Bogie frame for railcar

Abstract

To improve strength and to facilitate manufacture and maintenance in a truck frame for a railroad vehicle.SOLUTION: A bogie frame for a railcar according to one aspect of the present disclosure includes a cross beam, and a gearbox hanging device fixed to the cross beam and configured to support a gearbox configured to transmit power of a traction motor to a wheel, wherein the gearbox hanging device includes a gearbox hanging base fixed to the cross beam, and a gearbox hanging receiving seat disposed at a distal end portion of the gearbox hanging base and to which an end portion of a hanging link extending from the gearbox is fixed, and a part of the gearbox hanging base and the gearbox hanging receiving seat are integrated.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a bogie frame for a rail vehicle. [Background technology]

[0002] Patent Document 1 describes a bogie frame for a railway vehicle. The bogie frame for a railway vehicle includes a cross beam and a gear box hoisting device that is fixed to the cross beam and supports a gear box that transmits power from a main motor to wheels. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-081308 Summary of the Invention [Problem to be solved by the invention]

[0004] In a bogie frame for a railway vehicle such as that disclosed in Patent Document 1, the gear box hoisting device may include a gear box hoisting base fixed to a cross beam of the bogie frame and a gear box hoisting seat welded to the tip of the gear box hoisting base. However, such a gear box hoisting device has room for improvement in terms of strength. In addition, there are problems with the time and effort required for manufacturing and maintenance.

[0005] Therefore, an object of the present disclosure is to improve the strength of a bogie frame for a railway vehicle and to facilitate manufacturing and maintenance. [Means for solving the problem]

[0006] A bogie frame for a railway vehicle according to one embodiment of the present disclosure comprises a cross beam and a gear box lifting device fixed to the cross beam and supporting a gear box that transmits the power of a main motor to wheels, the gear box lifting device including a gear box lifting base fixed to the cross beam and a gear box lifting seat disposed at the tip of the gear box lifting base and having an end of a lifting link extending from the gear box fixed thereto, and a part of the gear box lifting base and the gear box lifting seat are integral with each other. [Effects of the Invention]

[0007] According to the present disclosure, the strength of a bogie frame for a railway vehicle can be improved and manufacturing and maintenance can be facilitated. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a bogie frame for a railway vehicle according to an embodiment, as viewed from above. [Figure 2] FIG. 2 is a side view of the gear box, the gear box hoisting device and their surroundings in FIG. 1 as viewed from the vehicle width direction. [Figure 3] 3 is an enlarged side view of the gear box hoisting device and the cross beam of FIG. 2 as viewed from the vehicle width direction. [Figure 4] FIG. 4 is an enlarged plan view of the gear box hoisting device and the cross beam of FIG. 2 as viewed from above. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. In the following description, the direction in which a car body to which a railway vehicle bogie chassis 1 according to the embodiment is attached extends is defined as the vehicle longitudinal direction, and the lateral direction perpendicular to the vehicle longitudinal direction is defined as the vehicle width direction.

[0010] FIG. 1 is a plan view of a railway vehicle bogie frame 1 according to an embodiment, as viewed from above. As shown in FIG. 1, the railway vehicle bogie frame 1 has a cross beam 1a extending in the vehicle width direction, and a pair of side beams 1b connected to both ends of the cross beam 1a in the vehicle width direction and extending in the vehicle longitudinal direction. The railway vehicle bogie frame 1 has a pair of wheel sets 2 arranged spaced apart from each other in the vehicle longitudinal direction. Each of the pair of wheel sets 2 has an axle 2a extending along the vehicle width direction and a pair of wheels 2b fixed to both ends of the axle 2a. A gear box 4 is connected to the wheel set 2. A traction motor 3 is connected to the gear box 4. The driving force of the traction motor 3 is transmitted to the axle 2a via the gear box 4. Two traction motors 3 and two gear boxes 4 are arranged in the railway vehicle bogie frame 1.

