CN215697120U - Bearing flanging device - Google Patents

Abstract

The application relates to the technical field of bearing processing, in particular to a bearing flanging device. The bearing flanging device comprises a positioning shaft, a rolling component and a pressure regulating component; the positioning shaft penetrates through a center hole of the bearing, the rolling component and the pressure regulating component are respectively arranged at two ends of the positioning shaft so as to clamp the bearing, and the pressure regulating component can move back and forth or rotate on the positioning shaft; by moving the pressure regulating assembly, the rolling pressure applied to the bearing by the rolling assembly can be regulated. And rotating the positioning shaft, wherein the positioning shaft rotates relative to the pressure regulating assembly and drives the rolling assembly to synchronously rotate along with the pressure regulating assembly, so that the rolling assembly rolls the outer side wall of the flanging groove of the bearing at a preset pressure to finish the flanging treatment of the bearing. Therefore, the bearing flanging device can adjust the rolling pressure applied to the bearing without being connected with external pressure equipment, so that the rolling assembly can roll and flange the bearing; and the whole structure of the equipment is small, and the device is suitable for flanging the bearing with narrow operation space.

Description

Bearing flanging device

Technical Field

The application relates to the technical field of bearing processing, in particular to a bearing flanging device.

Background

According to the technical requirements of mounting the bearing on the part, after the bearing is pressed into a bearing hole of the part, the edge of the bearing needs to be flanged, so that the bearing can be limited to move along the axial direction. The existing bearing flanging device needs to be connected with external auxiliary equipment when flanging the bearing so as to apply pressure to the bearing through the auxiliary equipment, so that a larger operation space is needed; for some parts with smaller operation space, the existing bearing flanging device can not independently complete the flanging of the bearing.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bearing flanging device, which can independently complete the pressing and flanging treatment of a bearing.

The utility model provides a bearing flanging device which comprises a positioning shaft, a rolling assembly and a pressure regulating assembly, wherein the positioning shaft is arranged on the rolling assembly; the positioning shaft is used for penetrating through a center hole of a bearing to be flanged, the rolling component is connected with one end of the positioning shaft, and the rolling component can abut against a flanging groove of the bearing; the pressure regulating assembly is movably connected to the other end of the positioning shaft and can move along the positioning shaft, so that the bearing is clamped between the rolling assembly and the pressure regulating assembly at a preset pressure; the pressure regulating assembly can be relative the location axle rotates, just the rotation of location axle can drive rolling press assembly rotates, with through rolling press assembly is right the bearing carries out the turn-ups and handles.

Further, the pressure regulating assembly comprises a positioning support and a locking piece; the positioning support and the locking piece are coaxially arranged and are in rotating connection; the positioning support and the locking piece are sleeved on the positioning shaft, and the positioning support can abut against the bearing; the retaining member is movably connected to the positioning shaft so that the retaining member can move along the length of the positioning shaft.

Furthermore, be provided with first external screw thread connecting portion on the location axle, the retaining member seted up with the first internal thread through-hole of first external screw thread connecting portion looks adaptation, so that the retaining member spiro union in the location axle.

Furthermore, one end of the positioning support body, which faces the bearing, surrounds the positioning shaft and is provided with a first annular boss, and the first annular boss can be inserted between the positioning shaft and the inner ring of the bearing in a clearance fit manner to form an annular gap.

Further, one end, facing the bearing, of the positioning support body is provided with a second annular boss surrounding the first annular boss; the first annular boss and the second annular boss form an avoiding groove therebetween, the second annular boss can abut against the outer ring of the bearing, and the inner ring of the bearing extends into the avoiding groove.

Further, the rolling assembly comprises a rolling support body, a roller and a rolling frame; the rolling support body is sleeved and connected with the positioning shaft, and an annular groove is formed in the end face of one side, facing the bearing, of the rolling support body of the rolling frame; the roller is installed in the annular groove through the rolling frame, a flanging closed angle is formed at one end, facing the bearing, of the roller, and the flanging closed angle extends into the flanging groove and abuts against the outer side wall of the flanging groove.

