CN113700785A

CN113700785A - Anti-fatigue rubber node with high bearing capacity

Info

Publication number: CN113700785A
Application number: CN202110925832.4A
Authority: CN
Inventors: 李东阁; 杨哲; 於珂睿; 孙海燕; 李刚; 冯永平
Original assignee: Zhuzhou Times Ruiwei Damping Equipment Co Ltd
Current assignee: Zhuzhou Times Ruiwei Damping Equipment Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2021-11-26
Anticipated expiration: 2041-08-12
Also published as: CN113700785B

Abstract

The invention discloses an anti-fatigue rubber node with high bearing capacity, which comprises a vertical mandrel, an annular rubber layer and a limiting groove, wherein the annular rubber layer is bonded with the mandrel by vulcanization around the periphery of the mandrel; the lower convex edge is arranged on the periphery of the mandrel lower than the limiting groove, so that the descending resistance of the rubber layer at the section where the limiting groove is located when the rubber layer descends due to the heavy pressure of the motor mounting seat is remarkably increased, and the pressure on the rubber layer below the lower convex edge is shared. The supporting wall with multi-stage partition walls is additionally arranged on the periphery of the tray, so that the rubber layer at the lower part of the rubber node can be compensated for rigidity in time in the process of fatigue failure gradually generated under the action of long-time high-frequency vibration and heavy pressure; meanwhile, the supporting wall plays a role in radially limiting deformation and expansion of the rubber layer at the lower part of the rubber node to a great extent, and the service life of the rubber node can be obviously prolonged.

Description

Anti-fatigue rubber node with high bearing capacity

Technical Field

The invention relates to a rubber node, in particular to an anti-fatigue rubber node with high bearing capacity, and belongs to the technical field of rubber nodes.

Background

The power of the existing high-speed train is provided by motors distributed on power bogies of a plurality of carriages of the train, and the motors are arranged on the power bogies through motor mounting seats.

A rubber node used for mounting a motor on the bogie is provided with a vertical mandrel, the periphery of the mandrel is a cylindrical rubber layer which is formed by bonding the mandrel and the mandrel through vulcanization and has specific radial thickness and axial height, and the middle section of the periphery of the rubber layer is provided with an annular limiting groove with certain radial depth. The motor mounting base is provided with a plurality of (generally 4) vertical mounting holes, and the motor mounting base is installed on the bogie in a suspension mode through the rubber nodes sleeved in the mounting holes. The rubber layer on the periphery of the rubber node is mainly used for inhibiting high-frequency vibration of a motor on the motor mounting seat, buffering forces in all directions on the motor mounting seat caused by motor starting and train running vibration, and simultaneously bearing the total weight of the motor and the motor mounting seat thereof. In order to effectively restrain the high-frequency vibration of the motor on the motor mounting seat and effectively buffer the force of the motor mounting seat in all directions, the radial thickness of the rubber layer and the height of the rubber layer above and below the mounting hole have standard requirements.

Under the prior art, the motor and the motor mounting seat for mounting the motor have large weight, and meanwhile, due to high-frequency vibration during the operation of the motor, a rubber layer at the lower part of a rubber node is subjected to heavy pressure and high-frequency vibration for a long time and then gradually becomes fatigue failure, and further seriously bulges outwards (see the attached figure 13 of the specification), so that the motor mounting seat and the motor are integrally sunk, and the engagement between the output end of the motor and a transmission mechanism is adversely affected; meanwhile, the rigidity of the rubber layer bulging outward is changed, and the effect of suppressing the high-frequency vibration of the motor is deteriorated.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the rubber layer at the lower part of the rubber node is subjected to fatigue failure due to long-term heavy pressure in a high-frequency vibration environment.

Aiming at the problems, the technical scheme provided by the invention is as follows:

an anti-fatigue rubber node with high bearing capacity comprises a vertical mandrel, an annular rubber layer which is bonded with the mandrel by vulcanization around the periphery of the mandrel, and a radially recessed limiting groove arranged in the middle section of the periphery of the rubber layer; and the periphery of the mandrel lower than the limiting groove is provided with a lower convex edge which provides downward resistance for the rubber layer at the section where the limiting groove is located.

Furthermore, the periphery of the mandrel higher than the limiting groove is provided with an upper convex edge which is symmetrically arranged with the lower convex edge.

