JP4222954B2 - Tread variable axle and car transport trailer - Google Patents

Description

  The present invention relates to a tread variable axle of an automobile transport trailer.

  2. Description of the Related Art Conventionally, a tread variable axle that can widen a tread between left and right wheels is known as an axle of an automobile transport trailer (see, for example, Patent Document 1). The tread variable axle includes a cylindrical outer axle, and a pair of inner axles that rotatably support the wheel and slidably fit in the outer axle. .

  A swing member that constitutes a part of the suspension device is attached to the lower or upper portion of the outer axle, and the outer axle is suspended from the vehicle body via spring elements such as the swing member, air bellows, and leaf spring. .

  A brake, a cam rod, a brake chamber, and the like for braking the rotation of the wheel are attached to the inner axle. The cam rod is disposed substantially parallel to the vehicle width direction of the vehicle body, and is connected to the brake via the cam by rotating around its central axis. The brake chamber is mounted on the inner axle so that the push rod moves forward and backward in the forward / backward direction or in a direction slightly tilted upward / downward from the forward / backward direction to drive the cam rod. The chamber body projects rearward from the tread variable axle. ing.

  When loading and unloading in an automobile transport trailer equipped with such a tread variable axle, first jack up the vehicle body with a jackup device such as an outrigger, and then separate the wheels of the tread variable axle from the ground. The inner axle is slid outward in the vehicle width direction of the vehicle body to widen the tread between the left and right wheels from the traveling tread to the unloading tread.

  The automobile self-propels a road plate installed in a slope shape at the rear end of the vehicle body, and is loaded onto the vehicle body through the widened wheels of the tread and unloaded from the vehicle body. By widening the tread, it is possible to easily load and unload vehicles with a wide vehicle width. After completion of the work, return the wheel tread to the traveling tread and then release the jack-up to ground the wheel. When loading or unloading, after loading the tread of the wheel and widening it to the unloading tread, the jack-up height of the vehicle body is slightly lowered, the wheel approaches the ground, or excessively on the inner axle You may make it ground to the extent that a load does not act. By lowering the vehicle body in this way, the workability of loading and unloading is improved accordingly.

  In recent years, there has been a demand for further lowering the floor of a vehicle body for an automobile transport trailer. For example, in recent years, an increasing number of vehicles have a low ground clearance at the front lower end of a vehicle equipped with a front spoiler or the like. In such vehicles, front spoilers and the like are likely to interfere with the road plate when getting into the vehicle body, but if the vehicle body is lowered, the inclination angle of the road plate can be reduced accordingly, and interference with the road plate is avoided. can do. Although it is possible to reduce the inclination angle of the road plate by extending the length of the road plate, it is not practically preferable because a wide space is required behind the vehicle body.

JP 2002-120638 A

  However, when the vehicle body of an automobile transport trailer having a tread variable axle is lowered, the swinging member that suspends the outer axle and the outer axle together with the vehicle body approaches the ground so much, so there is a problem that a sufficient ground clearance cannot be secured. is there. Peripheral devices such as a brake chamber protruding in the front-rear direction are attached to the tread variable axle, but when the vehicle body is lowered, the ground clearance of these peripheral devices also decreases, and the ground, obstacles on the ground, etc. There is a problem that peripheral devices are likely to be damaged due to contact with the device.

  On the other hand, if the tread variable axle can be made compact in the vertical direction, the vehicle body can be lowered while securing the ground clearance of peripheral devices such as swing members and brake chambers as in the conventional case. The variable axle has the function of supporting the vehicle body along with the function of accommodating the inner axle by the outer axle of the cylindrical body, and reducing the tread variable axle in the vertical direction while maintaining the function of these outer axles. It was difficult. That is, when the tread variable axle is made compact in the vertical direction, there is a problem that a sufficient space for accommodating the inner axle cannot be secured, and sufficient bending rigidity and strength of the outer axle cannot be secured.

  The present invention has been made in view of the above problems, and a tread variable axle capable of reducing the floor of a vehicle body while ensuring a ground clearance equivalent to that of a conventional vehicle, and an automobile including the tread variable axle An object is to provide a transport trailer.

  The present invention comprises a pair of axle units that have a symmetrical structure in the vehicle width direction of the vehicle body and are suspended independently from the vehicle body, and these axle units are suspended in a swingable manner from the vehicle body. A base portion, a slide portion that rotatably supports a wheel, and is detachably mounted on an outer portion of the base portion in the vehicle width direction so as to be slidable in the vehicle width direction; the slide portion and the base A tread variable axle comprising a cylinder connected to one of the parts and a rod connected to the other, and an actuator disposed substantially parallel to the vehicle width direction. This solves the above problem.

