A welded bearing cage

Abstract

The application discloses a welded bearing retainer, which comprises a first ring beam, a second ring beam and a plurality of bent window beams, and a pocket hole for mounting a rotating body is surrounded between two adjacent bent window beams and the first ring beam and the second ring beam; the bent window beam comprises a bent part and a first part and a second part symmetrically arranged at two ends of the bent part, a first oil passing groove is arranged on one side of the first ring beam and the second ring beam facing the pocket hole; the first part and the second part are provided with a first pressing slope surface on one side facing the pocket hole, the bent part comprises a straight line segment and a bent segment at two ends of the straight line segment, the bent segment is provided with a second pressing slope surface on one side facing the pocket hole, and the straight line segment is further provided with an oil passing inclined surface on one side facing the pocket hole, the oil passing inclined surface has an oil passing gap with the rotating body, and the bent segment has an arc-shaped bending structure. The structure can improve the flowability of lubricating grease, improve the lubricating effect of the retainer, reduce the rotating friction loss, and improve the durability and safety of the whole bearing structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing retainer, and particularly relates to a welded bearing retainer. BACKGROUND

[0002] The cylindrical roller bearing is a cylindrical roller centripetal rolling bearing, and the internal structure of the cylindrical roller bearing adopts parallel arrangement of rollers, and interval retainers or isolation blocks are arranged between the rollers. The bearing retainer is an isolation structure which uniformly spaces the rolling elements of the rolling element bearing around the raceway.

[0003] At present, the ordinary form cylindrical roller bearing has a large torque, a large contact area between the roller and the retainer, and relatively large friction, which shortens the service life of the whole bearing. In the disclosed technology, the window beam of the pocket is designed as a bent shape of the retainer, but in the actual use process, the contact area between the upper and lower ends of the retainer and the upper and lower end faces of the roller is large and lubrication is insufficient, which leads to increased friction between the roller and the retainer and easy heating, the roller is prone to axial movement, which leads to unstable contact between the upper and lower ends of the roller and the retainer, and the structure strength of the retainer is rapidly reduced, which affects the normal use of the retainer and even the bearing. In addition, the existing bent window beam bending part is a bevel, which is prone to stress concentration problems, and the window beam is continuously in contact with the roller and is subjected to extrusion impact, so the risk of fracture is very high.

[0004] In addition, the existing welding retainer processing technology usually includes the stamping processing of the window hole and the window beam in the early stage and the coiling, welding and other processing steps in the later stage, and the stamping processing in the early stage of the existing welding retainer processing technology usually needs multiple positioning clamping, which is prone to large cumulative error, affecting the processing precision and processing efficiency.

[0005] Therefore, the existing technology still has certain defects. SUMMARY

[0006] The application provides a welded bearing retainer to solve at least one of the above technical problems.

[0007] The technical scheme adopted by the application is as follows:

[0008] A welded bearing retainer, comprising a first ring beam, a second ring beam and a plurality of bent window beams arranged between the first ring beam and the second ring beam, and a pocket for mounting a rotating body is surrounded between the first ring beam, the second ring beam and the adjacent two bent window beams; the bent window beam comprises a bent part and a first part and a second part symmetrically arranged at both ends of the bent part, and the side of the first ring beam and the second ring beam facing the pocket is provided with a first oil groove;

[0009] The first part and the second part are provided with a first pressing slope surface on a side facing the pocket, the bending part comprises a straight line segment and bending segments at both ends of the straight line segment, the bending segments are provided with a second pressing slope surface on a side facing the pocket, the straight line segment is further provided with an oil passing inclined surface on a side facing the pocket, the oil passing inclined surface has an oil passing gap with the rotating body, and the bending segments have an arc bending structure.

[0010] As a preferred embodiment of the present application, the first ring beam and the second ring beam are provided with one or more second oil passing grooves on a side away from the pocket.

