CN111408149A

CN111408149A - Three-axis railway locomotive power model bogie and transmission device

Info

Publication number: CN111408149A
Application number: CN202010323265.0A
Authority: CN
Inventors: 赵邦立; 尚白宇
Original assignee: Shenzhen Wanlidaguan Electromechanical Information Technology Co ltd
Current assignee: Shenzhen Wanlidaguan Electromechanical Information Technology Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-07-14

Abstract

The invention discloses a three-axis railway locomotive power model bogie and a transmission device, which comprise a gear box, a framework connected with the outside of the gear box, and a traction rod assembly connected with the bottom of the framework; the gearbox comprises a gearbox control box at the top and a gearbox shell connected with the three group wheels, a power spindle is arranged in the gearbox control box, and one end of the power spindle penetrates through the gearbox control box and is connected with the motor through a universal joint sleeve; a central speed change gear is connected below the shaft body of the power main shaft, the central speed change gear is connected with a mediating gear set, and the mediating gear set is connected with a coaxial power gear; the mediating gear set and the coaxial power gears form an M-shaped outgoing path, the number of the coaxial power gears is 3, the coaxial power gears are positioned at the tail end of the M-shaped outgoing path and are respectively positioned at the wheel body positions of three sets of wheels, and a concave structure 1A and a concave structure 1B are arranged between the three sets of wheels.

Description

Three-axis railway locomotive power model bogie and transmission device

Technical Field

The invention belongs to the field of simulation models, and relates to a three-axis railway locomotive power model bogie and a transmission device.

Background

The existing simulation proportion model is difficult to combine the unification of dynamic state and static state. Particularly in railroad locomotive models. Since the diesel locomotives and electric locomotives in the real world mostly adopt electric transmission (some diesel locomotives adopt hydraulic transmission), for simulation, a model needs to perform scaling simulation of appearance state from each dimension of a three-dimensional space. The bogie is taken as a core component of a running gear of a locomotive vehicle and generally consists of a framework, a power device, wheel sets and a suspension device in the real world, but under the condition of a small-scale model (less than 1/45), a power unit on the corresponding bogie is difficult to find to meet the requirement of driving a vehicle body formed by the existing batch processing technology to run on a track at a reduced speed, so that since the end of the last century, a mature scheme is to place a small direct current motor inside the vehicle body and provide power for a gear box through a transmission shaft, and the gear box is responsible for outputting the power to a simulated bogie wheel set.

The gearbox is usually designed in such a way that the power output shaft of the gearbox is converted by a worm, and the power output of the cabin motor taking the tangential direction as the axis along the advancing direction of the locomotive is transmitted to the motion taking the normal direction as the rotating axis along the advancing direction of the locomotive through the worm. The gear set in this process is of a wide variety of configurations. However, the existing gear boxes in common use have some problems, such as firstly, in order to conduct power and change speed, a structure of multiple gear nesting and force transmission is adopted, so that the gear box is large in size and occupies a lot of space, and the gear box is seen from the side and is easy to see the inside through a bogie structure. The model bogie of the railway locomotive is of a structure that a high-position beam close to the bottom of the locomotive is adopted, and the lower part of the model bogie is not shown, so that a model gear box cannot be hidden from the side, and is forced to be made into dark color to reduce the visibility and enhance the simulation effect, and a plurality of process problems are brought. Meanwhile, the simulation degree of the appearance is also reduced.

For a three-axle bogie electric railroad locomotive model, the existing design is difficult to express the contour of the motor cabin of the bogie. This in turn reduces the simulation.

The current design of the appearance component of the bogie mainly meets the moderate simulation of the appearance structure, but is limited by the process and cannot be simulated to a higher degree. A suspension spring arrangement such as a bogie is difficult to represent properly, usually in relief.

In the real world railway locomotive, the bogie draw bar device has many kinds, and for some specific bogies, the draw bar device is located at two sides of the bogie along the track running direction and connected through a crank arm to form a link mechanism, one end of the link mechanism is connected with the train body, and the other end of the link mechanism is connected with the bogie frame.

