JP7296061B1 - Bus air suspension structure - Google Patents

Abstract

A bus having an in-axle motor type rear axle stably supports an air spring and expands a low-floor area of a passenger compartment floor.
A front beam (30) includes a front beam flange portion (31) fixed to an in-axle motor unit (22) and a front air spring support portion (38) extending forward from the front beam flange portion (31) and supporting a front air spring (14A). and a front beam body portion 32 integrally having at the front end thereof. The rear beam 40 includes a rear beam flange portion 41 fixed to the in-axle motor unit 22 and a rear air spring support portion 48 extending rearward from the rear beam flange portion 41 and supporting the rear air spring 14B. and a rear beam main body portion 42 at an end thereof. The front air spring support portion 38 and the front air spring 14A are arranged rearward of the vehicle relative to the cross member 12A that is closest to the front of the rear axle.
[Selection drawing] Fig. 6

Description

The present disclosure relates to air suspension structures for buses.

Patent Document 1 describes an air suspension in which both ends of a rear axle that supports rear tires are fixed to left and right support beams with U-bolts, and a pair of front and rear air springs are interposed between the support beams and a chassis frame. there is

Japanese Utility Model Laid-Open No. 4-135811

An in-axle motor type rear axle (hereinafter referred to as a rear axle) can be used as the rear axle of the bus. The in-axle motor type rear axle includes an axle central portion extending in the vehicle width direction, and left and right in-axle motor units fixed to both ends of the axle central portion in the vehicle width direction. In an in-axle motor unit, a motor is integrated with a hub and coaxially connected, and a rear wheel (rear tire) attached to the hub is rotated by the motor.

In such an in-axle motor type rear axle, the beam that supports the air spring (support beam) is fixed to the thick in-axle motor unit. is insufficient, and the air spring may not be stably supported.

In addition, in order to improve passenger boarding and alighting and mobility in the vehicle interior, buses are required to have a lower floor surface in the vehicle interior and to expand the low-floor area.

Therefore, the present disclosure provides an air suspension structure capable of stably supporting an air spring and expanding a low-floor area of a passenger compartment floor in a bus equipped with an in-axle motor type rear axle. aim.

In order to achieve the above object, the air suspension structure of the present disclosure includes an axle central portion extending in the vehicle width direction, and left and right in-axle motor units fixed to both ends of the axle central portion in the vehicle width direction. It is provided on a bus with an in-axle motor type rear axle. Air springs are arranged in front and rear of the left and right in-axle motor units, respectively, and the air springs are interposed between the body frame and the rear axle.

The air suspension structure of the first aspect of the present disclosure comprises a front beam mounting portion, a rear beam mounting portion, a front beam, and a rear beam. The front beam mounting portion is provided on the front surface of the in-axle motor unit. The rear beam mounting portion is provided on the rear surface of the in-axle motor unit. The front beam has a front beam flange that overlaps and is fixed to the front beam mounting portion from the front of the vehicle, and a front air spring support that extends forward from the front beam flange and supports the front air spring from below at the front end. and a front beam main body portion. The rear beam consists of a rear beam flange portion that overlaps and is fixed to the rear beam mounting portion from the rear of the vehicle, and a rear air spring support portion that extends rearward from the rear beam flange portion and supports the rear air spring from below. and a rear beam main body having at the rear end thereof.

The vehicle body frame has left and right side members extending in the front-rear direction on both sides in the vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the left and right side members. The plurality of cross members includes a cross member closest to the front of the rear axle that is vehicle forward of the rear axle and closest to the rear axle. The front air spring support portion and the front air spring are arranged rearward of the vehicle relative to the cross member immediately forward of the rear axle.

In the configuration of the first aspect, the front beam supporting the front air spring and the rear beam supporting the rear air spring are connected to the front beam mounting portion and the rear beam mounting portion of the in-axle motor unit. Since the beams are fixed to each other, sufficient mounting strength of the beams can be ensured, and the air springs can be stably supported.

In addition, since the front air spring support portion and the front air spring are arranged behind the vehicle from the cross member immediately forward of the rear axle, the rear side of the low-floor area of the passenger compartment floor reaches at least the cross member immediately forward of the rear axle. can be expanded.