[0011] The bogie frame 1 for railway vehicles further includes a traction motor hoisting device 5 that is fixed to the cross beam 1a and supports the traction motor 3, and a gear box hoisting device 6 that is fixed to the cross beam 1a adjacent to the traction motor hoisting device 5 and supports the gear box 4. As described above, two traction motors 3 and two gear boxes 4 are arranged in the bogie frame 1 for railway vehicles. Accordingly, in this embodiment, the bogie frame 1 for railway vehicles includes two traction motor hoisting devices 5 and two gear box hoisting devices 6. The two traction motor hoisting devices 5 have the same structure. The two gear box hoisting devices 6 also have the same structure. Therefore, unless particularly necessary, only one traction motor hoisting device 5 and gear box hoisting device 6 will be described below, and similar descriptions of the other traction motor hoisting device 5 and gear box hoisting device 6 will not be repeated.

[0012] Fig. 2 is a side view of the gearbox 4, gearbox hoisting device 6, and their surrounding areas in Fig. 1, viewed from the vehicle width direction. As shown in Fig. 2, a reducer 4a is arranged inside the gearbox 4. The reducer 4a has a first gear 4b that rotates around the output shaft 3a of the main electric motor 3 together with the output shaft 3a, and a second gear 4c that meshes with the first gear 4b and rotates around the axle 2a together with the axle 2a. The second gear 4c has a larger diameter than the first gear 4b. With the above structure, the rotational power of the main electric motor 3 is reduced and transmitted to the axle 2a via the reducer 4a, thereby rotating the wheels 2b.

[0013] The gear box 4 is supported by the gear box lifting device 6 via a suspension link 7. An upper end 7a as an end of the suspension link 7 is fixed to a gear box suspension seat 20 (described later) of the gear box lifting device 6 by a pair of push plates 25, a pair of elastic bodies 26, and a nut 27. The upper end 7a of the suspension link 7 is rod-shaped and has a central axis AX that extends at an angle relative to the vertical direction.

[0014] The upper end portion 7a of the suspension link 7 is inserted through the insertion hole 23 of the gear box suspension seat 20, the insertion hole 25a of each of the pair of press plates 25, and the insertion hole 26a of each of the pair of elastic bodies 26, so that the gear box suspension seat 20 is sandwiched between one elastic body 26 and the other elastic body 26, and one press plate 25 and the other press plate 25 sandwich the pair of elastic bodies 26 and the gear box suspension seat 20. Then, a nut 27 is screwed onto the portion of the upper end portion 7a of the suspension link 7 that protrudes from one press plate 25 located above the gear box suspension seat 20, whereby the upper end portion 7a of the suspension link 7 is fixed to the gear box suspension seat 20.

[0015] The lower end 7b of the suspension link 7 is connected to the gearbox 4 via a swing shaft 7c extending in the vehicle width direction. The suspension link 7 is capable of swinging about the swing shaft 7c in a plane perpendicular to the vehicle width direction. With the above-described structure, the suspension link 7 absorbs the shock that the gearbox 4 receives while the railway vehicle is running, thereby reducing the transmission of the shock to the gearbox suspension device 6.

[0016] Fig. 3 is an enlarged side view of the gear box hoisting device 6 and cross beam 1a of Fig. 2, viewed from the vehicle width direction. Fig. 4 is an enlarged plan view of the gear box hoisting device 6 and cross beam 1a of Fig. 2, viewed from above. As shown in Figs. 3 and 4, the gear box hoisting device 6 includes a gear box hoisting base 10 fixed to the cross beam 1a, and a gear box hoisting seat 20 that is disposed at the tip of the gear box hoisting base 10 and to which an upper end 7a of the hoisting link 7 shown in Fig. 2, which extends from the gear box 4, is fixed.