Further, the lower convex edge is provided with a downward slope surface which is inclined upwards; the limiting groove is provided with a lower groove wall and a groove bottom; the thickness of the rubber layer between the lower slope surface and the lower groove wall is larger than that between the groove bottom and the mandrel.

Furthermore, one section of rubber layer below the limiting groove is a pressure expansion section of the rubber layer, the diameter of the upper part of the pressure expansion section is larger than that of the lower end of the pressure expansion section, and the peripheral surface of the pressure expansion section is a conical pressure expansion surface.

Further, the rubber node is provided with a tray which can be fixed at the bottom end of the mandrel and used for supporting the bottom end of the rubber layer; the periphery of the tray is provided with an annular raised supporting wall, and a gap is reserved between the supporting wall and the compression expansion surface in the initial application period.

Further, the support wall is a rubber body bonded to the tray by vulcanization.

Furthermore, the inner wall of the supporting wall is provided with a plurality of layers of dividing walls, and V-shaped rigidity control grooves for controlling the radial rigidity of the dividing walls are arranged among the plurality of layers of dividing walls; the thickness from the top to the base of the dividing wall is thickened from thin to thick.

Furthermore, the inner side surface of each partition wall is divided into an upper primary pressure surface and a lower secondary pressure surface, and the distance between the primary pressure surface and the pressure expansion surface of each partition wall is smaller than the distance between the secondary pressure surface and the pressure expansion surface.

Furthermore, the partition walls are provided with three layers, and the partition walls are divided into a first partition wall positioned in the middle layer, a second partition wall positioned in the lower layer and a third partition wall positioned in the upper layer according to the order of contact pressure expansion surfaces; the steel control grooves on the outer sides of the first division wall, the second division wall and the third division wall are respectively a first steel control groove, a second steel control groove and a third steel control groove; the distance between the first dividing wall and the pressure expansion face is smaller than the distance between the second dividing wall and the pressure expansion face, and the distance between the second dividing wall and the pressure expansion face is smaller than the distance between the third dividing wall and the pressure expansion face.

Further, the top of the supporting wall outside the third control rigid groove is provided with a pressing table for finally supporting the motor mounting seat.

Has the advantages that:

1. because the lower convex edge is arranged at the periphery of the mandrel lower than the limiting groove, the descending resistance of the rubber layer at the section of the limiting groove is obviously increased when the rubber layer descends due to the heavy pressure of the motor mounting seat, the pressure on the rubber layer below the lower convex edge is shared, and the heavy pressure on the rubber layer at the position is obviously reduced, so that the fatigue failure caused by the excessively fast rubber layer at the position due to the long-term heavy pressure under the high-frequency vibration environment is avoided.

2. Because the supporting wall with multi-stage partition walls is additionally arranged on the periphery of the tray, the rubber layer at the lower part of the rubber node can be compensated for rigidity in time in the process of fatigue failure gradually generated under the action of long-time high-frequency vibration and heavy pressure; meanwhile, the supporting wall plays a role in radially limiting deformation and expansion of the rubber layer at the lower part of the rubber node to a great extent, and the service life of the rubber node can be obviously prolonged.

Drawings

FIG. 1 is an axial cross-sectional view of a rubber node according to one embodiment;

FIG. 2 is an axial cross-sectional view of the rubber node of example two;

FIG. 3 is a schematic cross-sectional view of a mounting hole in the motor mount;

FIG. 4 is an axial cross-sectional view of the rubber node of example III;

FIG. 5 is an axial cross-sectional view of a support wall on the tray according to the third embodiment;

FIG. 6 is a partial schematic view of FIG. 4, showing mainly that the support wall and the bulge surface of the bulge section are kept in a non-interfering gap when no significant fatigue change is generated in the bulge section of the rubber layer at the initial stage of using the rubber node;

FIG. 7 is a schematic cross-sectional view of the support wall and the swage section of the rubber layer according to the third embodiment, showing the first swage section being initially contacted by the first surface of the first partial wall when the first swage section is swaged and expanded;

FIG. 8 is a continuation of FIG. 7 showing the first expander section beginning to contact the minor pressing surface of the first divider wall as it continues to deform and expand;