  The disc brake for braking the rotation of the wheel, and a brake chamber having a substantially cylindrical chamber body and a push rod, the push rod being arranged substantially parallel to the vehicle width direction, are slid. It is good to prepare for the part.

  The brake chamber and the actuator may be arranged side by side in the front-rear direction of the vehicle body so that the vertical position of the vehicle body is at least partially equal.

  Further, a pair of the actuators may be provided in each axle unit so as to be separated from each other in the longitudinal direction of the vehicle body, and the brake chamber may be disposed between these actuators.

  The brake chamber may be disposed below a central axis passing through the centers of the wheels on both sides in the vehicle width direction.

  Moreover, it is good for the said base part to be provided with the box-shaped part for accommodating the said brake chamber inside in the state in which the said slide part was mounted | worn.

  Moreover, this invention solves the said subject by the trailer for motor vehicle conveyance provided with the tread variable axle in any one of said.

  According to the present invention, in the conventional tread variable axle, the base portion functions as an outer axle that supports the vehicle body and a swing member that suspends the tread variable axle, so the base portion is compact in the vertical direction. It is. In addition, since the slide portion that supports the wheel is mounted on the outer portion of the base portion, the base portion is more compact in the vertical direction than the conventional outer axle that accommodates the inner axle inside. Therefore, a sufficient ground clearance can be secured even if the vehicle body is lowered.

  Further, by adopting a disc brake, the brake chamber can be arranged so that its push rod is substantially parallel to the vehicle width direction. Thereby, the protrusion amount of the brake chamber in the front-rear direction from the tread variable axle can be suppressed, and the effect of protecting the brake chamber from the ground or the like can be obtained. Further, the brake chamber and the actuator can be arranged side by side in the front-rear direction of the vehicle body so that the vertical position is at least partially equal, thereby making the tread variable axle compact in the vertical direction. Is obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 5, the vehicle transport trailer 10 according to the embodiment of the present invention includes a tread variable axle 14 in the vicinity of the rear end of the vehicle body 12, and the structure of the tread variable axle 14 is the same. Has characteristics. Since other structures are the same as those of the conventional automobile transport trailer, the description thereof will be omitted as appropriate.

  The vehicle body 12 has a structure in which a lower frame is divided into a front frame 16 on the front side of the tread variable axle 14 and a rear frame 18 on the rear side of the tread variable axle 14. Note that the front frame 16 and the rear frame 18 are coupled upward by a side frame (not shown) of the vehicle body 12. The vehicle body 12 is provided with a jack-up device (not shown) for separating the wheels 20 attached to the tread variable axle 14 such as an outrigger from the ground.

  The tread variable axle 14 has a symmetrical structure in the vehicle width direction of the vehicle body 12 and includes a pair of axle units of a right axle unit 22 and a left axle unit 24 that are suspended independently from the vehicle body 12. Since the right axle unit 22 and the left axle unit 24 have the same structure except that they are symmetrical in the vehicle width direction as described above, the structure of the right axle unit 22 will be described here, and the structure of the left axle unit 24 will be described. The same reference numerals as those of the right axle unit 22 are attached to the components and the description thereof is omitted.

  The right axle unit 22 rotatably supports a base portion 25 and a wheel 20 that are swingably suspended on the vehicle body 12, and is detachably attached to an outer portion of the base portion 25 in the vehicle width direction. The same as the front actuator 28 having a slide portion 26 that is slidable, a cylinder 28A that is connected to the base portion 25, and a rod 28B that is connected to the slide portion 26 and arranged substantially parallel to the vehicle width direction. The cylinder 30A is connected to the base portion 25 and the rod 30B is connected to the slide portion 26, and the rear actuator 30 is arranged substantially parallel to the vehicle width direction.

  Specifically, the front actuator 28 and the rear actuator 30 are hydraulic cylinders, and are arranged substantially parallel to each other in the longitudinal direction of the vehicle body 12.

  The slide portion 26 includes a disc brake 32 for braking the rotation of the wheel 20, a substantially cylindrical chamber main body 34A, and a push rod 34B. The push rod 34B is disposed substantially parallel to the vehicle width direction. And a brake chamber 34.