[0011] As a preferred embodiment of the present application, the bending segments are provided with a first arc transition surface on a side facing the pocket, and are provided with a second arc transition surface on a side inside and a side away from the inside of the welded bearing retainer.

[0012] As a preferred embodiment of the present application, the first part is provided with a first matching part near one end of the first ring beam, the second part is provided with a second matching part near one end of the second ring beam, and the first matching part and the second matching part have a shape adapted to the shape of the end of the rotating body.

[0013] As a preferred embodiment of the present application, in the radial direction, the projection surface width of the bending part is not greater than the projection surface width of the first part and the second part.

[0014] As a preferred embodiment of the present application, the first pressing slope surface has a first contact area for contact matching with the rotating body, the second pressing slope surface has a second contact area for contact matching with the rotating body, and the second contact area is smaller than the first contact area.

[0015] As a preferred embodiment of the present application, the first pressing slope surface and the second pressing slope surface are provided with a wear-resistant layer.

[0016] As a preferred embodiment of the present application, the first ring beam and the second ring beam are provided with a wear-resistant layer on a side facing the pocket.

[0017] As a preferred embodiment of the present application, in the radial direction, the bending window beam protrudes towards the inside of the retainer or the bending window beam protrudes towards the outside of the retainer.

[0018] As a preferred embodiment of the present application, the first ring beam and the second ring beam are provided with a ring groove and a plurality of axial transition grooves connected with the ring groove on the side facing the inside of the welded bearing retainer, and the axial transition grooves are arranged correspondingly to the pockets; one end of the axial transition groove is in communication with the ring groove, and the other end is in communication with the pocket or the first oil passing groove.

[0019] Due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0020] 1. Compared with the traditional retainer, the friction contact area between the rotating body and the retainer is greatly reduced. The arrangement of the first oil passing groove, the second oil passing groove, the oil passing slope, the ring groove and the axial transition groove enables the lubricating grease to flow smoothly between the rotating body, the pocket and the inner and outer rings of the bearing, thereby reducing the friction between the rotating body, the retainer and the inner and outer rings of the bearing. This is conducive to reducing the wear of the rotating body and the retainer, prolonging the service life of the rotating body and the retainer, reducing the irregular movement of the rotating body and the retainer during the rotation of the bearing, keeping the rotating path of the rotating body stable to ensure the stability of the shaft rotation, and reducing the noise generated during the rotation of the bearing. Moreover, the above structure can realize the weight reduction of the retainer, thereby reducing the impact load between the retainer, the rotating body and the inner and outer rings of the bearing during the use of the bearing, and improving the durability and safety of the entire bearing structure.

[0021] 2. The oil passing gap between the oil passing slope and the rotating body presents an opening structure design that the opening on the side facing the inside of the retainer is large and the opening on the side facing away from the inside of the retainer is small. This arrangement not only meets the lubricating grease flow requirement, but also maximizes the concentration of lubricating grease inside the retainer to improve the utilization rate of lubricating grease, thereby ensuring the lubrication effect and reducing the loss of lubricating grease. Moreover, this arrangement is also conducive to ensuring the structural strength of the bending window beam middle bending part, and further ensuring the support and limiting effect of the retainer on the rotating body.

[0022] 3. The welded bearing retainer structure in the present application can improve the flowability of lubricating grease between the rotating body, the retainer, the inner and outer rings of the bearing, thereby improving the lubrication effect of the retainer, reducing the friction loss of the rotating body, the retainer, the inner and outer rings of the bearing and the lubricating grease, and improving the durability and safety of the rotating body, the retainer and the entire bearing structure.