FIG. 9 is a schematic partial cross-sectional view of the support wall and rubber node of the third embodiment, showing the first wall segment of the support wall contacting the first expanded segment that begins to deform and expand, beginning to limit the continued expansion of the rubber body of the first expanded segment, while providing compensating support for the beginning loss of stiffness of the inflated segment;

fig. 10 is a schematic partial cross-sectional view of the supporting wall and the rubber node according to the third embodiment, which is a continuation view of fig. 9, and shows that as the whole of the pressure-expansion section continues to deform and expand, the second sub-wall of the supporting wall begins to contact the second expansion section, and the first sub-wall and the second sub-wall respectively play a certain role in limiting the continuous expansion of the rubber bodies of the first expansion section and the second expansion section, and simultaneously provide compensation support for the stiffness of the continuous loss reduction of the pressure-expansion section;

fig. 11 is a schematic partial cross-sectional view of the supporting wall and the rubber node according to the third embodiment, which is a continuation view of fig. 10, and shows that as the whole of the pressure-expansion section continues to deform and expand, the third dividing wall of the supporting wall starts to contact the third expansion section, and the first dividing wall, the second dividing wall, and the third dividing wall respectively play a certain role in limiting the continuous expansion of the rubber bodies in the first expansion section, the second expansion section, and the third expansion section, and simultaneously provide compensation support for the stiffness of the continued loss of the pressure-expansion section;

FIG. 12 is a schematic partial cross-sectional view of the supporting wall and rubber node of the third embodiment, which is a continuation of FIG. 11, showing the motor mount having been lowered into contact with the platen of the supporting wall as the entire press-expanding section continues to deform and expand, and beginning to provide stiffness-compensating support to the press-expanding section by the entire supporting wall;

fig. 13 is a photograph taken in the background art.

In the figure: 1. a mandrel; 11. an upper rib; 111. an upward slope surface; 12. a lower rib; 121. a lower slope surface; 13. a through hole; 2. a rubber layer; 21. pressing and expanding the surface; 211. a first expansion section; 212. a second expansion section; 213. a third expansion section; 22. a pressure expansion section; 23. a limiting groove; 231. a lower tank wall; 232. an upper tank wall; 3. a tray; 4. a support wall; 41. dividing the wall; 4111. a first dividing wall; 412. a second dividing wall; 413. a third bulkhead; 4101. pressing the dough firstly; 4102. secondary noodle pressing; 42. a steel control groove; 421. a first steel control groove; 422. a second rigidity control groove; 423. a third rigid control groove; 43. pressing the table; 44. a gap; 5. a motor mounting seat; 51. mounting holes; 6. a top tray; 7. and (4) bolts.

Detailed Description

The invention is further described with reference to the following examples and figures:

example one

As shown in fig. 1 and 3, an anti-fatigue rubber node with high bearing capacity comprises a vertical mandrel 1, an annular rubber layer 2 which is bonded with the mandrel 1 by vulcanization around the periphery of the mandrel 1, and a radially recessed limiting groove 23 arranged at the middle section of the periphery of the rubber layer 2; and a lower convex edge 12 which provides downward resistance for the rubber layer 2 at the section of the limiting groove 23 is arranged on the periphery of the mandrel 1 lower than the limiting groove 23. When the motor mounting seat is used, the rubber node is pressed into the mounting hole 51 of the motor mounting seat 5 in an axial direction, so that the inner wall of the mounting hole 51 is just tightly sleeved on the periphery of the bottom of the limiting groove 23 at the periphery of the rubber layer 2. Because the lower convex edge 12 is arranged on the periphery of the mandrel 1 which is lower than the limiting groove 23, the descending resistance of the rubber layer 2 at the section where the limiting groove 23 is located when the rubber layer 2 descends due to the heavy pressure of the motor mounting seat 5 is obviously increased, the pressure on the rubber layer 2 below the lower convex edge 12 is actually shared, the heavy pressure on the rubber layer at the position is obviously reduced, and the fatigue failure of the rubber layer at the position due to the long-term heavy pressure under the high-frequency vibration environment is avoided.

The lower convex rib 12 is provided with a downward slope surface 121 which is inclined upwards; the limiting groove 23 is provided with a lower groove wall 231 and a groove bottom; the thickness of the rubber layer 2 between the lower slope surface 121 and the lower groove wall 231 is larger than that of the rubber layer 2 between the groove bottom and the mandrel 1. This is provided to ensure the effect of the rubber layer 2 in suppressing vibration and absorbing stress.

