JP3482929B2 - Flexible plate shaft coupling for railway vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor shaft and a small gear shaft, which are disposed so as to face each other on substantially the same axis, such that the shaft ends of a motor shaft and a small gear shaft in a gear unit are caused by displacement of a bogie shaft spring. The invention relates to a railway vehicle shaft coupling that couples the torque of a motor to a gear device while allowing relative displacement of the motor. In particular, a flexible plate shaft coupling for a railway vehicle that allows the relative displacement by a flexible plate and transmits torque. It is about.

[0002]

2. Description of the Related Art As shown in FIG. 8, a conventional flexible plate type shaft coupling has two arms 3a at the shaft ends of, for example, a motor shaft 1 and a small gear shaft 2 of a gear device, which are opposed to each other. The joint bodies 3 and 4 having 4a are mounted by taper shrink fitting, and the arms 3a and 4a of the respective joint bodies 3 and 4 are intermediately bent via the flexible plate 5 fastened with bolts 8 at the tops on diagonal lines. The bodies 6 and 7 are joined, and the intermediate bodies 6 and 7 are connected to each other with bolts 8
The motor shaft 1 and the small gear shaft 2 of the gear unit are connected by coupling with each other.

In the flexible plate type shaft coupling as described above, the flexible plate is deformed with respect to the relative displacement in the longitudinal direction and the radial direction between the motor shaft and the small gear shaft of the gear device caused by the displacement of the bogie frame. Although these displacements are allowed, the shaft joints for railway vehicles are required to be able to tolerate large displacements, and the transmission torque is large.

In order to allow a large displacement, it is advantageous to reduce the thickness of the flexible plate in order to reduce the bending stress. On the contrary, it is advantageous to make the flexible plate thick in torque transmission. Therefore, in the conventional flexible plate type shaft coupling, the thickness of one flexible plate is thinned and a plurality of the flexible plates are stacked and used. Especially, two or more flexible plates are provided on the drive shaft side and the driven shaft side, respectively. It is often used by stacking plates. However, when a plurality of flexible plates are stacked and used, when displacement occurs,
Relative displacement occurs at the mating surfaces of the flexible plates due to elastic deformation of the plates, and as a result, relative sliding occurs, causing wear and significantly reducing fatigue strength (fretting fatigue).

Further, in the flexural plate type shaft coupling for railway vehicles, the stress generated in the flexural plate is as follows: (1) the flexural plate is deformed to allow relative displacement between the motor shaft and the pinion shaft. The bending stress that occurs and (2) the tensile and compressive stresses that occur in the flexible plate for transmitting the torque of the motor include the bending stress, of which the bending stress of (1) is larger.

That is, in a flexural plate type shaft coupling for railway vehicles, since the stress generated on the surface of the flexural plate is large,
When a flaw is present on the surface of the flexible plate, there is a concern that cracks may occur due to stress concentration. In addition, in the conventional flexible plate type shaft coupling having the structure as shown in FIG. 8, the flexible plate is a thin flat plate having a square or annular shape, and is weak against impact.
It is sensitive to surface flaws due to the large bending stresses applied. Therefore, it is necessary to protect the flexible plate from scratches by flying stones or the like.

Further, since general steel does not satisfy the specifications for displacement and torque, the bending plate is made of special steel or CFRP.
(Carbon fiber reinforced plastic) or the like is used, but when CFRP is used in particular, it is very weak against impact force, and therefore it is necessary to similarly protect from impact force such as flying stones.

In order to protect the flexible plate, which is weak against impact force, from flying stones, it is necessary to attach a cover 9 for protection as shown in FIG. 9, for example.

[0009]

As described above, in the conventional flexible plate type shaft joint in which a plurality of flexible plates are stacked and used, fatigue deterioration such as fretting fatigue occurs at the mating surfaces, but fatigue The state of the mating surface, which easily deteriorates,
It cannot be observed without disassembling the shaft coupling.

Further, in the case of attaching the cover, in addition to the need to separately manufacture the cover, an attaching operation is additionally required. In addition, for railway vehicles, inspections are performed regularly without disassembling the vehicle, but in the case of a cover that covers the entire joint as shown in FIG. 9,
Since the cover cannot see the surface of the flexible plate, it was necessary to remove the cover during inspection.

