CN218085524U - Coupler knuckle and articulated coupler - Google Patents

Abstract

The application provides a coupler knuckle and articulated coupling, the coupler knuckle sets up the hook groove, the cell wall in hook groove includes the inner wrist, the inner wrist is equipped with first ending crack groove and second ending crack groove, first ending crack groove with the second ends crack groove and follows the length direction of coupler knuckle distributes, first ending crack groove with the second ends crack groove and is located respectively the both sides of inner wrist middle part position. The middle part of wrist in coupler knuckle body is the stress zone greatly, the crackle also extends to length direction's both sides after the middle part of wrist is sprouted easily, both sides in middle part position are provided with first crack arrest groove respectively, the second crack arrest groove, then when the crackle of sprouting expands to the crack arrest groove position that corresponds to both sides, first crack arrest groove, the second crack arrest groove can improve the stress concentration that local tensile stress effect produced at the crackle point end, make stress concentration obtain the release, can reduce the sharp moulding deformation accumulation of crackle end, thereby play the effect that delays crack propagation and extension coupler knuckle life-span.

Description

Coupler knuckle and articulated coupler

Technical Field

The utility model relates to a train part technical field, concretely relates to coupler knuckle and articulated type coupling.

Background

The coupler is one of the most basic and important parts of a railway vehicle, is arranged at two ends of the vehicle and is used for connecting the rolling stock and transmitting the longitudinal force of the train. At present, the coupler which is widely applied is a joint type coupler.

Referring to fig. 1 and 2, fig. 1 is a schematic view of a knuckle coupler; figure 2 is a schematic illustration of two articulated couplers shown in figure 1 coupled to each other.

The articulated coupler comprises a coupler body 200' and a coupler knuckle 100', wherein the coupler knuckle 100' is connected with the coupler body 200' through a pin 300 '. Knuckle 100 'may rotate about pin 300' to effect closure of the coupler while transferring traction and compression loads. As shown in fig. 2, the two knuckles 100' are hooked to each other. During the use process, the articulated coupler is easy to generate fatigue cracks.

SUMMERY OF THE UTILITY MODEL

The application provides a coupler knuckle, the coupler knuckle sets up the hook groove, the cell wall in hook groove includes the inner wrist, the inner wrist is equipped with first ending crack groove and second ending crack groove, first ending crack groove with the second ends crack groove and follows the length direction of coupler knuckle distributes, first ending crack groove with the second ends crack groove and is located respectively the both sides of inner wrist middle part position.

In one embodiment, the first anti-crack groove and the second anti-crack groove both extend along the width direction of the inner wrist.

In a specific embodiment, the first crack stop groove and the second crack stop groove are both arc-shaped grooves, and the distance between the circle center of the first crack stop groove and the circle center of the second crack stop groove and the distance between the circle center of the coupler knuckle and the coupler connecting line of the coupler knuckle are both between 18mm and 20 mm.

In a specific embodiment, the first crack stop groove and the second crack stop groove are symmetrically arranged with respect to a first center line extending in the width direction of the inner wrist.

In a specific embodiment, the distance between the first crack arrest groove and the second crack arrest groove is between 100mm and 120 mm.

In a specific embodiment, the depth of the first and second anti-crack grooves is between 10mm and 15 mm.

In one embodiment, the depth of the first and second crack stop grooves is gradually reduced from the middle in the width direction to both sides in the width direction.

In a specific embodiment, a groove wall of the hook groove comprises an S-surface for contacting the mating knuckle to transfer a traction load, the S-surface comprises an S-middle surface located at the middle part and a first S-side surface and a second S-side surface located at two sides of the S-middle surface along the length direction, the first S-side surface and the second S-side surface are inclined relative to the S-middle surface, and the S-middle surface is convex.

In a specific embodiment, the first and second anti-splinter slots are machined, cast or forged from the knuckle.

The application also provides an articulated car coupler, which comprises a coupler body and a coupler knuckle connected with the coupler body, wherein the coupler knuckle is the coupler knuckle described in any one of the above.