However, due to the application scene of the small-scale model, on the small-scale model with the reduced size, such as an HO specification model system with the international standard rail compression ratio of 16.5mm, the radius of a rail curve is far smaller than that of the curve according to the real state, so that when a locomotive turns, the deflection amplitude of a bogie is far larger than that of a real vehicle, the bogie cannot be simulated and only can be reversed, and a traction mechanism is usually abandoned while the requirement of bending is met, so that the simulation degree of the bogie is greatly reduced, and the simulation characteristic, entertainment and ornamental value of the precision model are damaged.

Meanwhile, the installation mode of the existing gear box and bogie simulation structure is limited, and a plurality of independent components cannot obtain the installation opportunity on the premise of meeting the dynamic driving requirement and the static viewing requirement, so that the viewing and dynamic entertainment and interactive entertainment values of the model are objectively reduced.

In general, in the prior art, the requirements of omnibearing simulation and dynamic and static models are difficult to meet, namely, a railway locomotive model cannot be taken up to be displayed in an omnibearing way like models of airplanes, chariot and the like. The bottom of the car has no simulation details, and the side structure is not simulated.

The existing model bogie design has some defects, such as long distance between front wheels and rear wheels of a bogie with three sets of wheel pairs, the track can not be well contacted on a model track due to the shape of tread of the wheel pairs to obtain power supply or signals with low enough resistivity, and meanwhile, when some common problems are faced, the wheel pairs can not ensure the maximum contact, power failure is easily caused or one set of tread and two sets of treads are temporarily suspended, so that a model locomotive temporarily loses power or loses continuous signals. Almost all the current small-scale simulation railway locomotive models adopt a power mode of conductive rail power supply, which also puts high requirements on the reliability of the wheel-rail contact relation in dynamic operation. Therefore, there is room for improvement in both of these problems.

Disclosure of Invention

The invention aims to: by designing a novel three-axis electric transmission locomotive model bogie and by reasonable transmission mechanism design, the three-dimensional space visual simulation effect is improved as much as possible while the three-axis electric transmission locomotive model bogie has good power transmission and bearing capacity, the requirements of dynamic driving and static viewing are combined, the railway locomotive model provided with the bogie component can better run on the tracks with corresponding proportion, and a good simulation viewing effect can be provided under the dynamic condition during running. On the other hand, on the basis of the well-adapted mature processing industry and design specifications, the bogie provides a future upgrading space through reasonable design, and provides a basic platform assembly for realizing more functions.

The technical scheme adopted by the invention is as follows:

a three-axis railway locomotive power model bogie and transmission device comprises a gear box, a framework connected with the outside of the gear box, and a traction rod assembly connected with the bottom of the framework; the gearbox comprises a gearbox control box at the top and a gearbox shell connected with the three group wheels, a power spindle is arranged in the gearbox control box, and one end of the power spindle penetrates through the gearbox control box and is connected with the motor through a universal joint sleeve; a central speed change gear is connected below the shaft body of the power main shaft, the central speed change gear is connected with a mediating gear set, and the mediating gear set is connected with a coaxial power gear; the mediating gear set and the coaxial power gears form an M-shaped outgoing path, the number of the coaxial power gears is 3, the coaxial power gears are positioned at the tail end of the M-shaped outgoing path and are respectively positioned at the wheel body positions of three groups of wheels, and a concave structure 1A and a concave structure 1B are arranged between the three groups of wheels;

the framework is formed by connecting a front end beam, a rear end beam, a left side beam and a right side beam end to end, and is connected with the gear box shell; the left side beam and the right side beam are respectively provided with an axle box, a side bearing support and a crank arm seat; the crank arm seat is connected with a crank arm of a traction rod in the traction rod assembly;

the traction rod assembly comprises a connecting rod, one end of the connecting rod is hinged with one end of a traction rod connecting lever, the other end of the traction rod connecting lever is hinged with one end of the pull rod, a through groove connected with a connecting lever seat is arranged at the inflection point position of the traction rod connecting lever, two lug plates are arranged on the connecting lever seat, a pin shaft is arranged between the lug plates, and the through groove is connected with the pin shaft; the other end of the pull rod is connected with the base of the traction seat; the other end of the connecting rod is arranged in a mirror image mode.

Further, the power main shaft adopts a worm shaft.

Further, the gearbox control box and the gearbox shell are connected through bolts or buckles.

Further, the mediating gear set includes a plurality of mediating gears.

Further, the gearbox also comprises motor hanging seats, and the number of the motor hanging seats is 3.