Further, the number of the rollers is multiple, and the rollers are distributed at intervals on the circumference.

Furthermore, a positioning bushing is further sleeved on the positioning shaft on one side of the rolling frame facing the bearing; the positioning bush can be inserted between the positioning shaft and the inner ring of the bearing in a clearance fit mode to form an annular gap; and the side wall of the positioning shaft is clamped with a check ring, and two ends of the bushing are respectively abutted against the check ring and the rolling frame.

Furthermore, a second external thread connecting part is arranged at one end of the positioning shaft, which is used for being connected with the rolling support body, and a second internal thread through hole matched with the second external thread connecting part is formed in the rolling support body, so that the positioning shaft is in threaded connection with the rolling support body.

Further, the roller is a solid cylinder, and the axis of the roller and the axis of the positioning shaft form a preset inclination angle; the cylindrical end face of the roller, which is contacted with the annular groove, is a spherical cambered surface.

Compared with the prior art, the utility model has the beneficial effects that:

the bearing flanging device provided by the utility model comprises a positioning shaft, a rolling component and a pressure regulating component; one end of the positioning shaft can penetrate through a center hole of the bearing to be flanged, the rolling assembly is fixedly installed at one end of the positioning shaft in the length direction, and the pressure regulating assembly is movably arranged at the other end of the positioning shaft in the length direction, so that the pressure regulating assembly can move on the positioning shaft in the length direction of the positioning shaft or rotate relative to the positioning shaft. When carrying out the centre gripping through rolling subassembly and pressure regulating subassembly to the bearing, the accessible removes the length direction that the pressure regulating subassembly made the pressure regulating subassembly along the location axle and removes to adjust the clamp force of rolling subassembly and pressure regulating subassembly to the bearing, apply the rolling pressure in the bearing to rolling subassembly promptly and adjust. Specifically, the pressure regulating assembly moves towards the direction close to the rolling assembly, and the pressure applied to the bearing by the rolling assembly is increased; the pressure regulating assembly is moved away from the rolling assembly, and the pressure applied to the bearing by the rolling assembly is reduced.

After the adjustment of the rolling pressure is completed, the pressure regulating assembly is kept still, the positioning shaft is rotated, the positioning shaft rotates relative to the pressure regulating assembly and drives the rolling assembly to synchronously rotate along with the positioning shaft, so that the rolling assembly rolls the outer side wall of the flanging groove of the bearing at a preset pressure, and the flanging treatment of the bearing is completed. Therefore, the bearing flanging device is not required to be connected with external pressure equipment, the rolling pressure applied to the bearing can be adjusted only by adjusting the installation position of the pressure adjusting assembly on the positioning shaft, and the flanging treatment of the bearing is completed under the rolling of the rolling assembly; and the whole structure of the equipment is small, and the device is suitable for flanging the bearing with narrow operation space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic cross-sectional view of a bearing flanging device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a voltage regulating assembly according to an embodiment of the present invention;

figure 3 is a schematic structural view of a positioning shaft and a rolling assembly provided by an embodiment of the present invention.

Reference numerals:

1-a positioning shaft, 11-a first external thread connecting part, 12-a second external thread connecting part and 13-an external hexagonal operation part;

2-a pressure regulating assembly, 21-a positioning support, 22-a locking piece, 23-a first annular boss, 24-a second annular boss, 25-an avoidance groove, 26-a flat pressure bearing, 27-an outer hexagonal pipe section and 28-a first internal thread through hole;

3-rolling component, 31-rolling support, 32-roller, 33-rolling frame, 34-lining, 35-check ring, 36-annular groove;

4-bearing, 41-inner ring, 42-outer ring, 43-flanging groove.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Bearing turnups in accordance with some embodiments of the present application are described below with reference to fig. 1-3.

