JPS6277856A - Eddy-current brake gear - Google Patents

Abstract

PURPOSE:To eliminate the generation of the thermal deformation of a coil holder by fixing one end section of the coil holder, to which an eddy current generator is fitted, to one frame body of a frame supporting a bearing housing for an axle. CONSTITUTION:A brake disk is mounted to the intermediate section of an axle 4, and one end section 6a of a coil holder 6 is fastened to one frame body 1a of a frame 1, where the brake disk is positioned by a mounting bolt 8 through a seat plate 7. An elastic body 13 is fast stuck to the other end section 6b of the coil holder 6, and the other end section 6b and the elastic body 13 are settled to the other frame body 1b of the frame 1 through a seat plate 14 by a mounting bolt 9. Accordingly, braking heat generated by braking torque is dissipated uniformly extending over the whole coil holder 6 by thermal conduction, thus removing the thermal deformation and strain of the coil holder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an improvement in a whirlpool brake system used in railway vehicles and the like.

[Technical background of the invention] This type of eddy current brake device proposed above is
It is constructed as shown in FIGS. 5 to 8.

That is, in FIGS. 5 to 8, a pair of bearing boxes (axle boxes) 2 are provided on an underframe 1 of a bogie in a railway vehicle, and both bearing boxes 2 are provided with wheels 3 and integrally connected to each other. Axle 4
is mounted on the shaft. Further, in the middle of this axle 4, as shown in FIGS. 6 and 7, each υ1-motion disc 5 is attached to the shaft, and the above-mentioned underframe 1 on which the brake disc 50 is located is attached.
One end 6a of a coil holder 6 is fixed to one frame 1a via a seat root 7 with a mounting bolt 8.

Furthermore, the other end 6b of the coil holder 6 is connected to the underframe 1.
J3 is fixed to the other frame 1b with mounting bolts 9, and the coil holder 6, which is located around the moving disks 5 and 11, is provided with a plurality of iron cores 10 and i. ;I
+...Each eddy current generator 12 configured to form an arc shape with the coil 11 is provided at intervals.

Therefore, in the above-mentioned eddy current braking device, when applying the brakes while the vehicle is running, when the excitation coil 11 of the eddy current generator 12 is excited, a magnetic flux is generated in a direction that passes through the brake disc 5. Eddy currents are generated in the brake disc 5 which is rotating together with the brake disc 4. Then, a brake torque (braking torque) is generated in the brake disc 5 in a direction opposite to the rotational direction, and this brake torque applies a braking force to the axle 4 to reduce the traveling speed of the vehicle.

[Problems with background technology]

However, the above-described eddy current brake device has the following drawbacks.

(1) In general, bogies are made smaller in size in order to make them lighter in weight, and when the weight of the bogie is loaded or when traveling at high speed, the underframe 1 of the bogie undergoes elastic deformation (bending) within an allowable range.
The coil holder 6 is mounted on the underframe 1, which has relatively low rigidity.
When the coil retainer 6 is fixed with the mounting bolts 8 and 9, elastic deformation of the bogie during car body assembly or while the vehicle is running causes a large bending stress to act on the coil retainer 6. , li. Since more load than necessary is applied to the resting body, in order to prevent this from occurring, it is necessary to construct the coil holder 6 itself into a heavy and long laminated structure.

(2) On the other hand, 1. When manufacturing the F-marking frame 1, if the coil holder 6 and its mounting part are not properly processed for parallelism or flatness, bending stress will be generated in the coil holder 6, resulting in poor strength. There is a possibility that it will be sufficient.

(3) Furthermore, during braking, the excitation coil 11 is
The current generated generates heat and the temperature rises, causing the υ1 disk 5
Both are heated to R by eddy current. In particular, as the frequency of use of the brake increases, the temperature rise increases, and even when a large braking force is applied, the excitation current increases, so the temperature rise due to heat generation increases. is heated, expands thermally, and is displaced as shown in FIG. That is, both ends 5a, 6b of the coil holder 6 are connected to each frame body la, by each mounting bolt 8.9.
Since the coil holder 6 is fixed at lb, the coil holder 6 after thermal expansion may be bent due to thermal deformation, which may reduce the braking efficiency of the eddy current generator 12 provided.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and eliminates thermal deformation (bending) and distortion caused to the coil holder due to thermal stress generated during braking of an eddy current brake, and also makes the entire device smaller and lighter. (2) To provide an eddy current brake device with the purpose of improving Lllll assistance.