The inner wrist of the coupler knuckle body of the coupler knuckle in the application is provided with a first crack stopping groove and a second crack stopping groove which are arranged along the length direction, and the two crack stopping grooves are respectively located on two sides of the middle position of the inner wrist of the coupler knuckle. The middle part of the inner wrist of the coupler knuckle body is a large stress area, cracks can extend to two sides of the length direction easily after being initiated in the middle of the inner wrist, a first crack stopping groove and a second crack stopping groove are respectively arranged on two sides of the middle position in the embodiment, when the initiated cracks extend to the corresponding crack stopping grooves from two sides, the first crack stopping groove and the second crack stopping groove can improve the stress concentration generated by local tensile stress at the tip of the cracks, the stress concentration is released in a shaping mode, the deformation accumulation of the tip of the cracks can be reduced, and therefore the effects of delaying crack expansion and prolonging the service life of the coupler knuckle are achieved.

Drawings

FIG. 1 is a schematic illustration of a knuckle coupler;

FIG. 2 is a schematic illustration of two articulated couplers shown in FIG. 1 coupled to one another;

FIG. 3 is a schematic structural diagram of a knuckle of an articulated coupler according to an embodiment of the present application;

FIG. 4 is a side view of the knuckle of FIG. 3;

FIG. 5 is a force analysis of the knuckle of FIG. 4;

FIG. 6 is a front view of the knuckle of FIG. 3;

fig. 7 is a sectional view taken along line C-C in fig. 6.

The reference numbers in fig. 1-7 are illustrated as follows:

100' -knuckle; 200' -hook body; 300' -pin shaft;

100-knuckle;

101-knuckle neck; 1011-a first knuckle traction table; 1012-second knuckle traction table;

102-knuckle body; 102 a-hook groove; 102 b-pin hole; 1021-inner wrist; 1021 a-a first anti-splinter slot; 1021 b-a second anti-splinter slot; 1022-S face; 1022a-S middle face; 1022b — first S side; 1022 c-second S side.

Detailed Description

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

Referring to fig. 3-4, fig. 3 is a schematic structural diagram of a knuckle 100 of an articulated coupler according to an embodiment of the present application; fig. 4 is a side view of knuckle 100 of fig. 3.

The knuckle 100 includes a knuckle neck 101 and a knuckle body 1012, the knuckle neck 101 can be inserted into a hook (not shown), and both sides of the knuckle neck 101 in the length direction are provided with a first knuckle traction table 1011 and a second knuckle traction table 1012, and the knuckle is provided with a first knuckle traction table cooperating with the first knuckle traction table 1011 and a second knuckle traction table cooperating with the second knuckle traction table 1012. The coupler knuckle body 1012 of the coupler knuckle 100 is provided with a pin hole 102b, and the coupler knuckle 100 can rotate relative to the coupler body through a pin inserted into the pin hole 102b, and the length direction is parallel to the axial direction of the pin hole 102b, and when actually hooked, the length direction is also vertical.

In addition, the groove wall of the hook groove 102a of the knuckle 100 can be divided into an inner wrist 1021 and an S-surface 1022 as shown in fig. 4, wherein the S-surface, i.e., the corresponding groove wall, has an S-shaped cross section, as indicated by the dashed circle in fig. 4, and the inner wrist 1021 is closer to the knuckle neck 101. When the coupler knuckle 100 is hooked with another coupler knuckle 100 matched with the coupler knuckle 100, the other coupler knuckle 100 can be hooked into the coupler groove 102a, and the S-shaped surface 1022 of the coupler knuckle 100 and the S-shaped surface 1022 of the other coupler knuckle 100 are at least partially in contact fit with each other to achieve the purpose of transmitting the traction load, wherein the transmission path of the traction load is as follows: s-face 1022 of knuckle 100 → first and second knuckle traction stations 1011, 1012 → first and second hook body traction stations → the body of the hook body.

It is emphasized that the inner wrist 1021 of the knuckle body 102 in this embodiment is provided with crack stop grooves, including a first crack stop groove 1021a and a second crack stop groove 1021b shown in fig. 3, which are distributed along the length direction of the inner wrist 1021 of the knuckle body 1012.

As can be appreciated with continued reference to fig. 5, fig. 5 is a force analysis diagram of the knuckle 100 of fig. 4.

As shown in fig. 5, when the knuckle 100 receives a traction load, the S-surface 1022 and the knuckle traction table are subjected to an acting force and a reaction force which are equal in magnitude and opposite in direction, and the acting force and the reaction force are not on the same straight line, so that the inner wrist 1021 of the knuckle 100 is subjected to the bending moment M shown in fig. 5, and it is seen that the inner wrist 1021 of the knuckle 100 is actually a high-stress region and is subjected to a bending moment for a long time, and thus fatigue cracks described in the background art are likely to occur, and are high-incidence regions where the knuckle 100 is fatigue-broken.

