A two-way press-fit die for mosaic spherical plain bearings

Abstract

The present invention discloses a two-way press-fit die for an inlaid joint bearing, comprising a mandrel and two sets of press-fit dies arranged opposite to each other, each set of press-fit dies respectively comprising: an inner ring stop block; an outer ring stop block; and a press-fit base plate, which can be slidably connected between the inner ring stop block and the outer ring stop block, a first reset member is provided between the inner ring stop block and the press-fit base plate, and a second reset member is provided between the outer ring stop block and the press-fit base plate, when the inner ring stop block and the outer ring stop block are respectively pressed against the inner ring end face and the outer ring end face of the joint bearing, the press-fit base plate can overcome the reset force of the first reset member and the second reset member under the action of external force and continue to slide to press the bushing between the inner ring and the outer ring of the joint bearing. The present invention has high press-fitting efficiency, which can improve the efficiency by more than double compared with the traditional press-fitting die, has stable press-fitting quality, and improves the service life of the joint bearing.

Description

Technical Field

[0001] The invention relates to a two-way press-fitting die for an inlaid joint bearing. Background Art

[0002] The press-fit die of the embedded spherical plain bearing plays a very critical assembly role in the production process. The final quality of the embedded spherical plain bearing products depends to a large extent on the ingenuity and precision of the press-fit tooling design.

[0003] like Figure 1 The conventional structure of the inlaid joint bearing press-fit die shown in the figure includes a press-fit upper die 1', a press-fit lower die 2' and a mandrel 3'. Taking the copper-inlaid liner 4' of the rod end joint bearing (including the rod end body 51' and the inner ring 52') as an example, the rod end joint bearing is placed on the mandrel 3' and the press-fit lower die 2', the copper liner 4' is placed, and the press-fit upper die 1' is pressed to press the copper liner into the upper hemisphere of the joint bearing 5'. Then the joint bearing is reversed and another copper liner is press-fit into the lower hemisphere of the joint bearing using the same method. This press-fit die and the inlaid joint bearing made by press-fitting using the die have the following problems:

[0004] (1) This mold is a one-way press-fit tooling, the press-fitting steps are complicated, and the press-fitting efficiency is low.

[0005] (2) After press-fitting, the symmetry accuracy of the inner ring relative to the rod end body (outer ring) is low. In particular, the upper hemispherical bushing after the first press-fit will produce a secondary movement when the lower hemispherical bushing is pressed in reverse, resulting in the upper and lower hemispherical bushings being non-concentric after press-fitting and the ball diameters being inconsistent, thus affecting the service life. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a bidirectional press-fit die for an inlaid spherical plain bearing.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A two-way press-fit die for an inlaid joint bearing, characterized in that it comprises a core shaft and two sets of press-fit dies arranged opposite to each other, the inner ring of the joint bearing can be sleeved on the core shaft, and each set of press-fit dies comprises:

[0009] An inner ring limit block has an inner ring limit surface adapted to the inner ring end surface of the spherical bearing;

[0010] An outer ring stopper having an outer ring stopper surface adapted to an outer ring end surface of the spherical plain bearing; and

[0011] A press-fit base plate is slidably connected between the inner ring limit block and the outer ring limit block, the core shaft can be adapted to be slidably connected in the press-fit base plate, a first reset member is provided between the inner ring limit block and the press-fit base plate, and a second reset member is provided between the outer ring limit block and the press-fit base plate. When the inner ring limit block and the outer ring limit block are respectively pressed against the inner ring end face and the outer ring end face of the spherical bearing, the press-fit base plate can overcome the reset force of the first reset member and the second reset member under the action of external force and continue to slide to press the bushing between the inner ring and the outer ring of the spherical bearing.

[0012] In another preferred embodiment, it further comprises a sheath installed outside the press-fit die.

[0013] In another preferred embodiment, the sheath is mounted on the press-fit base plate by means of locking screws.

[0014] In another preferred embodiment, the distance between the inner ring limit block and / or the outer ring limit block and the press-fit bottom plate is adjustable.

[0015] In another preferred embodiment, the press-fit base plate is provided with a stepped through hole, the adjusting screw passes through the stepped through hole of the press-fit base plate and is screwed onto the inner ring limit block or the outer ring limit block, and the adjusting screw can slide in the stepped through hole.

