an automobile transmission and has a creep prevention function in combination with an improved housing.

  In general, in a non-separable type rolling bearing such as a deep groove ball bearing that supports a shaft of an automobile transmission, an outer ring is fixed to a fitting surface of a housing by a clearance fit so that an attaching / detaching operation and an adjusting operation are possible. Yes.

  In recent years, there is a tendency for the rotation of the shaft of an automobile transmission to be accelerated by a motor in an electric vehicle or a hybrid vehicle, and the inner ring that supports the rotating shaft rotates at a high speed, which is called creep between the outer ring and the housing. A slip phenomenon is likely to occur.

  The creep phenomenon described above is caused by the difference between the outer diameter of the outer ring and the inner diameter of the housing between the outer ring and the housing of the rolling bearing fitted with a gap, so that the outer ring outer circumferential surface is inscribed in the housing inner circumferential surface while the inner ring rotates. However, when rolling, an unbalanced radial load is generated around the rotation axis, and the outer ring outer peripheral surface, the housing, and other peripheral parts are easily worn by sliding.

Known rolling bearing C ₁ shown in FIG. 6, as a means for preventing wear, such as the outer peripheral surface and the housing H of the outer ring 20 due to the creep phenomenon, axially spaced on an outer peripheral surface of the clearance fit has been the outer ring 20 to the housing H Two circumferential grooves 21 are formed with a gap between them, and each circumferential groove 21 is fitted with two elastic rubber O-rings 22 in combination, and is applied between the two O-rings 22. A lubricant G made of lubricating oil or lubricating grease can be held for a relatively long time (Patent Document 1).

The rolling bearing C ₁ suppresses creep by the frictional force of the O-ring 22 against the housing H, and the outer ring 20 is supported by a fluid thin film of the lubricant G. The so-called squeeze effect causes fluctuations in the load direction received by the outer ring 20. Accordingly, rapid approach of the outer peripheral surface of the outer ring 20 to the housing H can be suppressed, so that even if creep occurs, wear damage hardly occurs.

JP 2008-8408 A

However, in the conventional anti-creep rolling bearing C ₁ described above, the lubricant held between the O-rings arranged at a predetermined interval leaks out little by little as the O-ring elastically deforms. Therefore, a plurality of O-rings are arranged adjacent to each other in order to prevent this, but it is still difficult to completely prevent the oil outflow.

  Therefore, in order to meet the demand for longer life for the same type of bearings, the lubricant or lubrication grease that has higher durability than previously assumed and is held between multiple elastic seal rings What is desired is a creep-proof rolling bearing capable of preventing wear damage for a long period of time.

  Accordingly, an object of the present invention is to solve the above-described problems, and the rolling bearing mounted in the transmission housing can prevent creep by a plurality of elastic seal rings, and also stably squeeze the oil film on the outer peripheral surface of the outer ring. This is to achieve an effect, and thereby to realize a rolling bearing device for a transmission that is excellent in durability and capable of preventing wear damage of the housing.

  In order to solve the above-mentioned problems, in the present invention, there is provided a rolling bearing device for a transmission comprising a transmission housing, a rotating shaft, and a rolling bearing that supports the rotating shaft on the housing. The bearing includes an outer ring fixed to the housing by a clearance fit, an inner ring that holds the rotating shaft, and a plurality of rollable rollers that are held between an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring. And a plurality of elastic seal rings fitted in a plurality of circumferential grooves formed on the outer peripheral surface of the outer ring at axial intervals, the plurality of elastic seal rings, the housing, and the outer ring outer periphery. Lubricant is held in the outer ring outer space surrounded by the surface, and the gear space in which oil is scattered from the gear mechanism in the transmission communicates with the outer ring outer space. Oil passage is to that the rolling bearing device for a provided transmission.

  In the rolling bearing device for transmission of the present invention configured as described above, a lubricant made of lubricating oil or lubricating grease is provided in an outer ring outer space surrounded by a plurality of elastic seal rings, the housing, and the outer ring outer peripheral surface. Since it is held, wear damage due to contact between the outer diameter surface of the outer ring and the housing is prevented by the lubricating oil or lubricating grease from the beginning of operation.