[0023] 4. In the above scheme, by setting the first oil groove and the second oil groove, the auxiliary positioning function can be played in the early stamping process of welding the holder, which facilitates continuous processing, thereby reducing the error caused by multiple clamping and positioning, and is beneficial to improve the stamping precision and processing efficiency. At the same time, the first oil groove and the second oil groove can also play an auxiliary positioning role in the subsequent roll welding process, which is beneficial to ensure the roundness of the roll forming of the holder and the welding precision and welding quality, and ultimately is beneficial to improve the structural strength of the entire welded holder. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are intended to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 is a structural schematic diagram of a welded bearing holder in an example;

[0026] Figure 2 is a structural schematic diagram of a rotating body and a welded bearing holder in an example; Figure 1 is an enlarged structural schematic diagram of part A in the example;

[0027] Figure 3 is a structural schematic diagram of a rotating body and a welded bearing holder in an example;

[0028] Figure 4 is an enlarged structural schematic diagram of part B in the example; Figure 3

[0029] is a structural schematic diagram of a welded bearing holder in another example; Figure 5

[0030] is a structural schematic diagram of a welded bearing holder in another example. Figure 6 List of components and reference numerals:

[0031] 11 first ring beam, 12 second ring beam, 13 first oil groove, 14 pocket hole, 15 ring groove, 16 axial transition groove, 17 second oil groove;

[0032] 2 bent window beam, 21 bent part, 211 straight section, 2111 oil groove inclined surface, 212 bent section, 2121 second pressure slope surface, 2122 first arc transition surface, 2123 second arc transition surface, 22 first part, 221 first matching part, 23 second part, 231 second matching part, 24 first pressure slope surface, 25 oil gap;

[0033] 3 rotating body.

[0034] DETAILED DESCRIPTION

[0035] ​In order to make the overall idea of the present application clearer, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0036] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details. In other instances, well-known methods have not been described in detail in order not to unnecessarily obscure aspects of the present application. It is to be understood that other implementations can be utilized and that structural and functional modifications can be made without departing from the scope of the present application. Therefore, the foregoing description is not intended to be limiting. The embodiments of the present application can be combined with each other and with features of the embodiments unless otherwise explicitly stated.

[0037] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like mean the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Referring to Figures 1-5 As shown in the drawings, the present application discloses a kind of welded bearing cage, it mainly includes first ring beam 11, second ring beam 12 and the plurality of bending window beam 2 between first ring beam 11 and second ring beam 12, two adjacent bending window beam 2 and first ring beam 11 and second ring beam 12 are surrounded with the pocket hole 14 for installing rotating body 3.Continue to refer toFigure 2 As shown, the bent window beam 2 comprises a bent portion 21 and a first portion 22 and a second portion 23 symmetrically arranged at both ends of the bent portion 21, the first portion 22 is connected with the first ring beam 11, and the first ring beam and the second ring beam are provided with the first oil passing groove on the side facing the pocket hole. Preferably, the second portion 23 is connected with the second ring beam 12, and the first ring beam 11 and the second ring beam 12 are provided with the first oil passing groove 13 at the connection position of the first portion 22 and the second portion 23, and the first portion 22 and the second portion 23 are provided with the first pressure slope surface 24 on the side facing the pocket hole 14, which is in contact with the rotating body 3. The bent portion 21 is provided with the second pressure slope surface 2121 on the side facing the pocket hole 14, which is in contact with the rotating body 3. The bent portion 21 is also provided with the oil passing inclined surface 2111 on the side facing the pocket hole 14, and the oil passing inclined surface 2111 has the oil passing gap 25 with the rotating body 3.

[0041] In the above scheme, when the rotating body 3 is installed into the pocket hole 14, the side surface of the rotating body 3 is in contact with the first pressure slope surface 24 and the second pressure slope surface 2121, and only the first pressure slope surface 24, the second pressure slope surface 2121, and the first ring beam 11 and the second ring beam 12 are in friction when the rotating body 3 rotates. Compared with the traditional retainer, the friction contact area between the rotating body 3 and the retainer is greatly reduced. The first oil passing groove 13, the second oil passing groove 17, and the oil passing inclined surface 2111 are arranged to enable the lubricating grease to flow smoothly between the rotating body 3, the pocket hole 14, and the inner and outer rings of the bearing, thereby reducing the friction between the rotating body 3, the retainer, and the inner and outer rings of the bearing. This is conducive to reducing the wear of the rotating body 3 and the retainer, prolonging the service life of the rotating body 3 and the retainer, reducing the irregular movement of the rotating body 3 and the retainer during the rotation of the bearing, keeping the rotating path of the rotating body 3 stable to ensure the stability of the shaft rotation, and reducing the noise generated during the rotation of the bearing.