[0017] The gear box suspension support 10 includes an upper wall portion 11, a pair of side wall portions 12 extending downward from both sides of the upper wall portion 11 in the vehicle width direction, and a lower wall portion 13 connecting the lower ends of the pair of side wall portions 12.

[0018] The upper wall portion 11 includes a base end portion 11a that protrudes and extends from the cross beam 1a, a tip end portion 11b where the gearbox suspension seat 20 is disposed, and a transition portion 11c that connects the tip end portion 11b to the base end portion 11a. The thickness of the tip end portion 11b of the upper wall portion 11 is greater than the thickness of the base end portion 11a of the upper wall portion 11.

[0019] Each of the pair of side walls 12 has a groove 12a recessed toward the tip end at the base end edge in the direction in which the gear box sling base 10 protrudes from the cross beam 1a. When viewed from the vehicle width direction, the groove 12a has an arc shape corresponding to the outer wall of the cross beam 1a. With the cross beam 1a fitted into the groove 12a, the base end edge 11d of the upper wall 11 and the groove 12a of each of the pair of side walls 12 are welded to the cross beam 1a, thereby fixing the gear box sling base 10 to the cross beam 1a.

[0020] The gear box hanging base 10 further includes a reinforcing plate 18 that extends vertically and connects the central portion in the vehicle longitudinal direction of the lower surface of the upper wall portion 11, in other words, the transition region 29c of the lower surface 29 of a one-piece plate 28 (described later), to the lower wall portion 13. The reinforcing plate 18 extends in a plane perpendicular to the vehicle longitudinal direction, and extends from one side wall portion 12 to the other side wall portion 12 along the vehicle width direction.

[0021] The gear box hanging base 10 further includes a pair of protruding plates 14 extending downward from the center in the vehicle width direction of the lower surface of the lower wall portion 13 and spaced apart in the vehicle width direction, and a connecting plate 15 extending in the vehicle width direction to connect the pair of protruding plates 14. Each of the pair of protruding plates 14 extends in a plane perpendicular to the vehicle width direction. Each of the pair of protruding plates 14 has a hole 14a at its lower end. A fall prevention pin 16 is inserted into each of the holes 14a of the pair of protruding plates 14.

[0022] Returning to Figure 2, between the pair of protruding plates 14 and above the fall prevention pin 16 is located the tip of a fall prevention plate 17 which protrudes from the end of the gearbox 4 on the cross beam 1a side in the vehicle longitudinal direction towards the cross beam 1a and extends in a plane perpendicular to the vehicle width direction. With this structure, for example, even if the lower end 7b of the suspension link 7 comes off the gearbox 4, the tip of the fall prevention plate 17 is supported from below by the fall prevention pin 16, preventing the gearbox 4 from falling onto the rails.

[0023] 3 and 4, the gear box hanging seat 20 has a first recess 21 recessed from the upper surface of the upper wall portion 11 of the gear box hanging base 10 and having an arc-shaped outer edge when viewed in the thickness direction of the gear box hanging seat 20, a second recess 22 recessed from the lower surface of the upper wall portion 11 of the gear box hanging base 10 and having the same shape and size as the first recess 21 and arranged to overlap with the first recess 21 when viewed in the thickness direction, an insertion hole 23 located in the center of the first recess 21 and the second recess 22 when viewed in the thickness direction and having an arc-shaped outer edge, and a through hole 24 extending from the tip edge of the gear box hanging seat 20 to the insertion hole 23 and having a rectangular outer edge when viewed in the thickness direction. The lower end of one elastic body 26 described with reference to Fig. 2 is fitted into the first recess 21, and the upper end of the other elastic body 26 described with reference to the same figure is fitted into the second recess 22.