Example two

As shown in fig. 2 and 3, the upper rib 11 is arranged symmetrically with the lower rib 12 on the periphery of the mandrel 1 higher than the limiting groove 23. The effect of this arrangement is that the rubber node can be fitted upside down.

The upper convex rib 11 is provided with an upward slope 111 which is inclined downwards; the limiting groove 23 is provided with an upper groove wall 232; the thickness of the rubber layer 2 between the upper slope surface 111 and the upper groove wall 232 is larger than that of the rubber layer 2 between the groove bottom and the mandrel 1.

EXAMPLE III

As shown in fig. 4, 5 and 6, a rubber layer 2 below the limit groove 23 is a compression and expansion section 22 of the rubber layer 2, the diameter of the upper part of the compression and expansion section 22 is larger than that of the lower end, and the outer peripheral surface of the compression and expansion section is a conical compression and expansion surface 21. The arrangement is mainly convenient for pressing the rubber node into the mounting hole of the motor mounting seat.

The rubber node is provided with a tray 3 which can be fixed at the bottom end of the mandrel 1 and used for supporting the bottom end of the rubber layer 2; the outer periphery of the tray 3 has an annular raised support wall 4, and during the initial stage of use, there is a gap 44 between the support wall 4 and the crush surface 21. The purpose of the support wall 4 is to give a corresponding stiffness compensation when the rubber layer expansion segment 22 expands radially, the segment begins to experience fatigue failure and its intended stiffness suffers a loss. In the initial stage of the application, the gap 44 between the support wall 4 and the bulge surface 21 is such that the designed stiffness of the bulge section 22 can be maintained independently without any influence of the support wall 4 when the bulge section has not been deformed and bulged out for a certain period of time (such as months, years or more than ten years) after the rubber joint is applied.

The support wall 4 is a rubber body bonded to the tray 3 by vulcanization.

As shown in fig. 5, the inner wall of the supporting wall 4 is provided with a plurality of layers of dividing walls 41, and V-shaped rigidity control grooves 42 for controlling the radial rigidity of the dividing walls 41 are arranged between the plurality of layers of dividing walls; the thickness from the top to the base of the partition wall 41 becomes gradually thicker from thinner. The V-shaped groove 42 integrally connects the base of the partition wall 41 to the support wall 4, and the base is separated from the support wall 4 by the upper portion. When the upper portion of the partition wall 41 is in contact with the bulging face 21 of the rubber layer bulging section 22, the partition wall 41 can vibrate together with the bulging section 22 without involving the support wall 4 as a whole. The support wall 4 is integrally involved, so that the rigidity of the pressure expansion section 22 is increased, and the effect of inhibiting the high-frequency vibration of the motor and the effect of buffering the downward vertical stress of the motor mounting seat are influenced. The thickness of the partition wall 41 from the top to the base is gradually increased from thin to thick, that is, the rigidity of the partition wall 41 is gradually increased from the top to the base.

As shown in fig. 5, 7 and 8, the inner side surface of each partition wall 41 is divided into an upper initial pressing surface 4101 and a lower secondary pressing surface 4102, and the distance between the initial pressing surface 4101 and the expansion surface 21 of each partition wall 41 is smaller than the distance between the secondary pressing surface 4102 and the expansion surface 21. This is so that the upper part of the wall with the lower stiffness first contacts the bulge surface 21 of the bulge section 22, since the initial stiffness reduction of the bulge section 22 by the rubber body is smaller. Along with the prolonging of the service time, the fatigue failure degree of the rubber body of the pressure expansion section 22 is increased, the rigidity reduction of the rubber body of the pressure expansion section 22 is increased, the pressure expansion surface 21 is further expanded to gradually contact the secondary pressure surface 4102 of the division wall 41, and the rubber body of the pressure expansion section 22 is correspondingly supported by the larger rigidity of the lower part of the division wall 41.

