JPH0225826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a bogie for preventing axle load shift for a vehicle with good running characteristics.

(Prior art) A typical example of an axle load movement prevention trolley is the
The reverse ha link structure shown in Publication No. 23214 and the Japanese National Railways
The structure using the jackman link used in ED75 etc. is known. The method disclosed in Japanese Patent Publication No. 36-23214 has been used in Japanese National Railways ED72, ED73, EF63, etc., and has been confirmed to have a good effect on preventing axle load movement. Although there is not much difference in function between these two types, the major feature of the reverse ha-link type is that the core plate is located at the center of the bogie and reaches the bogie traction beam through the middle beam of the bogie frame. On the other hand, in the jackman link system, there is no core plate at the center of the bogie, and the body and bogie are connected only by link movement, so if the track conditions are guaranteed and the operation is correct, both the bogies will be perfectly connected. Although there is no difference, if track conditions are not good and driving conditions are rough, derailments and other problems are expected to occur frequently. In addition, in the reverse link system,
Since the center plate is completely fitted with the bogie, it has a strong structure that is advantageous for separating the car body and the bogie. However, in the case of a reverse hall link structure (the structure of a general low center dish is shown in Figure 1 and the case of a reverse hall link is shown in Figure 2), if the traction force transmitted between the car body and the bogie is F, then When a relative displacement occurs due to the displacement of the pillow spring between the two, in the case shown in Figure 1, a damping force of μF (where μ is the coefficient of friction between the core plate metal fitting and the bogie structure) is generated without the influence of the center plate height. On the other hand, in the case of FIG. 2, a damping force of μF2h ₁ +h ₂ /h ₂ acts, which is given as a function of the height of the core plate metal fitting. Therefore, it has been confirmed in actual vehicles that the vibration amplitude may fall within the over-suppression range for acting forces that are below a certain vibration amplitude or above a certain traction force.

To prevent this over-suppression phenomenon, the special public
Publication No. 19474, Japanese Patent Publication No. 39-28785, and Japanese Patent Application Publication No. 1987-28785
No. 55-4206 is known.

Next, an outline of the conventional truck structure will be explained with reference to FIGS. 1 and 2. Reference numeral 1 indicates the vehicle body, 2A indicates the low-center dish bogie frame, and 2B indicates the normal reverse-haul link axle weight shift prevention bogie frame. 3 is the wheel, 4 is the pillow spring, 5 is the shaft spring, 6
indicates the axle box of wheel 3. 7A and 7B are core plates for the respective carts, and basically have similar shapes. Reference numeral 8 indicates a low-centered bogie underbody frame in which the beam is lowered and a sliding hole is provided in which the center plate 7A and the center plate metal fitting 15A are inserted, and the traction force is transmitted between the bogie underframe 2A and the center plate 7A. .

On the other hand, in the reverse-haul link truck shown in FIG. 2, the traction beam 9 is rotatably supported in the pitching direction by a reverse-haul link 10A whose center line extension intersects near the rail surface on a support 12 provided on the bogie frame. , and more heart plate 7
The core plate metal fitting 15B attached to the tip of B is inserted into the sliding hole provided in the traction beam 9, and by the action of the reverse link 10A, it has the same effect as if the core plate was placed on the rail surface. tractive force is transmitted.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional inverted hall link truck equipped with an over-damping prevention device, although it is structurally satisfactory in actual tests, it has a very complicated structure. As a result, maintenance was a long time, which was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and it is an object of the present invention to provide an axle load movement prevention truck that has a simpler structure and does not impair the effect of preventing excessive braking.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention disposes a car body on a bogie underframe via a pillow spring, and also provides a center plate on this car body. The traction beam is supported on the bogie underframe by disposing a reverse halo link, a traction beam, and a core plate metal fitting between the plate and the bogie underframe, and the intersection of the center lines of the reverse halink is located near the rail surface, and the traction beam In an axle load movement prevention trolley that transmits traction force between the traction beam and the center plate via the center plate metal fitting, the lower part of the traction beam and the center plate metal fitting are connected by a traction force transmission link having a degree of freedom in the vertical direction, and the center of the traction beam is connected. A sliding surface is formed by providing an insertion opening through which the core plate penetrates, and providing a sliding plate on the front and rear surfaces of the upper part of the core plate metal fitting and on the front and rear inner surfaces of the upper part of the core plate through hole of the traction beam. The core plate is restrained in the front-rear direction by contact sliding of the plate, and the sliding force during relative displacement between the car body and the bogie frame is suppressed to an appropriate value that does not cause excessive vibration damping of the pillow springs mentioned above. It is characterized by

(Function) According to the present invention configured as described above, the structure is extremely simple, and the damping frictional force is kept within an allowable range.

(Example) The following is an example of the present invention shown in Figures 3 and 4.
This will be explained with reference to the figures.

In the reverse suspension link type axle load movement prevention trolley with excessive vibration damping prevention function shown in Fig. 3, a rubber seat support 13 is mounted on the trolley frame 2C.
is provided, and a reverse link 10B having anti-vibration rubber 14 and whose center line extension intersects almost at the rail surface is connected to the traction beam 1.
1, and furthermore, a center plate fitting 1 is installed in the traction beam 11.
6 are fitted as shown in FIG.

