Threaded interface buffer with anti-rotation structure

A threaded interface buffer with anti-rotation structure is provided, comprising a buffer housing (1), a buffer capsule (2) and a drawbar (3), wherein the drawbar (3) comprises a connection portion (4) connected to the buffer capsule (2); the drawbar (3) is in threaded connection to the buffer capsule (2) through the connection portion (4); and, a first level anti-rotation structure (5) for limiting the rotation of the drawbar (3) and the buffer capsule (2) is mounted thereon, and a second level anti-rotation structure (6) for limiting the rotation of the drawbar (3) and the buffer housing (1) is mounted therebetween, so that the versatility and adaptability of the buffer can be enhanced and the operational stability of the buffer is ensured.

TECHNICAL FIELD

The present invention relates to a buffer device for rail vehicle, and in particular to a buffer and an anti-rotation structure thereof.

BACKGROUND OF THE PRESENT INVENTION

The coupler buffer device is one of the most basic and important components of the vehicle. Its function is to connect the rail vehicle, slow down the longitudinal impact between the trains, and improve the ride comfort and the safety of the rail vehicle. The coupler buffer device is installed at the coupler joint between the vehicles. The length of the coupler buffer device varies depending on the design parameters, line conditions and operating conditions of different vehicles.

The buffer for a rail vehicle coupler buffer device is generally designed as a single integral component. In order to match the design requirements of the coupler buffer device of different lengths, the length of the buffer needs to vary with the length of the coupler buffer device. Therefore, buffers with the same parameters need to be designed with a variety of different lengths to accommodate different lengths of coupler buffer device.

Existing buffer structure typically includes a buffer capsule and a drawbar. Generally, the drawbar and the buffer capsule are designed as an integrated structure, so the length of the drawbar is fixed in the same buffer, and a new buffer is needed to replace when it is required to be used with different vehicles.

The Chinese patent with the publication No. CN201376575Y provides a magnetic levitation train head coupler buffer device, wherein the coupler buffer device is provided with a locking device, which is a locking bolt and a through hole provided on the mounting seat, and a threaded hole set on the buffer system pull ring, the locking bolt is fixed in the threaded hole through the through hole, and is fixed to the mounting seat by a nut.

SUMMARY OF THE PRESENT INVENTION

The object of the present invention is to provide a general-purpose, modular combination buffer structure to overcome the defects in the prior art that the buffer structure is integrated and the same buffer is not adapted to the different lengths of the coupler buffer device.

The technical solution of the present application is:

A threaded interface buffer with anti-rotation structure is provided, including a buffer housing, a buffer capsule and a drawbar. The buffer capsule is located inside the buffer housing. The drawbar includes a connection portion connected to the buffer capsule. The drawbar is in threaded connection to the buffer capsule through the connection portion. A first level anti-rotation structure for limiting the rotation of the drawbar and the buffer capsule is mounted on the drawbar and the buffer capsule.

Further, a second level anti-rotation structure for limiting the relative rotation of the drawbar and the buffer housing is mounted between the drawbar and the buffer housing, and the second lever anti-rotation structure covers the first level anti-rotation structure.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The present application will be described in detail below in combination with the specific implementations. It should be understood that the following technical solutions are not only a description of simple combination of the technical solutions; if the technical solutions can implement the corresponding technical functions through a reasonable combination, it is also within the protection scope of the present application.

A threaded interface buffer with anti-rotation structure is provided, including a buffer housing, a buffer capsule and a drawbar. The buffer capsule is located inside the buffer housing. The drawbar includes a connection portion connected to the buffer capsule. The drawbar is in threaded connection to the buffer capsule through the connection portion. A first level anti-rotation structure for limiting the rotation of the drawbar and the buffer capsule is mounted on the drawbar and the buffer capsule.

