CN116447223A - Joint bearing with inner ring and outer ring not contacted, extrusion die and manufacturing method thereof - Google Patents

Abstract

The disclosure relates to the technical field of bearing dies, in particular to a knuckle bearing with inner and outer rings not contacted, an extrusion die and a manufacturing method thereof. The joint bearing with the inner ring and the outer ring not in contact comprises a limiting part, wherein the limiting part is used for limiting the matched section to move towards the central shaft of the outer ring of the bearing. The joint bearing extrusion die with the inner ring and the outer ring not in contact comprises an upper die, a lower die, a positioning core column, a supporting spring and a bearing gasket; the upper die is connected with the upper chopping block, the lower die is connected with the lower chopping block, a guide column is arranged on the lower chopping block, the upper chopping block is sleeved on the guide column, and the upper chopping block can slide up and down along the guide column; the positioning core column is arranged on the lower chopping board, the supporting spring is sleeved on the positioning core column, the bottom of the supporting spring is abutted with the lower chopping board, and the positioning core column is positioned at the center of the lower die; the positioning core column is sleeved with the detachable bearing gasket, the limiting boss is arranged on the bearing gasket and is clamped with the limiting part, and the problem of loop contact formed during extrusion molding of the bearing inner ring and the outer ring can be avoided.

Description

Joint bearing with inner ring and outer ring not contacted, extrusion die and manufacturing method thereof

Technical Field

The disclosure relates to the technical field of bearing dies, in particular to a knuckle bearing with inner and outer rings not contacted, an extrusion die and a manufacturing method thereof.

Background

The radial spherical plain bearing has the working principle that the outer surface of the inner ring of the bearing and the lubricating material on the inner surface of the outer ring of the bearing are in contact sliding, the contact surface is spherical, the bearing can rotate and swing at any angle during working, and the radial spherical plain bearing has been widely applied to modern industrial practices such as engineering machinery, automobile shock absorbers, hydraulic cylinders and the like. The integral type radial spherical plain bearing formed by extrusion has a simple structure, high reliability in use and extremely high use value, and is increasingly widely applied. At present, the common integral centripetal joint bearing can form loop line contact between the inner ring and the outer ring in the extrusion molding process.

Disclosure of Invention

In order to solve the technical problems, the present disclosure provides a knuckle bearing with inner and outer rings not contacted, and an extrusion die and a manufacturing method thereof.

The first aspect of the present disclosure provides a joint bearing in which inner and outer races are not in contact, comprising: a bearing outer ring;

the bearing outer ring comprises a matching section and a pressure-assisting section positioned above the matching section along the height direction Z;

the bottom surface of cooperation section is equipped with spacing portion, spacing portion is used for restricting the cooperation section is towards the center pin removal of bearing inner race.

Further, the limiting part comprises a limiting protrusion, the limiting protrusion protrudes out of the bottom surface, and the limiting protrusion extends along the circumferential direction of the matching section;

the matching section comprises a first inner surface, a clamping groove is formed in one side, close to the first inner surface, of the limiting protrusion, and the clamping groove extends along the circumferential direction of the matching section;

and/or the matching section comprises a first outer surface, wherein the first outer surface is provided with a bearing boss, and the bearing boss extends along the circumferential direction of the matching section;

and/or a connecting section is arranged between the pressure assisting section and the matching section, the connecting section comprises a second inner surface, a deformation assisting groove is formed in the second inner surface, and the deformation assisting groove extends along the circumferential direction of the connecting section.

Further, along the height direction Z, the height H1 of the limiting protrusion satisfies: 0.7 H1 is less than or equal to 0.8mm.

Further, the transformation-assisting groove comprises a first side wall and a second side wall, the first side wall is intersected with the second side wall, and an included angle beta between the first side wall and the second side wall meets the following conditions: beta is more than or equal to 58 degrees and less than or equal to 62 degrees;

and/or, the depth a of the auxiliary deformation groove is as follows: a is more than or equal to 0.9mm and less than or equal to 1mm;

and/or, the height b of the auxiliary variable groove meets the following conditions: b is more than or equal to 1.3mm and less than or equal to 1.4mm.

Further, the booster section includes a second outer surface and a third inner surface;

in a height direction Z and from top to bottom, the second outer surface is inclined toward a direction away from the central axis;

the included angle alpha between the second outer surface and the third inner surface satisfies the following conditions: alpha is more than or equal to 29 degrees and less than or equal to 32 degrees.