The application provides a bearing 4 flanging device, as shown in figure 1, the bearing 4 flanging device comprises a positioning shaft 1, a rolling assembly 3 and a pressure regulating assembly 2; the bearing 4 can be passed through the centre bore of the bearing 4 of waiting to turn-ups processing to the one end of location axle 1, and rolling component 3 and pressure regulating component 2 set up relatively, and rolling component 3 and pressure regulating component 2 can install respectively in the length direction's of location axle 1 both ends for bearing 4 is held between rolling component 3 and pressure regulating component 2, and rolling component 3 and bearing 4 wait that the lateral wall of turn-ups groove 43 of turn-ups processing offsets and lean on.

Wherein, rolling press subassembly 3 fixed mounting is in the one end of the length direction of location axle 1, and the voltage regulating subassembly 2 is movably set up in the other end of the length direction of location axle 1 for voltage regulating subassembly 2 can move or fix a position axle 1 rotation relatively along the length direction of location axle 1 on location axle 1.

When carrying out the centre gripping through rolling subassembly 3 and pressure regulating subassembly 2 to bearing 4, the accessible removes pressure regulating subassembly 2 and makes pressure regulating subassembly 2 move along the length direction of location axle 1 to adjust the clamp force of rolling subassembly 3 and pressure regulating subassembly 2 to bearing 4, adjust the rolling pressure that rolling subassembly 3 applyed in bearing 4 promptly. Specifically, the pressure regulating assembly 2 is moved towards the direction close to the rolling assembly 3, and the pressure applied to the bearing 4 by the rolling assembly 3 is increased; the pressure regulating assembly 2 is moved away from the rolling assembly 3, and the pressure applied to the bearing 4 by the rolling assembly 3 is reduced.

After the adjustment of the rolling pressure is completed, the pressure regulating assembly 2 is kept still, the positioning shaft 1 is rotated, the positioning shaft 1 rotates relative to the pressure regulating assembly 2, and the rolling assembly 3 is driven to synchronously rotate along with the positioning shaft, so that the rolling assembly 3 rolls the outer side wall of the flanging groove 43 of the bearing 4 at a preset pressure, and the flanging treatment of the bearing 4 is completed.

Therefore, the flanging device of the bearing 4 is not required to be connected with external pressure equipment, the rolling pressure applied to the bearing 4 can be adjusted by only adjusting the installation position of the pressure regulating assembly 2 on the positioning shaft 1, and the flanging treatment of the bearing 4 is completed under the rolling of the rolling assembly 3; and the whole structure of the equipment is small, and the device is suitable for flanging the bearing 4 with narrow operation space.

Regarding the structure of the pressure regulating assembly 2, in one embodiment of the present application, preferably, as shown in fig. 1 and 2, the pressure regulating assembly 2 includes a positioning support 21 and a locking member 22; the positioning support body 21 is sleeved on the positioning shaft 1, and one end of the positioning support body 21 in the axial direction can be abutted against the end part of the bearing 4, so that the positioning support body 21 can be matched with the rolling component 3 to clamp the bearing 4; retaining member 22 and location support 21 coaxial setting are connected, and the movably connection of retaining member 22 is on location axle 1, and retaining member 22 can move along the length direction of location axle 1 to drive location support 21 and move along the length direction of location axle 1, adjust the rolling pressure that the bearing 4 received.

In this embodiment, preferably, as shown in fig. 2, the locking member 22 is provided with a first internal threaded through hole 28 penetrating through the locking member 22 along the axis thereof, the outer wall of the positioning shaft 1 is provided with a first external threaded connecting portion 11, and the first external threaded connecting portion 11 is adapted to the first internal threaded through hole 28, so that the locking member 22 can be screwed on the positioning shaft 1; rotate retaining member 22 or rotate location axle 1 and make and take place relative rotation between retaining member 22 and the location axle 1, can make retaining member 22 remove along the length direction of location axle 1 through the screw drive between retaining member 22 and the location axle 1 to drive the location and prop up body 21 and remove along the length direction of location axle 1, make the location prop up body 21 and be close to or keep away from bearing 4, and then realize the regulation to the rolling pressure that bearing 4 received.