As an implementation, the first level anti-rotation structure is mounted at a junction between the drawbar and the buffer capsule, including a first anti-rotation hole formed on the drawbar and a second anti-rotation hole formed on the buffer capsule, which are collectively referred to as anti-rotation hole. The positions of the anti-rotation holes on the two components are matched with each other, and aligned with each other after mounted. An anti-rotation component is inserted into the anti-rotation holes to limit the rotation of the two components.

As a preferred embodiment, the anti-rotation component is an anti-rotation screw, and correspondingly, the inner walls of the first anti-rotation hole and the second anti-rotation hole are provided with internal threads. During the assembly, the anti-rotation screw is screwed into the anti-rotation holes.

As another preferred embodiment, the anti-rotation component is an anti-rotation pin. The diameters of the anti-rotation holes are matched with the outer diameter of the anti-rotation pin, so the anti-rotation pin is directly inserted into the anti-rotation holes.

As an implementation, a second level anti-rotation structure for limiting the relative rotation of the drawbar and the buffer housing might be mounted between the drawbar and the buffer housing, including an anti-rotation plate. One end of the anti-rotation is connected to the drawbar, while the other end thereof is connected to the buffer housing.

Preferably, at a mounting position of the anti-rotation plate, i.e., at a mounting position of a first mounting surface, an outer wall of the drawbar includes a first mounting part matched with the anti-rotation plate, with the first mounting part being a flat and straight mounting part; and, at a mounting position of the anti-rotation plate, i.e., at a mounting position of a second mounting surface, an outer wall of the buffer housing includes a second mounting part matched with the anti-rotation plate, with the second mounting part being also a flat and straight mounting part. The first mounting part and the second mounting part might be planes formed by machining the outer wall of the drawbar and the outer wall of the buffer housing, respectively, or might be planes welded to the outer wall of the drawbar and the outer wall of the buffer housing, respectively.

Preferably, the anti-rotation holes are located at a junction of the anti-rotation plate with the drawbar, and the anti-rotation plate covers the anti-rotation holes. Specifically, the anti-rotation holes may be formed at the first mounting part. With such a structure, the effect of covering the first level anti-rotation structure by the second level anti-rotation structure is realized, so that the anti-rotation component is prevented from falling off and the fall-off resistance and the dual anti-rotation effect are achieved.

Or, one end of the anti-rotation plate is embedded into the first mounting part of the drawbar and closely fitted with the drawbar.

As an implementation, an internal thread is provided in the connection portion, an external thread is provided on the buffer capsule, and the two are matched with and connected to each other by the internal thread and the outer thread. As another implementation, an external thread is provided in the connection portion, an internal thread is provided at a front end of the buffer capsule, and the two are matched with and connected to each other by the internal thread and the outer thread.

As a preferred implementation, the second mounting surface is independent from the anti-rotation plate and is connected to the second mounting part; and, one end of the anti-rotation plate is mounted on the first mounting part, while the other end thereof is located between the second mounting surface and the second mounting part.

The present application has the following beneficial effects.

(1) In the present application, the integrated structure of the drawbar and the buffer capsule in the existing buffer is improved. By improving the integrated structure of the drawbar and the buffer capsule in the prior art to a threaded fit manner, a buffer structure with combined modules is provided.

(2) In the present application, the structure of the drawbar is also improved. The drawbar includes a straight rod portion and a connection portion connected to the buffer capsule. Drawbars of different buffers are different in the length of the straight rod portion. When a buffer is applied to coupler buffer devices having different lengths, the versatility and adaptability of the buffer can be enhanced by replacing the drawbar. Moreover, since the drawbar is in spiral fit to the buffer capsule, it is convenient for replacement and the structure is flexible.

(3) In order to avoid the relative rotation between the buffer capsule and the drawbar and between the buffer housing and the drawbar, the first level anti-rotation structure and the second level anti-rotation structure are designed, respectively, so that the operational stability of the buffer is ensured.

