阅读说明：本技术 一种机车转向架中央牵引装置及其使用的注塑尼龙衬套 (Central traction device of locomotive bogie and injection molding nylon bushing used by same ) 是由 宋华威 李传龙 曲松 张明超 秦美超 夏元华 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种机车转向架中央牵引装置用注塑尼龙衬套,注塑尼龙衬套包括水平部和竖直部,注塑尼龙衬套为双层衬套,其包括内层衬套和外层衬套；外层衬套接合到内层衬套的外圈；内层衬套的外圈设置有凹进；外层衬套的外圈周向地设置有用于贮存润滑脂的凹槽。本发明还公开了一种机车转向架中央牵引装置。本发明的双层注塑尼龙衬套,由于其特殊的结构(例如双层衬套、内层衬套与牵引销过盈配合、外层衬套的外圈设置有用于贮存润滑脂的凹槽且与外部配合的传力框发生相对转动等),避免了衬套的内外圈磨损和损坏,同时和牵引销的合理配合延长牵引销的使用寿命,提升了机车转向架中央牵引装置的可靠性。(The invention discloses an injection molding nylon bushing for a central traction device of a locomotive bogie, which comprises a horizontal part and a vertical part, wherein the injection molding nylon bushing is a double-layer bushing and comprises an inner layer bushing and an outer layer bushing; the outer bush is joined to the outer ring of the inner bush; the outer ring of the inner layer lining is provided with a recess; the outer ring of the outer bush is circumferentially provided with a groove for storing grease. The invention also discloses a central traction device of the locomotive bogie. Due to the special structure (such as the double-layer bushing, the inner-layer bushing is in interference fit with the traction pin, the outer ring of the outer-layer bushing is provided with the groove for storing lubricating grease and the force transmission frame matched with the outside rotates relatively, and the like), the double-layer injection molding nylon bushing avoids the abrasion and damage of the inner ring and the outer ring of the bushing, prolongs the service life of the traction pin by reasonably matching with the traction pin, and improves the reliability of a central traction device of a locomotive bogie.)

1. An injection molding nylon bushing for a central traction device of a locomotive bogie, which comprises a horizontal part and a vertical part, is characterized in that the injection molding nylon bushing is a double-layer bushing and comprises an inner layer bushing and an outer layer bushing; the outer liner is joined to the outer ring of the inner liner; the outer ring of the inner layer lining is provided with a recess; the outer ring of the outer layer bushing is circumferentially provided with a groove for storing lubricating grease.

2. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 1, wherein the inner ring of the outer layer bushing is provided with a protrusion that is form-fit with the recess; the recess is in positive engagement with the protrusion when the inner and outer liners are engaged.

3. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 2, wherein said recesses are concave keyways and the number of said recesses is two or four.

4. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 1, wherein said groove has a semi-circular cross-section.

5. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 4, wherein the outer ring of the outer layer bushing is circumferentially provided with two rings of grooves.

6. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 1, wherein said inner layer bushing is a steel ring bushing and said outer layer bushing is a nylon bushing.

7. The injection molded nylon bushing for a locomotive bogie center draft gear according to claim 2, wherein said nylon bushing is injection molded onto said steel ring bushing by one shot heat vulcanization.

8. A central traction device of a locomotive bogie comprises a traction pin, a retainer ring sleeved on the traction pin, an injection molding nylon bush according to any one of claims 1 to 7, a force transmission frame, a traction rubber pile arranged on the outer side surface of the force transmission frame, and a stop plate; the two symmetrically arranged injection molding nylon bushings are sleeved on the traction pin, and the stop plate is arranged at the bottom ends of the injection molding nylon bushings and the traction pin; the injection molding nylon bushing is characterized in that the outer layer bushing of the injection molding nylon bushing is in clearance fit with the force transmission frame and rotates relatively, and the inner layer bushing of the injection molding nylon bushing is in interference fit with the traction pin and does not rotate relatively.

9. The locomotive bogie central draft gear according to claim 8, wherein the horizontal portion of the injection molded nylon bushing is pressed against the retainer ring fitted over the draft pin, and the vertical portion of the injection molded nylon bushing is fitted over the draft pin.

10. The locomotive truck center draft gear according to claim 9, wherein the inner liner has a hardness of-10% to + 5% of the hardness of the kingpin.

Technical Field

The invention relates to the field of production and manufacture of locomotive bogie central traction devices, in particular to a locomotive bogie central traction device and an injection molding nylon bushing used by the same.

Background

The structural arrangement of the central traction device is commonly applied to locomotives and motor train units, wherein a bushing structure is arranged between a traction pin and a force transmission frame. The lining structure adopts nylon material more, and the main effect is for bearing longitudinal traction force and realizing the function of nimble rotation.