FIG. 4 shows a cross section of the center plate 7C and the traction beam 11 in the longitudinal direction of the vehicle body, viewed from the side. A wear-resistant bushing 17 is fitted into the center plate 7C, and a wear-resistant bushing 17 is fitted into the center plate metal fitting 16. It is designed to be able to slide between the bushes 17 and 18 so as to have a degree of freedom in the carriage swivel direction. At this time, in order to prevent the core plate metal fitting 16 from falling off from the core plate 7C, the center plate metal fitting receiver 21 is installed.
A core plate metal fitting is attached and fixed to the tip of the core plate 7C with bolts 22. Link receivers 23 are attached to the left and right ends of the core plate fitting 16, and a traction force transmission link 26 is arranged between the link receiver 24 provided on the traction beam 11B and a pin 25 is provided to allow free vertical movement. has been done. Slot plates 19 are attached to the front and rear surfaces of the upper part of the core plate metal fitting 16, respectively, and are separated into the front and rear of the traction beam to form insertion holes for the center plate metal fitting 11.
Slip plates 20 are also attached to the opposing surfaces of A and 11B, respectively, and are configured to slide vertically relative to each other.

Next, the above embodiment will be explained. In the case of the general low center plate fitting shown in Fig. 1, when the pillow spring 4 is displaced and the center plate fitting and the bogie underframe are displaced relative to each other when the traction force F is transmitted to the car body, a damping friction force of μF occurs. acts.

On the other hand, as explained with reference to FIG. 4, the axle load movement prevention bogie has a function of equivalently transmitting the traction force generated at the rail surface 27 where the wheels come in contact to the center plate 7C, and F ₁ is the one described above. is equal to F. At this time, the acting force F ₂ transmitted through the link 26
is F ₁ h ₁ /h ₂ +F ₁ =F ₁ h ₁ +h ₂ /h ₂ =F ₂ , and is generally much larger than F. Here _F3 is
F ₁ h ₁ /h ₂ =F ₃ , and since h ₁ is set as small as possible and h ₂ is set as large as possible for the locomotive structure, generally F ₃ ≦F ₁ .

In the conventional reverse link type axle load movement prevention bogie, there was no rework 26, and instead the sliding surface was large and extended to the bottom end, so the pillow spring was displaced and the core plate and traction beam were slid. When it moves, a damping frictional force of (F ₂ +F ₃ )μ=F ₁ 2h ₁ +h ₂ /h _2μ acts. This value is a little less than three times as large as F ₁ μ, resulting in an excessive damping function.

However, according to the structure of the present invention shown in Fig. 4, the largest acting force, _F2 , is transmitted by the link, so the frictional vibration damping force is almost negligibly small, and the generated frictional damping force is negligible. The force is F ₃ μ, which is almost the same as the frictional damping force μF of the low-center dish-shaped bogie shown in Figure 1, and with this level of frictional damping force, the car body vibration will be oversuppressed. It has been confirmed through actual operation that this is not the case, and calculations show that there is no excessive vibration damping that would cause a problem within the range of generated traction force.

Furthermore, as shown in Fig. 3, the reverse hall link 10B
By placing anti-vibration rubber at the joint to the bogie frame, it is possible to reduce the transmission of vibrations and shocks between the car body and the bogie from the core plate.

[Effects of the Invention] As explained above, according to the present invention, if a link that transmits traction force is arranged at the lower part of the reverse link device that transmits a large traction force, and the upper part has a sliding structure, the structure can be extremely improved. It is simple and the vibration damping friction force can be kept within the allowable range, so it is possible to strike an extremely good balance between structural simplification and vibration characteristic friction damping force, resulting in extremely good over-suppression. It is possible to obtain a reverse link type axle load movement prevention trolley having a prevention function.

Furthermore, according to the present invention, the forces acting on conventional sliding parts are analyzed, and the lower part of the sliding parts of the reverse halo link traction beam and core plate, which have the largest acting force, are used as traction force transmission links. By leaving the conventional sliding structure on the upper part of the replacement, it is structurally the simplest, and conservatively, the traction force transmission link is placed at the lowest part where it is easiest to reach, making it easier to balance the vehicle body. This makes disassembly work easier.

[Brief explanation of drawings]

Fig. 1 is a conceptual explanatory diagram showing a conventional low center plate type locomotive bogie, Fig. 2 is a conceptual explanatory diagram showing an axle load movement prevention bogie for a conventional reverse hall link type locomotive, and Fig. 3
The figure is a conceptual explanatory diagram showing an axle load shift prevention bogie for a reverse-hauling type locomotive with an over-damping prevention function according to the present invention, and FIG. 4 is a detailed sectional view showing the area around the center dish metal fitting in FIG. 3. 1... Vehicle body, 2... Bogie frame, 4... Pillow spring,
7C... Heart plate, 10A, 10B... Reverse Hall link,
11, 11A, 11B... Traction beam, 14... Anti-vibration rubber, 16... Core plate metal fitting, 17, 18... Wear-resistant bushing, 19, 20... Slip plate, 21... Core plate metal fitting holder, 23 , 24... Link receiver, 25... Pin, 26... Traction force transmission link, 27... Rail surface.

Claims (1)

[Claims] 1. A car body is placed on the bogie underframe via a pillow spring, and a center plate is provided on this car body, and a reverse halo link, a traction beam, and a center plate metal fitting are arranged between the center plate and the bogie underframe to form a traction beam. is supported on the bogie underframe, the intersection of the center lines of the above-mentioned inverted ha links is located near the rail surface, and the traction force is transmitted between the traction beam and the core plate via the center plate metal fitting. The beam and the lower part of the core plate fitting are connected by a traction force transmission link that has a degree of freedom in the vertical direction, and an insertion hole through which the core plate penetrates is provided in the center of the traction beam, and the front and rear surfaces of the upper part of the center plate metal fitting and the traction beam Sliding surfaces are formed by providing slot plates on the front and rear inner surfaces of the upper part of the center plate through-hole, and the contact and sliding of these slide plates restrains the center plate in the front and rear direction, so that when the car body and the bogie frame are displaced relative to each other. An axle load movement prevention trolley, characterized in that the sliding force of the pillow spring is suppressed to an appropriate value that does not cause excessive vibration damping of the pillow spring.