[Summary of the invention]

The present invention provides an eddy current brake device that includes a brake disc mounted on an axle and thin current generators disposed facing each other around the brake disc, and a stand that supports a bearing box of the axle. One end of the coil holder provided with the eddy current generator is fixed to one frame of the frame, a pair of upper and lower elastic bodies are pasted to the other end of the coil holder, and these are attached to the stand. Fix it to the other frame of the frame with the four members and υI! I
! The structure is such that the brake heat generated at 11 o'clock is radiated to a uniform shade to eliminate thermal deformation of the coil holder.

(Example of the invention) Hereinafter, the present invention will be explained with reference to five 1M examples shown in the drawings.

It should be noted that the present invention will be explained by assigning the same reference numerals to the same constituent members as in the above-described specific example.

In FIGS. 1 and 2, reference numeral 1 denotes an underframe of a bogie in a railway vehicle, and this underframe 1 is provided with a pair of bearing boxes (see FIG. 5) 2. The bearing box 2 is equipped with an axle 4 that is integral with the axle 3. or,
A brake disc 5 is pivotally mounted in the middle of the vehicle @ 4, and one end 68 of the coil holder 6 is attached to the seat plate on one frame 1a of the underframe 1 on which the brake disc 50 is located. 7 and is fixed by a mounting bolt 8. Furthermore, ll! of the coil holder 6! ! The end portion 6b is provided with a pair of upper and lower elastic bodies 13, such as rubber, for example.
/i, and the other end 6b and both elastic bodies 13 are
The mounting bolts are attached to the other frame body 1b of the above-mentioned underframe 1.
has been fixed through. Roughly speaking, a plurality of iron cores 10 and an excitation coil 1 wound around them are mounted on the coil holders 6 at positions facing each other around the brake disk 5.
An eddy current generator 12 is provided which is configured to form an arc shape with 1 and 1.

Therefore, when the brakes are applied while the vehicle is running, the excitation coil 11 generates heat due to the exciting current and its temperature rises.Moreover, the temperature of the brake disc 5 also rises due to the eddy current, and the coil holder 6 that holds them also rises in temperature. However, the brake heat generated by these brake torques is evenly radiated throughout the coil holder 6 by thermal conduction, eliminating thermal deformation (IQ distortion) and distortion, and improving braking. People start trying to improve efficiency.

Next, in another embodiment of the present invention shown in FIG. 3, a flanged elastic body 15 is attached to the outer peripheral surface of the seat plate 16, which has a cylindrical portion 16a divided into two parts at the other end 6b of the coil holder 6. This is mounted and fixed to the frame body 1b with mounting bolts 9, and has the same structure as the specific example described above.

On the other hand, in another embodiment of the present invention shown in FIG. In both cases, a pair of elastic bodies 13 are attached to the other end 6b of the coil holder 6 and interposed therein.

〔Effect of the invention〕

As described above, according to the present invention, the brake disc 5 is attached to the axle 3, and the eddy current brake device equipped with the eddy current generator (A12) disposed around the brake disc 5 facing H. , one end of the coil holder provided with the eddy current generator 12 is fixed to one frame 1a of the underframe 1 that supports the bearing box 2 of the axle 3, and the other end of the coil holder 6 is fixed. A pair of upper and lower elastic bodies 13 are attached to the upper and lower parts 6b, and these are secured to the frame 1a on the side of the underframe 1 with the A' member 9, so that braking heat can be radiated evenly. , it is possible to eliminate thermal deformation and distortion in the coil holder 13, and to improve braking efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a wax current brake device according to the present invention, FIG. 2 is an enlarged sectional view of the chain circle A section in FIG. 1, and FIGS. FIG. 5 is a plan view, not showing a part, of a truck incorporating an already proposed eddy current brake device, FIG. 6 is a sectional view of the same, and FIG. 7 is a sectional view of the same. An enlarged sectional view taken along the chain B-8 in FIG. 6 and FIG. 8 are diagrams for explaining the operation of the eddy current brake device. 1... Underframe, 2... Bearing box, 3... Axle, 5...
・Brake disc, 6... Coil holder, 7... Seat plate, 8, 9... Mounting bolt, 10... Iron core, 11...
- Excitation coil, 12... Eddy current generator, 13...
Elastic body, 14... seat plate. Applicant representative νf Fuji-yu 4th

Claims (1)

[Claims] In an eddy current braking device comprising a brake disc mounted on an axle and eddy current generators arranged facing each other around the brake disc, one of the underframes supporting the bearing box of the axle is provided. One end of the coil holder provided with the eddy current generator is fixed to the frame, a pair of upper and lower elastic bodies are attached to the other end of the coil holder, and these are attached to the other end of the underframe. An eddy current brake device characterized by being fixed to a frame with a mounting member.