JP3401168B2 - Axle support structure for bogies 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 an axle support structure for a railroad vehicle bogie, and more particularly to an axle support structure suitable for use in a DDM type and axle beam type railcar bogie.

Conventionally, in a bogie for a railway vehicle, an axle that rotates integrally with a wheel is supported by a bogie frame on a bogie frame. However, since the axle is directly loaded with vibrations and impacts associated with traveling, If there is looseness in the axle support structure portion such as the above, early wear or damage will occur. In addition, the axle support structure portion absorbs vibrations and impacts applied to the axle to improve riding comfort, and by appropriately setting the spring characteristics of each spring portion interposed between the axle frame and the bogie frame. It must play a role in improving the running characteristics of railway vehicles.

[0003]

By the way, in recent years, for the purpose of simplifying the structure of the bogie and reducing the weight of the bogie, a DDM system (direct drive type) in which the axle is directly rotated by a drive motor without a reduction gear is used. Various motor-type carriages and shaft-beam type carriages having a structure in which a shaft box is attached to the swinging end of a shaft beam whose base end is axially supported by a carriage frame have been proposed. (JP-A-5-16800, JP-A-6-40
(See Japanese Patent No. 335)

In the case of the DDM type bogie, the axle support structure portion must not only support the axle but also receive the driving reaction force of the drive motor. Further, in the case of the axle beam type bogie, if both ends of the axle are fixed to the axle box, a large torsion moment acts on the axle when the bogie rolls as shown in FIG. 3, and the axle is damaged. Or the joint between the axle and the axle box may be damaged.

Therefore, an object of the present invention is to provide an axle support structure suitable for use in a DDM type or axle beam type bogie for railway vehicles.

[0006]

In order to solve the above-mentioned problems, an axle support structure for a bogie for a railroad vehicle according to claim 1 of the present invention has a front-rear direction end of which is pivotable on a bogie frame.
Provided integrally with the supported shaft beam and the swinging end of the shaft beam.
Mounted axle box and an interposition between the upper portion of the axle box and the bogie frame.
It is possible to relatively rotate the shaft spring and the axle
A shaft end block attached to the end of the axle and a plate-shaped bullet
A pair of elastic buffer plates sandwiching the elastic material between a pair of metal plates,
Prepare The shaft end block has a pair of axle box mounting surfaces arranged in a "H" shape with a narrower interval as seen from the axial direction of the axle. Further, the axle box has a pair of inner wall surfaces that can be brought into close contact with the pair of axle box mounting surfaces, respectively. The pair of elastic cushion plates are sandwiched by the shaft box and the shaft end block so as to be compressed in the thickness direction by the shaft box mounting surface and the inner wall surface. Further, a shaft collar located at a terminal end of the axle and a second elastic buffer plate sandwiching a plate-shaped elastic member between a pair of metal plates are further provided, and the second elastic buffer plate includes the shaft collar and The shaft end block and the end face of the shaft end block sandwich the shaft end block and the shaft end block so that the thickness direction thereof is compressed in the axial direction of the axle.

According to a second aspect of the present invention, in the axle support structure for a bogie for a railway vehicle, the front and rear ends thereof are bogie frames.
A shaft beam that is swingably supported on the shaft, and the swing end of the shaft beam.
And axle box provided integrally with, the upper of the axle box truck
A shaft spring which is interposed between the frame and the end portion on the pivotable relative fitted on the axle outer cylinder of the axle, which is rotatably supported through the wheel bearing to the axle barrel on a wheel, a drive motor having a wheel and the rotor and the stator mounted on an axle barrel rotates integrally with the shaft end block secured non-rotatably to an end of the axle outer cylinder, A pair of elastic cushion plates in which a plate-shaped elastic material is sandwiched by a pair of metal plates are provided. The shaft end block has a pair of axle box mounting surfaces arranged in a "H" shape with a narrower interval as seen from the axial direction of the axle. Further, the axle box has a pair of inner wall surfaces that can be brought into close contact with the pair of axle box mounting surfaces, respectively. The pair of elastic cushion plates are sandwiched by the shaft box and the shaft end block so as to be compressed in the thickness direction by the shaft box mounting surface and the inner wall surface. Preferably, a shaft collar located at a terminal end of the axle and a second elastic buffer plate sandwiching a plate-shaped elastic member between a pair of metal plates are further provided, and the second elastic buffer plate is the shaft collar. And the end surface of the shaft end block are sandwiched between the shaft flange and the shaft end block such that the thickness direction thereof is compressed in the axial direction of the axle.