[0016] The beneficial effects of the present invention are as follows: two sets of press-fit dies arranged opposite to each other are used to extrude the bushings towards the upper hemisphere and the lower hemisphere of the spherical bearing respectively; under the action of the limit blocks and the reset parts on both sides, the bushings after press-fitting are consistent in depth, concentric and have the same ball diameter; the symmetry accuracy of the inner ring and the outer ring is high; at the same time, one-time installation and press-fitting molding can be achieved; the press-fitting efficiency is high; the efficiency can be more than doubled compared with traditional press-fitting dies; the press-fitting quality is stable, and the service life of the spherical bearing is increased.

[0017] Use independent pressing parts, which is easy to replace and improves the applicability of the mold.

[0018] The sheath protects the press-fit mold parts, and also prevents the internal parts of the mold from exploding due to excessive pressure, and also protects the operator.

[0019] The position between the press-fit bottom plate and the limit block can be adjusted by using an adjusting screw. The invention is suitable for the inlay press-fit of bushings of different shapes and different materials of spherical bearings.

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the inlaid type spherical plain bearing bidirectional press-fit die of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The utility model is a schematic diagram of the cross-sectional structure of a press-fitting die of a rod end joint bearing with a gasket in the prior art.

[0022] Figure 2 The present invention is a schematic cross-sectional structure diagram of a bidirectional press-fit die for inserting a gasket into a rod end joint bearing according to a preferred embodiment of the present invention.

[0023] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure from another perspective.

[0024] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of the medium pressure mold being pressed into place.

[0025] Figure 5 It is a schematic cross-sectional structure diagram of another preferred embodiment of the present invention, in which a bidirectional press-fitting die is used to insert a gasket into a special-shaped connecting rod joint bearing. DETAILED DESCRIPTION

[0026] For example, see Figure 2 and Figure 3 As shown, a two-way press-fit die of an inlaid joint bearing of the present invention is applied to the copper-inlaid liner of the rod end joint bearing, which includes a core shaft 1 and two sets of press-fit dies arranged opposite to each other. The inner ring 21 of the rod end joint bearing can be sleeved on the core shaft 1, and each set of press-fit dies includes an inner ring limit block 31, an outer ring limit block 32, a press-fit bottom plate 33, a press sleeve 34 and a sleeve 35. The inner ring limit block 31 has an inner ring limit surface that matches the inner ring end face of the joint bearing; the outer ring limit block 32 has an outer ring limit surface that matches the end face of the rod end eye; the press-fit bottom plate 33 can be slidably connected between the inner ring limit block 31 and the outer ring limit block 32; the core shaft 1 can be adapted and slidably connected in the press-fit bottom plate 33.

[0027] In this embodiment, the outer ring stopper 32 and the inner ring stopper 31 are adjustably connected to the press-fit bottom plate 33 through adjusting screws and springs, respectively. Specifically, taking the outer ring stopper 32 as an example, the press-fit bottom plate 33 is provided with a stepped through hole, the outer ring stopper 32 is provided with a screw hole, the adjusting screw 36 passes through the stepped through hole of the press-fit bottom plate 33 and is screwed on the outer ring stopper 32, the spring 37 is sleeved on the adjusting screw 36 and abuts between the press-fit bottom plate 33 and the outer ring stopper 32. Therefore, the distance between the outer ring stopper 32 and the press-fit bottom plate 33 can be finely adjusted, and the spring 37 prevents the adjusting screw 36 from loosening and also plays a resetting role. The inner ring stopper 31 is connected to the press-fit bottom plate 33 in the same manner. When the inner ring limit block 31 and the outer ring limit block 32 respectively press against the inner ring end face and the rod end eye end face of the spherical bearing, the press-fit base plate 33 can continue to slide under the action of external force to overcome the restoring force of the spring to press the pressing sleeve 34 between the inner ring 21 of the rod end spherical bearing and the rod end eye hole.

[0028] The sleeve 35 is mounted on the press-fit base plate 33 by means of locking screws 38 . Different sleeves can be selected for use according to different shapes of spherical bearings. For example, a clearance opening for the rod end body 22 is provided on the sleeve 35 of the present embodiment.

