Patent Description:
The present application relates to the technical field of rail trains, in particular to a traction beam for a rail train and a traction device.

There are many types of traction devices for a rail train, which are generally divided into a single-pull-rod traction device and a double-pull-rod traction device.

The single-pull-rod traction device is provided with only one traction pull rod. One end of the traction pull rod is connected with a traction pin seat, and the other end of the traction pull rod is connected with a frame. By the traction device, an anti-side-rolling device is difficult to be arranged and the requirements for a vehicle to pass through a small curve are difficult to be met.

The double-pull-rod traction device is provided with two traction pull rods, and the two traction pull rods are respectively connected with two ends of a traction beam. By the traction device, the requirements for a vehicle to pass through a small curve can be met, and the arrangement of an anti-side-rolling device does not be affected. However, the large self-weight of the double-pull-rod traction device requires high structural strength of the vehicle, which limits the application of the double-pull-rod traction device.

Therefore, it is necessary to lighten the double-pull-rod traction device. However, how to achieve lightweight while still ensuring structural strength is a difficult problem for those skilled in the art.

<CIT> provides a supporting platform of a tower drum and a wind generating set. The supporting platform comprises a bottom frame, a top frame and a supporting plate. The bottom frame is supported on a foundation surface in the tower. The top frame is mounted on the bottom frame and supported by the bottom frame. The platform panel is laid on the top frame. The top frame comprises a left side frame, a right side frame and a plane frame, wherein the plane frame is used for connecting the left side frame and the right side frame at the upper part, and the plane frame is detachable.

<CIT> relates to a draw gear of a rapid speed wagon bogie. The draw gear of the rapid speed wagon bogie is characterized by comprising a center plate traction center pin, wherein a connecting disc is arranged on the top portion of the center plate traction center pin, a boss hole and a plurality of connecting holes are arranged on the top portion of the connecting disc, the bottom portion of the connecting disc is connected with a reversed trapezoid, flange plates are respectively arranged on the two sides of the reversed trapezoid, the reversed trapezoid is connected with a conical shaft, the conical shaft is connected with a positioning shaft table, the positioning shaft table is connected with a short shaft, two shock absorber seats are respectively connected with the two flanges plates, a connecting sleeve is arranged in the middle of a draw pull rod connecting seat, U-type seats and transverse backstop seats are respectively arranged on the two ends of the draw pull rod connecting seat, an upper port and a lower port of the connecting sleeve are respectively connected with an upper end cover and a lower end cover, each U-type seat is relatively provided with a transverse through hole, a pin hole is arranged in the middle of the transverse through hole, hinged holes are symmetrically arranged on the two ends of a draw pull rod, a rotating shaft is run through in each hinged hole, a draw seat node group is sleeved on the conical shaft and is arranged in the connecting sleeve, and a sleeve and a locking sleeve of the draw seat locking device are orderly sleeved in the short shaft, and are locked and fixed through locking nuts. The draw gear of the rapid speed wagon bogie can be widely applied for manufacture of rapid railway wagons.

<CIT> discloses a central traction device. The central traction device comprises a traction pin used for being connected with a vehicle body sleeper beam. The flat traction beam is connected with the traction pin. The two traction pull rods are arranged on the two sides of the traction beam respectively, are arranged on the same horizontal plane with the traction beam and are used for being connected with a bogie frame. The traction pin is provided with a preset installation space which is located in the traction pin and used for containing the traction beam and the two traction pull rods.

In order to solve the above technical problem, a traction beam for a rail train is provided according to the present application, the traction beam includes an intermediate body and two end bodies which are arranged at two ends of the intermediate body, a pin sleeve hole for mounting a central pin sleeve is defined in the intermediate body, a pull rod hole for connecting a traction pull rod is defined in each end body; each end body includes a main body portion, a cross-sectional area of the main body portion is decreased along a length direction of the traction beam; one end, having a larger cross-sectional area, of the main body portion is connected with the intermediate body; a curved surface portion is provided on a side surface of the intermediate body; the side surface of the intermediate body is in a smooth transition with a side surface of the main body portion by means of the curved surface portion of the intermediate body. Part of the side surface on one side of the main body portion is recessed inward to form a notch groove, the notch groove extends to an end surface of an end, away from the intermediate body, of the main body portion and extends from a top surface to a bottom surface of the main body portion, and a side wall and an end wall of the notch groove are in a smooth transition.