Further, the connecting rod is made of metal or plastic.

Further, the number of the coaxial power gears is 3, and the horizontal position of the coaxial power gear positioned in the middle position is further higher than that of the coaxial power gears positioned on the left side and the right side.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the gear box adopts the design of an M-shaped transmission route, the appearance constraint condition of the gear box is obviously relaxed, the three-dimensional structure outline of a plurality of traction motor cabins of the electric transmission internal combustion and electric locomotives under the real environment can be well simulated, and particularly for the locomotive vehicles adopting a bogie side beam with higher positions and adopting suspension type and pull rod positioning type suspension, the sight line of the audience visual angle can be free from obstruction, and the simulation degree is greatly improved.

2. The design of the gear box enables the combined structure of the motor cabin suspension of the electric locomotive and the traction motor cabin arranged in parallel with the wheel shaft to be well simulated, so that the locomotive model has the characteristic of appearance simulation when viewed from the bottom surface, which is limited by the advantage that the transmission structure is not realized, and the omnidirectional simulation can be immediately realized instead of only satisfying the simulation with limited side surfaces and top surfaces.

3. The gear box structure using the M-shaped transmission path can ensure that a continuous gear transmission mechanism which is stable and has higher transmission efficiency and the same plane with the rotating angular speed of the wheel pair is used under the condition of meeting the requirement of the limitation of the appearance size, and avoids the interference caused by the precession of other transmission modes such as a tangential transmission shaft in the motion direction, the abrasion to the gear mechanism and the like. The design can be compatible with a main power motor-worm gear-gearbox force transmission structure which is widely adopted at present, the function of the gearbox is not damaged, and the application is greatly expanded without excessive dependence on other components such as a vehicle body and the like, so that a plurality of products can be upgraded by applying the technology.

4. The gear box adopts a replaceable upper structure, can realize the simulation of the requirement of 'fireless loopback' in the real world on the power locomotive model in a worm and gear program control, electric control or mechanical control lifting mode, greatly improves the practicability of the railway locomotive model and expands the dynamic application boundary.

5. The closed surrounding type framework is adopted, the mechanical structure strength of the existing bogie for simulating the micro-scale of the similar locomotive is improved, and meanwhile, a relatively stable small part assembly platform is constructed. This allows many of the parts previously relied upon for side beams to be re-mounted to the cross-beam and provides a stable mounting platform in the normal model rail traffic environment.

6. Because the framework structure forms a stable frame structure and has enough rigidity, the bogie design comprises a plurality of expansion modes of connecting the vehicle body. The bogie bears the gravity of the vehicle body and provides traction force in a mode that the gear box is combined with the framework, free rotation and force transmission are realized through the center-like plate part to the vehicle body, multi-point connection can be supported, the bearing force of the gear box is separated, and the power is transmitted to the locomotive in a side bearing steering mode and the support effect of the bogie is achieved. Meanwhile, a stable operation platform is provided for the traction rod structure, and dynamic full-time all-around simulation of the traction rod is realized.

7. The traction rod structure on the model bogie can meet the passing capacity of adapting to a model track under the existing standard, and is obviously greater than the passing capacity of a swing angle under a real-vehicle scaling state, so that when a user of the model is viewed statically, the locomotive model adopting the invention presents extremely high simulation degree, and when the model runs dynamically, the invention ensures that the user and an operator of the model do not worry that the side bogie traction rod cannot be well connected with the locomotive, thereby limiting the swing amplitude of the bogie module relative to a locomotive body on a parallel surface of a track surface, and greatly expanding the track running condition limitation of the locomotive with the three-axis electric drive bogie structure.

8. The three shafts of the gearbox designed by the bogie can be different on the rail surface, the central shaft is slightly higher than the front and rear shafts, particularly on a widely applied 1/87 or HO-specification railway model system, the central shaft is higher than the shafts on the two sides by 0.1mm, so that wheel pairs have good rail adaptability, and as most of rails used by miniature model railway locomotives are spliced in sections, the rail surfaces between the two sections of rails are not parallel, particularly at the joint of a larger gradient of rail steering, the positions of the three shafts are the same, so that most of the wheel pairs are easily suspended, the static friction area of the model locomotive is reduced, the power is reduced, and meanwhile, because most of simulation railway locomotive models adopt a rail power supply mode, the problems of poor contact and the like are easily caused. The design of the elevated central shaft may be small to solve this problem, extending the degree of adaptability to the track and improving the reliability of the electrical system.