The present invention has been made in view of the above-mentioned problems, and by making the joint body and the intermediate body also serve as a cover, the flexible plate is protected from flying stones and the like, while reducing the weight and increasing the number of parts. (EN) Provided is a flexural plate type shaft coupling for a railway vehicle, which is capable of eliminating a difficult-to-observe portion where fatigue deterioration is likely to occur, by preventing and shortening an assembling time, and by eliminating a mating surface between the flexural plates. Is intended.

[0012]

In order to achieve the above-mentioned object, a flexible plate type shaft joint for a railway vehicle according to the present invention has a flange outer peripheral surface of a joint body having a flange formed on the outer peripheral side thereof and projected toward the intermediate body side. While covering the outer peripheral surface of the flexible plate, one end side is connected at a position different from the position of the flexible plate that is connected at a position sandwiching the shaft core of the flange of each of these joint bodies, and the other end side of the intermediate body is connected. One end is extended outward so as to cover the side surface of the flexible plate opposite to the joint body. Then, by doing this, a cover for the flexible plate is separately manufactured,
The flexible plate can be covered without mounting.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A flexible plate type shaft coupling for a railway vehicle according to the present invention allows relative displacement of the drive shaft and the driven shaft between the shaft ends of the drive shaft and the driven shaft which are arranged to face each other on substantially the same axis. While, in the railroad vehicle shaft coupling for connecting to drive side torque to the driven shaft, mounted on the respective shaft ends,
Joint main bodies having flanges formed on the outer peripheral side, flexible plates connected at positions sandwiching the shaft cores of the flanges of the respective joint main bodies, one end side is connected at a position different from the position on these flexible plates, and the other end side A flexible plate having an intermediate body for connecting the two together, the outer peripheral surface of the flange of the joint body is projected toward the intermediate body to cover the outer peripheral surface of the flexible plate, and one end side of the intermediate body is extended outwardly. It is configured to cover the side surface on the side opposite to the joint body.

In the flexible plate type shaft coupling for a railway vehicle of the present invention, the outer peripheral surface of the flange of the joint body is projected toward the intermediate body to cover the outer peripheral surface of the flexible plate, and one end side of the intermediate body is extended outward. Since the side surface of the flexible plate opposite to the joint body is covered, flying stones do not collide with the flexible plate, and it is not necessary to separately manufacture and attach the flexible plate cover.

Further, in the flexible plate type shaft coupling for a railway vehicle of the present invention, the diameter of the outward extending portion on one end side of the intermediate body is
The diameter of the flexible plate is smaller than the diameter of the inner side of the mounting part of the flexible plate so that the flexible plate can be observed through the gap between the two, and the diameter and shape of the flange of the flexible body must be in the proper place. When the through-hole is provided, the surface of the flexible plate can be observed through the gap or the through-hole, so that it is possible to inspect whether or not the flexible plate is abnormal without disassembling. Here, it goes without saying that the sizes of the gaps and the through holes are such that flying stones do not directly collide with the flexible plate through the gaps and the through holes.

Further, in the bending plate type shaft coupling for railway vehicles of the present invention, when the bending plate mounting portion and the extending portion on one end side of the intermediate body are formed with a draft angle with respect to the direction perpendicular to the axis, The intermediate body can be easily manufactured by forging.

Further, in the case where no one piece of definitive flexural plate deflection plate type shaft joint hands for railway vehicles of the present invention described above, together with the mating surfaces of the prone deflection plates are fatigue degradation is eliminated, the shaft It becomes possible to observe the entire surface of the flexible plate without disassembling the joint. In addition, when the strength against the torque becomes too weak to make only one flexible plate, it is effective to improve the material of the flexible plate. Particularly when the material of the flexible plate is CFRP, it is effective to use a high-strength carbon fiber.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flexible plate type shaft coupling for a railway vehicle according to the present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a perspective view showing an embodiment of a flexural plate type shaft coupling for a railroad vehicle of the present invention, and FIG. 2A is a front view showing an embodiment of a flexural plate type shaft coupling for a railroad vehicle of the present invention. ) Is a side view, FIG. 3 is FIG.
FIG. 4B is a sectional view taken along the line A-A in FIG.
5A is a side view, FIG. 5B is a sectional view taken along line AA of FIG.
6A and 6B are views showing an embodiment of a bending plate that constitutes a bending plate type shaft coupling for a railroad vehicle of the present invention, in which FIG. 6A is a front view, FIG. FIG. 7B is a side view showing another embodiment of the flexural plate type shaft coupling for railway vehicles of the present invention, FIG.
FIG. 4 is a view similar to FIG. 3 in the case of using one flexible plate.