As shown in fig. 9, according to experiments and calculations, different magnitudes of the bulging surface 21 at different heights at the same time when the high load is pressed are determined, and a section in the middle of the bulging surface 21, which is slightly lower than the height of the lower rib 12, where the bulging magnitude of the bulging surface 21 is the largest is designated as a first bulging section 211 for convenience of description; secondly, the lower section of the pressure expansion surface 21 with smaller expansion amplitude is named as a second expansion section 212; in the case where the bulge surface 21 is not bound at all by the support wall 4, the upper section of the bulge surface 21 has the smallest bulge amplitude, which is designated as the third bulge section 213.

As shown in fig. 5, the partition wall 41 has three layers, which are divided into a first partition wall 411 at the middle layer, a second partition wall 412 at the lower layer, and a third partition wall 413 at the upper layer according to the order of contacting the pressure-swelling surface 21; the steel control grooves outside the first division wall 411, the second division wall 412 and the third division wall 413 are a first steel control groove 421, a second steel control groove 422 and a third steel control groove 423 respectively; the distance between the first partition wall 411 and the pressure expansion surface 21 is smaller than the distance between the second partition wall 412 and the pressure expansion surface 21, and the distance between the second partition wall 412 and the pressure expansion surface 21 is smaller than the distance between the third partition wall 413 and the pressure expansion surface 21. The top of the support wall 4 outside the third control groove 423 is provided with a pressing table 43 for finally supporting the motor mounting seat 5. The reason for this design is:

as shown in fig. 9, when the first swelling section 211 swells, even if the magnitude is small, it is proved that the rubber body of the section starts to fail in fatigue, the rigidity starts to decrease, it is difficult to continue to maintain the existing shape by the rigidity of itself, the vibration damping effect and the supporting force are further weakened, and the first swelling section 211 contacts with the first dividing wall 411, and the swelling of the rubber body of the first swelling section 211 is radially restricted by the first dividing wall 411 and the rigidity of the decrease is compensated. In the process, the motor mounting seat 5 begins to sink; the first stiffness controlling groove 421 starts to narrow.

As shown in fig. 10, as the service life increases, the fatigue failure of the rubber body of the expansion section 22 continues to increase, the stiffness continues to decrease, the first partition wall 411 fails to meet the stiffness required to support the expansion section 22, and the second expansion section 212 of the expansion surface begins to contact the second partition wall 412, radially limiting the expansion of the rubber body of the expansion section 22 along with the first partition wall 411 and compensating for the decreased stiffness. In the process, the motor mounting seat 5 continues to sink; the second stiffness controlling groove 422 begins to narrow and the first stiffness controlling groove 421 further narrows to close.

As shown in fig. 11, as the service life is further prolonged, the fatigue failure degree of the rubber body of the expansion section 22 is further increased, the rigidity is further reduced, the first and

second partition walls

411 and 412 can not meet the rigidity required for supporting the expansion section 22, the third expansion section 213 of the expansion surface is contacted with the third partition wall 413, and the expansion of the rubber body of the expansion section 22 is radially limited and the reduced rigidity is compensated together with the first and

second partition walls

411 and 412. In the process, the motor mounting seat 5 sinks further; the third wire control groove 423 starts to narrow, the second wire control groove 422 further narrows to close, and the first wire control groove 421 is completely closed.

As shown in fig. 12, as the service life is prolonged to near the end of the service life cycle of the rubber node, the first dividing wall 411, the second dividing wall 412 and the third dividing wall 413 cannot meet the rigidity required by the support expansion section 22, at this time, the motor mounting seat 5 sinks to the pressing platform 43 on the top of the support wall 4, the first steel control groove 421, the second steel control groove 422 and the third steel control groove 423 are all closed, and the rigidity of the rubber body loss of the expansion section 22 is compensated by the whole support wall 4.

As shown in fig. 9 to 12, in the above process, when the first and

second partition walls

411 and 412 do not satisfy the rigidity required for supporting the bulge section 22 and the first and second

rigidity control grooves

421 and 422 are closed, the amount of rubber expansion of the third bulge section 213 is maximized, and therefore, the distance between the third partition wall 413 and the bulge surface 21 is designed to be maximized.

As shown in fig. 4, as a conventional option, the mandrel 1 is a tubular body with an axial through hole 13, the top end of the mandrel 1 is provided with a top plate 6, the centers of the tray 3 and the top plate 6 are both provided with threaded holes, a bolt 7 with external threads at two ends penetrates through the through hole 13 of the mandrel 1, and then the top plate 6 and the tray 3 are respectively screwed and fixed at the upper end and the lower end of the mandrel 1.