That is, in the axle support structure for a bogie for railway vehicles according to claim 1 of the present invention, an elastic buffer plate is provided between the axle box mounting surface on the axle end block side and the inner wall surface on the axle box side. Since it is interposed, shocks and vibrations input to the axle can be buffered and transmitted to the axle box. Further, since the elastic buffer plate has a structure in which a plate-shaped elastic material is sandwiched between a pair of metal plates, the elastic modulus in the thickness direction can be increased and the elastic modulus in the shear direction can be reduced. Therefore, by changing the opening angle of the pair of shaft box mounting surfaces on the shaft end block side and the pair of inner wall surfaces on the shaft box side, the spring constants in the front-rear direction and the vertical direction between the shaft end block and the shaft box can be adjusted. Since it can be changed, the traveling characteristics of the bogie can be optimally set.
When the shaft end block is attached to the axle so as to be rotatable relative to the axle around the axis of the axle, a torsion moment is not applied to the axle even if the axle beam type bogie rolls. Further, since the second elastic buffer plate is interposed between the shaft flange formed at the end of the axle and the end surface of the shaft end block,
It is possible not only to eliminate play in the axial direction between the axle and the shaft end block, but also to dampen vibrations and impacts that are axially applied to the axle and transmit them to the shaft end block. In addition, the traveling characteristics of the bogie can be optimized by appropriately setting the spring characteristics of the second elastic cushioning plate.

In the axle support structure for a bogie for a railway vehicle according to a second aspect of the present invention, the axle is supported by the axle box via the axle outer cylinder and the axle end block. When the drive motor is energized, the rotor rotates and the wheels are driven to rotate. Then, the driving reaction force of the drive motor loaded on the outer cylinder of the axle and the vibrations and shocks loaded on the axle along with the traveling of the bogie are transmitted to the axle box after being damped by the elastic cushioning plate. Further, since the elastic buffer plate has a structure in which a plate-shaped elastic material is sandwiched between a pair of metal plates, the elastic modulus in the thickness direction can be increased and the elastic modulus in the shear direction can be reduced. Therefore, by changing the opening angle of the pair of shaft box mounting surfaces on the shaft end block side and the pair of inner wall surfaces on the shaft box side, the spring constants in the front-rear direction and the vertical direction between the shaft end block and the shaft box can be adjusted. Since it can be changed, the traveling characteristics of the bogie can be optimally set. On the other hand, since the axle can rotate relative to the axle outer cylinder, that is, with respect to the axle box about its axis, even if the axle box is configured as an axial beam type, the rolling moment of the truck causes the axle to twist. Is not loaded. Further, since the second elastic cushioning plate is interposed between the shaft flange formed at the end of the axle and the end surface of the shaft end block, it is possible to eliminate backlash in the axial direction between the axle and the shaft end block. Not only can this be done, but vibrations and impacts that are axially applied to the axle can be buffered and transmitted to the axle end block. In addition, the traveling characteristics of the bogie can be optimized by appropriately setting the spring characteristics of the second elastic cushioning plate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a railway vehicle drive device according to the present invention will be described in detail below with reference to FIGS. 1 and 2. Here, FIG. 1 is a front sectional view showing an axle support structure of a bogie for a railroad vehicle of the present invention, and FIG. 2 is shown in FIG.
FIG. 11 is a side sectional view taken along the line II-II of FIG. In the following description, the axial direction of the axle may be simply referred to as “axial direction”, and the traveling direction of the railcar bogie may be simply referred to as “front-rear direction”.

As shown in FIGS. 1 and 2, the axle support structure 100 for a bogie for a railroad vehicle according to the present embodiment is a DDM system (direct drive) in which the drive shaft is directly rotated by a drive motor without a reduction gear.・ Motor type) and a shaft beam type bogie in which a shaft box is attached to the swing end of a shaft beam whose base end is pivotally supported by a bogie frame.