Even when a small amount of lubricating oil or lubricating grease leaks due to the elastic deformation of the elastic seal ring in the usage state of the rolling bearing, the gear space from the gear mechanism lubricated with the lubricating oil or lubricating grease in the transmission is used. The oil scattered on the outer ring is supplied to the outer ring outer space through the oil supply passage. The amount of oil supply is an amount that can compensate for at least a small amount of leakage, so that the outer ring outer space does not have insufficient oil for lubrication.
In other words, the required amount of lubricating oil or lubricating grease held between the plurality of elastic seal rings is not replenished by indirect “splashing lubrication”, and is not due to contact with the outer ring of the housing over a long period of time. Rolling bearings that can prevent wear damage.

  The form of the above-described oil supply passage is not particularly limited as long as it has the desired effect as described above. For example, if a groove-shaped oil supply passage is used in which a surface facing the outer ring outer space of the housing and a surface facing the gear space are cut out, a predetermined surface of the housing may be cut. The forming operation can be performed efficiently.

  The oil supply passage may be an oil supply passage including a hole penetrating the housing. In this case, the operation of drilling the oil supply passage from the surface of the housing is not easy compared to the above-described forming operation by cutting the groove. However, in the case of an oil supply path consisting of a hole penetrating the housing, it is easy to place the opening at an appropriate position on the surface of the housing, and the oil supply path is arranged at an angle that makes it easy to take in and transfer oil splashed by the gear it can.

  When the rotating shaft is a rotating shaft of a gear mechanism, oil scattered from the gear mechanism along the rotating shaft can be introduced into the oil supply passage, so that lubricating oil or the like can be efficiently supplied to the outer ring outer space.

  In this case, the hole diameter, groove width, and depth of the oil supply passage are made as small and compact as possible so as not to hinder the improvement of the oil supply efficiency to prevent a decrease in the strength of the housing and the required mechanical strength of the rolling bearing device. It is preferable not to impair.

  Further preferably, the oil supply passage is arranged such that the opening end of the oil supply passage on the gear space side faces the axial end surface of the gear, and between the tooth portion in the radial direction of the gear and the insertion hole of the rotary shaft. It is arranged. With this arrangement, when oil is splashed between the gear teeth and the rotating shaft, the splashed oil is efficiently recovered and supplied to the outer ring outer space via the oil supply passage. The

  The present invention includes a gear space in which oil is scattered from a gear mechanism lubricated with lubricating oil or lubricating grease in a transmission, an outer ring outer space surrounded by a plurality of elastic seal rings, the housing, and the outer ring outer peripheral surface, The rolling bearings installed in the transmission housing can prevent creep by a plurality of elastic seal rings, and the oil film on the outer peripheral surface of the outer ring is not cut off, so that stable squeeze can be achieved. An effect can be obtained, and a rolling bearing device for transmission excellent in durability that can prevent wear damage of the housing can be realized.

Sectional drawing which shows schematic structure of the transmission principal part which shows 1st Embodiment. Sectional drawing which expands the principal part of FIG. 1 and shows a rolling bearing apparatus Sectional view taken along the line III-III showing the main part of FIG. Sectional drawing which shows the rolling bearing apparatus of 2nd Embodiment. Sectional drawing seen from the axial direction which expands and shows the principal part of 2nd Embodiment Sectional view of the main part showing a conventional example

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1-3, the transmission rolling bearing device A of the first embodiment is a rolling bearing device A of fixing the outer ring 1 with clearance fit into the housing H in an automobile transmission, the rolling bearing A ₁ is A rolling element 5 made up of a plurality of rollable balls is held between the outer peripheral surface of the inner ring 2 and the inner peripheral surface of the outer ring 1 while holding the rotating shaft 4 of the gear mechanism having a plurality of gears 3 in the inner ring 2. keeping.

  In this embodiment, a seal member 6 (FIG. 2) is provided for sealing both ends of the bearing space in the axial direction. The appearance is annular, and the entire surface is made of a rubber material having rubber-like elasticity. One side edge of the outer diameter side of the outer ring 1 is press-fitted and fixed in the seal mounting groove 1a of the outer ring 1, and a bifurcated elastic seal lip 6b is elastically pressed against the race and slides on the inner edge. Sealing is possible.