[0042] In addition, the above structure can better adapt to the optimization of the welding bearing retainer process. In the existing welding bearing retainer processing process, stamping processing of the window hole, the window beam, and the round welding are usually required to complete the processing of a complete retainer. The first oil passing groove 13 and the second oil passing groove 17 can assist in positioning during the stamping processing before the retainer is welded, which facilitates single clamping and continuous processing in the early stamping processing process through a continuous die, thereby improving the precision and efficiency of the stamping processing. The second oil passing groove 17 can also assist in positioning during the round welding of the retainer, which is conducive to ensuring the roundness of the retainer and the welding quality, and ultimately improving the structural strength of the welded bearing retainer.

[0043] In one example, with reference to Figure 2 and Figure 4As shown, the bending portion 21 comprises a straight section 211 and bending sections 212 at both ends of the straight section 211, and the bending sections 212 have arc-shaped bending structures. As a preferred embodiment of the present application, continuing to refer to Figure 2 and Figure 4 As shown, the bending sections 212 are provided with first arc-shaped transition surfaces 2122 at the connection with the first portion 22 and the second portion 23 towards the side of the pocket 14, and are provided with second arc-shaped transition surfaces 2123 towards the inside of the bearing retainer and away from the inside of the bearing retainer. This arrangement can play a role in dispersing stress and avoiding stress concentration in the bending sections 212 to cause stress damage.

[0044] Continuing to refer to Figure 2 and Figure 4 As shown, the bending sections 212 are provided with the aforementioned second pressure slope surfaces 2121 towards the side of the pocket 14, and the straight sections 211 are provided with the aforementioned oil passing inclined surfaces 2111 towards the side of the pocket 14. As a preferred embodiment of the present application, continuing to refer to Figure 4 As shown, the oil passing gap 25 between the oil passing inclined surface 2111 and the rotating body 3 has a structure design that the opening towards the inside of the retainer is larger and the opening away from the inside of the retainer is smaller. This arrangement can meet the needs of lubricating grease flow while maximizing the concentration of lubricating grease inside the retainer to improve the utilization rate of lubricating grease, which can ensure lubrication effect and reduce lubricating grease loss, and this arrangement is also beneficial to ensuring the structural strength of the middle bending portion 21 of the bending window beam 2 and further ensuring the support and limiting effect of the retainer on the rotating body 3. It should be noted that the above-mentioned oil passing inclined surface 2111 and the arrangement of the oil passing inclined surface 2111 are only a preferred embodiment of the present application, and the structure arrangement of the side of the bending portion 21 towards the pocket 14 is not limited to the above-mentioned manner. It can also continue to be provided with a first oil passing groove 13, an oil passing hole or other more different structure arrangements, which are not limited in the present application.

[0045] In addition, it should be noted that the bending direction of the bending window beam 2 is not limited in the present application, which can be bent towards the inside of the retainer as in the above-mentioned example, or can be bent towards the outside of the retainer for cooperation with the inner and outer sleeves of the bearing, i.e. the bending portion 21 can protrude towards the inside of the retainer or protrude towards the outside of the retainer. This arrangement can meet the needs of different specifications of bearings and improve the universality of the welded bearing retainer in the present application.