  The base portion 25 includes a box-shaped portion 36 for accommodating the brake chamber 34 inside with the slide portion 26 mounted, and a shaft in the vehicle width direction is disposed on the front bracket 38 near the front end of the box-shaped portion 36. The front bracket 38 is fixed to a cross bar 16 </ b> A constituting the rear end edge of the front frame 16. On the outer side in the vehicle width direction of the box-shaped portion 36, two fitting holes 36A and 36B for mounting the slide portion 26 are formed apart from each other in the front-rear direction. A plate-like portion 40 is attached to the lower portion of the rear end of the box-like portion 36 so as to protrude rearward, and an air bellows 42 is attached to the upper surface of the plate-like portion 40. A substantially plate-shaped rear bracket 44 is attached to the upper end of the air bellows 42, and the rear bracket 44 is fixed to a cross bar 18 </ b> A that constitutes the front end edge of the rear frame 18. A shock absorber 46 is mounted between the plate-like portion 40 and the rear bracket 44.

  As shown in FIGS. 6 to 8, the slide portion 26 has a substantially U-shaped frame 48 when viewed from the side in the vehicle width direction. The frame 48 has a structure in which a front end edge 48B and a rear end edge 48C protrude downward from both ends of an upper end edge 48A along the front-rear direction, and the hub 50 rotates near the center of the upper end edge 48A and outside in the vehicle width direction. The rotor 50 and the wheel 20 of the disc brake 32 are attached to the hub 50.

  The front edge 48B has a shape that slightly protrudes inward in the vehicle width direction from the upper edge 48A and is bent downward. A cylindrical protrusion 48D that protrudes inward in the vehicle width is formed at the lower end of the front edge 48B. Is formed. The rear end edge 48C has the same shape as the front end edge 48B, and a cylindrical protrusion 48E is formed at the lower end thereof.

  The tip of the rod 28B of the front actuator 28 is connected to the protrusion 48D of the front edge 48B, and the tip of the rod 30B of the rear actuator 30 is connected to the protrusion 48E of the rear edge 48C.

  The slide portion 26 is fitted into the base portion 25 by fitting into the fitting holes 36A and 36B of the box-like portion 36 of the base portion 25 at the protrusion 48D of the front end edge 48B and the protrusion 48E of the rear end edge 48C of the frame 48. It is mounted and supported by the rod 28B of the front actuator 28 and the rod 30B of the rear actuator 30 while being slid outward from the base portion 25 in the vehicle width direction.

  Further, a caliper 54 is disposed in a portion surrounded by the upper end edge 48A, the front end edge 48B, and the rear end edge 48C so as to sandwich the rotor 52 from both sides in the vehicle width direction, and the caliper 54 is attached to the frame 48 via guide pins (not shown). Is slidably mounted in the vehicle width direction.

  An outer pad 56 is disposed outside the rotor 52 in the vehicle width direction, and the outer pad 56 is fixed to the caliper 54. On the other hand, an inner pad 58 is disposed inside the rotor 52 in the vehicle width direction, and the inner pad 58 is held in the caliper 54 so as to be movable in the vehicle width direction. Further, a sleeve 60 and a lever 62 are disposed on the inner side of the inner pad 58 in the vehicle width direction. The lever 62 is pivotally supported by the caliper 54 in the vicinity of the base end, and a contact portion with the sleeve 60 in the vicinity of the pivot portion constitutes a cam.

  The brake chamber 34 is disposed below the central axis passing through the centers of the wheels 20 on both sides in the vehicle width direction, and is attached to the caliper 54 in the chamber body 34B so that the tip of the push rod 34B abuts the tip of the lever 62. . The push rod 34 </ b> B protrudes in the direction of the lever 62 so that the lever 62 rotates and presses the inner pad 58 against the rotor 52 via the sleeve 60.

  The brake chamber 34 is disposed between the front actuator 28 and the rear actuator 30. The brake chamber 34, the front actuator 28, and the rear actuator 30 are arranged side by side in the front-rear direction so that the positions in the vertical direction are partially equal.

  The front actuator 28 is attached to the box-shaped portion 36 in the cylinder 28 </ b> A, and the rod 28 </ b> B is inserted through the fitting hole 36 </ b> A of the box-shaped portion 36 of the base portion 25. More specifically, approximately half of the cylinder 28A is accommodated in the box-shaped portion 36 of the base portion 25, and the other approximately half projects from the box-shaped portion 36 inward in the vehicle width direction. Further, a lock shaft (not shown) for engaging the rod 28B and fixing the rod 28B in the retracted position is built in the vicinity of the tip of the cylinder 28A, and a rotary actuator 63 for rotating the lock shaft is provided. It is attached to the tip of the cylinder 28A.