Further, the first inner surface of the mating segment includes a spherical surface and the second inner surface is a vertical surface.

Further, still include the bearing inner race, the bearing inner race with be equipped with clearance L between the bearing outer lane, clearance L satisfies: l is more than or equal to 0.2 and less than or equal to 0.6mm;

and/or the Rockwell hardness of the bearing inner ring material is 55-62;

and/or the Rockwell hardness of the bearing outer ring material is 28-37; the roughness Ra=2-8 μm of the inner surface of the bearing outer ring.

A second aspect of the present disclosure provides a joint bearing extrusion die for extruding a joint bearing with inner and outer rings in contact, the joint bearing comprising: the device comprises an upper die, a lower die, a positioning core column, a supporting spring and a bearing gasket;

the upper die is connected with the lower surface of the upper chopping block, the lower die is connected with the upper surface of the lower chopping block, a guide column is arranged on the lower chopping block, the upper chopping block is sleeved on the guide column, and the upper chopping block can slide up and down along the guide column under the action of the extrusion driving device;

the positioning core column is arranged on the lower cutting board, the supporting spring is sleeved on the positioning core column, the bottom of the supporting spring is in butt joint with the lower cutting board, and the positioning core column is positioned at the center of the lower die;

the bearing gasket is detachably sleeved on the positioning core column, a limiting boss is arranged on the bearing gasket, and the limiting boss is clamped with the limiting part.

Further, the extrusion driving device is a press, a return spring is sleeved on the guide post, the top of the return spring is in butt joint with the upper cutting board, the upper die is provided with a cavity, and the second outer surface of the bearing outer ring is matched with the cavity;

the cavity of the upper die is a conical cavity.

The third aspect of the present disclosure discloses a method for manufacturing a knuckle bearing with inner and outer rings in non-contact, which uses a knuckle bearing extrusion die with inner and outer rings in non-contact provided by the second scheme, and includes the steps of:

placing the bearing inner ring into the bearing outer ring from the top of the bearing outer ring, and aligning the position of the bearing inner ring to enable the central axes of the bearing inner ring and the bearing outer ring to coincide;

the bearing gasket, the bearing inner ring and the bearing outer ring are integrally placed in a lower die of the extrusion die, the bearing gasket and the bearing inner ring are sleeved on a positioning core column of the lower die, the lower surfaces of the bearing inner ring and the bearing outer ring are attached to the bearing gasket, and a limiting boss of the bearing gasket is clamped on the inner edge of a limiting part on the bottom surface of the bearing outer ring and limits the position of the bearing outer ring;

the extrusion driving device extrudes the upper chopping board, the upper chopping board drives the upper die to move downwards to extrude the bearing outer ring to shrink inwards, the extrusion driving device extrudes to set displacement and maintains pressure for a period of time, the bearing outer ring deforms, and the upper part of the inner surface of the bearing outer ring is close to the bearing inner ring and keeps a certain gap;

and removing the extrusion driving device, lifting and resetting the upper die under the action of a reset spring, taking out the extruded bearing inner ring and bearing outer ring assembly, and carrying out finish machining on the bearing outer ring to remove the allowance.

Furthermore, before the assembly of the bearing inner ring and the bearing outer ring is taken out, the bearing inner ring fixing agent is added into a gap between the bearing inner ring and the bearing outer ring.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the joint bearing with the inner ring and the outer ring not in contact provided by the embodiment of the disclosure comprises a bearing outer ring; along the height direction Z, the bearing outer ring comprises a matching section and a pressure-assisting section positioned above the matching section; the bottom surface of cooperation section is equipped with spacing portion, and spacing portion is used for restricting the cooperation section and removes towards the center pin of bearing inner race. In the extrusion process of the knuckle bearing with the inner ring and the outer ring not contacted, the compression assisting section of the bearing outer ring deforms, the lower matching section cannot be adductively deformed under the action of the limiting part, so that the bearing outer ring cannot be contacted with the bearing inner ring, and the problem that the traditional knuckle bearing can form loop line contact between the bearing inner ring and the bearing outer ring in the extrusion process is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic diagram of a joint bearing matched structure in which a joint bearing extrusion die with inner and outer rings not contacted with each other and the joint bearing with the inner and outer rings not contacted with each other before extrusion provided by an embodiment of the disclosure;

FIG. 2 is a schematic diagram of a mating structure of a semi-finished outer bearing ring and an inner bearing ring before extrusion of a knuckle bearing with no contact between the inner and outer rings according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a schematic diagram of a mating structure of a semi-finished bearing outer ring and a bearing inner ring after extrusion of a knuckle bearing with no contact between the inner and outer rings according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another structure of a finished joint bearing with inner and outer rings not in contact according to an embodiment of the present disclosure.

