CN210591234U - Wheel pair for railway express wagon - Google Patents

Abstract

The utility model provides a wheel pair for railway express wagon, which comprises an axle, wheels and a brake disc, wherein the wheels and the brake disc are pressed on the axle, the axle is a solid axle, the diameter of a shaft neck is 130mm, the length of the shaft neck is 191mm, and the distance between a load center and a shaft shoulder is 101 mm; the diameter ratio of the wheel seat to the shaft body is 1.15; the wheel spoke is of a conical spoke structure, the rim tread is of an LM profile, the outer diameter of the hub is 270mm, and the thickness of the hub is 37 mm; the thickness of the rim is 50mm, the diameter of a rolling circle of the wheel is 915mm, the residual thickness of the rim corresponding to the abrasion limit is 23mm, the width of the rim is 135mm, and the distance between the inner hub and the rim is 18 mm. The utility model discloses for wheel pair of the same type, not only have the technical characterstic that intensity is high, light in weight, fatigue resistance can be good, can also improve swift freight train maintenance quality and availability factor, reduce swift freight train and overhaul the maintenance cost.

Description

Wheel pair for railway express wagon

Technical Field

The utility model relates to a transportation field, more specifically relates to a wheel pair for swift freight train of railway.

Background

With the development of social economy and the continuous acceleration of industrialization process, the industrial structure changes greatly, especially the development of new industries such as mechanical processing industry, electronics, chemical industry and the like, so that the transportation demand of products with high added value is increased rapidly, the transportation demands are small in batch and different in form and form, finished products or semi-finished products (such as mechanical parts, precision instruments, electronic products, medicines, medical equipment and the like), luggage and mails are mainly used, and higher requirements on aspects such as rapidness, safety, convenience and the like are provided.

Freight transportation is an important component of rail transportation, and vehicles for carrying freight on rails are collectively called rail wagons. It can be divided into general purpose trucks and special trucks according to their usage. The main types are boxcars, gondola cars, tank cars, flat cars and the like. In 2005, in order to improve the transport capacity of the universal lines in China, a series of universal trucks with an axle weight of 23t and a class of 70t were developed and popularized and applied all the way, and the production of the universal trucks with an axle weight of 21t and a class of 60t was completely stopped. 2003. In 2006, in order to further improve the east-west coal transportation capacity of China, special open trucks for transporting coal with axle weights of 25t C80 and C80B were developed, and heavy-duty trucks with axle weights of 30t (27t) have been developed in China. Since the 80 s in the 20 th century, the French railway has reached the maximum speed per hour of 140-160 km and the TGV high-speed postal train has reached the speed per hour of 270 km by means of measures such as fully accelerating the speed of a busy trunk line of freight and developing freight of a high-speed railway; the German railway drives the inter-city express freight train by using the running mode of the existing line and the high-speed railway; the rapid freight transportation in the United states emphasizes highways and aviation, and the speed per hour of the freight transportation of part of highways can reach 140 kilometers. In recent years, the demand for rapid freight transportation in countries around the world has increased considerably, as the business volumes of the largest two express enterprises in the united states, UPS and FedEx, have reached $ 469 million and $ 295 million, respectively, in 2005. The rapid freight transportation technology is developed vigorously and becomes one of two main development directions of the current world railway freight transportation, but certain gap exists between the technology of the type in China and the technology of foreign countries, wherein the key of technical innovation is to overcome the high-speed stability technology of a 160km/h rapid freight car bogie and realize the new breakthrough of the rapid technology.

The wheel set serving as a bogie running part is one of the key parts of a railway vehicle, and functions to transmit traction power by receiving various loads from a vehicle body and a rail. With the increase of the running speed of the railway vehicle or the increase of the load of a single vehicle, the requirement of ensuring that the wheel set has enough safety reliability and longer service life under the specified running condition puts higher and higher requirements on the development of related technologies such as the materials and the structures of wheels and axles of the wheel set.

SUMMERY OF THE UTILITY MODEL

In order to meet the requirements, the utility model discloses according to the "swift freight train of railway" notion that china's railway head office provided to "swift freight train of railway" shaft design is the technical support, adopts the thinking of top layer design, has designed a swift freight train of railway and has used the wheel set, and its operating speed is 160km/h, and this wheel set can be applied to the vehicle wheel pair of swift freight train of railway, also can be used to adopt other freight train wheel sets or passenger train wheel sets of reel braking mode.

The utility model provides a wheel pair for railway express wagon, including the axletree, wheel and the brake disc of pressure equipment on the axletree, the axletree is the solid axle that LZ45CrV material was made, and axle journal diameter is 130mm, and axle journal length is 191mm, and load centre-to-shoulder distance is 101 mm; the diameter ratio of the wheel seat to the shaft body is 1.15; the wheel spoke is of a conical spoke structure, the rim tread is of an LM profile, the outer diameter of the hub is 270mm, and the thickness of the hub is 37 mm; the thickness of the rim is 50mm, the diameter of a rolling circle of the wheel is 915mm, the residual thickness of the rim corresponding to the abrasion limit is 23mm, the width of the rim is 135mm, and the distance between the inner hub and the rim is 18 mm.