The above-described embodiments are intended to illustrate the invention more clearly and should not be construed as limiting the scope of the invention covered thereby, any modification of the equivalent should be considered as falling within the scope of the invention covered thereby.

Claims

1. The utility model provides an antifatigue rubber node with high bearing capacity, includes vertical dabber (1), around dabber (1) periphery through annular rubber layer (2) that vulcanizes and dabber (1) bond, the middle section of rubber layer (2) periphery is radial sunken spacing groove (23), its characterized in that: the periphery of the mandrel (1) lower than the limiting groove (23) is provided with a lower convex edge (12) which provides downward resistance for the rubber layer (2) at the section where the limiting groove (23) is located.

2. The fatigue resistant rubber node with high load bearing capacity of claim 1, wherein: the periphery of the mandrel (1) higher than the limiting groove (23) is provided with an upper convex rib (11) which is symmetrically arranged with the lower convex rib (12).

3. Fatigue-resistant rubber node with high load-bearing capacity according to claim 1 or 2, characterized in that: the lower convex rib (12) is provided with a downward slope surface (121) which is obliquely upward; the limiting groove (23) is provided with a lower groove wall (231) and a groove bottom; the thickness of the rubber layer (2) between the lower slope surface (121) and the lower groove wall (231) is larger than that of the rubber layer (2) between the groove bottom and the mandrel (1).

4. The fatigue resistant rubber node with high load bearing capacity of claim 3, wherein: one section rubber layer (2) below the limiting groove (23) is a pressure expansion section (22) of the rubber layer (2), the diameter of the upper part of the pressure expansion section (22) is larger than that of the lower end, and the outer peripheral surface of the pressure expansion section is a conical pressure expansion surface (21).

5. The fatigue-resistant rubber node with high bearing capacity according to claim 4, wherein: the rubber node is provided with a tray (3) which can be fixed at the bottom end of the mandrel (1) and used for supporting the bottom end of the rubber layer (2); the periphery of the tray (3) is provided with an annular raised support wall (4), and a gap (44) is arranged between the support wall (4) and the compression expansion surface (21) in the initial application period.

6. The fatigue-resistant rubber node with high bearing capacity according to claim 5, wherein: the support wall (4) is a rubber body bonded to the tray (3) by vulcanization.

7. The fatigue-resistant rubber node with high bearing capacity according to claim 6, wherein: the inner wall of the supporting wall (4) is provided with a plurality of layers of dividing walls (41), and V-shaped rigidity control grooves (42) for controlling the radial rigidity of the dividing walls (41) are arranged between the plurality of layers of dividing walls (41); the thickness from the top to the base of the dividing wall (41) is thickened from thin.

8. The fatigue resistant rubber node with high load bearing capacity of claim 7, wherein: the inner side surface of each partition wall (41) is divided into an upper initial pressing surface (4101) and a lower secondary pressing surface (4102), and the distance between the initial pressing surface (4101) and the compression and expansion surface (21) of each partition wall (41) is smaller than the distance between the secondary pressing surface (4102) and the compression and expansion surface (21).

9. The fatigue resistant rubber node with high load bearing capacity of claim 8, wherein: the dividing wall (41) is provided with three layers, and the three layers are divided into a first dividing wall (411) positioned in a middle layer, a second dividing wall (412) positioned in a lower layer and a third dividing wall (413) positioned in an upper layer according to the order of contact pressure expansion surfaces (21); the steel control grooves on the outer sides of the first partition wall (411), the second partition wall (412) and the third partition wall (413) are a first steel control groove (421), a second steel control groove (422) and a third steel control groove (423) respectively; the distance between the first partition wall (411) and the pressure expansion surface (21) is smaller than the distance between the second partition wall (412) and the pressure expansion surface (21), and the distance between the second partition wall (412) and the pressure expansion surface (21) is smaller than the distance between the third partition wall (413) and the pressure expansion surface (21).

10. The fatigue resistant rubber node with high load bearing capacity of claim 9, wherein: and the top of the supporting wall (4) outside the third rigid control groove (423) is provided with a pressing table (43) for finally supporting the motor mounting seat (5).