Reference numerals: 1. a bearing outer ring; 11. a mating section; 111. a first inner surface; 112. a clamping groove; 113. a first outer surface; 12. a connection section; 121. a second inner surface; 13. a boosting section; 131. a third inner surface; 132. a second outer surface; 2. a gap; 3. a bearing inner ring; 5. a transformation-assisting groove; 51. a first sidewall; 52. a second sidewall; 6. a pressure bearing boss; 7. a limit boss; 8. a load bearing pad; 9. a limit part; 14. a support spring; 15. positioning a stem; 16. a lower die; 17. an upper chopping board; 18. a guide post; 19. a return spring; 20. and (5) feeding a die.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.

In the extrusion molding process of a common integral type radial spherical plain bearing, loop line contact is formed between an inner ring and an outer ring, the outer ring is molded under the extrusion action of a die by taking the contact position of the outer ring and the inner ring as a fulcrum, the lubricating layer in the bearing is easy to damage, the lubricating layer is inconvenient to replace, meanwhile, the gap consistency of the inner ring and the outer ring of the bearing is very low, the stress concentration phenomenon of the bearing is obvious, the service life of the bearing is reduced, the service performance of the bearing is unstable, and the bearing is frequently jammed and dislocated.

Therefore, research and development of an extrusion manufacturing process and product which do not generate loop contact during extrusion molding, have no damage to the lubrication layer, and have good consistency of the gap between the inner and outer rings are key to solving the problems.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, and fig. 6, the knuckle bearing with inner and outer rings not in contact provided by the embodiments of the present disclosure includes a bearing outer ring 1; along the height direction Z, the bearing outer ring 1 comprises a matching section 11 and a pressure-assisting section 13 positioned above the matching section 11; the bottom surface of mating segment 11 is equipped with spacing portion 9, and spacing portion 9 is used for restricting the center pin removal of mating segment 11 towards bearing outer lane 1. In the extrusion process of the knuckle bearing with the inner ring and the outer ring not in contact, the compression-assisting section 13 of the bearing outer ring 1 deforms, the lower matching section 11 cannot be retracted and deformed under the action of the limiting part 9, so that the bearing outer ring 1 cannot be in contact with the bearing inner ring 3, and the problem that the traditional knuckle bearing with the inner ring and the outer ring not in contact can form loop contact between the bearing inner ring 3 and the bearing outer ring 1 in the extrusion process is solved. By controlling the extrusion position of the upper die 20, the bearing outer ring 1 can be prevented from contacting the bearing inner ring 3, the finish of the bearing friction surface is not affected, and the lubrication performance of the finished joint bearing product with the inner ring and the outer ring not contacting is ensured.

In some specific embodiments, the limiting portion 9 includes a limiting protrusion protruding from the bottom surface, the limiting protrusion extending along the circumference of the mating segment 11; the mating segment 11 includes a first inner surface 111, and a clamping groove 112 is formed on a side of the limiting protrusion, which is close to the first inner surface 111, and the clamping groove 112 extends along a circumferential direction of the mating segment 11. In the extrusion process of the knuckle bearing with the inner ring and the outer ring not contacted, the compression assisting section 13 of the bearing outer ring 1 is deformed, the lower matching section 11 cannot be retracted and deformed under the action of the limiting bulge, the bearing outer ring 1 cannot be contacted with the bearing inner ring 3,

in some specific embodiments, along the height direction Z, the height H1 of the limit bump satisfies: 0.7 H1 is less than or equal to mm and less than or equal to 0.8 and mm. Eccentricity caused by movement of the bearing outer ring 1 during extrusion can be prevented; and after extrusion is finished, the filling of the bearing fixing agent is convenient before the residual materials are removed, so that the residual materials are processed. If the size is too small, the limiting effect cannot be achieved.