A second aspect of the present disclosure is the air suspension structure of the first aspect, wherein the front beam flange portion is formed with a front beam lower bolt insertion hole penetrating in the vehicle longitudinal direction below the front beam body portion. be. The rear beam flange portion is formed with a rear beam lower bolt insertion hole that penetrates in the vehicle front-rear direction below the rear beam body portion. The front beam flange portion is fastened and fixed to the front beam mounting portion by a plurality of bolts including front beam lower bolts that are inserted through the front beam lower bolt insertion holes from the front of the vehicle. The rear beam flange portion is fastened and fixed to the rear beam attachment portion by a plurality of bolts including rear beam lower bolts that are inserted through the rear beam lower bolt insertion holes from the rear of the vehicle. The lower surface of the front beam body portion and the lower surface of the rear beam body portion are flat across substantially the entire vehicle front-rear direction.

In the configuration of the second aspect, the lower surface of the front beam main body and the lower surface of the rear beam main body are flat across substantially the entire vehicle front-rear direction. Work space (approach space for the tightening tool) for tightening from the front and rear of the vehicle can be secured, and the beam mounting work can be easily performed.

A third aspect of the present disclosure is the air suspension structure of the first or second aspect, wherein the front beam protrudes outward in the vehicle width direction from the front beam main body portion behind the front air spring support portion in the vehicle. , and stabilizer connecting portions to which ends of the stabilizers are connected. The stabilizer is arranged behind the front of the cross member in front of the rear axle.

In the configuration of the third aspect, the stabilizer connecting portion is provided behind the front air spring support portion of the vehicle, and the stabilizer is arranged behind the front surface of the cross member immediately in front of the rear axle. The rear side of the low-floor area can be extended to the cross member immediately in front of the rear axle without considering the stabilizer connecting portion or interference with the stabilizer.

A fourth aspect of the present disclosure is the air suspension structure of the first to third aspects, wherein the plurality of cross members includes a cross member behind the rear axle that is closest to and rearward of the vehicle than the rear axle and closest to the rear axle. The rear air spring support portion and the rear air spring are arranged in front of the vehicle with respect to the cross member immediately behind the rear axle. The rear beam integrally has a shock absorber supporting portion that projects outward in the vehicle width direction from the rear beam main body ahead of the rear air spring supporting portion and supports the shock absorber from below.

In the configuration of the fourth aspect, since the shock absorber support portion is provided in front of the vehicle relative to the rear air spring support portion, even if the cross member immediately behind the rear axle is arranged near the rear side of the rear air spring, , the shock absorber can be placed in a position where it does not interfere with the cross member immediately behind the rear axle.

According to the air suspension structure of the present disclosure, in a bus having an in-axle motor type rear axle, it is possible to stably support the air spring and expand the low floor area of the floor surface of the passenger compartment.

1 is a side view of a compact EV bus according to one embodiment of the present invention; FIG. FIG. 2 is a plan view schematically showing a low-floor area of the compact EV bus of FIG. 1; FIG. 2 is a perspective view of a schematic configuration with a part of a rear axle omitted, viewed from the vehicle width direction outer side front upper side; It is the top view which looked at the rear suspension structure of this embodiment from the upper part. FIG. 5 is a side view of the rear suspension structure of FIG. 4 as seen from the inside in the vehicle width direction; FIG. 5 is a bottom view of the rear suspension structure of FIG. 4 as viewed from below; Fig. 3 is a perspective view of the left front rear suspension structure as viewed from the vehicle width direction outer side front upper side;

An embodiment of the present invention will be described below with reference to the drawings. In the following description, the front-rear direction means the front-rear direction of the vehicle, and the left-right direction means the left-right direction when the vehicle faces forward. Also, the direction of each member is the direction when it is assembled to the vehicle.

As shown in FIGS. 1 and 2, a vehicle 1 according to the present embodiment is a low-floor, small EV bus (electric bus). A front entrance/exit 3 is provided in front of the front wheels 2 and a middle entrance/exit 5 is provided between the front wheels 2 and the rear wheels 4 on the side surface of the vehicle 1 (the left side in the illustrated example). A low floor area 8 is provided in a wide range on a passenger compartment floor 7 (floor panel forming the floor of the passenger compartment 6). The low floor area 8 is an area of the passenger compartment floor 7 that is set at substantially the same height as the lower edge of the opening of the front entrance/exit 3 and the lower edge of the opening of the middle entrance/exit 5 . A plurality of seats including a driver's seat 9 are arranged in the passenger compartment 6 (seats other than the driver's seat 9 are not shown), and a battery (not shown) and the like are arranged at the rear end of the passenger compartment 6 .