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 will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:

FIG. 1 is an exploded view of the truck of the present invention;

FIG. 2 is a perspective view of a gearbox of the present invention as an integral part;

FIG. 3 is a rear elevational view of the gear box of the present invention as an integral part thereof;

FIG. 4 is a schematic representation of the transmission path of the gearbox of the present invention;

FIG. 5 is a perspective view of a drawbar as part of the present invention;

FIG. 6 is a perspective view of the overall construction of the present invention;

FIG. 7 is a first angled bottom view of the overall structure of the present invention;

FIG. 8 is a second bottom angled view of the overall structure of the present invention;

FIG. 9 is a third bottom angled view of the overall structure of the present invention;

FIG. 10 is an enlarged fragmentary view of the drawbar assembly of the present invention;

FIG. 11 is a sample of the 1/87 proportional diesel locomotive dynamic simulation model for turning a curve of 450 mm;

the labels in the figure are:

11-a gearbox control box, 12-a gearbox shell, 13-a power main shaft, 14 universal joint sleeves, 15, a central speed change gear, 16-a mediating gear set and 17-a coaxial power gear;

21-left side beam, 22-right side beam, 23-front end beam, 24-rear end beam, 211-axle box, 212-side bearing support and 213-crank arm support;

31-connecting rod, 32-connecting rod pin, 33-connecting rod pin, 34-draw bar connecting rod, 36-draw bar, 37-draw bar base;

40-secondary suspension spring, 41-scanner, 42-brake cylinder, 43-motor suspension rod, 44-axle box shock absorber, 45-rear sand box, 47-front sand box, 49-single-side brake shoe and 48-oil bottle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

Example one

The bogie and the transmission device are mainly characterized in that a surrounding framework structure is used for simulating the appearance of a model prototype model, and a fixed external surrounding structure is formed by side beam-end beam sealing; the gearbox is made of zinc alloy, copper or plastic materials, the gearbox and the appearance component of the framework are fixed in a screw bolt or splicing adhesive mode, and the width of the gearbox between wheel pairs is adjusted to meet the requirement that a locomotive model runs on a rail; the gear box is provided with a plurality of gears, coaxial gears corresponding to the three sets of wheel pairs rotate in the same direction at the same speed, and the coaxial gears are meshed by a plurality of gears with proper sizes to transmit the same angular speed; the assembly positions are arranged on the gear box and the surface in a proper mode to add independent accessory parts, and meanwhile, a foundation is provided for the future upgrade of a driven tread brake simulation device; the connecting line of the centers of the circles of the gears in the gear box is not a straight line, but is a plane in which the vertical vector of the track plane is coplanar with the tangential vector of the current locomotive running direction, namely, an M-shaped transmission path is formed on the side face of the locomotive in most human eyes. This drive path allows the lower part of the gearbox to be reduced and allows two deep slots to be present between which there is "no" structure necessary for the gearbox, which "no" refers to a recessed structure underneath the gearbox, without any mechanical structure participating in the operation of the gearbox;

the traction power output by the central motor is transferred to a coaxial power gear 17 on which the wheel axle of the bogie is positioned through a central speed change gear 15 and a mediating gear set 16 under the turning or straight running state of the locomotive by a power main shaft 13 and a universal joint sleeve 14 or other force transmission mechanisms on a gearbox control box 11. The gearbox may be formed by a gearbox control box 11 and a gearbox housing 12, which are tightly connected using bolts or snaps, and the frame 2 is fixed to the gearbox housing 12 by means of bolts or friction fit. The number of the central speed-changing gear 15, the coaxial power gear 17 and the specific gears in the mediating gear set 16, the transmission ratio and the module of the gears can be changed according to the actual needs, and the shafts of the central speed-changing gear 15, the coaxial power gear 17 and the mediating gear set 16 can be integrated with a gear wheel disc or can be separately processed as a separate metal or nonmetal rigid shaft. Under the condition that the whole worm-gear power set is connected with the central output, the driving torque of the wheel shaft far exceeds the component of the gravity of the wheel pair loaded on the wheel pair on the inclined track surface, so that the model locomotive is prevented from sliding. The lower part of the gear box is provided with simulated motor hanging seats 171, generally three, which can be provided with hanging accessories 43;

the overall drive path shows an M-shaped drive path, which allows the bottom of the gearbox housing 12 to be conditioned to leave recessed structures 1A and 1B between the three parallel axles. The truck left and right side rails 21, 22 are in a shielded relationship with the gear box. Due to the fact that the gear box 1A and the gear box 1B are arranged, when a user looks from the side of the locomotive, a complete penetrating visual field exists, when the user looks from the side, the visual line height simulation effect can be achieved, and interference of the traditional small-proportion electric transmission internal combustion locomotive model gear box to the visual line is avoided.