As shown in FIG. 1, a cylindrical axle outer cylinder 10 is fitted to the end of the cylindrical axle 1 so as to be relatively rotatable about the axis of the axle 1. The relative rotation angle between the axle 1 and the axle outer cylinder 10 caused by rolling of the truck is about 3 degrees at maximum, but the fitting surfaces of both are lubricated so that the relative rotation can be smoothly performed within this range. Has been done. Further, by fitting a precision resin plate, which is made of a resin material such as polyamide having self-lubricating property, into a thin plate shape on the inner peripheral surface of the axle outer casing 10, the axle 1 and the axle outer casing 10 are fitted. It is also possible to smoothly rotate and. Further, a stepped protrusion 2 for positioning the axle outer cylinder 10 in the axial direction is provided at the center of the axle 1 in the axial direction.

A wheel 12 is rotatably supported by a wheel bearing 11 at the center of the axle outer cylinder 10 in the axial direction. A drive motor 20 for rotating the wheels 12 is mounted on the side of the wheels 12. The drive motor 20 has a cylindrical casing 21 as a rotor, and one end of the drive motor 20 is supported by a motor bearing 14 attached to a flange portion 13 standing on the end of the axle outer cylinder 10. , The other end is screwed onto the web 15 of the wheel 12. Further, the casing 2
A magnet 22 is attached to the inner peripheral surface of the stator 1, and an iron core and a coil (not shown) are attached to the outer peripheral surface of the axle outer cylinder 10 to form a stator 23. As a result, when the coil is energized, the casing 21 rotates and the wheels 12 are driven to rotate.

Further, as shown in FIG. 1, the axle outer cylinder 10
The shaft end block 30 is provided at the end of the axle outer side of the axle outer cylinder 10.
It is fitted so as not to be rotatable relative to. The shaft end block 30 connects the axle 1 to an axle box 40 described later, transmits the driving reaction force of the drive motor 20 loaded on the outer cylinder of the axle to the axle box 40, and further, via the spacer 16 It serves to fix the wheel bearing 11 in the axial direction. Further, as shown in FIG. 2, the axle end block 30 includes the axle 1
It has a pair of front and rear axle box mounting surfaces 31, 31 extending in parallel to the axis of the axle 1 and arranged in a “H” shape whose interval becomes narrower toward the top when viewed in the axial direction.
Then, by these shaft box mounting surfaces 31 and 31 and the upper end surface 32 that connects the upper end portions thereof and extends horizontally,
A saddle portion 33 on which the axle box 40 is placed is formed.
Further, as shown in FIG. 1, a pair of engagement flanges 34L, 34R engageable with the shaft box 40 in the axial direction are provided at both axial ends of the saddle portion 33. These engaging flanges 34L and 34R do not normally contact the shaft box 40, but when the shaft end block 30 is largely displaced in the axial direction due to some abnormality, the engaging flanges 34L and 34R engage with the shaft box 40 in the axial direction, and The box 40 is prevented from falling off the shaft end block 30. The pair of engaging flanges 3
Of the 4L and 34R, the engagement flange 34L on the shaft end side is disc-shaped, but the engagement flange 34R on the opposite side can be assembled by inserting the shaft end block 30 into the shaft box 40. It has a unique shape.

As shown in FIG . 2, the axle box 40 has a shaft beam 41 whose tip is supported by a bracket B of a bogie frame D.
And a cylindrical shaft box main body 42 integrally fixed to the swing end of the shaft beam. Inside the shaft box main body 42, a pair of inner wall surfaces 43, 43 that can be in close contact with the shaft box mounting surfaces 31, 31 of the shaft end block 30 and the shaft end block 3 are provided.
A ceiling surface 44 extending in parallel with the upper end surface 32 of 0 at a predetermined interval is formed. In addition, the axle box body 42
The lower end of the shaft end block 30 is in contact with the lower surface 35,
Shaft end block 30 assembled inside the axle box body 42
However, a shaft end block retaining pin 45 for preventing downward displacement inside the shaft box main body 42 is attached. Further, a spring seat 47 is attached to the upper surface 46 of the axle box body 42, and supports a pair of inner and outer axis springs 48, 49 interposed between the bogie frame D and the axle box body 42.