In some specific embodiments, the mating segment 11 comprises a first outer surface 113, the first outer surface 113 being provided with pressure-bearing bosses 6, the pressure-bearing bosses 6 extending in the circumferential direction of the mating segment 11. The bearing outer ring 1 is provided with a pressure bearing boss 6 outside, so that the bearing outer ring 1 can be prevented from sinking into the bearing lower die 16 during extrusion. The possibility of the bearing outer race 1 being caught in the lower die 16 during the pressing process and not being able to be taken out is reduced or avoided.

Preferably, the height H2 of the bearing boss 6 of the bearing outer ring 1 is 2 mm, the length L2 of the upper edge is 2 mm, and the length L3 of the lower edge is 2.5 mm, so that the situation that the bearing outer ring 1 cannot be taken out when being extruded into the lower die 16 can be effectively prevented, and meanwhile, the internal stress state of the bearing outer ring 1 during forming can be improved, and the overall internal stress of the bearing outer ring 1 is more uniform. If the pressure-bearing boss 6 is too short, the bearing function cannot be realized.

In some embodiments, a connection section 12 is provided between the pressure-assisting section 13 and the mating section 11, the connection section 12 comprising a second inner surface 121, the second inner surface 121 being provided with a deformation-assisting groove 5, the deformation-assisting groove 5 extending in the circumferential direction of the connection section 12. The second inner surface 121 is provided with a deformation-assisting groove 5, which is beneficial to deformation of the bearing outer ring 1 during extrusion, so that the bearing outer ring 1 is abutted against the outer surface of the bearing inner ring 3.

In some embodiments, the variation-promoting groove 5 includes a first sidewall 51 and a second sidewall 52, the first sidewall 51 and the second sidewall 52 intersecting, and an included angle β between the first sidewall 51 and the second sidewall 52 satisfying: beta is more than or equal to 58 degrees and less than or equal to 62 degrees, and deformation of the bearing outer ring 1 during extrusion is facilitated. If the angle is too small, two surfaces of the auxiliary deformation groove 5 can be contacted in advance during extrusion, so that the extrusion force born by the bearing outer ring 1 is suddenly changed, and the forming effect is affected. If the angle is too large, the problem of insufficient extrusion occurs, and the gap 2 between the bearing outer ring 1 and the bearing inner ring 3 is larger after the knuckle bearing with the inner ring and the outer ring not contacted is formed.

The corner bottom of the transformation-assisting groove 5 can be provided with a round corner for conveniently processing a cutter, and the integral forming effect is not affected.

In some embodiments, the depth a of the assist recess 5 satisfies: a is more than or equal to 0.9mm and less than or equal to 1mm; if the depth a of the deformation-promoting groove 5 is too long, the upper half of the bearing outer ring 1 will touch the bearing inner ring 3 during the forming process, and excessive extrusion will occur. If the depth a of the assist recess 5 is too short, the extrusion may be insufficient.

Optionally, the upper end of the auxiliary deformation groove 5 is leveled with the top end of the bearing inner ring 3, so that the processing is easier in the process of removing the excess materials after the bearing is formed, and the outer surface of the inner ring is not scratched.

In some embodiments, the height b of the assist recess 5 satisfies: b is more than or equal to 1.3mm and less than or equal to 1.4mm. If the height b of the auxiliary variation groove 5 is too deep, the upper end of the auxiliary variation groove 5 is easy to break during extrusion or excessively extrude; if the height b of the assist recess 5 is too shallow, the pressing force required for pressing increases, so that the pressing is insufficient.

In some specific embodiments, the booster section 13 includes a second outer surface 132 and a third inner surface 131; in the height direction Z and from top to bottom, the second outer surface 132 is inclined toward a direction away from the central axis; the angle α between the second outer surface 132 and the third inner surface 131 satisfies: alpha is more than or equal to 29 degrees and less than or equal to 32 degrees. The angle alpha at the top of the blank of the bearing outer ring 1 is 29-32 degrees, the forming effect is good, the damage to the forming surface of the die is small, and the service life of the die can be prolonged.

If the angle alpha is too large, the gap 2 between the inner ring and the outer ring of the bearing is too small when the bearing is formed, and the forming effect is affected; meanwhile, the contact area between the bearing vertex angle and the molding surface of the mold is too large due to the excessively large angle, so that friction resistance is increased, and damage to the molding surface of the mold is increased. If the angle alpha is too small, the gap 2 between the inner ring and the outer ring of the bearing is too large when the bearing is formed, and the requirement of a finished product of the final bearing is not met.