[0046] Continuing to refer to Figure 2 and Figure 4As shown, the first part 22 is provided with a first matching part 221 near one end of the first ring beam 11, and the second part 23 is provided with a second matching part 231 near one end of the second ring beam 12, and the first matching part 221 and the second matching part 231 have shapes suitable for the shape of the end of the rotating body 3. With this arrangement, the retaining effect of the pocket hole 14 on the rotating body 3 can be effectively improved, and the unstable movement of the rotating body 3 during rotation can be reduced. Meanwhile, referring to Figure 2 and Figure 4 As shown, preferably, the first matching part 221 and the second matching part 231 adopt an arc-shaped structure, that is, the connection between the first pressure slope surface 24 and the first ring beam 11 and the second ring beam 12 adopts an arc-shaped transition. With this arrangement, the need of the pocket hole 14 for limiting the rotating body 3 can be met, and stress concentration at the connection between the first part 22, the second part 23 and the first ring beam 11 and the second ring beam 12 caused by the first pressure slope surface 24 can be avoided, which is conducive to ensuring the structural strength of the entire retainer. It should be noted here that the structure and arrangement of the first matching part 221 and the second matching part 231 are only an example of the present application, and the arrangement of the first matching part 221 and the second matching part 231 in the present application is not limited to the above example, and the present application does not make specific limitations in this regard.

[0047] As a preferred embodiment of the present application, referring to Figures 1-4As shown, the projection surface width of the bending portion 21 is less than that of the first portion 22 and the second portion 23 along the radial direction of the welded bearing retainer in the present application. And the length of each of the first portion 22 and the second portion 23 is not greater than one fifth of the total length of the bending window beam 2 along the axial direction of the welded bearing retainer in the present application. Such arrangement is conducive to ensuring the connection strength between the bending window beam 2 and the first ring beam 11 and the second ring beam 12, thereby ensuring the stability of the entire retainer structure, and further ensuring the stability of the rotating path of the rotating body 3 and the long-term stable operation of the bearing. The first pressure slope surface 24 has a first contact area in contact with the rotating body 3, and the second pressure slope surface 2121 has a second contact area in contact with the rotating body 3, and the second contact area is less than the first contact area. Such arrangement makes the contact area between the most easily abraded position near the middle of the rotating body 3 and the bending portion 21 as small as possible, which can not only ensure sufficient limiting support for the rotating body 3 but also reasonably distribute the contact area while reducing the friction contact area, so as to reduce the torque of the rotating body 3 in rotation and enable stable operation, thereby further prolonging the service life of the retainer. Preferably, the first pressure slope surface 24, the second pressure slope surface 2121, and the side of the first ring beam 11 and the second ring beam 12 facing the pocket hole 14 are provided with a wear-resistant layer. The wear-resistant layer further improves the wear resistance of the contact position of the retainer and the rotating body 3 and reduces abrasion. It should be noted here that the above is only some preferred embodiments of the present application, and the structure of the bending portion 21, the first pressure slope surface 24, the second pressure slope surface 2121, and the surface treatment of the side of the first ring beam 11 and the second ring beam 12 facing the pocket hole 14 in the present application are not limited to the above embodiments, and the present application does not make specific limitations thereon. In addition, the material and arrangement of the above wear-resistant layer are also not specifically limited, which can be formed by electroplating, plastic dipping, laser cladding, etc. using polyether ether ketone, ceramic, and other non-metallic materials and alloy materials, or other more different arrangements.

[0048] As a preferred embodiment of the present application, referring to Figure 6 As shown, the side of the first ring beam 11 and the second ring beam 12 away from the pocket hole 14 is provided with one or more second oil passing grooves 17. Preferably, a plurality of second oil passing grooves 17 are uniformly and spaced arranged around the circumference of the first ring beam 11 and the second ring beam 12, and the opening size of the second oil passing groove 17 is preferably smaller than that of the first oil passing groove 13. Continuing to refer to Figure 5As shown, the first ring beam and the second ring beam are provided with a ring groove 15 and a plurality of axial transition grooves 16 connected with the ring groove on the side facing the inside of the welded bearing retainer, the axial transition grooves 16 are provided correspondingly with the pockets 14; one end of the axial transition groove 16 is in communication with the ring groove 15, and the other end is in communication with the pocket 14 or the first oil passage 13. The setting of the second oil passage 17, the ring groove and the axial transition groove is more conducive to the flow of lubricating grease, thereby facilitating the further improvement of the lubrication effect of the welded bearing retainer structure in the present application, and the setting of the above structure can play a role in reducing the weight of the material.