On the other hand, the shaft box mounting surface 3 of the shaft end block 30.
Elastic buffer plates 50 are respectively interposed between the inner wall surfaces 43, 43 of the axle box body 42. The elastic cushioning plate 50 is a member in which a pair of metal plates sandwiches an elastic plate formed in a plate shape from a polymer material such as a rubber material or an elastomer, and has an elastic modulus when it is compressed and deformed in the thickness direction. Than that, the elastic modulus at the time of shear deformation is lower.

Further, as shown in FIG. 1, between the disk-shaped shaft flange 3 detachably attached to the shaft end of the axle 1 and the side surface of the disk-shaped engagement flange 34L of the shaft end block 30. An annular second elastic cushioning plate 60 is interposed between the two. The second elastic cushioning plate 60 has substantially the same structure as the elastic cushioning plate 50 described above, and has a modulus of elasticity when sheared in the torsional direction rather than a modulus of elasticity when compressed and deformed in the thickness direction. It is set to be lower.

Next, the operation of the axle support structure 100 of the bogie for railway vehicle of the present embodiment configured as described above will be described.

First, the weight of the vehicle body of a railway vehicle (not shown) loaded on the bogie frame D is determined by the shaft springs 48, 49 and the spring seat 47.
Is loaded on the axle box main body 42 through. At this time, the axle box main body 42 and the axle end block 30 are vertically engaged with each other by the inner wall surfaces 43, 43, the elastic cushioning plate 50, and the axle box mounting surfaces 31, 31. Is the shaft end block 3 from the shaft box main body 42 via the elastic buffer plate 50.
Transmitted to 0. The vehicle body weight of the railway vehicle loaded on the shaft end block 30 is supported by the axle outer cylinder 10 and the axle 1, and finally transmitted from the wheels 12 to the rail R.

Further, vibrations and impacts acting on the wheels 12 as the vehicle travels are transmitted to the axle 1, the axle outer cylinder 10 and the axle end block 30 via the wheel bearings 11. At this time, the shaft end block 30 and the shaft box main body 42 have the shaft box mounting surfaces 31, 31, the elastic buffer plate 50, and the inner wall surfaces 43, 43.
Because it is engaged in the front-back direction and the up-down direction,
Vibrations and shocks associated with traveling are transmitted from the shaft end block 30 to the shaft box body 42 via the elastic cushioning plate 50. The vibration and shock transmitted to the axle box body 42 are transmitted to the bogie frame D via the shaft beam 41 and the shaft springs 48 and 49.

Further, the reaction force of the rotational driving force for rotating the wheel 12 by the drive motor 20 is transmitted to the axle box 40 via the axle outer cylinder 10, the shaft end block 30 and the elastic cushioning plate 50 to be received. At this time, the shaft end block 30 and the shaft box main body 42 are engaged around the axis of the axle 1 by the shaft box mounting surfaces 31, 31 and the elastic cushioning plate 50 and the inner wall surfaces 43, 43, so that the drive motor The driving reaction force of 20 is transmitted to the axle box body 42. The driving reaction force transmitted to the axle box body 42 is applied to the shaft beam 41 and the shaft springs 48, 49.
Is transmitted to the bogie frame D via.

Further, the external force in the axial direction received by the wheels 12 as the vehicle travels is transmitted to the axle 1 through the axle outer cylinder 10 and the stepped projection 2 of the axle 1. At this time, since the second elastic cushioning plate 60 is interposed between the shaft flange 3 of the axle 1 and the shaft end block 30, the external force in the axial direction applied to the axle 1 causes the second elastic cushioning. After being buffered by the plate 60, it is transmitted to the shaft end block 30. Further, since the shaft end block 30 is frictionally engaged with the axle box body 42 via the elastic buffer plate 50, the external force in the axial direction that finally acts on the axle 1 is transmitted to the axle box body 42.