1 to 6, reference numeral 11 denotes a flexible plate type shaft coupling for a railway vehicle according to the present invention. For example, a shaft end of a motor shaft 1 and a shaft end of a small gear shaft 2 of a gear device are arranged opposite to each other on the same axis. , For example, a rectangular annular flexible plate 1 as shown in FIG.
The flexures 2 and 13 allow the relative displacement between the motor shaft 1 and the small gear shaft 2 while transmitting the torque of the motor to the small gear shaft 2.

Reference numeral 14 denotes a joint body mounted on the motor shaft 1 by, for example, taper shrink fitting, and reference numeral 15 denotes a joint body also mounted on the small gear shaft 2, for example, by taper shrink fitting. Is formed.

And, between these joint bodies 14 and 15,
The flange 1 of each of the joint bodies 14 and 15
The above-mentioned flexible plates 12 and 13 connected by bolts 18 and nuts 19 at two diagonal positions sandwiching the axis of 4a and 15a, and the flexible plates 12 and 13 described above.
Two different diagonal positions on the same plane as the point are connected by flexible plate mounting portions 16a and 17a formed on one end side by bolts 20 and nuts 21, and the other end side is formed on the other end side, for example, a circular shape. Intermediate bodies 16 and 1 connected by bolts 20 and nuts 21 at flange portions 16b and 17b of
Connect via 7.

In the flexible plate type shaft joint 11 for a railroad vehicle of the present invention, the outer peripheral surfaces of the flanges 14a and 15a of the joint bodies 14 and 15 are protruded toward the intermediate bodies 16 and 17 to form the flexible plates 12 and 13. In addition to covering the outer peripheral surface, one end side of the intermediate bodies 16 and 17 is extended outward so as to cover the side surfaces of the flexible plates 12 and 13 opposite to the joint bodies 14 and 15. 1 to 6, 1
4aa and 15aa are protrusions of the flanges 14a and 15a,
Reference numerals 16c and 17c denote extension portions of the intermediate bodies 16 and 17, respectively.

Bending plate type shaft coupling 11 for railway vehicles according to the present invention
Is the flanges 14a, 15 of the joint bodies 14, 15.
The outer peripheral surface of a is projected toward the intermediate bodies 16 and 17 to cover the outer peripheral surfaces of the flexible plates 12 and 13, respectively, and the intermediate body 1
Bending plates 12, 13 by extending one end side of 6, 17 outwardly
Since the side surfaces of the joint bodies 14 and 15 on the side opposite to the joint bodies 14 and 15 are covered, flying stones and the like do not directly collide with the flexible plates 12 and 13. Further, in the flexible plate type shaft coupling 11 for a railway vehicle of the present invention, it is not necessary to separately manufacture covers for the flexible plates 12 and 13 or to separately attach such covers, and no extra parts are required.

Further, in this embodiment, the diameters of the outwardly extending portions 16c and 17c on one end side of the intermediate bodies 16 and 17 are set so that the flexible plates 12 and 13 are attached to the flanges 14a and 15a of the joint bodies 14 and 15, respectively. Smaller than the inner diameter of the part,
As shown in FIG. 3, the flexible plate 1 is inserted through the gap between the two.
2 and 13 are made observable.

In addition, in this embodiment, the joint bodies 14 and 1 are
No. 5 through-hole 1 of the required diameter in the appropriate positions on the flanges 14a and 15a
4ab and 15ab are provided, and these through holes 14ab and 1 are provided.
The side surfaces of the flexible plates 12 and 13 can be observed through 5ab.