The existing bushing structure for the central traction device is formed by one-time vulcanization injection molding by using a manufacturing mold made of a nylon material with a small friction coefficient, and the whole structure is made of nylon. The inner ring of the bush is matched with the traction pin, and the outer ring of the bush is matched with the force transmission frame.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a central traction device of a locomotive bogie and an injection molding nylon bush used by the central traction device. The injection molding nylon bushing is reliable in installation and durable.

Based on the purpose, the following technical scheme is adopted:

according to the invention, the injection molding nylon bushing for the central traction device of the locomotive bogie is provided, the injection molding nylon bushing comprises a horizontal part and a vertical part, and is a double-layer bushing which comprises an inner layer bushing and an outer layer bushing; the outer bush is joined to the outer ring of the inner bush; the outer ring of the inner layer lining is provided with a recess; the outer ring of the outer layer lining is circumferentially provided with a groove for storing lubricating grease, so that relative friction is reduced, and the injection molding nylon lining and the force transmission frame matched with the outside are guaranteed to rotate relatively well.

Further, in order to avoid the tearing or relative rotation of the joint part of the outer layer lining and the inner layer lining, the inner ring of the outer layer lining is provided with a bulge matched with the concave shape; the recess and the projection are form-fittingly engaged when the inner and outer liners are engaged.

Further, the recess is concave keyway, and the quantity of recess is two or four to guarantee outer layer bush and inlayer bush close coupling.

Further, the cross section of the groove is semicircular.

Further, the outer ring of the outer layer bushing is circumferentially provided with two rings of grooves.

Further, the inlayer bush is the steel ring bush, and outer layer bush is the nylon bush.

Further, the nylon bush is injection molded onto the steel ring bush by one-time heat vulcanization.

According to the invention, the central traction device of the locomotive bogie comprises a traction pin, a check ring sleeved on the traction pin, the injection molding nylon bush, a force transmission frame, a traction rubber stack arranged on the outer side surface of the force transmission frame and a stop plate; two symmetrically arranged injection molding nylon bushings are sleeved on the traction pin, and the stop plate is arranged at the bottom ends of the injection molding nylon bushings and the traction pin; the outer layer lining of the injection molding nylon lining is in clearance fit with the force transmission frame and rotates relatively, and the inner layer lining of the injection molding nylon lining is in interference fit with the traction pin and does not rotate relatively. Structurally, as an organic whole after nylon bush and the towing pin assembly of moulding plastics, wholly realize with the relative rotation of power transmission frame, the effectual towing pin that has protected.

Furthermore, the horizontal part of the injection molding nylon bush is tightly pressed with the check ring sleeved on the traction pin, and the vertical part of the injection molding nylon bush is sleeved on the traction pin.

Further, the whole inner layer bushing is subjected to heat treatment to ensure that the hardness of the inner layer bushing is matched with the hardness of the matched traction pin, the hardness of the inner layer bushing is-10% to + 5% of the hardness of the traction pin, and abrasion caused by excessive hardness difference between the inner layer bushing and the traction pin is prevented.

The invention has the beneficial effects that:

the double-layer injection molding nylon bushing overcomes the defects of a similar bushing structure which totally adopts nylon in the prior art, for example, the bushing and a traction pin are easy to clamp and wear after long use; meanwhile, the repair process is difficult to disassemble, and the traction pin is easily damaged by forcible external force disassembly. Due to the special structure (such as the double-layer bushing, the inner-layer bushing is in interference fit with the traction pin, the outer ring of the outer-layer bushing is provided with the groove for storing lubricating grease and the force transmission frame matched with the outside rotates relatively, and the like), the double-layer injection molding nylon bushing avoids the abrasion and damage of the inner ring and the outer ring of the bushing, prolongs the service life of the traction pin by reasonably matching with the traction pin, and improves the reliability of a central traction device of a locomotive bogie.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some implementation examples of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural view of an injection molded nylon bushing of the present invention;

FIG. 2 is a side view (FIG. 2a) and a top view (FIG. 2b) of the inner liner of the injection molded nylon liner of the present invention;

fig. 3 is a schematic structural view of a central traction device of a locomotive bogie according to the present invention.

List of reference numerals

1-a towing pin; 2-injection molding a nylon bush; 3-a force transmission frame; 4-pulling the rubber pile; 5-stopping the plate; 21-outer layer lining; 22-inner liner; 23-injection molding the horizontal portion of the nylon bushing; 24-injection molding the vertical portion of the nylon bushing; 25-a groove; 26-recess; 27-bump; 28-a retainer ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.

Fig. 1 shows a structural schematic diagram of an injection-molded nylon bushing for a central traction device of a locomotive bogie. The injection-molded nylon bush 2 comprises a horizontal part 23 and a vertical part 24, and the injection-molded nylon bush 2 is a double-layer bush which comprises an inner-layer bush 22 and an outer-layer bush 21; the outer bush 21 is joined to the outer ring of the inner bush 22.