A plurality of circumferential grooves 7 are formed on the outer circumferential surface of the outer ring 1 at intervals in the axial direction, and an elastic seal ring 8 fitted to the circumferential groove 7 is provided. A lubricant G made of lubricating oil or lubricating grease is held in the outer ring outer space S surrounded by the plurality of elastic seal rings 8, the housing H, and the outer peripheral surface 1 b of the outer ring 1.
The housing H has a surface facing the outer ring outer space S in the housing H and the gear space so that a space (gear space) in which the oil g is scattered from the gear mechanism in the transmission communicates with the outer ring outer space S. A groove-shaped oil supply passage 9 is provided by cutting away the surface facing the.

  The housing H referred to in the present invention may be any housing as long as it is disposed in the transmission, and includes a housing H that covers the entire transmission and a portion that is attached to the housing H so as to project inward.

  The shape of the circumferential groove 7 is not particularly limited, and a known shape such as a square groove or a circular groove can be adopted. Such a circumferential groove 7 is formed by cutting or molding two or more plural grooves as necessary with an interval in the axial direction of the outer ring 1.

  The elastic seal ring 8 fitted to the circumferential groove 7 so that a part thereof is aligned is an annular body having rubber-like elasticity, and its cross-sectional shape is circular, elliptical, square, polygonal, etc. Ordinarily, an O-ring is used.

  The material of the elastic seal ring 8 is not particularly limited, and employs a well-known sealing resin, rubber or thermoplastic elastomer, for example, oil-resistant rubber (butyl rubber, ethylene / propylene rubber, chloroprene rubber). , Silicone rubber, etc.), nylon (polyamide resin), polyether sulfone, polyacetal resin, polybutylene terephthalate (PBT) resin, ethylene-tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene-perfluoroalkyl vinyl ether A resin composition in which a single resin or two or more mixed resins such as a copolymer (PFA) is used and additives are appropriately blended can be employed.

The outer ring 1 of the rolling bearing A ₁ is loosely fitted to the fitting surface of the housing H and receives a stationary load. As shown in FIG. 2, in the outer ring outer space S surrounded by the elastic seal ring 8, the housing H, and the outer peripheral surface 1b of the outer ring 1 respectively installed in the two circumferential grooves 7, there is a lubricant. G is held. The lubricant G is held in a state in which the outer ring 1 of the rolling bearing is loosely fitted while being applied to the housing H or the outer ring 1.

  By the way, the housing H is provided with at least one groove-shaped oil supply passage 9 by cutting out a surface facing the outer ring outer space S into a circular groove shape. The form of the groove of the oil supply passage 9 is not particularly limited, and may be a square groove or a well-known groove.

The oil supply passage 9 is provided so that a space (gear space) in which the oil g is scattered from the gear 3 of the gear mechanism lubricated with the lubricating oil or lubricating grease in the transmission communicates with the outer ring outer space S.
Specifically, as shown in FIG. 1, the opening end 9 a of the oil supply passage 9 on the space (gear space) side where the oil component g scatters from the gear 3 of the gear mechanism is arranged to face the axial end surface of the gear 3. And it is preferable to arrange this open end 9a between the tooth portion 3a in the radial direction of the gear 3 and the insertion hole 3b of the rotating shaft.

The lubricating grease and lubricating oil of the lubricant G held in the outer ring outer space S can be the same as those used for lubricating the gear mechanism, and the type is not particularly limited.
Incidentally, the lubricating grease contains at least a base oil and a thickener. The base oil is divertable to lubricating oil, and is, for example, mineral oil alone or a mixed oil of mineral oil and poly-α-olefin (hereinafter referred to as “PAO”) oil. As mineral oil, what is normally used with lubricating oil, such as paraffinic mineral oil and naphthenic mineral oil, can be used, for example. As mineral oils, naphthenic mineral oils such as cyclohexane and cyclopentane are excellent in use conditions at low temperatures of automobiles.

  Thickeners that are components of lubricating grease include benton, silica gel, fluorine compound, lithium soap, lithium complex soap, calcium soap, calcium complex soap, soaps such as aluminum soap, aluminum complex soap, diurea compound, polyurea compound, etc. These urea compounds are mentioned.