In some embodiments, the second outer surface 132 smoothly transitions to the third inner surface 131. Under the extrusion of the cavity, the second outer surface 132 of the bearing can shrink inwards to deform, so that the deformation amount is large, and the second inner surface 121 of the bearing can be driven to deform inwards, so that the forming under a good internal stress state can be ensured.

In some specific embodiments, the first inner surface 111 of the mating segment 11 includes a spherical surface and the second inner surface 121 is a vertical surface. Because the first inner surface 111 is not deformed substantially during molding, the spherical first inner surface 111 can better adapt to the shape of the bearing inner ring 3, and the second inner surface 121 deforms more during molding, and by the special structural design of the auxiliary deformation groove 5 in the blank of the bearing outer ring 1, the top angle α of the bearing outer ring 1, and the like, the molded bearing inner ring can be substantially parallel to the shape of the bearing inner ring 3, and appropriate gaps are left for filling the lubricating material.

In some specific embodiments, the bearing further comprises a bearing inner ring 3, a gap L is arranged between the bearing inner ring 3 and the bearing outer ring 1, and the gap L satisfies: l is more than or equal to 0.2 and less than or equal to 0.6 and mm. Solid lubricating material can be filled in the gap 2, and the integral type spherical plain bearing capable of being filled with the lubricating material and not contacted with the inner ring and the outer ring can be manufactured. Different kinds of bearing lubricating materials can be injected into the gap 2 between the bearing inner ring 3 and the bearing outer ring 1, so that the spherical plain bearing which meets different requirements and is not contacted with the inner ring and the outer ring is manufactured.

The gap 2 between the bearing inner ring 3 and the bearing outer ring 1 of the knuckle bearing which is not contacted with the inner ring and the outer ring is filled with a lubricating material to replace an inner ring fixing agent.

The hardness of the bearing inner ring 3 is too low, and the outer spherical surface of the bearing inner ring 3 is more easily scratched in the working process; the bearing inner ring 3 is too hard and is prone to fracture under impact load. The hardness of the inner ring 3 of the bearing is too high, and the hardness of the outer ring 1 of the bearing is too low, so that the performance of the joint bearing after being formed can be affected, and the strength and the abrasion resistance of the joint bearing are reduced; the hardness of the bearing outer ring 1 is too high, so that the forming pressure required during forming is increased, the contact pressure between the top of the bearing and the die is increased, and the die is more easily damaged. Too small roughness of the inner surface of the bearing outer ring 1 and too smooth surface can cause poor interface bonding property between the lubricating material in the gap 2 and the inner surface of the bearing outer ring 1, and the lubricating material is easy to peel off; the roughness of the inner surface of the bearing outer ring 1 is overlarge, so that stress concentration is easy to cause under the action of alternating load, and fatigue strength is reduced. Based on the above, in the embodiment of the present disclosure, the rockwell hardness of the material of the bearing inner ring 3 is 55 to 62; and/or the Rockwell hardness of the material of the bearing outer ring 1 is 28-37; the inner surface roughness ra=2-8 μm of the bearing outer ring 1.

Optionally, the material of the bearing inner ring 3 is 440C stainless steel, and the material of the bearing outer ring 1 is 17-4PH alloy stainless steel.

The joint bearing extrusion die with the inner ring and the outer ring not in contact is used for extruding the joint bearing with the inner ring and the outer ring not in contact. The joint bearing extrusion die with the inner ring and the outer ring not contacted comprises an upper die 20, a lower die 16, a positioning core column 15, a supporting spring 14 and a bearing gasket 8; the upper die 20 is connected with the lower surface of the upper chopping block 17, the lower die 16 is connected with the upper surface of the lower chopping block, the lower chopping block is provided with a guide column 18, the upper chopping block 17 is sleeved on the guide column 18, and the upper chopping block 17 can slide up and down along the guide column 18 under the action of the extrusion driving device; the positioning core column 15 is arranged on the lower chopping board, the supporting spring 14 is sleeved on the positioning core column 15, the bottom of the supporting spring 14 is in butt joint with the lower chopping board, and the positioning core column 15 is positioned at the center of the lower die 16; the bearing gasket 8 is detachably sleeved on the positioning core column 15, the bearing gasket 8 is provided with a limiting boss 7, and the limiting boss 7 is clamped with the limiting part 9.