The inner wrist 1021 of the knuckle body 102 in this embodiment is provided with a first crack arrest groove 1021a and a second crack arrest groove 1021b which are arranged along the length direction, and the two crack arrest grooves are respectively located at two sides of the middle position of the inner wrist 102 of the knuckle 100, specifically symmetrically arranged relative to a first center line X extending in the width direction. It can be known from the above description of the connection relationship that the traction load transmission path is transmitted from the S-surface 1022 to the knuckle traction tables at both sides of the knuckle neck 101, the knuckle neck 101 is located at the middle of the knuckle body 102 in the length direction, so the middle of the inner wrist 1021 of the knuckle body 102 is a high-stress area, and cracks are easily extended to both sides of the length direction after the middle of the inner wrist 1021 is initiated.

With continued reference to fig. 6, fig. 6 is a front view of knuckle 100 of fig. 3.

In this embodiment, the first crack arrest groove 1021a and the second crack arrest groove 1021b are located on two sides of the first center line X in the width direction of the knuckle 100, and the center line X is perpendicular to the length direction, as described above, because the middle part of the inner wrist 1021 of the knuckle 100 is a large stress region, if the first crack arrest groove 1021a and the second crack arrest groove 1021b are opened in the large stress region, the stress state of the inner wrist 1021 of the knuckle 100 may be deteriorated, the distance between the first crack arrest groove 1021a and the second crack arrest groove 1021b cannot be too small, and the crack arrest groove needs to avoid the large stress region in the middle part of the inner wrist 1021, and the large stress region is also a crack initiation region (i.e. a crack just begins to be generated), and the distance range between the first crack arrest groove 1021a and the second crack arrest groove 1021b should be larger than the crack initiation region of the inner wrist 1021, so as to control most of cracks generated in the range between the two crack arrest grooves, thereby effectively playing a crack arrest role.

By combining a large amount of engineering practice data, fatigue experiment data and stress theory calculation data, the distance a between the first crack arrest groove 1021a and the second crack arrest groove 1021b is set within the range of 100mm-120mm in the embodiment, and the crack initiation area is generally within the range of the first crack arrest groove 1021a and the second crack arrest groove 1021 b.

With continued reference to fig. 7, fig. 7 is a cross-sectional view taken along the line C-C in fig. 6.

On the groove wall surface of the hook groove 102a, the direction in which the S-surface 1022 extends toward the inner wrist 1021 may be defined as a first direction, in this embodiment, both the first crack arrest groove 1021a and the second crack arrest groove 1021b extend along the first direction, which is the width direction of the crack arrest groove, in fig. 3, the size of the first crack arrest groove 1021a and the second crack arrest groove 1021b in the width direction is obviously greater than the size in the length direction, the size in the length direction only needs to be sufficient to release the stress at the tip of the crack, and the size in the width direction needs to be considered to be capable of preventing the expansion of each crack in the path in the width direction in the middle area of the inner wrist 1021.

As shown in fig. 3, a second center line extending in the length direction of the inner wrist 1021 is defined, and the first crack arrest groove 1021a and the second crack arrest groove 1021b should extend to both sides of the second center line along the width direction, respectively, to prevent the crack from spreading. Referring to fig. 7 again, the crack arrest groove 1021a is an arc-shaped groove, the distance between the circle center O2 of the arc-shaped groove and the coupler connecting line L is H, the coupler connecting line L is located at a position (for example, 11mm in current engineering practice) away from the circle center O1 of the pin hole 102b by a certain distance D, and the distance H may be set to 18mm to 20mm, so that it can be determined that the extension section of the crack arrest groove 1021a in the width direction meets the requirement of preventing crack propagation, and of course, the range of the section can also be adjusted according to actual conditions.

In addition, the expansion rule of the inner wrist 1021 crack of the coupler knuckle 100 in the depth direction is comprehensively considered, the depth of the first crack arrest groove 1021a and the depth of the second crack arrest groove 1021B are guaranteed to be larger than the depth of the crack, so that the crack expansion can be effectively blocked, the depth B of the first crack arrest groove 1021a and the depth B of the second crack arrest groove 1021B can be set to be 10-15 mm by combining a large amount of engineering practice data, fatigue experiment data and stress theory calculation data, and similarly, the range of the interval can be adjusted according to actual conditions.