As shown in FIGS. 2 and 4, a vehicle body frame 10, which is a structure of the lower portion of the vehicle body of the vehicle 1, includes left and right side members 11 extending in the vehicle front-rear direction and extending in the vehicle width direction to connect the left and right side members 11. It is mainly composed of a plurality of cross members 12 that are connected to each other. The cabin floor 7 , the seat 9 , the battery, and the like are fixed to the vehicle body frame 10 .

The plurality of cross members 12 includes a rear axle front cross member 12A and a rear axle rear cross member 12B. The front rear-axle cross member 12A is a cross member located in front of an axle (rear axle) 20 of the rear wheel 4 and closest to the rear axle 20, and constitutes a joist in the rearmost row. The rear axle rear cross member 12B is the closest cross member to the rear of the rear axle 20 and forms a rear bumper at the rear end of the vehicle body frame 10 . The rear-axle front cross member 12A and the rear-axle rear cross member 12B protrude further outward than the left and right side members 11 in the vehicle width direction. The illustration of the cross members 12 other than the rear axle front cross member 12A and the rear axle rear cross member 12B is omitted.

The left and right front wheels 2 are covered above by front wheel arches 13A, and the left and right rear wheels 4 are covered above by rear wheel arches 13B (see FIG. 1). The front and rear wheel arches 13A, 13B are fixed to the body frame 10, and the rear wheel arch 13B is arranged between the rear axle front cross member 12A and the rear axle rear cross member 12B.

The front part of the body frame 10 is elastically supported by a front axle (not shown) via a front air spring (not shown), and the rear part of the body frame 10 is supported by rear air springs 14 (left front and rear air springs). 14A, 14B and front and rear air springs 14A, 14B on the right side), the vehicle (EV bus) 1 is configured to be kneelable.

As shown in FIGS. 3 to 7, the rear axle 20 is an in-axle motor type rear axle. and left and right in-axle motor units 22 that are placed and fixed.

In the in-axle motor unit 22, a motor case body 23 is fixed to an axle central portion 21, and a motor (not shown) mounted in the motor case body 23 is integrated with a hub 24 and coaxially connected, and attached to the hub 24. The rear wheels 4 are rotated by the motor.

The rear axle 20 does not have a shaft member that traverses the vehicle width direction of the vehicle 1 , and a recessed space 25 that is recessed downward is formed between the left and right in-axle motor units 22 . The upper surface of the intermediate portion of the axle central portion 21 between the left and right in-axle motor units 22 is located below the axis of the axle rotation shaft (the rotation shaft of the hub 24) and defines the lower portion of the recessed space 25. .

As shown in FIGS. 4 to 7, the air springs 14A and 14B are arranged before and after the left and right in-axle motor units 22, respectively. The front air spring 14A is supported by the in-axle motor unit 22 via the front beam 30, and the rear air spring 14B is supported by the in-axle motor unit 22 via the rear beam 40.

A front beam upper fixing portion 26 and a front beam lower fixing portion (front beam mounting portion) 27 which are separated vertically are provided on the front surface of the in-axle motor unit 22. A rear beam upper fixing portion 28 and a rear beam lower fixing portion (rear beam mounting portion) 29 which are separated from each other are provided. The front beam upper fixing portion 26 , the front beam lower fixing portion 27 , the rear beam upper fixing portion 28 , and the rear beam lower fixing portion 29 are formed integrally with the motor case body 23 .

The front beam 30 integrally has a front beam flange portion 31 , a front beam body portion 32 , and a front beam component mounting portion 33 . The front beam flange portion 31 overlaps the front beam upper fixing portion 26 and the front beam lower fixing portion 27 of the motor case body 23 from the front. Two left and right front beam upper bolt insertion holes 34 and two left and right front beam lower bolt insertion holes 35 are formed through the upper and lower ends of the front beam flange portion 31, respectively. (The front beam upper bolt insertion hole 34 and the front beam lower bolt insertion hole 35 on the inner side in the vehicle width direction are illustrated in FIG. 5, and the outer side in the vehicle width direction is omitted.).