That is, in the axle support structure 100 for a bogie for a railway vehicle according to the present embodiment, the elastic cushion plate 50 is interposed between the shaft end block 30 and the shaft box body 42, and the shaft end block 30 and Since the second elastic cushioning plate 60 is interposed between the axle 1 and the axle 1, the axle end block 30 and the axle box main body 42 do not come into direct metal contact with the axle end block 30 and the axle 1. Further, vibrations, impacts, and drive reaction forces applied to the axle 1 and the axle outer cylinder 10 as the vehicle travels are damped by the elastic cushioning plate 50 and the second elastic cushioning plate 60, and then the shaft end block 30 and the shaft end block 30. It is transmitted to the box body 42. As a result, it is possible to prevent generation of metallic noise and wear due to contact between the shaft end block 30 and the shaft box main body 42 and between the shaft end block 30 and the axle 1, and to improve maintainability.

Further, the compression elastic modulus in the thickness direction and the elastic modulus of shear deformation of the elastic cushioning plate 50 and the second elastic cushioning plate 60,
Further, the axle 1 and the axle outer cylinder 10 are supported in the front-rear direction by optimally setting the opening angles of the axle box mounting surfaces 31, 31 of the axle end block 30 and the inner wall surfaces 43, 43 of the axle box main body 42. Since the spring constant can be set high and the spring constant supporting the vertical direction and the axial direction can be set low, a high-performance cart suitable for high-speed traveling can be configured.

On the other hand, when the axle beam type bogie for railway vehicle rolls, an angle difference is generated between the pair of left and right axle box main bodies as shown in FIG. However, in the axle support structure 100 for a bogie for railway vehicles according to the present embodiment, the axle outer cylinder 10 and the axle 1 that are fixed to the axle end block 30 that engages with the axle box body 42 are arranged around the axis of the axle 1. Since the shaft-type railcar bogie is rolling, the axle 1 is not subjected to a torsional moment, and the axle 1 is not damaged. In addition, the second elastic buffer plate 6 interposed between the axle 1 and the shaft end block 30.
Since 0 can absorb the relative angular change between the axle 1 and the shaft end block 30 by shearing around the axle of the axle 1, even if the axle 1 is loaded with a torsional moment, all parts It will not be damaged.

Although one embodiment of the axle support structure for a bogie for a railway vehicle according to the present invention has been described above in detail, the present invention is not limited to the above-mentioned embodiment.
It goes without saying that various modifications are possible. For example, in the above-described embodiment, the shaft beam type bogie is described as an example, but it goes without saying that the present invention can be applied to bogies having other structures. Further, it can be applied to a variable gauge carriage that can continuously run on rails having different gauge dimensions, such as a bullet train and a conventional line. Further, the outer casing 10 of the axle and the stepped projection 2 of the axle 1
It is also possible to interpose a third elastic buffer plate between and.

[0027]

As is clear from the above description, according to the axle support structure for a bogie for a railway vehicle of the present invention, between the axle end block fixed to the axle outer cylinder and the axle box, and between the axle end block. Since elastic cushioning plates are respectively interposed between the shaft collars, vibrations and shocks associated with running and external force in the axial direction act on the axle, and the drive reaction force of the drive motor acts on the axle outer cylinder. In addition, the shaft end block and the shaft box do not come into metal contact with each other and the shaft end block and the shaft flange do not contact with each other, so that abnormal noise and wear due to the contact can be prevented and the maintainability can be improved. Also, by optimizing the compression elastic modulus in the thickness direction of both elastic cushioning plates and the elastic modulus of shear deformation, and the opening angle of the shaft box mounting surface of the shaft end block, the axle and the outer cylinder of the axle are set in the front-back direction. It is possible to support a high spring constant that is elastically supported and a low spring constant that is elastically supported in the vertical direction and the axial direction, so that a high-performance bogie suitable for high-speed traveling can be configured. further,
Since the axle is supported so as to be rotatable relative to the axle box, that is, the axle end block, around the axis of the axle, even if the axle-type railcar bogie rolls, no torsion moment acts on the axle, and Will not be damaged. Therefore, according to the axle support structure of the bogie for railway vehicles of the present invention,
Even when applied to a DDM type bogie in which a drive motor directly rotates an axle, and an axle beam type bogie in which an axle box is attached to a swing end of an axle beam supported by a bogie frame,
It is possible to provide a suitable axle support structure without applying unreasonable force to the axle box or axle, or causing backlash.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing an axle support structure of a bogie for railway vehicles of the present invention,

FIG. 2 is a side sectional view showing an axle support structure of a bogie for railway vehicles according to the present invention.