Example two

In the embodiment, on the basis of the first embodiment, a central wheel set can be arranged between three wheel sets of the gearbox and is higher than corresponding heights of a front wheel set and a rear wheel set so as to adapt to up-and-down slope joints of a model track and provide enough space for installing wheel set tread rubber rings; the worm wheel and worm rod connected with the gear box and the main power motor are provided with independent modular structures, so that the worm can be separated from the gear box below, and the power output is cut off; the simulated wheel set is adopted, so that the tread meeting the industrial specification is met, the appearance effect of simulating the worn bright tread is provided, and the wheel set adaptive to various power supply systems can be replaced; the appearance of the gear box is provided with a specific contour line, so that the structure of an electric locomotive real vehicle can be simulated; the device has the capability of acquiring electric energy or analog and digital electronic signals of corresponding systems from the track by the metal elastic sheet or the bearing.

EXAMPLE III

The embodiment is based on the second embodiment: the gearbox control box 11 is a separate component. This enables the power spindle 13 to be separated from the drive shaft under the drive of the controlled lifting assembly of the gearbox control box 11, enabling the decoupling of the self-locking of the main power worm gear arrangement. The framework is a plurality of parts, is made of alloy or plastic, and is generally a frame enclosed by a left side beam 21, a right side beam 22, a front end beam 23 and a rear end beam 24, an axle box 211 for appearance attribute presentation and a side bearing support 212 are arranged on the left side beam 21 or the right side beam 22, the side bearing support can expand side bearing accessories for stable steering, the enclosed structure is a stable frame rigidly connected with a middle gearbox, and the accessories required by various appearances and functions can be expanded according to the requirements of models. The two side crank arm seats 213 are connected with the draw bar crank arms 34.

Example four

The embodiment is based on the third embodiment; the framework consists of a connecting rod 31, a pair of draw bar crank arms 34 are connected at two ends through connecting rod pins 32, the draw bar crank arms 34 are connected with a draw bar 36 through crank arm pins 33, the draw bar 36 is further connected with a draw bar base; the turning point position of the traction rod turning arm 34 is provided with a through groove connected with a turning arm seat 213, the turning arm seat 213 is provided with two lug plates, a pin shaft is arranged between the lug plates, and the through groove is connected with the pin shaft.

The two drawbar bell crank arms 34 are connected by a connecting rod 31. The connecting rod 31 is a long rod with holes at two ends and certain rigidity, which is naturally straightened when not stressed, the pin-shaped structure extending from the connecting rod pin 32 or the traction rod crank arm 34 is connected with the traction rod crank arms 34 at two sides, the traction rod crank arm 34 rotates around the connecting rod pin 32 as a shaft, the connecting rod 31 can be adjusted and designed into a long rod with certain deflection after being stressed according to the difference of specific conditions of force transmission on the friction coefficient of parts and the like, and the long rod can be made of metal or plastic.

The draw bar connecting lever 34 is placed on a plane perpendicular to the connecting rod pin 32 and inserted into the connecting lever seat 213, a through groove connected with the connecting lever seat 213 is arranged at the inflection point position of the draw bar connecting lever 34, two lug plates are arranged on the connecting lever seat 213, a pin shaft is arranged between the lug plates, and the through groove is connected with the pin shaft; the through groove is designed into a shape which is consistent with the rotating motion path of the bogie according to actual requirements, and a gap is ensured to be sleeved on a column head of the crank arm seat in the whole motion process. Usually, the through slot can be designed to have a forward opening direction, i.e. the opposite side of the worm gimbal relative to the rotation axis or the opposite side of the motorcycle where the crank arm is located, so that the worm gimbal can be smoothly installed during product assembly.