The front beam flange portion 31 is secured to the motor case body 23 by front beam upper bolts 36 that pass through the front beam upper bolt insertion holes 34 from the front and front beam lower bolts 37 that pass through the front beam lower bolt insertion holes 35 from the front. The front beam upper fixing portion 26 and the front beam lower fixing portion 27 are fastened and fixed. In such fastening, the front beam upper fixing portion 26 and the front beam lower fixing portion 27 may be formed with female threaded bolt holes to be screwed into the front beam upper bolt 36 and the front beam lower bolt 37. Bolt insertion holes through which the front beam upper bolt 36 and the front beam lower bolt 37 are inserted are formed in the portion 26 and the front beam lower fixing portion 27, and nuts are screwed onto the front beam upper bolt 36 and the front beam lower bolt 37. good.

The front beam main body portion 32 is the lower end portion of the front beam flange portion 31 and extends forward from above the front beam lower bolt insertion hole 35 . A plate-like front air spring support portion 38 is formed at the front end of the front beam main body portion 32 to support the front air spring 14A from below. The front air spring support portion 38 and the front air spring 14A are arranged behind the rear axle front cross member 12A.

The front beam component mounting portion 33 has a flat plate shape and projects outward in the vehicle width direction from the front beam main body portion 32 behind the front air spring support portion 38 . A front beam component mounting hole 39 is formed through the front beam component mounting portion 33 in the vertical direction.

The rear beam 40 integrally has a rear beam flange portion 41 , a rear beam body portion 42 , and a rear beam component mounting portion 43 . The rear beam flange portion 41 overlaps the rear beam upper fixing portion 28 and the rear beam lower fixing portion 29 of the motor case body 23 from behind. Two left and right rear beam upper bolt insertion holes 44 and two left and right rear beam lower bolt insertion holes 45 are formed through the upper and lower ends of the rear beam flange portion 41, respectively. (The rear beam upper bolt insertion hole 44 and the rear beam lower bolt insertion hole 45 on the inner side in the vehicle width direction are illustrated in FIG. 5, and the illustration of the outer side in the vehicle width direction is omitted.).

The rear beam flange portion 41 is secured to the motor case body 23 by a rear beam upper bolt 46 that is inserted through the rear beam upper bolt insertion hole 44 from behind and a rear beam lower bolt 47 that is inserted through the rear beam lower bolt insertion hole 45 from the rear. are fastened and fixed to the rear beam upper fixing portion 28 and the rear beam lower fixing portion 29 of the . In such fastening, the rear beam upper fixing portion 28 and the rear beam lower fixing portion 29 may be formed with female threaded bolt holes to be screwed with the rear beam upper bolt 46 and the rear beam lower bolt 47. Bolt insertion holes through which the rear beam upper bolt 46 and the rear beam lower bolt 47 are inserted are formed in the portion 28 and the rear beam lower fixing portion 29, and nuts are screwed onto the rear beam upper bolt 46 and the rear beam lower bolt 47. good.

The rear beam main body portion 42 extends rearward from above the rear beam lower bolt insertion hole 45 at the lower end portion of the rear beam flange portion 41 . A plate-shaped rear air spring support portion 48 is formed at the rear end of the rear beam body portion 42 to support the rear air spring 14B from below. The rear air spring support portion 48 and the rear air spring 14B are arranged forward of the rear axle rear cross member 12B.

The rear beam component mounting portion 43 has a flat plate shape and projects outward from the rear beam main body portion 42 in the vehicle width direction forward of the rear air spring support portion 48 . A rear beam component mounting hole 49 penetrating vertically is formed in the rear beam component mounting portion 43 .

The front beam flange portion 31 and the front beam main body portion 32 and the rear beam flange portion 41 and the rear beam main body portion 42 are connected and reinforced by reinforcing ribs 52, respectively (see FIG. 5). Reinforcing ribs 53 (the reinforcing ribs of the rear beam 40 are (not shown) are connected and reinforced (see FIG. 7).

The lower surface of the front beam main body portion 32 and the lower surface of the rear beam main body portion 42 do not have a curved surface shape that bulges downward, but have a flat surface shape over substantially the entire area in the front-rear direction. The longitudinal length of the front beam 30 (the longitudinal length of the front beam body portion 32) is shorter than the vertical height of the beam 30 (the vertical length of the front beam flange portion 31). The longitudinal length of the side beam 40 (the longitudinal length of the rear beam body portion 42) is shorter than the vertical height of the beam 40 (the vertical length of the rear beam flange portion 41). Since the lengths of the front beam main body portion 32 and the rear beam main body portion 42 in the front-rear direction are short, the front beam main body portion 32 and the rear beam main body portion 42 do not protrude downward from the lower surfaces of the front beam main body portion 32 and the rear beam main body portion 42 . Rigidity of the beam body portion 42 can be ensured.