Preferably, as shown in fig. 2, one end of the locking member 22 away from the bearing 4 protrudes out of the positioning support 21, and a portion of the locking member 22 outside the positioning support 21 is provided with an external hexagonal pipe section 27 so that the locking member 22 can be screwed by an open end wrench or a torque wrench or the like.

Preferably, the positioning shaft 1 is provided with a length scale, and the installation position of the locking member 22 on the positioning shaft 1 can be read through the length scale on the positioning shaft 1, so as to obtain the distance between the positioning support 21 and the rolling assembly 3, and further obtain the rolling pressure applied to the bearing 4.

In this embodiment, as shown in fig. 2, the positioning support 21 and the locking member 22 are preferably connected by a flat bearing 26, so that the positioning support 21 and the locking member 22 can rotate relatively. When carrying out the roll extrusion turn-ups to bearing 4, fix location support body 21, it is fixed that concrete accessible open-end wrench carries out the centre gripping to location axle 1 support, then rotates location axle 1, installs retaining member 22 and rolling component 3 on location axle 1 and rotates along with location axle 1 to the completion is to the roll extrusion turn-ups of bearing 4.

In one embodiment of the present application, preferably, as shown in fig. 1 and 2, the through diameter of the positioning shaft 1 is smaller than the through diameter of the central hole of the bearing 4, so that an annular gap is formed between the positioning shaft 1 and the central hole of the bearing 4; in order to ensure that the positioning shaft 1 is coaxial with the bearing 4, the positioning support body 21 is provided with a first annular boss 23 surrounding the positioning shaft 1 on the end face of one end of the bearing 4, the first annular boss 23 can be inserted into an annular gap between the positioning shaft 1 and the bearing 4 in a clearance fit manner, so that the bearing 4 is radially positioned, the bearing 4 cannot rock along the radial direction, and then the rolling component 3, specifically, the roller 32 mentioned below, can be accurately pressed on the outer side wall of the flanging groove 43 of the bearing 4, so that the flanging treatment of the bearing 4 is completed, and the flanging quality is ensured.

In this embodiment, preferably, as shown in fig. 1 and fig. 2, the bearing 4 includes an inner ring 41 and an outer ring 42 which are sleeved together, the central hole of the bearing 4 is the central hole of the inner ring 41, a flanging groove 43 is formed on the end surface of the outer ring 42, when the bearing 4 is clamped, the rolling assembly 3 is pressed against the flanging groove 43 on the end surface of one end of the outer ring 42 through the rollers 32, and the positioning support 21 abuts against the other end of the outer ring 42; however, the end of the inner ring 41 protrudes from the outer ring 42 by a predetermined height, and in order to allow the position supporter 21 to be pressed against the end surface of the outer ring 42, the end surface of the position supporter 21 facing one end of the bearing 4 is provided with a second annular projection 24 around the first annular projection 23 to form an escape groove 25 between the second annular projection 24 and the first annular projection 23, the escape groove 25 has a predetermined depth so that the inner ring 41 of the bearing 4 can protrude into the escape groove 25, and the second annular projection 24 can be pressed against the end surface of the outer ring 42 of the bearing 4.

Therefore, through set up first annular boss 23 and second annular boss 24 on location support body 21, can rely on second annular boss 24 to carry out axial direction's spacing and compress tightly bearing 4, rely on first annular boss 23 to carry out radial direction's spacing to bearing 4 to guarantee going on smoothly of bearing 4 turn-ups processing.