Since the location of the bell crank seats 213 relative to the truck body is constant, the pin of the bell crank seats 213 acts as a constraint, allowing the combination of the connecting rod 31, the two drawbar bell cranks 34, to swing in the same direction during swinging. The drawbar crank arm 34 is connected to a single side drawbar 36, and is configured in a non-circular hole that fits within the void formed by the drawbar base inner member and the drawbar base outer member.

The swing of the entire bogie is shown when the drawbar bell crank 34 is fixed in the bell crank seat 213 and the drawbar bell crank 34 rotates in the same direction on a plane parallel to the track plane. When the bogie rotates counterclockwise and the drawbar bell crank 34 rotates counterclockwise, the drawbar bell crank 34 rotates clockwise. During rotation, the crank pin 33 moves in the same direction and opposite direction on the parallel surface of the track surface relative to the advancing direction of the locomotive respectively, and the noncircular hole provides clearance for forward and backward movement on the hook, so that the pull rod is restrained on the hook of the traction rod base 37 and cannot fall off. Accordingly, the non-circular holes allow the crank pin 33 to be restrained from falling off the clevis of the drawbar base 37. In the normal operation or transportation and moving process of the model locomotive, the motion combination enables each component of the motion system to normally swing and rotate on the parallel plane of the track plane due to the comprehensive stress relation of each direction, the locomotive body and the bogie.

As shown in fig. 8, the entire bogie is in contact with the underbody via the salient points of the center pedestal, and the center pin of the center pedestal serves as the pivot center of the bogie relative to the vehicle body. The salient points and the central core plate pin may also be replaced by micro bearings.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents and improvements made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A three-axis railway locomotive power model bogie and transmission device is characterized in that: the traction rod assembly comprises a gear box, a framework connected with the outside of the gear box and a traction rod assembly connected with the bottom of the framework; wherein,

the gearbox comprises a gearbox control box (11) at the top and a gearbox shell (12) connected with three group wheels, a power spindle (13) is arranged in the gearbox control box (11), and one end of the power spindle (13) penetrates through the gearbox control box (11) and is connected with the motor through a universal joint sleeve (14); a central speed change gear (15) is connected below the shaft body of the power main shaft (13), the central speed change gear (15) is connected with a mediating gear set (16), and the mediating gear set (16) is connected with a coaxial power gear (17); the mediating gear set (16) and the coaxial power gears (17) form an M-shaped outgoing path, the number of the coaxial power gears (17) is 3, the coaxial power gears are positioned at the tail end of the M-shaped outgoing path and are respectively positioned at the wheel body positions of three groups of wheels, and a concave structure 1A and a concave structure 1B are arranged between the three groups of wheels;

the framework is formed by connecting a front end beam (23), a rear end beam (24), a left side beam (21) and a right side beam (22) end to form a framework, and the framework is connected with the gear box shell (12); the left side beam (21) and the right side beam (22) are respectively provided with an axle box (211), a side bearing support (212) and a crank arm seat (213); the crank arm seat (213) is connected with a traction rod crank arm (33) in the traction rod assembly;

the traction rod assembly comprises a connecting rod (31), one end of the connecting rod (31) is hinged with one end of a traction rod crank arm (34), the other end of the traction rod crank arm (34) is hinged with one end of a pull rod (36), a through groove connected with a crank arm seat (213) is arranged at the inflection point position of the traction rod crank arm (34), two lug plates are arranged on the crank arm seat (213), a pin shaft is arranged between the lug plates, and the through groove is connected with the pin shaft; the other end of the pull rod (36) is connected with a traction seat base (37); the other end of the connecting rod (31) is arranged in a mirror image mode.

2. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the power main shaft (13) adopts a worm shaft.

3. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the gearbox control box (11) and the gearbox shell (12) are connected through bolts or buckles.

4. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the mediating gear set (16) includes a plurality of mediating gears.

5. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the gearbox also comprises motor hanging seats (18), and the number of the motor hanging seats (18) is 3.

6. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the connecting rod (31) is made of metal or plastic.

7. The three-axle railroad locomotive power model bogie and transmission of claim 1, wherein: the number of the coaxial power gears (17) is 3, and the horizontal position of the coaxial power gear (17) positioned in the middle position is higher than that of the coaxial power gears (17) on the left side and the right side.