In an embodiment, a first curved surface portion which is recessed inward and a second curved surface portion which protrudes outward are provided on the side surface of the intermediate body, the side surface of the intermediate body is in a smooth transition with the side surface of the main body portion at one end by means of the first curved surface portion of the intermediate body, and is in a smooth transition with the side surface of the main body portion at the other end by means of the second curved surface portion of the intermediate body; the side surface on one side of the main body portion is in a smooth transition with the first curved surface portion of the side surface on one side of the intermediate body, and the side surface on the other side of the main body portion is in smooth transition with the second curved surface portion of the side surface on the other side of the intermediate body. The side surface of the traction beam is substantially S-shaped by providing the first curved surface portion which is recessed inward and the second curved surface portion which protrudes outward, so that the length of the pull rod is increased, and the compression amount of the pull rod node under the same rotation angle is reduced, which is beneficial to improving the service life of the pull rod node.

In an embodiment, a distance between a top surface and a bottom surface of the traction beam is relatively small, and a high-strength flat structure is used by the whole traction beam, so as to provide a space for the mounting of an anti-side-rolling torsion bar and other component of a bogie to avoid collision. The distance between the traction pull rod and the vehicle body is reduced, which is beneficial to lightweight design while ensuring the strength of the traction pin.

In an embodiment, a first weight reduction holes and a second weight reduction hole are defined in the intermediate body; the first weight reduction hole is arranged close to the pin sleeve hole, the second weight reduction hole is arranged close to the corresponding end bodies, and a reinforcing rib is formed between the first weight reduction hole and the second weight reduction hole.

In an embodiment, each end body includes a connecting sleeve, the connecting sleeve is connected with an end, away from the intermediate body, of the main body portion by means of a circumferential surface of the connecting sleeve, two pull rod holes are defined in each end body, one pull rod hole is defined in the main body portion, and the other pull rod hole is an inner hole of the connecting sleeve.

In an embodiment, the two pull rod holes are distributed along the length direction of the traction beam.

In an embodiment, a lifting stop is provided on the traction beam, and a connecting hole for connecting an adjusting cushion block is defined in the lifting stop.

In an embodiment, the traction beam has a central symmetric structure, a symmetrical center is a midpoint of a central axis of the pin sleeve hole, and an annular groove and a step surface facing the annular groove are provided on a hole wall of the pin sleeve hole.

A traction device is further provided according to the present application, which includes a traction beam, a central pin sleeve, a central pin, two traction pull rods, an elastic snap ring and a fastening assembly; the traction beam is the traction beam according to the above embodiment; the central pin sleeve is mounted in the pin sleeve hole, the elastic snap ring is mounted in the annular groove, one end of the central pin sleeve abuts against the step surface, the other end of the central pin sleeve abuts against the elastic snap ring, the central pin is mounted in an inner hole of the central pin sleeve and is fastened with the central pin sleeve by the fastening assembly, and the two traction pull rods are respectively connected to pull rod holes at the two ends of the traction beam.

In an embodiment, the fastening assembly includes a bolt, a pressure cover and a gasket, the central pin has a conical portion with an internal threaded hole, the inner hole of the central pin sleeve is a conical hole, the conical portion inserts into the conical hole, the bolt passes through the pressure cover and is screwed into the internal threaded hole, the pressure cover tightly abuts against the central pin sleeve under the fastening force of the bolt, and the conical portion tightly abuts against a hole wall of the conical hole.

The traction beam and the traction device provided by the present application are light in weight and high in structural strength, can fully satisfy bearing requirements, is small in size and small in occupied vertical mounting space, and does not affect the arrangement of an anti-side-rolling device.

Reference numerals in the drawings are listed as follows:.

In order to enable those skilled in the art to better understand the technical solutions provided by the present application, the technical solutions of the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in the figure, a traction device <NUM> for a rail train according to the present application includes a traction beam <NUM>. The traction beam <NUM> includes an intermediate body <NUM> and two end bodies <NUM> which are arranged at two ends of the intermediate body <NUM>.

A pin sleeve hole <NUM> is defined in the traction beam <NUM>, and the pin sleeve hole <NUM> is further defined in the intermediate body <NUM>. The traction beam <NUM> may have a central symmetric structure, a symmetrical center is a midpoint of a central axis of the pin sleeve hole <NUM>, in other words, a left half (viewed from the perspective of <FIG>) of the traction beam <NUM> can completely coincide with a right half of the traction beam <NUM> by rotating by <NUM>° around the central axis of the pin sleeve hole <NUM>.

The pin sleeve hole <NUM> axially extends from a top surface to a bottom surface of the intermediate body <NUM>. As shown in <FIG>, an annular groove <NUM> and a step surface <NUM> facing the annular groove <NUM> are provided on a hole wall of the pin sleeve hole <NUM>. In order to facilitate assembly, the annular groove <NUM> may be arranged close to the top surface of the intermediate body <NUM>, and the step surface <NUM> may be arranged close to the bottom surface of the intermediate body <NUM>.