[0029] The pressing sleeve 34 exists independently of the mold body. During operation, the pressing sleeve 34, the press-fit mold, and the spherical bearing are respectively inserted onto the core shaft. The pressing sleeve 34 is squeezed into the upper and lower hemispheres of the spherical bearing respectively under the pressure of the end surface of the press-fit bottom plate 33.

[0030] The working process of this embodiment is as follows:

[0031] (1) The spherical bearing, the press sleeve 34 and the press-fit die are respectively inserted onto the core shaft 1;

[0032] (2) Before the bidirectional press-fit die applies pressure, the outer ring limit block 32 and the inner ring limit block 31 are in a separated state from the press-fit bottom plate 33 under the action of the spring;

[0033] (3) When pressure is applied to the two sets of press-fit dies, the outer ring limit block 32 forms an interaction force with the rod end body 22 of the spherical bearing, and the inner ring limit block 31 forms an interaction force with the inner ring 21 of the spherical bearing. Pressure is continuously applied to the press-fit bottom plate 33, the spring is compressed, and the press-fit bottom plate 33 continues to slide between the inner ring limit block 31 and the outer ring limit block 32.

[0034] (4) When the pressure is applied to a certain limit, the inner ring limit block 31 and the outer ring limit block 32 are in contact with the press-fit bottom plate 33 respectively, and the spring can no longer be compressed. Then the press-fit process reaches its limit. Figure 4 The movement stroke of the press-fit bottom plate 33 is the movement stroke of the press-fit bottom plate 33 for squeezing the press sleeve 34 .

[0035] During the press-fitting process of the bidirectional press-fitting die for the padded rod end spherical bearing of this embodiment, the limit blocks in the upper and lower die bodies have the same travel distance under the distribution of spring force. The depth of the copper gasket is consistent after press-fitting, and the symmetry accuracy of the inner ring and the rod end body is high.

[0036] The present invention can be used not only for the inlay and press-fit of copper bushings, but also for materials with plastic deformation such as 301, 304, PTFE self-lubricating materials, polymer materials, etc. The shapes of parts can also be diversified, such as Figure 2 As shown, it can also be used as a diagram of the press-fitting mold of the present invention applied to the insert of a common radial spherical plain bearing, Figure 5 The press-fitting die of the present invention is applied to the inlay pad of the special-shaped connecting rod 4 .

[0037] The above embodiments are only used to further illustrate a bidirectional press-fit die of an inlaid spherical bearing of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A two-way press-fit die for an inlaid spherical plain bearing, characterized in that: It includes a core shaft and two sets of press-fit dies arranged opposite to each other. The inner ring of the spherical bearing can be sleeved on the core shaft. Each set of press-fit dies includes: An inner ring limit block has an inner ring limit surface adapted to the inner ring end surface of the spherical bearing; An outer ring stopper having an outer ring stopper surface adapted to an outer ring end surface of the spherical plain bearing; and A press-fit base plate is slidably connected between the inner ring limit block and the outer ring limit block, the core shaft can be adapted to be slidably connected in the press-fit base plate, a first reset member is provided between the inner ring limit block and the press-fit base plate, and a second reset member is provided between the outer ring limit block and the press-fit base plate. When the inner ring limit block and the outer ring limit block are respectively pressed against the inner ring end face and the outer ring end face of the spherical bearing, the press-fit base plate can overcome the reset force of the first reset member and the second reset member under the action of external force and continue to slide to press the bushing between the inner ring and the outer ring of the spherical bearing.

2. A two-way press-fit die for an inlaid spherical plain bearing according to claim 1, characterized in that: Also included is a sheath mounted outside the press-fit die.

3. A two-way press-fit die for an inlaid spherical plain bearing according to claim 2, characterized in that: The sheath is mounted on the press-fit base plate by means of locking screws.

4. The two-way press-fit die for an inlaid spherical plain bearing according to claim 1, characterized in that: The distance between the inner ring limit block and / or the outer ring limit block and the press-fit bottom plate is adjustable.

5. The bidirectional press-fit die for the inlaid spherical plain bearing according to claim 4, characterized in that: The press-fit bottom plate is provided with a stepped through hole, the adjusting screw passes through the stepped through hole of the press-fit bottom plate and is screwed onto the inner ring limit block or the outer ring limit block, the adjusting screw can slide within the stepped through hole, and a spring is sleeved on the adjusting screw.

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