[0024] The welds 19a to 19d in the gear box hoisting device 6 will now be described. In Fig. 3 and Fig. 4, the welds 19a to 19d are schematically shown by hatching. Because the welds 19a to 19d cannot be seen from the outside, their outer edges are shown by dashed lines. The lower surface of the upper wall portion 11, in other words, the lower surface 29 of a one-piece plate 28 (described later), and the upper end surfaces of the pair of side wall portions 12 are fixed to each other by welds 19a. The upper surface of the lower wall portion 13 and the lower end surfaces of the pair of side wall portions 12 are fixed to each other by welds 19b. The center of the lower surface of the upper wall portion 11 in the vehicle longitudinal direction, in other words, the transition region 29c of the lower surface 29 of the one-piece plate 28 (described later) and the upper end surface of the reinforcing plate 18 are fixed to each other by welds 19c. The upper surface of the lower wall portion 13 and the lower end surface of the reinforcing plate 18 are fixed to each other by welds 19d.

[0025] A part of the gear box hanging base 10 and the gear box hanging seat 20 are integral. In this embodiment, this part is the upper wall portion 11 of the gear box hanging base 10. In Figures 3 and 4, a boundary portion 30 between the upper wall portion 11 of the gear box hanging base 10 and the gear box hanging seat 20 is shown by a dashed dotted line. In this embodiment, the boundary portion 30 extends in an arc shape along the outer edge of the first recess 21 so as to include the first recess 21 when viewed from above, and extends in an arc shape along the outer edge of the second recess 22 so as to include the second recess 22 when viewed from below.

[0026] The upper wall portion 11 of the gear box suspending base 10 and the gear box suspending seat 20 are a one-piece plate 28. The one-piece plate 28 protrudes obliquely upward from the cross beam 1a at a predetermined angle with respect to the horizontal direction so that the suspending link 7 is fixed to the gear box suspending seat 20 at an angle with respect to the vertical direction. Specifically, the central axis AX of the upper end portion 7a of the suspending link 7 is fixed to the gear box suspending seat 20 at an angle with respect to the vertical direction.

[0027] The underside 29 of the one-piece plate 28 includes a base end region 29a which is the underside of the base end portion 11a of the upper wall portion 11 and extends from the cross beam 1a at a predetermined angle with respect to the horizontal direction, a tip end region 29b which is the underside of the tip end portion 11b of the upper wall portion 11 and extends at a predetermined angle with respect to the horizontal direction, and a transition region 29c which is the underside of the transition portion 11c of the upper wall portion 11 and connects the base end region 29a to the tip end region 29b and extends horizontally.

[0028] According to the configuration described above, a portion of the gear box suspending base 10 and the gear box suspending seat 20 are integral, and therefore the boundary portion 30 between the portion of the gear box suspending base 10 and the gear box suspending seat 20 can be made stronger than in the prior art, in which the portion of the gear box suspending base and the gear box suspending seat are welded to each other. Furthermore, compared to the prior art, welding work and non-destructive testing of the boundary portion 30 are not required, making manufacturing and maintenance easier. If the rails on which a railway vehicle runs have relatively many irregularities and distortions, for example, and the rails are not precise, a relatively large impact is transmitted from the pair of wheels 2b to the gear box suspending device 6 while the railway vehicle is traveling. The railway vehicle bogie frame 1 is suitable for railway vehicles that run on such rails.

[0029] Since the thickness of the tip portion 11b of the upper wall portion 11 where the gear box hanging seat 20 is arranged is greater than the thickness of the base portion 11a of the upper wall portion 11, the gear box hanging seat 10 is made strong due to its three-dimensional structure, and the boundary portion 30 between the upper wall portion 11 of the gear box hanging seat 10 and the gear box hanging seat 20 can be made even stronger.

[0030] Even in the case of the gear box lifting device 6 that supports the gear box 4 by suspending it at an angle, the gear box lifting support 10 can be easily fixed at the correct angle to the cross beam 1a by performing the assembly work with the transition area 29c of the underside 29 of the one-piece plate 28 as the horizontal reference plane H shown by the dashed dotted line in Figure 3.