In addition, with continuing reference to fig. 7, in this embodiment, the first crack arrest groove 1021a and the second crack arrest groove 1021b are configured as arc-shaped grooves based on the surface shape of the inner wrist 1021, and the depth of the arc-shaped grooves gradually decreases from the middle to both sides in the width direction as seen in fig. 7, that is, the depth of the middle of the crack arrest groove 1021a is deepest, the middle of the crack arrest groove 1021a corresponds to the middle of the inner wrist 1021, which also corresponds to the depth rule of the crack, the depth of the crack in the middle region of the inner wrist 1021 is deepest, and it is desired to better prevent the crack from expanding, so the depths of the first crack arrest groove 1021a and the second crack arrest groove 1021b need to be larger than the depth of the crack, and when the crack expands to both sides in the width direction, the depth of the crack will decrease, and the depths of the first crack arrest groove 1021a and the second crack arrest groove 1021b can also decrease accordingly, which not only satisfies the purpose of preventing the crack from expanding, but also does not need to set too many deeper groove structures on the inner wrist 1021, and ensures the strength of the position of the inner wrist 1021.

Referring to fig. 3 and 6 again, in this embodiment, the S-surface 1022 of the knuckle body 1012 is not a straight surface along the length direction, two sides of the S-surface 1022 along the length direction are inclined relative to the middle, and the middle is relatively convex, so that the S-surface 1022 along the length direction can be divided into a first S-side surface 1022b, a second S-side surface 1022c, and an S-middle surface 1022a located at two sides, so that when the S-surfaces 1022 of two knuckles 100 are hooked and contacted, mainly the S-middle surface 1022a is contacted to transmit a traction load, and an area where cracks of the inner wrist 1021 propagate will be more concentrated on the middle of the inner wrist 1021, thereby facilitating to concentrate the initiated cracks between the first crack stopper 1021a and the second crack stopper 1021b, and achieving the purpose of preventing most or even all initiated cracks from continuing to propagate.

It is understood that, in fig. 3, only two crack stoppers are provided, i.e., the first crack stopper 1021a and the second crack stopper 1021b, respectively, and the propagation of the crack is reduced without deteriorating the internal stress state of the knuckle 100, and it is understood that, if allowed, the crack stoppers may be provided in other positions, or the crack stoppers 1021a may be provided in an arc-shaped groove extending in the width direction, or in a groove structure having another shape.

Further, the first crack stopper 1021a and the second crack stopper 1021b may be machined, cast, or forged from the knuckle 100.

The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (10)

1. The coupler knuckle is characterized in that the coupler knuckle is provided with a coupler slot, the slot wall of the coupler slot comprises an inner wrist, the inner wrist is provided with a first crack stopping slot and a second crack stopping slot, the first crack stopping slot and the second crack stopping slot are distributed along the length direction of the coupler knuckle, and the first crack stopping slot and the second crack stopping slot are respectively located on two sides of the middle position of the inner wrist.

2. The knuckle according to claim 1, wherein the first and second anti-splinter slots each extend along a width of the inner wrist.

3. The coupler knuckle according to claim 2, wherein the first crack stop groove and the second crack stop groove are arc-shaped grooves, and distances between centers of the first crack stop groove and the second crack stop groove and a coupler connecting line of the coupler knuckle are all between 18mm and 20 mm.

4. The knuckle according to claim 1, wherein the first and second crack stop grooves are symmetrically disposed with respect to a first center line extending in a width direction of the inner wrist.

5. The knuckle according to claim 4, wherein a spacing between the first and second crack stop grooves is between 100mm-120 mm.

6. The knuckle according to claim 1, wherein the depth of the first and second anti-splinter slots is between 10-15 mm.

7. The coupler knuckle according to any one of claims 1 to 6, wherein the first and second anti-splinter grooves have depths that gradually decrease from a widthwise middle portion to widthwise sides.

8. The knuckle according to any one of claims 1-6, wherein a wall of the knuckle includes an S-face for contacting a mating knuckle to transfer a traction load, the S-face including an S-center face in a middle portion along a length direction, and first and second S-side faces on both sides of the S-center face, the first and second S-side faces being inclined with respect to the S-center face, the S-center face being convex.

9. The knuckle according to any one of claims 1-6, wherein the first and second anti-splinter slots are machined, cast, or forged from the knuckle.

10. An articulated coupler comprising a coupler body and a knuckle connected to the coupler body, the knuckle being as defined in any one of claims 1 to 9.

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