Left and right ends of stabilizers 60 interposed between the rear axle 20 and the vehicle body frame 10 to suppress rolling of the vehicle 1 are connected to the front beam component mounting portions 33 of the left and right front beams 30 (see FIG. 6). That is, the front beam component mounting portion 33 constitutes the stabilizer connecting portion 50 to which the end portion of the stabilizer 60 is connected. A stabilizer link 62 is attached to the stabilizer connecting portion 50 via a bush (not shown). The stabilizer 60 has a torsion bar 63 extending in the vehicle width direction and a pair of left and right arms 64 extending rearward by bending from both ends of the torsion bar 63 . (see FIG. 6). The stabilizer 60 is arranged behind the front surface of the rear axle front cross member 12A.

The lower ends of shock absorbers 65 that are interposed between the rear axle 20 and the vehicle body frame 10 to attenuate vibration are attached to the rear beam component attachment portions 43 of the left and right rear beams 40 . That is, the rear beam component mounting portion 43 constitutes a shock absorber support portion 51 that supports the shock absorber 65 from below.

In this embodiment, the left front beam 30 and the right rear beam 40 have the same shape, and the right front beam 30 and the left rear beam 40 have the same shape. Therefore, the number of beam types required can be halved.

As described above, according to this embodiment, the front beam 30 that supports the front air spring 14A and the rear beam 40 that supports the rear air spring 14B are connected to each other by the in-axle motor unit 22. Since the beams 30 and 40 are fixed to the motor case body 23 respectively, sufficient mounting strength can be secured for the beams 30 and 40, and the air springs 14A and 14B can be stably supported.

Since the front air spring support portion 38 and the front air spring 14A are arranged behind the rear axle front cross member 12A, the rear side of the low floor area 8 (see FIG. 1) of the passenger compartment floor 7 is placed on the rear axle front cross member. It can be extended to member 12A.

Since the lower surface of the front beam main body portion 32 and the lower surface of the rear beam main body portion 42 are flat across substantially the entire vehicle front-rear direction, the front beam lower bolt 37 and the rear beam lower bolt 47 can be installed from the front and rear. A work space (approach space for a tightening tool) for tightening can be secured, and the mounting work of the beams 30 and 40 can be easily performed.

The stabilizer connecting portion 50 is provided behind the front air spring support portion 38, and the stabilizer 60 is arranged behind the front surface of the rear axle front cross member 12A. can be expanded to the rear axle front cross member 12A without considering interference with the stabilizer connecting portion 50 and the stabilizer 60.

Further, since the shock absorber support portion 51 is provided in front of the rear air spring support portion 48, even when the rear axle rear cross member 12B is arranged in the vicinity of the rear side of the rear air spring 14B, the rear axle rear cross member is The shock absorber 65 can be arranged at a position that does not interfere with 12B.

Although the present invention has been described above based on the above embodiments, the present invention is not limited to the contents of the above embodiments, and can be appropriately modified without departing from the scope of the present invention. In other words, all other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention.

For example, in the above embodiment, the left front beam 30 and the right rear beam 40 have the same shape, and the right front beam 30 and the left rear beam 40 have the same shape. Although explained, the shape of each beam 30, 40 is not limited to this, and can be set arbitrarily.

In the above embodiment, the vehicle 1 is a small bus, and the rear side of the low floor area 8 of the passenger compartment floor 7 is expanded to the rear axle front cross member 12A. Alternatively, the rear side of the low floor area 8 of the passenger compartment floor 7 may be expanded rearward beyond the rear axle front cross member 12A.

INDUSTRIAL APPLICABILITY The present invention can be widely applied to buses having an in-axle motor type rear axle.