Furthermore, the axle adopts a shaft disc braking mode, and the number of the brake discs is 2.

Furthermore, the transition part of the axle body and the wheel seat adopts double-arc transition.

Furthermore, the shaft neck of the axle and the root of the dust guard seat outside the wheel seat are provided with unloading grooves.

Furthermore, the wheel is made of wheel steel made of CL65 material.

The utility model discloses for wheel pair of the same type, not only have the technical characterstic that intensity is high, light in weight, fatigue resistance can be good, can also improve swift freight train maintenance quality and availability factor, reduce swift freight train and overhaul the maintenance cost.

Drawings

Fig. 1 is a schematic structural view of a wheel set according to an embodiment of the present invention;

fig. 2 is a structural dimension view of an axle according to an embodiment of the present invention;

FIG. 3 is a calculated cross-sectional position diagram for an axle according to one embodiment of the present invention; and

fig. 4 is a structural dimension diagram of a wheel according to an embodiment of the present invention.

To clarify the structure of the embodiments of the present invention, specific dimensions, structures and devices are labeled in the figures, but this is only for illustrative purposes and is not intended to limit the present invention to the specific dimensions, structures, devices and environments, and those skilled in the art may adjust or modify the devices and environments according to specific needs, and the adjustment or modification is still included in the scope of the appended claims.

Detailed Description

The following describes in detail a wheel set for a railway express wagon according to the present invention with reference to the accompanying drawings and specific embodiments.

In the following description, it will be apparent to those skilled in the art that the present invention may be practiced with only some or all of the structures or processes of the present invention. For clarity of explanation, specific numbers, configurations and sequences are set forth, but it will be apparent that the invention may be practiced without these specific details. In other instances, well-known features have not been set forth in detail in order not to obscure the invention.

The utility model discloses a swift for freight train wheel pair of railway is for forming through the pressure equipment, comprises 3 essential elements, wheel 1, brake disc 2 and axletree 3 promptly, and wherein wheel 1 and brake disc 2 all adopt interference fit mode pressure equipment on axletree 3, and each regional concrete position is as shown in figure 1.

The wheel set for railway express wagon of the present invention will be specifically described with reference to fig. 2 to 4.

(1) Basic parameters of wheel pair

(2) Axle shaft

The axle design is based on the standard TB/T2705-:

the strength and bearing specification of the journal 4 are combined to determine the size of the journal 4, namely the diameter phi 130mm of the journal 4, the length 191mm of the journal 4 and the distance 101mm between the load center and the shaft shoulder.

The diameters of the wheel seat 6, the brake disc seat 8 and the shaft body 5 are determined according to the strength of each part, and the roots of the shaft neck 4 and the dust guard seat 7 are provided with unloading grooves 9.

The transition part 10 of the axle body 5 and the wheel seat adopts standard recommended double-circular-arc transition, namely R75mm and R15 mm; in the state of a newly-built axle, the diameter ratio of the wheel seat 6 to the axle body 5 reaches 1.15.

The main structural dimensions of the axle are shown in fig. 2, and the calculated cross-sectional position is shown in fig. 3. Wherein the section 1-1 is the junction of a straight line and an arc on the axle journal 4; the section 2-2 is the starting end of the dust guard seat, and the section 3-3 is the junction of the straight line and the circular arc of the dust guard seat; 4-4, the section is 10mm from the inner side of the wheel seat to the outer side; 5-5, the section is the junction of the circular arc and the straight line; the 6-6 section is 10mm from the outer side of the disc seat; the section of 7-7 is the junction of the circular arc and the straight line.

The axle stress calculations are shown in tables 1 and 2. The items in table 1 refer to stress values and safety factors of various sections calculated according to the TB/T2705-2010 standard based on the basic parameters of the wheel set, and TB/T2705-2010 is the method for designing non-moving shafts of railway vehicles, which is as shown in table 2.

TABLE 1 axle Strength results calculated according to TB/T2705-

TABLE 2 axle Strength results calculated in accordance with JIS E4501-

From the above calculation results, it can be seen that each part of the axle has a certain safety margin, which is basically more than 1.1, so the designed axle strength can meet the operating requirement of a 160km/h express truck.

(3) Wheel of vehicle

Wheel design is in accordance with the standard TB/T3463-:

the wheel structure is shown in fig. 4. In order to reduce the self weight, the wheel plate 11 of the wheel adopts a conical plate, and the material is CL65(CL65 is specially referred to the steel plate number of the wheel in the field). Tread 14 is of the type LM.

The main function of the hub 12 is to provide sufficient axle fastening force, so that the hub wall thickness should be as small as possible to reduce the mass of the wheel while ensuring axle fastening force. The thickness of the hub of the truck wheel is between 35mm and 40mm, according to experience, the outer diameter of the hub is set to be 270mm, and the thickness of the corresponding hub is 37 mm.