A thickness of one end of the intermediate body <NUM> may be the same with a thickness of one end, connected with the intermediate body <NUM>, of the end body <NUM>. From the perspective of <FIG>, the thickness of the right end of the left end body <NUM> is the same with the thickness of the left end of the intermediate body <NUM>, and the thickness of the left end of the right end body <NUM> is the same with the thickness of the right end of the intermediate body <NUM>.

Weight reduction holes may be defined in the intermediate body <NUM>, so as to reduce the weight of the traction beam <NUM>. Specifically, a first weight reduction hole <NUM> may be arranged close to the pin sleeve hole <NUM>, a second weight reduction hole <NUM> may be arranged close to the corresponding end bodies <NUM>, and a reinforcing rib <NUM> is formed between the first weight reduction hole <NUM> and the second weight reduction hole <NUM>, so that the strength of the intermediate body <NUM> is enhanced while the weight is reduced. Preferably, the reinforcing rib <NUM> is arranged parallel to a width direction of the traction beam <NUM> (that is, a longitudinal direction of the rail train), so that the traction force can be guided to be transmitted on the reinforcing rib <NUM> in a straight line, thereby avoiding generating a large bending moment on the reinforcing rib <NUM>.

Curved surface portions (a1 and a2 shown in the figure) may be provided on a side surface of the intermediate body <NUM>. The side surface of the intermediate body <NUM> is in a smooth transition with a side surface of the end body <NUM> by means of the curved surface portion of the intermediate body <NUM>. With this design, the overall strength of the traction beam <NUM> is high and can fully meet the stress requirements.

In the illustrated solution, a first curved surface portion a1 which is recessed inward and a second curved surface portion a2 which protrudes outward are provided on the side surface of the intermediate body <NUM>, so that the side surface of the intermediate body <NUM> is substantially S-shaped. The side surface of the intermediate body <NUM> is in a smooth transition with the side surface of the end body <NUM> at one end by means of the first curved surface portion a1 of the intermediate body <NUM>, and is in a smooth transition with the side surface of the end body <NUM> at the other end by means of the second curved surface portion a2 of the intermediate body <NUM>. Such design can further enhance the strength and bearing capacity of the intermediate body <NUM>.

A pull rod hole <NUM> is defined in the traction beam <NUM>, and the pull rod hole <NUM> is further defined in the end body <NUM>. Each end body <NUM> includes a main body portion <NUM>, and may further include a connecting sleeve <NUM>. The connecting sleeve <NUM> is connected to an end, away from the intermediate body <NUM>, of the main body portion <NUM> by means of a circumferential surface of the connecting sleeve <NUM>. As shown in the figure, two pull rod holes <NUM> are defined in each end body <NUM>, one pull rod hole <NUM> is defined in the main body portion <NUM>, and the other pull rod hole <NUM> is an inner hole of the connecting sleeve <NUM>. Axes of the two pull rod holes <NUM> both extend along the width direction of the traction beam <NUM> (that is, the longitudinal direction of the rail train), and the two pull rod holes <NUM> are distributed along a length direction of the traction beam <NUM> (that is, a transverse direction of the rail train). Since the pull rod holes <NUM> extend along the transverse direction, a thickness of the traction beam <NUM> does not need to be arranged too thick, without occupying too much vertical mounting space.

A cross-sectional area of the main body portion <NUM> shrinks along the length direction of the traction beam <NUM>, and the main body portion <NUM> has a wedge shape as a whole. An end, having a larger cross-sectional area, of the main body portion <NUM> is connected with the intermediate body <NUM>. Specifically, a distance between two side surfaces of the main body portion <NUM> may shrink along the length direction of the traction beam <NUM>, and/or, a distance between the top surface and the bottom surface of the main body portion <NUM> may shrink along the length direction of the traction beam <NUM>. The main body portion <NUM> with such structure is beneficial to the lightweight of the traction beam <NUM>.

The side surface of the main body portion <NUM> is in a smooth transition with the side surface of the intermediate body <NUM>. In the illustrated solution, the side surface on one side of the main body portion <NUM> is in a smooth transition with the first curved surface portion a1 of the side surface on one side of the intermediate body <NUM>, and the side surface on the other side of the main body portion <NUM> is in a smooth transition with the second curved surface portion a2 of the side surface on the other side of the intermediate body <NUM>. Such design can further improve the overall strength of the traction beam <NUM>.