Regarding the structure of the rolling assembly 3, in one embodiment of the present application, preferably, as shown in fig. 1 and 3, the rolling assembly 3 includes rollers 32, rolling supports 31, and rolling frames 33; the rolling support 31 is coaxial with the positioning shaft 1 and is connected with the positioning shaft 1, so that the rolling support 31 can synchronously rotate along with the positioning shaft 1; one end of the rolling support 31 facing the bearing 4 is provided with an annular groove 36 around the positioning shaft 1, and the roller 32 is installed in the annular groove 36 of the rolling support 31 through the rolling frame 33, so that the roller 32 can synchronously rotate the rolling support 31.

The roller 32 is opposite to the flanging groove 43 of the bearing 4, and one side of the roller 32 facing the bearing 4 forms a flanging sharp corner which can extend into the flanging groove 43 and be pressed against the side wall of the flanging groove 43. The position of the positioning support body 21 of the pressure regulating assembly 2 is adjusted to enable the flanging sharp corner to be pressed on the side wall of the flanging groove 43 with preset pressure, then the positioning shaft 1 and the rolling assembly 3 are rotated, the roller 32 rolls the outer side wall of the flanging groove 43, and the flanging treatment of the bearing 4 is completed.

In this embodiment, the number of the rollers 32 is preferably plural, and the plural rollers 32 are circumferentially spaced in the annular groove 36 of the rolling support. By providing a plurality of rollers 32, the roll-on-roll assembly 3 can be pressed stably against the side walls of the flanging groove 43 and the roll-flanging of the bearing 4 can be completed quickly.

Preferably, the number of rollers 32 is 3.

In this embodiment, preferably, as shown in fig. 3, the roller 32 is a solid cylinder, and the annular groove 36 on the rolling support 31 is a right-angled V-shape with a predetermined inclination angle, that is, the side wall of the V-shaped annular groove 36 is at a predetermined inclination angle with respect to the axis of the rolling support 31; the axis of the roller 32 installed in the annular groove 36 is also at a predetermined inclination angle with the axis of the rolling support 31, so that the corner of one end of the roller 32 in the axial direction is inserted into the V-row aligning annular groove 36, the corner of the other end of the roller 32 in the axial direction is a flanging sharp corner, the flanging sharp corner faces the flanging groove 43 of the bearing 4 and extends into the flanging groove 43, and the side wall of the roller 32 is pressed against the outer side wall of the flanging groove 43 to roll the same.

Preferably, as shown in fig. 3, the end surface of the roller 32 at one end of the annular groove 36 is a spherical arc surface, and the roller 32 abuts against the side wall of the annular groove 36 through the spherical arc surface, so as to ensure the flexibility of rotation of the roller 32.

In one embodiment of the present application, preferably, as shown in fig. 1 and 3, the rolling support 31 is in threaded connection with the positioning shaft 1; a step mounting hole is formed in the rolling support 31 along the axis of the rolling support, a first pore passage with a smaller diameter is formed in one side of the step mounting hole, which faces the bearing 4, and a second internal thread through hole with a larger diameter is formed in one side of the step mounting hole, which is far away from the bearing 4; the rolling support body 31 can be sleeved on the positioning shaft 1 through the first pore passage in a clearance fit manner, the positioning shaft 1 is provided with a second external thread connecting part 12, the second external thread connecting part 12 is matched with the second internal thread through hole, so that the positioning shaft 1 can be in threaded connection with the rolling support body 31, and the end part of the second external thread connecting part 12 is abutted against the step surface between the second internal thread through hole and the first through hole.

Preferably, as shown in fig. 3, the positioning shaft 1 is provided with an external hexagonal operation portion 13, and an operator can be clamped on the external hexagonal operation portion 13 by a wrench or other auxiliary equipment to rotate the positioning shaft 1.