The deformation-assisting groove 5 is formed in the bearing outer ring 1, deformation is easier to occur during extrusion, and the bearing outer ring 1 is enabled to be abutted against the outer surface of the bearing inner ring 3; meanwhile, the outer surface of the bearing outer ring 1 is provided with a pressure-bearing boss 6, so that the bearing outer ring 1 is reduced or prevented from sinking into the lower die 16 in the extrusion process, and the bearing outer ring is not beneficial to taking out; the concentricity of the inner ring and the outer ring of the bearing is determined by the positioning core column 15 and the lower die 16, so that the bearing cannot deviate; in the bearing extrusion process, the upper part of the bearing outer ring 1 deforms, the lower part cannot be retracted and deformed under the action of the limiting boss 7, and the outer ring cannot be contacted with the bearing inner ring 3; when the extrusion descends to a fixed position, the guide post 18 is contacted with the end face of the press, so that the generation of overpressure is prevented, the accuracy of the pressing position of the die is ensured, the extrusion precision of the joint bearing with the inner ring and the outer ring not contacted and the smoothness of the outer surface of the bearing inner ring 3 are ensured, and the lubrication performance of a finished bearing product is not influenced; the guide post 18 ensures levelness when the upper die 20 descends, so that the upper die cannot incline, and processing accuracy is ensured; the supporting spring 14 not only plays a role in buffering to prevent the bearing from being over-pressed, but also relieves pressure and resets after the extrusion is finished to push up the joint bearing which is not contacted with the inner ring and the outer ring upwards so as to be convenient to take out; and paraffin is injected into gaps of the inner ring and the outer ring of the extruded bearing, so that collision contact is avoided when the position of the inner ring is fixed, the processing is facilitated, and the processing quality and the processing speed are ensured.

The lower half part of the bearing outer ring 1 is limited by the limiting boss 7 and does not adduction displacement during extrusion, the upper half part of the bearing outer ring 1 deforms, the extrusion position of the upper die 20 is controlled to ensure that the semi-finished product of the bearing outer ring 1 cannot contact with the bearing inner ring 3, the finish of a bearing friction surface is not influenced, and the lubricating property of a bearing finished product is ensured. Meanwhile, the guide post 18 ensures levelness when the upper die 20 descends, so that the upper die cannot incline, and processing accuracy is ensured; the die pressing position is limited by the height of the guide post 18, the guide post 18 is contacted with the end face of the press machine to be stable, overpressure is prevented from being generated, and the extrusion accuracy and the bearing extrusion accuracy are ensured.

The bearing gaskets 8 are multiple, and the multiple bearing gaskets 8 correspond to different inner and outer ring gaps 2, types of bearing inner rings 3 and bearing outer ring 1 assemblies.

The guide posts 18 are height adjustable. And products with different specifications are processed at different extrusion positions.

The extrusion driving device is a press, and the guide post 18 is provided with a return spring 19 of the upper chopping board 17.

The upper die 20 is provided with a cavity, and the upper part of the bearing outer ring 1 is provided with a tangential plane matched with the cavity. The cavity of the upper mold 20 is a tapered cavity. In some specific embodiments, the extrusion driving device is a press, the guide post 18 is sleeved with a return spring 19, the top of the return spring 19 is abutted against the upper chopping board 17, the upper die 20 is provided with a cavity, and the second outer surface 132 of the bearing outer ring 1 is matched with the cavity. Under the extrusion of the cavity, the second outer surface 132 of the bearing will shrink and deform inwards, the deformation amount is larger, and the second inner surface 121 of the bearing will be driven to deform inwards, but due to the special shape design of the deformation assisting groove 5 and the outer surface of the outer ring 1 of the bearing, the deformation amount of the second inner surface 121 is relatively smaller, and the forming under a better internal stress state can be ensured.

In some embodiments, the cavity of the upper mold 20 is a conical cavity. The conical cavity can ensure the molding precision of the mold, and gradually contracts inwards after contacting with the second outer surface of the bearing during extrusion, so that the contraction process is smooth, abrupt change can not occur, and the stability of the internal stress state of the bearing after molding is ensured.