In this way, the inner peripheral side of the mounting portions of the flexible plates 12 and 13 in the flanges 14a and 15a of the joint bodies 14 and 15 and the outwardly extending portions 16c and 17c of one end side of the intermediate bodies 16 and 17, respectively. A gap is provided between the flexible plates 12 and 13 so that the flexible plates 12 and 13 are not exposed, or the joint bodies 14 and 1
When the through holes 14ab and 15ab having the required diameter and shape are provided at appropriate places on the flanges 14a and 15a of No. 5, it becomes possible to inspect whether or not there is any abnormality in the flexible plates 12 and 13 without disassembling. At the same time, the weight can be reduced.

Here, the shape of the through holes 14ab and 15ab is not particularly limited as long as flying stones do not directly collide with the bending plate through the through holes. For example, as shown in FIG. The elliptical shape as shown in FIG. 2 or the circular shape as shown in FIGS. 6A and 6B may be used. In addition, the flanges 14a of the joint bodies 14 and 15,
Also for the shape of 15a, FIG. 1 and FIG. 2 and FIG.
Needless to say, it may be a circular shape as shown in FIG. 6 or a rectangular shape as shown in FIG. In this case, it is desirable that the shapes of the intermediate bodies 16 and 17 are circular or square according to the shapes of the flanges 14a and 15a.

By the way, in the flexible plate type shaft joint 11 for railway vehicles of the present invention described above, the joint bodies 14 and 15 and the intermediate body 1 are used.
Since the shapes of 6 and 17 are complicated, if all are manufactured by machining, the cost is too high. On the other hand, in the case of manufacturing by forging, the number of steps required for processing is significantly reduced, and cost reduction can be achieved.

At this time, the flanges 1 of the joint bodies 14 and 15
Since the protrusions 14aa and 15aa formed on 4a and 15a extend in the axial direction, there is no problem.
Since the flexible plate mounting portions 16a, 17a and the extending portions 16c, 17c on one end side of the member 17 extend in the direction perpendicular to the axis, it is easy to cause thinning during forging. Therefore, the flexible plate mounting portions 16a and 17a and the extending portions 16c and 17c are
As shown in FIG. 4, when the draft is formed in the direction perpendicular to the axis, the intermediate bodies 16 and 17 can be easily manufactured by forging.

By the way, in addition to the embodiments of the flexible plate type shaft joint for a railroad vehicle of the present invention shown in FIGS. 1 to 6, the conventional flexible plate type shaft joint for a railroad vehicle as shown in FIG. 8 and FIG.
For example, two flexible plates were used in a stacked manner. However, when the flexible plates are used in an overlapping manner, fatigue deterioration such as fretting fatigue easily occurs on the mating surfaces, and the mating surfaces cannot be observed unless the shaft coupling is disassembled.

Therefore, in order to solve such a problem, by using a bending plate having a strength which is practically no problem even if only one sheet is used by improving the strength of the material, there is no mating surface between the bending plates. As a result, fatigue deterioration at the relevant portion is eliminated, and the entire surface of the flexible plate can be easily observed without disassembling the shaft coupling. Figure 1
7 shows an embodiment in which the bending plates 12 and 13 of the bending plate type shaft coupling for a railway vehicle of the present invention shown in FIG. 6 are one, but the effect of using one bending plate is shown in FIG. The same applies to the conventional flexural plate type shaft coupling for railroad vehicles as shown in FIG. If the number of the flexible plates is one, the material cost is increased due to the improvement of the material strength, but the cost is reduced as a whole because the number of the flexible plates is reduced.

[0032]

As described above, in the flexible plate type shaft joint for a railway vehicle according to the present invention, the flange of the joint body and the one end side of the intermediate body are provided with the cover function, so that the cover for the flexible plate is separately manufactured. It is possible to prevent the stepping stones, etc. from directly colliding with the flexible plate without attaching or separately attaching such a cover.

Further, in the bending plate type shaft coupling for a railway vehicle according to the present invention, the bending plate is provided between the inner peripheral side of the mounting portion of the bending plate in the flange portion of the joint body and the outward extending portion on one end side of the intermediate body. If there is a gap that does not expose the joint, or if a through hole of the required diameter and shape is provided in the flange of the joint body in the appropriate place, it is possible to inspect whether the bending plate is abnormal without disassembling. In addition, the weight can be reduced.