(4) Since the anti-rotation component of the first level anti-rotation structure is an anti-rotation pin or an anti-rotation screw, the anti-rotation component is possible to fall off. In the present application, the anti-rotation plate in the second level anti-rotation structure may cover the first level anti-rotation structure, the anti-rotation component in the first level anti-rotation structure is prevented from falling off, and the anti-rotation function is further realized.

The present application will be further described with reference to the accompanying drawings, in order to improving the understanding of the present application by those skilled in the art. However, it should be understood that, elements, structures, and features of an embodiment may be beneficially incorporated into other embodiments without further recitation.

The embodiments are merely described for the preferred embodiments of the present application, and are not intended to limit the scope of the present application. Various modifications and improvements may be made by those skilled in the art to the technical solutions of the present application without departing from the spirit of the present application are intended to fall within the scope of protection defined by the claims of the present application.

In the description of the present application, it should be noted that, the terms “first level”, “second level”, “first”, “second” and the like are used for descriptive purpose only, and are not to be constructed as indicating or implying relative importance. Moreover, the use of the reference number in the present application is only for the understanding of the present application, and is not to be construed as limiting the corresponding technical solutions.

As shown inFIGS. 1, 4 and 5, a threaded interface buffer with anti-rotation structure is provided, comprising a buffer housing1, a buffer capsule2and a drawbar3. The drawbar3comprises a straight rod portion and a connection portion4connected to the buffer capsule. The drawbar3is in threaded connection to the buffer capsule2through the connection portion4. For example, an external thread is provided on an outer wall of the buffer capsule2, the connection portion4is sheathed outside the buffer capsule2, and an internal thread matched with the external thread on the outer wall of the buffer capsule2are provided on the connection portion4. In this case, the drawbar3is in threaded connection to the buffer capsule2. Alternatively, a connection structure containing an internal thread is designed at a junction of the buffer capsule2with the drawbar3, and correspondingly, an external thread matched with the internal thread of the buffer capsule2is designed at the connection portion4of the drawbar3, so that the threaded connection of the both can be realized. InFIG. 5, the first solution is employed, that is, an internal thread is provided in the connection portion4and an external thread is provided at one end of the buffer capsule2, so that the threaded connection of the connection portion4and the buffer capsule2is realized. This embodiment is mainly described referred to the first connection mode. The second connection mode is similar in structure and will not be repeated here.

In order to avoid the relative rotation of the drawbar3and the buffer capsule2during the operation process, a first level anti-rotation structure5for limiting the rotation of the drawbar3and the buffer capsule2is mounted thereon of the two.

More specifically, the first level anti-rotation structure5is mounted at a junction of the drawbar3and the buffer capsule2, comprising a first anti-rotation hole501that is an anti-rotation hole on the drawbar and a second anti-rotation hole502that is an anti-rotation hole on the buffer capsule. Specifically, since the connection portion4is sheathed outside the buffer capsule2, the connection portion4is of a sleeve-shaped structure, and the first anti-rotation hole501runs through the wall of the sleeve-shaped connection portion4. A second anti-rotation hole502matched with the position of the first anti-rotation hole501is also provided on the buffer capsule2, and the buffer capsule is fitted with the connection portion4on an inner side of the connection portion4. After mounted, the position of the first anti-rotation hole501and that of the second anti-rotation hole502are matched with and aligned to each other. The first anti-rotation hole and the second anti-rotation hole are generally formed by drilling after assembly. An anti-rotation component503is inserted into the first anti-rotation hole501and the second anti-rotation hole502. Accordingly, the fitting connection of the drawbar3and the buffer capsule2is reinforced, and the relative rotation between the both is avoided.

The anti-rotation component503may be an anti-rotation screw. Correspondingly, internal threads matched with the external thread of the anti-rotation screw are provided on inner walls of both the first anti-rotation hole501and the second anti-rotation hole502. By screwing into the screw, the drawbar3and the buffer capsule2are fixed.