[0031] Since the gear box suspending base 10 is provided with a reinforcing plate 18 extending in the vertical direction, even if the one-piece plate 28 is arranged at a predetermined angle with respect to the horizontal direction, the strength of the gear box suspending base 10 can be easily increased against vertical stress generated therein.

[0032] The technology of the present disclosure is not limited to the above-described configuration.

[0033] In the above embodiment, the gear box hanging seat 20 has the first recess 21 and the second recess 22 that have arc-shaped outer edges when viewed in the thickness direction of the gear box hanging seat 20. However, this is not limited to this, and for example, the first recess 21 and the second recess 22 may each have a polygonal outer edge when viewed in the thickness direction, or may have an outer edge with another shape. Alternatively, the gear box hanging seat 20 may have another form that does not have the first recess 21 and the second recess 22.

[0034] In the above embodiment, the boundary portion 30 between the upper wall portion 11 of the gear box hanging base 10 and the gear box hanging seat 20 extends in an arc shape along the outer edge of the first recess 21 so as to include the first recess 21 when viewed from above, and extends in an arc shape along the outer edge of the second recess 22 so as to include the second recess 22 when viewed from below. However, this is not limiting, and for example, the boundary portion 30 may extend in an arc shape so as to overlap with the outer edge of the first recess 21 when viewed from above, and extend in an arc shape so as to overlap with the outer edge of the second recess 22 when viewed from below.

[0035] In the above embodiment, the case has been described where the thickness of the tip portion 11b of the upper wall portion 11 is greater than the thickness of the base end portion 11a of the upper wall portion 11. However, this is not limiting, and for example, the thickness of the tip portion 11b may be the same as the thickness of the base end portion 11a.

[0036] In the above embodiment, a case has been described in which a part of the gear box hanging base 10, which is integral with the gear box hanging seat 20, is the upper wall portion 11. However, this is not limited to this case, and for example, the part may include at least one of the pair of side wall portions 12, the lower wall portion 13, and the reinforcing plate 18 in addition to the upper wall portion 11.

[0037] In the above embodiment, the case where the lower surface 29 of the one-piece plate 28 and the upper end surfaces of the pair of side wall portions 12 are fixed to each other by welds 19a that are not visible from the outside has been described. However, this is not limited to this case, and the lower surface 29 of the one-piece plate 28 and the upper end surfaces of the pair of side wall portions 12 may be fixed to each other by other welds that are visible from the outside in addition to being fixed to each other by welds 19a. Similarly, the upper surface of the bottom wall portion 13 and the lower end surfaces of the pair of side wall portions 12 may be fixed to each other by other welds that are visible from the outside in addition to being fixed to each other by welds 19b that are not visible from the outside.

[0038] In the above embodiment, a case has been described in which the one-piece plate 28 protrudes obliquely upward from the cross beam 1a at a predetermined angle with respect to the horizontal direction so that the suspension link 7 is fixed to the gear box suspension seat 20 at an angle with respect to the vertical direction. However, this is not limiting, and for example, the one-piece plate 28 may protrude horizontally from the cross beam 1a so that the suspension link 7 is fixed to the gear box suspension seat 20 without being tilted with respect to the vertical direction.

[0039] In the above embodiment, a description has been given of a case where the bogie frame 1 for a railway vehicle includes two each of the traction motors 3, gearboxes 4, traction motor hoisting devices 5, and gearbox hoisting devices 6. However, this is not limiting, and the bogie frame 1 for a railway vehicle may include one each of the traction motors 3, gearboxes 4, traction motor hoisting devices 5, and gearbox hoisting devices 6, or three or more each.