The thickness of the rim 13 is determined to be 50mm, the diameter of the rolling circle is 915, and the abrasion is carried out to the limit corresponding to the residual thickness of the rim of 23 mm. The rim width was 135 mm. The inner hub rim distance is 18 mm.

According to the provisions of UIC510-5-2007 standard, the wheel strength checking portion is a spoke plate, including the transition region of the spoke plate to a hub and a rim. Through finite element calculation, the maximum stress values of Mises in the assessment area under the linear working condition, the curve working condition and the turnout working condition are detailed in a table 3.

TABLE 3 wheel Mises stresses corresponding to each operating mode

Load condition	Position of	stress/Mpa
			Straight line operating mode	Hub transition zone	186
Curve regime	Transition arc area from inner radial plate to hub	230
			Operating mode of turnout	Transition arc area from outside spoke plate to hub	189
Ultra-long load condition	Transition arc area from inner radial plate to hub	256

The stress variation of the CL65 steel wheel was regulated to 360MPa in accordance with TB/T3463-2016. Table 4 shows the comparison between the design scheme and the existing wheel type, and the data shows that the fatigue strength performance of the design scheme is superior to that of the similar existing wheel.

TABLE 4 comparison of the design with the existing wheel types

(5) The tolerances and dimensions of the wheel sets are shown in the table below.

Wheel set geometric tolerance and dimension unit is millimeter

The wheel-set assembly method is as follows, and is also a method commonly used by those skilled in the art.

a. And (5) assembling the brake disc, wherein the brake disc assembling is required to meet the requirements of product patterns and technical files, the press-fitting pressure curve is required to be within the specified range of the patterns, and the press-fitting curve is recorded.

b. And in the wheel assembly, the static unbalance positions of two wheels of the same wheel pair are in the same plane and on the same side of the axle. The static unbalance position of the brake disc and the wheel is in the same plane and opposite to the static unbalance position of the wheel.

c. The interference magnitude is 0.08-0.15% of the diameter of the wheel seat.

d. The wheel axle press-fitting force and the wheel pair press-fitting pressure are calculated according to the diameter of the wheel hub hole, and the press-fitting force per 100mm is in accordance with the specification of the table 5.

TABLE 5 wheel set Assembly Press fitting force requirement

Axle material	Minimum pressing force TMin (kN)	Maximum press fit force TMax (kN)
			LZ45CrV steel	343	588

e. Dynamic balance, the maximum value of dynamic unbalance measured in the wheel plane is 75 g.m.

f. Dimensional and form and position tolerances:

the wheel diameter difference of the wheels is less than or equal to 0.5mm, the wheel position difference is less than or equal to 1mm, and the disk position difference is less than or equal to 1 mm.

The wheel diameter jump is measured at the rolling circle, and the diameter jump is less than or equal to 0.5 mm.

The end jump of the brake disc is measured at the position 30mm away from the diameter of the brake disc, and the end jump is less than or equal to 0.5 mm.

(6) The wheel set protection method is as follows, which is also a method commonly used by those skilled in the art.

Coating the shaft neck and the cutting part nearby the shaft neck, the plane of the hub, the installation and matching with other parts and the required part with a preservative; alkyd varnish or varnish is uniformly coated on the inner side and the outer side of the axle body and the wheel (the inner side and the outer side of the tread and the rim are not coated); the exposed surface of the brake disc hub, the non-friction surface, the non-mounting surface and the like of the brake disc should be uniformly coated with red alkyd enamel.

The journal portion should be protected with an effective protection to ensure that rust and bruising do not occur.

Finally, it should be noted that the above embodiments are only intended to describe the technical solution of the present invention and not to limit the technical method, the present invention can be extended to other modifications, changes, applications and embodiments in application, and all such modifications, changes, applications, embodiments are therefore considered to be within the spirit and teaching scope of the present invention.

Claims (5)

1. The utility model provides a wheel pair for railway express wagon, includes the axletree, presses the wheel and the brake disc on the axletree, its characterized in that: the axle is a solid axle made of LZ45CrV material, the diameter of a shaft neck is 130mm, the length of the shaft neck is 191mm, and the distance between a load center and a shaft shoulder is 101 mm; the diameter ratio of the wheel seat to the shaft body is 1.15; the wheel spoke is of a conical spoke structure, the rim tread is of an LM profile, the outer diameter of the hub is 270mm, and the thickness of the hub is 37 mm; the thickness of the rim is 50mm, the diameter of the rolling circle of the wheel is 915mm, the residual thickness of the rim corresponding to the abrasion limit is 23mm, the width of the rim is 135mm, and the distance between the inner hub and the rim is 18 mm.

2. The wheel set according to claim 1, characterized in that the axle adopts an axle disc braking mode, and the number of the braking discs is 2.

3. The wheel set according to claim 1, characterized in that the transition portion of said axle body and wheel seat is a double circular arc transition.

4. Wheel set according to claim 1, characterized in that the axle journal and the dust cup root outside the wheel seat of the axle are provided with relief grooves.

5. The wheel set according to claim 1, characterized in that said wheel is made of wheel steel of CL65 material.

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