In one embodiment of the present application, preferably, as shown in fig. 1 and 3, the rolling assembly 3 further includes a bushing 34 and a retainer ring 35, the retainer ring 35 is clamped on the side wall of the positioning shaft 1, the bushing 34 is installed between the retainer ring 35 and the roller frame 33, and two ends of the bushing 34 respectively abut against the roller frame 33 and the retainer ring 35. The bush 34 is matched with an annular gap between the positioning shaft 1 and a central hole of the bearing 4, so that the bush 34 can be inserted into the annular gap in a clearance fit mode, the bearing 4 is positioned radially through the bush 34 and the first annular boss 23 arranged on the positioning support body 21, and the bearing 4 is prevented from deviating in the rolling and flanging process to influence the flanging quality.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A bearing flanging device is characterized by comprising a positioning shaft, a rolling component and a pressure regulating component;

the positioning shaft is used for penetrating through a center hole of a bearing to be flanged, the rolling component is connected with one end of the positioning shaft, and the rolling component can abut against a flanging groove of the bearing;

the pressure regulating assembly is movably connected to the other end of the positioning shaft and can move along the positioning shaft, so that the bearing is clamped between the rolling assembly and the pressure regulating assembly at a preset pressure;

the pressure regulating assembly can be relative the location axle rotates, just the rotation of location axle can drive rolling press assembly rotates, with through rolling press assembly is right the bearing carries out the turn-ups and handles.

2. The bearing turnup of claim 1, wherein the pressure adjustment assembly comprises a positioning support and a retaining member;

the positioning support and the locking piece are coaxially arranged and are in rotating connection;

the positioning support and the locking piece are sleeved on the positioning shaft, and the positioning support can abut against the bearing;

the retaining member is movably connected to the positioning shaft so that the retaining member can move along the length of the positioning shaft.

3. The bearing flanging device of claim 2, wherein the positioning shaft is provided with a first external thread connecting portion, and the locking member is provided with a first internal thread through hole matched with the first external thread connecting portion, so that the locking member is screwed on the positioning shaft.

4. The bearing turnup of claim 2 wherein the positioning shaft is provided with length scales along its length.

5. The bearing flanging device of claim 2, wherein an end of the positioning support facing the bearing is provided with a first annular boss surrounding the positioning shaft, and the first annular boss can be inserted between the positioning shaft and the inner ring of the bearing in a clearance fit manner to form an annular clearance.

6. The bearing turnup of claim 5 wherein an end of the positioning leg toward the bearing is provided with a second annular boss surrounding the first annular boss;

the first annular boss and the second annular boss form an avoiding groove therebetween, the second annular boss can abut against the outer ring of the bearing, and the inner ring of the bearing extends into the avoiding groove.

7. The bearing turnup of claim 1 wherein the roll-on-roll assembly comprises a roll support, a roller, and a roll cage;

the rolling support body is sleeved and connected with the positioning shaft, and an annular groove is formed in the end face of one side, facing the bearing, of the rolling support body;

the roller is installed in the annular groove through the rolling frame, a flanging closed angle is formed at one end, facing the bearing, of the roller, and the flanging closed angle extends into the flanging groove and abuts against the outer side wall of the flanging groove.

8. The bearing flanging device as claimed in claim 7, wherein a positioning bushing is further sleeved on the positioning shaft on one side of the roller frame facing the bearing;

the positioning bush can be inserted between the positioning shaft and the inner ring of the bearing in a clearance fit mode to form an annular gap;

and the side wall of the positioning shaft is clamped with a check ring, and two ends of the bushing are respectively abutted against the check ring and the rolling frame.

9. The bearing flanging device of claim 7, wherein a second external thread connecting portion is disposed at one end of the positioning shaft for connecting with the rolling support, and a second internal thread through hole matched with the second external thread connecting portion is formed in the rolling support, so that the positioning shaft is screwed with the rolling support.

10. The bearing turnup of claim 7 wherein the rollers are solid cylinders and the axes of the rollers are at a predetermined angle of inclination to the axis of the locating shaft;

the cylindrical end face of the roller, which is contacted with the annular groove, is a spherical cambered surface.

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