As shown in fig. 2, the outer race of the inner liner 22 is provided with a recess 26; in order to avoid the joint of the outer layer liner 21 and the inner layer liner 22 from tearing or rotating relatively, the inner ring of the outer layer liner 21 is provided with a bulge 27 which is matched with the concave 26 in shape; when the inner liner 22 and the outer liner 21 are engaged, the recesses 26 are in positive engagement with the projections 27. Preferably, the recess 26 is a female keyway; in fig. 2b it is shown that the number of recesses 26 is four to ensure that the outer liner 21 and the inner liner 22 are tightly coupled. Preferably, the number of recesses 26 may be two.

The outer ring of the outer layer bush 21 is circumferentially provided with a groove 25 for storing lubricating grease, so that relative friction is reduced, and the injection molding nylon bush 2 and the force transmission frame 3 matched with the outside are guaranteed to rotate relatively well. Preferably, the cross-section of the groove 25 is semicircular. The grease is preferably a solid grease. The outer ring of the outer bush 21 is circumferentially provided with two rings of grooves 25.

Preferably, the inner liner 22 is a steel ring liner and the outer liner 21 is a nylon liner. The nylon bush is subjected to one-time heat vulcanization injection molding on the steel ring bush, a certain allowance is reserved after the whole injection molding is finished, and then machining of the surface of the nylon bush is carried out to ensure the precision and the size, so that the size precision of the nylon bush meets the requirement and two rings of grooves 25 are further processed on the outer ring of the nylon bush.

Fig. 3 shows the structure of the central traction device of the locomotive bogie, wherein the injection-molded nylon bushing 2 mainly bears longitudinal traction force and realizes the function of flexible rotation.

The central traction device of the locomotive bogie comprises a traction pin, a check ring sleeved on the traction pin 1, the injection molding nylon bush 2, a force transmission frame 3, a traction rubber pile 4 and a stop plate 5; the cross-sectional shape of the injection molding nylon bush 2 is T-shaped.

The two nylon bush 2 covers of moulding plastics that use the symmetry to set up establish the upper portion and the lower part at towing pin 1, and the nylon bush 2 of moulding plastics that sets up on the upper portion of towing pin 1 is positive T shape setting, and the nylon bush 2 of moulding plastics that sets up in the lower part of towing pin 1 is the setting of falling T shape. The horizontal part 23 of the injection molding nylon bush 2 is tightly pressed with a check ring 28 sleeved on the traction pin 1; the vertical part 24 of the injection molding nylon bush 2 is sleeved on the traction pin 1. The bottom of nylon bush 2 and towing pin 1 is being moulded plastics to the setting of ending board 5 to with bolt and towing pin fastening connection, the size of ending board 5 is unanimous with the terminal surface size of the bottom of moulding plastics nylon bush 2 and towing pin 1 cooperation back. The retainer ring 28 and the stop plate 5 secure the two injection molded nylon bushings 2 to the traction pin at the upper and lower portions of the two injection molded nylon bushings 2, respectively. The force transmission frame 3 is shaped as a cuboid with a cylindrical through hole in the middle for receiving the injection molded nylon bush 2. The top and the bottom of the cylindrical through hole of power transmission frame 3 all set up the round recess, and this recess is used for receiving the horizontal part of the nylon bush 2 of moulding plastics and plays the effect of will passing power frame 3 joint to the nylon bush 2 of moulding plastics, realizes the vertical fixed of power transmission frame 3. The cylindrical through hole of the force transmission frame 3 extends into the recess formed by the horizontal part and the vertical part of the injection molding nylon bush 2, but the two are not in contact with each other to ensure the rotation of the injection molding nylon bush 2 relative to the force transmission frame 3. The force transmission frame 3 realizes vertical fixation and relative circumferential rotation of the injection molding nylon bush 2 through the matching structure of two injection molding nylon bushes 2 which are arranged in the cylindrical through hole and the stop plate 5 at the lower part. The periphery of the force transmission frame 3 is provided with four surfaces, the traction rubber stacks 4 are arranged on 2 symmetrical outer side surfaces, and the other two outer side surfaces of the force transmission frame 3 are provided with transverse baffles (not shown) for limiting. Wherein, the traction rubber pile 4 and the transverse baffle are fastened to the force transmission frame 3 in a bolt matching mode.

The outer layer bush 21 of the injection molding nylon bush 2 is in clearance fit with the force transmission frame 3 and rotates relatively, and the inner layer bush 22 of the injection molding nylon bush 2 is in interference fit with the traction pin 1 and does not rotate relatively. Structurally, as an organic whole after nylon bush 2 of moulding plastics and towing pin 1 assembly, the whole relative rotation that realizes and pass power frame 3 has effectually protected towing pin 1.

The inner liner 22 is heat treated throughout to ensure that it matches the hardness of the associated kingpin 1, the hardness of the inner liner 22 being-10% to + 5% of the hardness of the kingpin 1, preventing wear of the inner liner 22 and the kingpin 1 due to excessive hardness differences.

The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.