FIG. 3 is a side view showing a state in which the axle beam carriage is rolling.

[Explanation of symbols]

B Bracket C Shaft beam swing center D Bogie frame R Railroad 1 Axle 2 Stepped protrusion 3 Shaft collar 10 Axle outer cylinder 11 Wheel bearing 12 Wheel 13 Flange portion 14 Motor bearing 15 Web 16 Spacer 20 Drive motor 21 Casing (rotor ) 22 magnet 23 stator 30 shaft end block 31 shaft box mounting surface 32 upper end surface 33 saddle 34 engaging flange 35 lower surface 40 shaft box 41 shaft beam 42 shaft box body 43 inner wall surface 44 ceiling surface 45 retaining pin 46 upper surface 47 Spring seats 48, 49 Axial springs 50 Elastic buffer plates 60 Second elastic buffer plates 100 Axle support structure for a bogie for railroad vehicles according to the present invention

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Minowa 3-9-6 Osawa, Mitaka City, Tokyo Inside Subaru Research Co., Ltd. (56) Reference JP-A-60-76465 (JP, A) JP Japanese Unexamined Patent Publication No. 8-332951 (JP, A) Japanese Unexamined Patent Publication No. 8-332950 (JP, A) Japanese Unexamined Patent Publication No. 5-16800 (JP, A) Japanese Unexamined Patent Publication No. 6-40335 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) B61F 5/30 B61F 5/32

Claims (3)

(57) [Claims] 1. A front and rear direction end of the bogie frame is swingable.
A shaft beam supported by a shaft, a shaft box integrally provided at a swing end of the shaft beam, and a shaft spring interposed between an upper portion of the shaft box and the bogie frame.
At the end of the axle so that it can rotate relative to the axle.
A shaft end block attached, comprises a pair of elastic buffer plate which is sandwiched between the plate-shaped elastic member by a pair of metal plates, and the shaft end block, closely spaced enough upward as viewed from the axial direction of the axle Having a pair of axle box mounting surfaces arranged in a “C” shape, wherein the axle box has a pair of inner wall surfaces that can be closely attached to the pair of axle box mounting surfaces, respectively. The elastic cushion plate is sandwiched by the axle box and the shaft end block so as to be compressed in the thickness direction by the axle box mounting surface and the inner wall surface. Bogie axle support structure. 2. The front and rear ends of the bogie frame are swingable.
A shaft beam supported by a shaft, a shaft box integrally provided at a swing end of the shaft beam, and a shaft spring interposed between an upper portion of the shaft box and the bogie frame.
And an axle outer cylinder fitted on the end of the axle so as to be relatively rotatable.
And is rotatably supported on the axle casing via wheel bearings.
The wheel, the rotor that rotates integrally with the wheel, and the axle outer cylinder.
A drive motor having a stator attached thereto, and a shaft end block fixed to the end of the axle outer cylinder so as not to rotate relative to each other.
Lock and a pair of elastic cushions sandwiching a plate-shaped elastic material with a pair of metal plates
A plate, and the shaft end block is upward when viewed from the axial direction of the axle.
A pair of axle boxes arranged in a "C" shape with a narrower spacing
A mounting surface, and the shaft box is closely packed with the pair of shaft box mounting surfaces.
There are a pair of inner wall surfaces that can be attached, and the pair of elastic cushion plates are the shaft box mounting surface and the inner wall surface.
With the axle box so that it is compressed in the thickness direction by
It is sandwiched by the shaft end block,
Axle support structure for bogies for railway vehicles. 3. A second elastic cushion in which a shaft collar located at the end of the axle and a plate-shaped elastic member are sandwiched between a pair of metal plates.
A second elastic cushioning plate , wherein the second elastic cushioning plate includes the shaft collar and the shaft end block.
Depending on the end face of the wheel, the thickness direction is the axial direction of the axle.
And the shaft end block so as to be compressed in the direction
It is sandwiched by.
2. An axle support structure for a bogie for railway vehicles according to 2.