Further, in the flexible plate type shaft coupling for a railroad vehicle of the present invention, the flexible plate mounting portion and the extending portion in the intermediate body are
If the draft is formed in the direction perpendicular to the axis, the intermediate body can be easily manufactured by forging, and the cost can be reduced.

Further, in the case where no one piece of definitive flexural plate deflection plate type shaft joint hands for railway vehicles of the present invention described above, together with the mating surfaces of the prone deflection plates are fatigue degradation is eliminated, the shaft It becomes possible to observe the entire surface of the flexible plate without disassembling the joint. In addition, the number of flexible plates is reduced, so that the cost is also reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a flexural plate type shaft coupling for a railway vehicle of the present invention.

FIG. 2 (a) is a front view showing an embodiment of a flexible plate type shaft coupling for a railway vehicle of the present invention, and FIG. 2 (b) is a side view.

FIG. 3 is a sectional view taken along line AA of FIG.

4A and 4B are views showing an embodiment of an intermediate body which constitutes a flexural plate type shaft coupling for a railroad vehicle of the present invention, in which FIG. 4A is a side view and FIG.
FIG. 7A is a sectional view taken along line AA of FIG.

5A and 5B are views showing an embodiment of a bending plate that constitutes the bending plate type shaft coupling for a railway vehicle of the present invention, in which FIG. 5A is a front view and FIG.
FIG. 3 is a plan view showing a partial cross section.

6 (a) and 6 (b) are side views showing another embodiment of the flexible plate type shaft coupling for railway vehicles of the present invention.

FIG. 7 is a view similar to FIG. 3 in the case of using one flexible plate.

8A and 8B are explanatory views of a conventional flexible plate type shaft coupling, in which FIG. 8A is a longitudinal sectional view and FIG. 8B is a perspective view.

FIG. 9 is a vertical cross-sectional view when a cover is installed on a conventional flexible plate type shaft coupling.

[Explanation of symbols]

1 motor shaft 2 Small gear shaft 11 Shaft coupling 12 Flexible plate 13 Flexible plate 14 Joint body 14a flange 14aa protruding part 14ab through hole 15 Joint body 15a flange 15aa protrusion 15ab through hole 16 Intermediate 16a Flexible plate mounting part 16c extension part 17 Intermediate 17a Flexible plate mounting part 17c extension part

Claims (4)

(57) [Claims] 1. A drive shaft and a driven shaft, which are arranged to face each other on substantially the same axis, are connected to each other so as to transmit torque on the drive side to the driven shaft while allowing relative displacement between the drive shaft and the driven shaft. In a railroad vehicle shaft coupling, a joint body attached to each of the shaft ends and having a flange on the outer peripheral side, and a flexible plate connected at a position sandwiching the shaft core of the flange of each joint body, One end side is connected at a position different from the position of the flexible plate, and an intermediate body is provided that connects the other end sides to each other, and the flange outer peripheral surface of the joint body is projected toward the intermediate body side to cover the outer peripheral surface of the flexible plate, A flexible plate type shaft coupling for a railway vehicle, characterized in that one end of the intermediate body is extended outward to cover the side surface of the flexible plate opposite to the joint body. 2. The diameter of the outwardly extending portion on one end side of the intermediate body is made smaller than the diameter on the inner peripheral side of the mounting portion of the flexible plate on the flange portion of the joint body, and the flexible plate is observed from the gap between the two. The flexible plate type shaft coupling for a railway vehicle according to claim 1, wherein the flexible plate type shaft coupling for a railway vehicle is formed so as to be possible, and a through hole having a required diameter and shape is provided at an appropriate position of the flange portion of the joint body. 3. The flexure for a railway vehicle according to claim 1, wherein the flexing plate mounting portion and the extending portion on one end side of the intermediate body are formed with a draft angle with respect to a direction perpendicular to the axis. Plate type shaft coupling. 4. A flexural plate type shaft for a railway vehicle according to claim 1, wherein the flexural plate type shaft for a railway vehicle is constituted by one flexural plate which is connected at a position sandwiching a shaft core in a flange of each joint body. Fittings.