Specifically, part of the side surface on one side of the main body portion <NUM> is recessed inward to form a notch groove <NUM>, the notch groove <NUM> extends to an end surface of an end, away from the intermediate body <NUM>, of the main body portion <NUM> and extends from the top surface to the bottom surface of the main body portion <NUM>, and a side wall c1 and an end wall c2 of the notch groove <NUM> are in a smooth transition. In this way, the weight of the traction beam <NUM> can be further reduced, and the strength and bearing capacity of the end body <NUM> does not be greatly affected, which can still ensure that the strength and bearing capacity of the end body <NUM> meet the requirements.

A lifting stop <NUM> is provided on the traction beam <NUM>, and a connecting hole for connecting an adjusting cushion block <NUM> is defined in the lifting stop <NUM>. During lifting, adjustment cushion blocks <NUM> with different thicknesses can be connected to the lifting stop <NUM> as required. In the illustrated solution, the lifting stop <NUM> is integrated on the side surface of the intermediate body <NUM> and is located on a side of the weight reduction hole of the intermediate body <NUM>, which can play a stopping role, and further enhance the strength of the intermediate body <NUM>.

As shown in <FIG>, the traction device <NUM> further includes a central pin <NUM>, a central pin sleeve <NUM>, two traction pull rods (not shown in the figure), an elastic snap ring <NUM> and a fastening assembly.

The central pin sleeve <NUM> is mounted in the pin sleeve hole <NUM> of the traction beam <NUM>, a bottom end of the central pin sleeve <NUM> abuts against the step surface <NUM> of the pin sleeve hole <NUM>, the elastic snap ring <NUM> is mounted in the annular groove <NUM> of the traction beam <NUM>, a top end of the central pin sleeve <NUM> abuts against the elastic snap ring <NUM>, and the elastic snap ring <NUM> cooperates with the step surface <NUM> to fix an axial position of the central pin sleeve <NUM>.

One traction pull rod is connected to the pull rod hole <NUM> at one end of the traction beam <NUM> by the fastening assembly, the other traction pull rod is connected to the pull rod hole <NUM> at the other end of the traction beam <NUM> by the fastening assembly, and the two traction pull rods are respectively located on two sides of the traction beam <NUM>.

The central pin <NUM> is mounted in an inner hole of the central pin sleeve <NUM> and is fastened with the central pin sleeve <NUM> by the fastening assembly.

The central pin <NUM> includes a conical portion, and an internal threaded hole is defined in the conical portion. The inner hole of the central pin sleeve <NUM> is a conical hole which fits for the conical portion. The conical portion inserts into the conical hole, and an outer circumferential surface of the conical portion is in contact with a hole wall of the conical hole.

The fastening assembly includes a bolt <NUM>, a pressure cover <NUM> and a gasket <NUM>. The bolt <NUM> passes through the pressure cover <NUM> and is screwed into the internal threaded hole, the pressure cover <NUM> applies an abutting pressure toward a top side of the central pin sleeve <NUM> under the fastening force of the bolt <NUM>, and the conical portion tightly abuts against the hole wall of the conical hole, thereby realizing the fixing of the central pin <NUM>.

In summary, the traction beam <NUM> and the traction device <NUM> according to the present application are light in weight and high in structural strength, which can meet the bearing requirements.

Claim 1:
A traction beam for a rail train, wherein the traction beam (<NUM>) comprises an intermediate body (<NUM>) and two end bodies (<NUM>) which are arranged at two ends of the intermediate body (<NUM>), a pin sleeve hole (<NUM>) for mounting a central pin sleeve (<NUM>) is defined in the intermediate body (<NUM>), a pull rod hole (<NUM>) for connecting a traction pull rod is defined in each end body (<NUM>); wherein each end body (<NUM>) comprises a main body portion (<NUM>), wherein a cross-sectional area of the main body portion (<NUM>) is decreased along a length direction of the traction beam (<NUM>); one end, having a relatively large cross-sectional area, of the main body portion (<NUM>) is connected with the intermediate body (<NUM>); a curved surface portion is provided on a side surface of the intermediate body (<NUM>); the side surface of the intermediate body (<NUM>) is in a smooth transition with a side surface of the main body portion (<NUM>) by means of the curved surface portion of the intermediate body (<NUM>),
characterised in that part of the side surface on one side of the main body portion (<NUM>) is recessed inward to form a notch groove (<NUM>), the notch groove (<NUM>) reaches to an end surface of an end, away from the intermediate body (<NUM>), of the main body portion (<NUM>) and to a top surface and a bottom surface of the main body portion (<NUM>), and a side wall (c1) and an end wall (c2) of the notch groove (<NUM>) are in a smooth transition.