1: Vehicle (EV bus)
2: Front wheel 3: Front entrance/exit 4: Rear wheel 5: Middle entrance/exit 6: Cabin 7: Cabin floor 8: Low floor area 9: Driver's seat 10: Body frame 11: Side member 12: Cross member 12A: Rear axle front cross member 12B: Rear axle rear cross member 13A, 13B: Wheel arch 14A: Front side air spring 14B: Rear side air spring 20: Rear axle 21: Axle central part 22: In-axle motor unit 23: Motor case body 24: Hub 25: Concave space 26: Front beam upper fixing part 27: Front beam lower fixing part (front beam mounting part)
28: Rear beam upper fixing part 29: Rear beam lower fixing part (rear beam mounting part)
30: front beam 31: front beam flange portion 32: front beam main body portion 33: front beam component mounting portion 34: front beam upper bolt insertion hole 35: front beam lower bolt insertion hole 36: front beam upper bolt 37: front beam Lower bolt 38: Front air spring support portion 39: Front beam component mounting hole 40: Rear beam 41: Rear beam flange portion 42: Rear beam body portion 43: Rear beam component mounting portion 44: Rear beam upper bolt insertion hole 45 : Rear beam lower bolt insertion hole 46: Rear beam upper bolt 47: Rear beam lower bolt 48: Rear air spring support portion 49: Rear beam component mounting hole 50: Stabilizer connection portion 51: Shock absorber support portion 52, 53: Reinforcement rib 60: Stabilizer 62: Stabilizer link 63: Torsion bar 64: Arm 65: Shock absorber

Claims (4)

provided in a bus equipped with an in-axle motor type rear axle composed of an axle central portion extending in the vehicle width direction and left and right in-axle motor units fixed to both ends of the axle central portion in the vehicle width direction, An air suspension structure in which air springs arranged in front and rear of left and right in-axle motor units are interposed between a vehicle body frame and the rear axle,
a front beam mounting portion provided on the front surface of the in-axle motor unit;
a rear beam mounting portion provided on the rear surface of the in-axle motor unit;
It has a front beam flange portion that overlaps and is fixed to the front beam mounting portion from the front of the vehicle, and a front air spring support portion that extends forward of the vehicle from the front beam flange portion and supports the air spring on the front side from below at the front end. a front beam integrally having a front beam main body;
A rear beam flange that overlaps and is fixed to the rear beam mounting portion from the rear of the vehicle, and a rear air spring support that extends rearward of the vehicle from the rear beam flange and supports the rear air spring from below at the rear end. a rear beam body integrally having a rear beam main body having a
The vehicle body frame has left and right side members extending in the front-rear direction on both sides in the vehicle width direction, and a plurality of cross members extending in the vehicle width direction and connecting the left and right side members,
the plurality of cross members include a cross member that is in front of the vehicle and closest to the rear axle and closest to the front of the rear axle;
An air suspension structure for a bus, wherein the front air spring supporting portion and the front air spring are arranged behind a cross member in front of the rear axle and closer to the rear of the vehicle. The air suspension structure according to claim 1,
The front beam flange portion is formed with a front beam lower bolt insertion hole penetrating in the vehicle front-rear direction below the front beam main body portion,
The rear beam flange portion is formed with a rear beam lower bolt insertion hole penetrating in the vehicle front-rear direction below the rear beam main body portion,
The front beam flange portion is fastened and fixed to the front beam mounting portion by a plurality of bolts including front beam lower bolts that pass through the front beam lower bolt insertion holes from the front of the vehicle,
The rear beam flange portion is fastened and fixed to the rear beam mounting portion by a plurality of bolts including rear beam lower bolts that are inserted through the rear beam lower bolt insertion holes from the rear of the vehicle,
An air suspension structure for a bus, wherein a lower surface of the front beam main body and a lower surface of the rear beam main body are flat across substantially the entire vehicle front-rear direction. The air suspension structure according to claim 1 or claim 2,
The front beam integrally has a stabilizer connection portion projecting outward in the vehicle width direction from the front beam main body portion behind the front air spring support portion and to which an end portion of a stabilizer is connected,
An air suspension structure for a bus, wherein the stabilizer is arranged behind the front surface of the cross member in front of the rear axle. The air suspension structure according to any one of claims 1 to 3,
the plurality of cross members include a cross member behind the rear axle and closest to the rear axle and at the rear of the vehicle;
The rear air spring support portion and the rear air spring are arranged in front of the vehicle with respect to the cross member immediately rearward of the rear axle, and
The rear beam integrally has a shock absorber support portion that projects outward in the vehicle width direction from the rear beam body portion in front of the vehicle relative to the rear air spring support portion and supports the shock absorber from below. and the air suspension structure of the bus.

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