[0040] Each of the following aspects is a disclosure of a preferred embodiment. [Aspect 1] The cross beam and a gear box hoisting device fixed to the cross beam and supporting a gear box that transmits power from the main motor to wheels, The gear box suspending device is a gear box suspension base fixed to the cross beam; a gear box suspension seat disposed at a tip end of the gear box suspension base and to which an end of a suspension link extending from the gear box is fixed, A bogie frame for a railway vehicle, wherein a portion of the gear box hanging base and the gear box hanging seat are integrated together. [Aspect 2] the gear box hanging base includes an upper wall portion which is the part, and a pair of side wall portions which extend downward from both side portions of the upper wall portion, The upper wall portion of the gear box hanging support is a base end portion extending from the cross beam; a tip portion where the gearbox suspension seat is disposed, Aspect 1. The bogie chassis for a railway vehicle according to aspect 1, wherein the base end portion of the upper wall portion has a plate thickness greater than the plate thickness of the tip end portion of the upper wall portion. [Aspect 3] the upper wall portion of the gear box hanging base and the gear box hanging seat are one-piece plates that protrude obliquely upward from the cross beam at a predetermined angle with respect to the horizontal direction so that the hanging link is fixed to the gear box hanging seat with an inclination with respect to the vertical direction, The bottom surface of the one-piece plate is a base end region that is a lower surface of the base end portion of the upper wall portion and extends from the cross beam at the predetermined angle with respect to the horizontal direction; a tip region on a lower surface of the tip portion of the upper wall portion, the tip region extending at the predetermined angle with respect to a horizontal direction; a horizontally extending transition region connecting the base region to the tip region. [Aspect 4] The gear box hanging support is a lower wall portion connecting lower ends of the pair of side wall portions; Aspect 4. The bogie chassis for a railway vehicle according to aspect 3, further including: a reinforcing plate connecting the transition region and the lower wall portion and extending in a vertical direction. [Explanation of symbols]

[0041] 1. Bogie frames for railway vehicles 1a crossbeam 2b wheels 3 Main motor 4 Gearbox 6 Gear box lifting device 7 Hanging link 7a Upper end (end) 10 Gear box suspension stand 11 Upper wall 11a Proximal part 11b Tip part 12 Pair of side walls 13 Lower wall part 18 Reinforcement plate 20 Gear box suspension seat 28 One-piece board 29 Bottom side 29a Proximal region 29b Tip area 29c transition region

Claims

1. The cross beam and a gear box hoisting device fixed to the cross beam and supporting a gear box that transmits power from the main motor to wheels, The gear box suspending device is a gear box suspension base fixed to the cross beam; a gear box suspension seat disposed at a tip end of the gear box suspension base and to which an end of a suspension link extending from the gear box is fixed, A bogie frame for a railway vehicle, wherein a portion of the gear box hanging base and the gear box hanging seat are integrated together.

2. the gear box hanging base includes an upper wall portion which is the part, and a pair of side wall portions which extend downward from both side portions of the upper wall portion, The upper wall portion of the gear box hanging support is a base end portion extending from the cross beam; a tip portion where the gearbox suspension seat is disposed, The bogie chassis for a railway vehicle according to claim 1 , wherein the plate thickness of the tip end portion of the upper wall portion is greater than the plate thickness of the base end portion of the upper wall portion.

3. the upper wall portion of the gear box hanging base and the gear box hanging seat are one-piece plates that protrude obliquely upward from the cross beam at a predetermined angle with respect to the horizontal direction so that the hanging link is fixed to the gear box hanging seat with an inclination with respect to the vertical direction, The bottom surface of the one-piece plate is a base end region that is a lower surface of the base end portion of the upper wall portion and extends from the cross beam at the predetermined angle with respect to the horizontal direction; a tip region on a lower surface of the tip portion of the upper wall portion, the tip region extending at the predetermined angle with respect to a horizontal direction; 3. The bogie chassis for a rail vehicle according to claim 2, further comprising: a horizontally extending transition region connecting the base end region to the tip end region.

4. The gear box hanging support is a lower wall portion connecting lower ends of the pair of side wall portions; The bogie chassis for a railway vehicle according to claim 3 , further comprising: a reinforcing plate that connects the transition region and the lower wall portion and extends in the vertical direction.

Images