[0049] In summary, by adopting the welded bearing retainer structure in the present application, the flowability of the lubricating grease between the rotating body 3, the retainer, the inner and outer rings of the bearing can be improved, thereby improving the lubrication effect of the retainer, reducing the friction loss of the rotating body 3, the retainer, the inner and outer rings of the bearing and the lubricating grease, and effectively playing a role in reducing the weight of the material, further reducing the impact loss between parts during the use of the bearing, and improving the durability and safety of the rotating body 3, the retainer and the entire bearing structure.

[0050] The places not described in the present application can be realized by adopting or referring to the existing technology.

[0051] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. The above is only the embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A welded bearing cage characterized in that, The first ring beam, the second ring beam and the plurality of bent window beams arranged between the first ring beam and the second ring beam, two adjacent bent window beams and the first ring beam and the second ring beam are surrounded by a pocket hole for mounting a rotating body; the bent window beam comprises a bent portion and a first portion and a second portion symmetrically arranged at both ends of the bent portion, and the first ring beam and the second ring beam are provided with a first oil groove on the side facing the pocket hole; The first portion and the second portion are provided with a first pressure slope surface on the side facing the pocket hole, the bent portion comprises a straight line segment and a bent segment at both ends of the straight line segment, the bent segment is provided with a second pressure slope surface on the side facing the pocket hole, and the straight line segment is also provided with an oil passing inclined surface on the side facing the pocket hole, the oil passing inclined surface has an oil passing gap with the rotating body, and the bent segment has an arc bending structure; The first ring beam and the second ring beam are provided with one or more second oil grooves away from the pocket hole; the first ring beam and the second ring beam are provided with a ring groove and a plurality of axial transition grooves connected with the ring groove on the side facing the inside of the welded bearing retainer, and the axial transition grooves are arranged correspondingly to the pocket hole; one end of the axial transition groove is in communication with the ring groove, and the other end is in communication with the pocket hole or the first oil groove; the bent segment is provided with a first arc transition surface on the side facing the pocket hole.

2. The welded bearing cage of claim 1, wherein, The bent segment is provided with a second arc transition surface on the side facing the inside of the welded bearing retainer and the side away from the inside of the welded bearing retainer.

3. The welded bearing retainer of claim 1, wherein, The first portion is provided with a first matching part at one end close to the first ring beam, and the second portion is provided with a second matching part at one end close to the second ring beam, and the first matching part and the second matching part have a shape suitable for the shape of the end of the rotating body.

4. The welded bearing retainer of claim 1, wherein, In the radial direction, the projection area width of the bent portion is not greater than the projection area width of the first portion and the second portion.

5. The welded bearing retainer of claim 1, wherein, The first pressure slope surface has a first contact area for contact with the rotating body, and the second pressure slope surface has a second contact area for contact with the rotating body, and the second contact area is smaller than the first contact area.

6. The welded bearing retainer of claim 1, wherein, The first pressure slope surface and the second pressure slope surface are provided with a wear-resistant layer.

7. The welded bearing retainer of claim 1, wherein, The first ring beam and the second ring beam are provided with a wear-resistant layer on the side facing the pocket hole.

8. The welded bearing retainer of claim 1, wherein, In the radial direction, the bent window beam protrudes towards the inside of the retainer or the bent window beam protrudes towards the outside of the retainer.

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