The third aspect of the present disclosure discloses a method for manufacturing a knuckle bearing with inner and outer rings in non-contact, which uses a knuckle bearing extrusion die with inner and outer rings in non-contact provided by the second scheme, and includes the steps of:

the bearing inner ring 3 is placed inside from the top of the bearing outer ring 1, and the position of the bearing inner ring 3 is adjusted so that the central axes of the bearing inner ring 3 and the bearing outer ring 1 are coincident, as shown in fig. 2.

The bearing gasket 8, the bearing inner ring 3 and the bearing outer ring 1 are integrally placed in a lower die 16 of an extrusion die, as shown in fig. 1, the bearing gasket 8 and the bearing inner ring 3 are sleeved on a positioning core column 15 of the lower die 16, the lower surfaces of the bearing inner ring 3 and the bearing outer ring 1 are attached to the bearing gasket 8, and a limit boss 7 of the bearing gasket 8 is clamped on the inner edge of a limit part of the bottom surface of the bearing outer ring 1 and limits the position of the bearing outer ring 1. As shown in fig. 1; the position of the bearing outer ring 1 is limited by a limiting boss 7 on a bearing gasket 8, so that the bearing outer ring is ensured not to be adductively deviated during extrusion.

The extrusion driving device extrudes the upper chopping board 17, the upper chopping board 17 drives the upper die 20 to move downwards to extrude the outer ring of the bearing to shrink inwards, the extrusion driving device extrudes to set displacement and maintains pressure for a period of time, the outer ring 1 of the bearing deforms, and the upper part of the inner surface of the outer ring 1 of the bearing is close to the inner ring 3 of the bearing and keeps a certain gap 2; as shown in fig. 5; the gap 2 between the inner ring and the outer ring ensures that the inner ring and the outer ring are not contacted with each other when the bearing is formed, and the bearing is provided with the gap 2 filled with lubricating materials after the bearing is formed.

And removing the extrusion driving device, lifting and resetting the upper die 20 under the action of the reset spring 19, taking out the assembly of the extruded bearing inner ring 3 and the bearing outer ring 1, carrying out finish machining on the bearing outer ring 1, removing the allowance, and processing into the knuckle bearing which meets the requirements and is not contacted with the inner ring and the outer ring, as shown in fig. 6.

In some specific embodiments, before the assembly of the bearing inner ring 3 and the bearing outer ring 1 is taken out, the bearing inner ring fixing agent is added into the gap 2 between the bearing inner ring 3 and the bearing outer ring 1, so that damage caused by contact collision of inner smooth surfaces and outer smooth surfaces of the inner ring and the outer ring can be avoided when the bearing outer ring 1 is machined for the rest.

Optionally, the bearing inner ring fixing agent is paraffin.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The above is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A knuckle bearing with inner and outer races free of contact, comprising: a bearing outer ring (1);

along the height direction (Z), the bearing outer ring (1) comprises a matching section (11) and a pressure-assisting section (13) positioned above the matching section (11);

the bottom surface of cooperation section (11) is equipped with spacing portion (9), spacing portion (9) are used for restricting cooperation section (11) are towards the center pin removal of bearing inner race (1).

2. The joint bearing of claim 1, wherein the limiting part (9) comprises a limiting protrusion protruding from the bottom surface, the limiting protrusion extending along the circumferential direction of the mating section (11), the mating section (11) comprises a first inner surface (111), a clamping groove (112) is formed on one side of the limiting protrusion near the first inner surface (111), and the clamping groove (112) extends along the circumferential direction of the mating section (11);

and/or the mating segment (11) comprises a first outer surface (113), the first outer surface (113) is provided with a bearing boss (6), and the bearing boss (6) extends along the circumference of the mating segment (11);

and/or, have linkage segment (12) between helping press section (13) and cooperation section (11), linkage segment (12) include second internal surface (121), second internal surface (121) are equipped with helping and become recess (5), helping and become recess (5) along the circumference extension of linkage segment (12).

3. The knuckle bearing of claim 2, wherein in the height direction (Z), the height H1 of the limit projection satisfies: 0.7 H1 is less than or equal to 0.8mm.

4. The knuckle bearing of claim 2, wherein said deformation promoting groove (5) includes a first side wall (51) and a second side wall (52), said first side wall (51) and said second side wall (52) intersect, and an included angle β between said first side wall (51) and said second side wall (52) satisfies: beta is more than or equal to 58 degrees and less than or equal to 62 degrees;

and/or the depth a of the auxiliary variation groove (5) is as follows: a is more than or equal to 0.9mm and less than or equal to 1mm;

and/or the height b of the auxiliary variation groove (5) is as follows: b is more than or equal to 1.3mm and less than or equal to 1.4mm.