  The lubricating grease may contain a known grease additive as required. Examples of additives include antioxidants such as organic zinc compounds, amines, and phenolic compounds, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, and solids such as molybdenum disulfide and graphite. Examples thereof include a lubricant, a metal sulfonate, a rust preventive agent such as a polyhydric alcohol ester, a friction reducing agent such as organic molybdenum, an oily agent such as ester and alcohol, and an antiwear agent such as a phosphorus compound. These can be added alone or in combination of two or more.

As shown in FIGS. 4 and 5, the transmission rolling bearing device B according to the second embodiment of the present invention is obtained by changing the form and arrangement of the oil supply passage in the first embodiment. This is the same as the embodiment.
That is, the oil supply passage 10 employed in the second embodiment is an oil supply passage 10 including a hole penetrating the housing H.

  Such an oil supply path 10 passes through one end of the outer ring outer space S surrounded by the elastic seal ring 8, the housing H, and the outer peripheral surface 1 a of the outer ring 1, which are respectively installed in the two circumferential grooves 7. The other end is opened on a suitable surface of the housing H, and the opening 10a is a space in which the oil g is scattered from the gear mechanism having the gear 3 lubricated with lubricating oil or lubricating grease in the transmission. It is opened facing (gear space).

In the above-described embodiment, the rolling bearings A ₁ and B ₁ are both deep groove ball bearings, but may be angular ball bearings or other well-known ones, and other than the balls illustrated as rolling elements. Of course, a cylindrical roller or a tapered roller may be used, and a roller bearing may be used.

  In the first and second embodiments configured as described above, since the lubricant G is held in the outer ring outer space S, the lubrication state by the lubricant G can be maintained from the beginning of the operation of the rolling bearing. Wear damage due to contact between the outer diameter surface and the housing is prevented.

  Then, the oil g of the lubricating oil or the lubricating grease scattered from the gear mechanism in the transmission is supplied to the outer ring outer space S through the oil supply passages 9 and 10. Since the amount of oil supply is an amount that can compensate for at least a small amount of leakage, the outer ring outer space S does not have insufficient lubricating oil or the like necessary for lubrication.

  Therefore, in the first and second embodiments, creep can be prevented by the plurality of elastic seal rings 8, and a stable squeeze effect can be obtained by keeping the oil film on the outer peripheral surface 1a of the outer ring 1, and wear damage of the housing H can be obtained. This is a rolling bearing device for transmissions that is excellent in durability and can be prevented.

DESCRIPTION OF SYMBOLS 1,20 Outer ring 1a Seal mounting groove 1b Outer peripheral surface 2 Inner ring 3 Gear 3a Tooth part 3b Insertion hole 4 of rotating shaft 4 Rotating shaft 5 Rolling element 6 Seal member 6b Seal lip 7, 21 Circumferential groove 8, 22 Elastic seal ring (O-ring) )
9, 10 Oil supply path rolling bearing device A, B
A ₁ , B ₁ , C ₁ Rolling bearing H Housing S Outer ring outer space G Lubricant g Oil content

Claims (4)

A transmission housing;
A rotation axis;
A rolling bearing device for transmission comprising a rolling bearing for supporting the rotating shaft on the housing,
The rolling bearing includes a plurality of rollable rollers that are held between an outer ring fixed to the housing by a clearance fit, an inner ring that holds the rotating shaft, and an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring. Rolling elements, and a plurality of elastic seal rings fitted in a plurality of circumferential grooves formed at intervals in the axial direction on the outer peripheral surface of the outer ring,
A lubricant is held in the outer ring outer space surrounded by the plurality of elastic seal rings, the housing, and the outer ring outer peripheral surface,
A transmission rolling bearing device provided with an oil supply passage that communicates a gear space in which oil is scattered from a gear mechanism in the transmission and the outer ring outer space.   The rolling bearing device for a transmission according to claim 1, wherein the oil supply passage is a groove-like oil supply passage in which a surface of the housing facing the outer ring outer space and a surface of the housing facing the gear space are cut out.   The rolling bearing device for transmission according to claim 1, wherein the oil supply passage is an oil supply passage including a hole penetrating the housing.   The rotating shaft held by the inner ring is a rotating shaft of a gear mechanism, an opening end on the gear space side of the oil supply passage is disposed to face an axial end surface of the gear, and a tooth portion in the radial direction of the gear The rolling bearing device for transmission according to any one of claims 1 to 3, which is disposed between the insertion hole of the rotary shaft.

Images