As an alternative of the anti-rotation screw, the anti-rotation component503may also be an anti-rotation pin. Both the diameter of the first anti-rotation hole and the diameter of the second anti-rotation hole are matched with the outer diameter of the anti-rotation pin, so the fixation of the drawbar3and the buffer capsule2is realized as long as the anti-rotation pin is directly inserted into the first anti-rotation hole501and the second anti-rotation hole502.

Compared with the anti-rotation screw, the anti-rotation pin do not have any spiral fitting structure, so there is a fall-off risk. Therefore, the self-stability of the anti-rotation pin is low in comparison to the use of the anti-rotation screw. By using the horizontal plane where the center axis of the drawbar is located as a reference, the first anti-rotation hole501and the second anti-rotation hole502are arranged on a plane parallel to the horizontal plane, so that the hidden risk of falling off the anti-rotation pin may be overcome to a certain extent.

Based on Embodiment 1, as shown inFIGS. 1, 2 and 3, in order to further solve the problem of the relative rotation between the drawbar3and the buffer housing1, a second level anti-rotation structure6for preventing the relative rotation of the drawbar3and the buffer housing1is further mounted therebetween, comprising an anti-rotation plate609. One end of the anti-rotation plate609is connected to the drawbar3, while the other end thereof is connected to the buffer housing1. After assembled, the outer wall of the drawbar3and the outer wall of the buffer housing1are not located in the same horizontal plane, and there is a difference between upper and lower positions. A connection transition structure is further provided between mounting positions of two ends of the anti-rotation plate609with the drawbar3and with the buffer housing1. The shape of the connection transition structure will not be limited herein. As a transition between the two ends of the anti-rotation plate609, that the connection transition structure can connect two ends of the anti-rotation plate609is enough. In this embodiment, the connection transition structure is a vertical platy structure. The connection transition structure is not limited to the above structure. The specific structure of the connection transition structure may be related to the mounting environment as well as the length of the anti-rotation plate609connected to the drawbar3and the buffer housing1.

The specific mounting structure of the anti-rotation plate609with the buffer housing1and with the drawbar3is as follows: a flat and straight mounting part (i.e., a first mounting part601) matched with the anti-rotation plate609is designed on an outer wall of the drawbar3, at a position corresponding to the mounting position of the anti-rotation plate, i.e., the first mounting surface603; and, a straight mounting part (i.e., a second mounting part602) matched with the anti-rotation plate609is also designed on the outer wall of the buffer housing1, at a position corresponding to the mounting position of the other end of the anti-rotation plate, i.e., the second mounting part602. Correspondingly, both the first mounting part601and the second mounting part602are flat and straight mounting parts, which may be in close fit with the first mounting surface603and the second mounting surface604and provided with fastener mounting holes, respectively, e.g., a first mounting hole607and a second mounting hole608shown inFIG. 1, for mounting and fixing by a first fastener605and a second fastener606. The first mounting part601and the second mounting part602may be planes formed by machining the outer wall of the drawbar and the outer wall of the buffer housing, or may also be mounting grooves with planar bottoms formed by machining the outer wall of the drawbar and the outer wall of the buffer housing. With the above structure, the anti-rotation plate609may be stably mounted with the buffer housing1and the drawbar3.

As shown inFIGS. 1-3, the first mounting surface603may be one end of the anti-rotation plate609, and the second mounting surface604is a structure independent from the anti-rotation plate609and located above the other end of the anti-rotation plate609. That is, after mounted, the other end of the anti-rotation plate609is located between the second mounting surface604and the second mounting part602.

Furthermore, the anti-rotation plate609may assist in the fixation of the first level anti-rotation structure5. The first level anti-rotation structure5is provided at a junction of the anti-rotation plate609with the drawbar3, and the anti-rotation plate609covers the first level anti-rotation structure5. More specifically, the first level anti-rotation structure5is located at the first mounting part601of the drawbar3, that is, the anti-rotation nut or anti-rotation pin is resisted by the anti-rotation plate609. When the anti-rotation pin is used as the anti-rotation component501, the fall-off the anti-rotation pin may be effectively avoided by this structure.