5. The knuckle bearing of claim 2, wherein said pressure-assist section (13) includes a second outer surface (132) and a third inner surface (131);

in a height direction (Z) and from top to bottom direction, the second outer surface (132) is inclined towards a direction away from the central axis;

-the angle a of the second outer surface (132) with the third inner surface (131) satisfies: alpha is more than or equal to 29 degrees and less than or equal to 32 degrees.

6. The spherical plain bearing of claim 2, wherein the first inner surface (111) comprises a spherical surface and the second inner surface (121) is a vertical surface.

7. The knuckle bearing of any one of claims 1 to 6, further comprising a bearing inner ring (3), a gap (2) L being provided between the bearing inner ring (3) and the bearing outer ring (1), the gap (2) L satisfying: l is more than or equal to 0.2 and less than or equal to 0.6mm;

and/or the Rockwell hardness of the material of the bearing inner ring (3) is 55-62;

and/or the Rockwell hardness of the material of the bearing outer ring (1) is 28-37; the inner surface roughness Ra=2-8 mu m of the bearing outer ring (1).

8. A knuckle bearing extrusion die for extruding an inner and outer race non-contact knuckle bearing according to any one of claims 1 to 7, comprising: an upper die (20), a lower die (16), a positioning core column (15), a supporting spring (14) and a bearing gasket (8);

the upper die (20) is connected with the lower surface of the upper chopping block (17), the lower die (16) is connected with the upper surface of the lower chopping block, a guide column (18) is arranged on the lower chopping block, the upper chopping block (17) is sleeved on the guide column (18), and the upper chopping block (17) can slide up and down along the guide column (18) under the action of the extrusion driving device;

the positioning core column (15) is arranged on the lower cutting board, the supporting spring (14) is sleeved on the positioning core column (15), the bottom of the supporting spring (14) is abutted to the lower cutting board, and the positioning core column (15) is positioned at the center of the lower die (16);

the bearing gasket (8) is detachably sleeved on the positioning core column (15), a limiting boss (7) is arranged on the bearing gasket (8), and the limiting boss (7) is clamped with the limiting part (9).

9. The knuckle bearing extrusion die of claim 8, wherein the extrusion driving device is a press, a return spring (19) is sleeved on the guide post (18), the top of the return spring (19) is abutted against the upper chopping board (17), the upper die (20) is provided with a cavity, and the second outer surface (132) of the bearing outer ring (1) is matched with the cavity;

the cavity of the upper die (20) is a conical cavity.

10. A method for manufacturing a knuckle bearing in which inner and outer rings are not in contact, using the knuckle bearing extrusion die in which the inner and outer rings are not in contact according to claim 9, comprising the steps of:

placing the bearing inner ring (3) into the bearing outer ring (1), and aligning the position of the bearing inner ring (3) to enable the central axes of the bearing inner ring (3) and the bearing outer ring (1) to coincide;

the bearing gasket (8), the bearing inner ring (3) and the bearing outer ring (1) are integrally placed in a lower die (16) of an extrusion die, the bearing gasket (8) and the bearing inner ring (3) are sleeved on a positioning core column (15) of the lower die (16), the lower surfaces of the bearing inner ring (3) and the bearing outer ring (1) are attached to the bearing gasket (8), and a limit boss (7) of the bearing gasket (8) is clamped on the inner edge of a limit part (9) on the bottom surface of the bearing outer ring (1) and limits the position of the bearing outer ring (1);

the extrusion driving device extrudes the upper chopping board (17), the upper chopping board (17) drives the upper die (20) to move downwards to extrude the bearing outer ring (1) to shrink inwards, the extrusion driving device extrudes to set displacement and maintains pressure for a period of time, the bearing outer ring (1) deforms, and the upper part of the inner surface of the bearing outer ring (1) is close to the bearing inner ring (3) and keeps a certain gap (2);

and removing the extrusion driving device, lifting and resetting the upper die (20) under the action of a reset spring (19), taking out the extruded bearing inner ring (3) and bearing outer ring (1) combined body, and carrying out finish machining on the bearing outer ring (1) to remove the allowance.