  Similarly, the rear actuator 30 is attached to the box-shaped portion 36 of the base portion 25 in the cylinder 30A, and approximately half of the cylinder 30A is accommodated in the box-shaped portion 36 of the base portion 25, and the other approximately half is A lock shaft (not shown) for projecting inward in the vehicle width direction from the box-shaped portion 36 and engaging the rod 30B and fixing the rod 30B in the retracted position is built in the vicinity of the tip of the cylinder 30A. The lock shaft is engaged with the rotary actuator 63 of the front actuator 28 via the link 64, and the rod 28B of the front actuator 28 and the rod 30B of the rear actuator 30 are interlocked and fixed at the retracted position. It is configured to be. The rod 30 </ b> B is inserted through the fitting hole 36 </ b> B of the box-shaped portion 36 of the base portion 25.

  Next, the operation of the automobile transport trailer 10 will be described.

  As shown in FIG. 3, the vehicle transport trailer 10 normally has the front actuator 28 and the rear actuator 30 fixed at the retracted position, the slide portion 26 is mounted on the base portion 25, and the wheels 20 of the tread variable axle 14. Is fixed to the running tread.

  When the automobile is mounted on the automobile transport trailer 10, first, the vehicle body 12 is jacked up by a jackup device such as an outrigger, and the wheels 20 of the tread variable axle 14 are separated from the ground.

  In this state, the rotary actuator 63 is driven to release the rod 28B of the front actuator 28 and the rod 30B of the rear actuator 30 fixed at the retracted position, and then the front actuator 28, rear side as shown in FIG. The slide portion 24 is slid outward in the vehicle width direction by the actuator 30 and widened to the tread for loading and unloading.

  Next, after the vehicle body 12 is slightly lowered by the jack-up device to bring the wheel 20 close to the ground, the front end of a road plate (not shown) is locked to the rear end of the vehicle body 12. Since the rear end of the vehicle body 12 is lowered, the inclination angle of the road plate can be reduced.

  Normally, the vehicle is mounted in this state. The automobile travels on the road plate and passes between the wheels 20 widened to the mounting tread and gets on the vehicle body 12 to be mounted. Even a wide automobile can get on the vehicle body 12 without interfering with the wheels 20.

  When a vehicle with a particularly low ground clearance such as an air spoiler-equipped vehicle is mounted, the air bellows 42 is opened to the atmosphere, and the vehicle body 12 is further lowered slightly by a jack-up device to ground the wheel 20. Since the air in the air bellows 42 is exhausted, the vehicle body 12 descends while contracting the air bellows 42 without receiving a reaction force due to the action of the air spring of the air bellows 42. Before the air bellows 42 completely contracts, the lowering of the vehicle body 12 is stopped so that an excessive load does not act on the base portion 25, the slide portion 26, etc., and the vehicle body 12 is held at this height by the jack-up device. . As a result, the inclination angle of the road plate is reduced, and an automobile having a lower front lower end of the vehicle gets into the road plate and is mounted on the vehicle body 12 without interfering with the road plate.

  When all the automobiles are mounted on the vehicle body 12, the vehicle body 12 is jacked up and the front actuator 28 and the rear actuator 30 slide the slide portion 26 inward in the vehicle width direction to load and unload the wheels 20 and tread. Return to the running tread. The slide portion 26 is fitted into the base portion 25 by fitting into the fitting holes 36A and 36B of the box-like portion 36 of the base portion 25 at the protrusion 48D of the front end edge 48B and the protrusion 48E of the rear end edge 48C of the frame 48. Installed. In this state, the rotary actuator 63 is driven to fix the rod 28B of the front actuator 28 and the rod 30B of the rear actuator 30 at the retracted positions. Thereby, the slide part 26 is fixed to the base part 25. Further, when the air bellows 42 is open to the atmosphere, air is supplied into the air bellows 42.

  Here, the jack-up is canceled and the wheel 20 is grounded. Thereby, the loading operation of the automobile is completed, and the automobile transport trailer 10 can travel. The unloading operation of the automobile may be performed by loading the wheels 20 in the same procedure as the loading operation and widening the wheels 20 to the unloading tread.

  Thus, since the automobile transport trailer 10 includes the tread variable axle 14, even a wide automobile can be easily mounted on the vehicle body 12.

  Further, the tread variable axle 14 is compact in the vertical direction because the base portion 25 has both the function of the outer axle for supporting the vehicle body and the function of the swinging member for suspending the tread variable axle in the conventional tread variable axle. It is. Moreover, since the slide part 26 which supports the wheel 20 is attached to the outer part of the base part 25, the base part 25 is also in this respect than the outer axle which accommodates the inner axle in the conventional tread variable axle. Compact in the vertical direction.

  Further, since the tread variable axle 14 employs the disc brake 32, the brake chamber 34 can be disposed such that the push rod 34B is substantially parallel to the vehicle width direction. As a result, the brake chamber 34, the front actuator 28, and the rear actuator 30 can be arranged in the front-rear direction so that the positions in the up-down direction are equal in part. It is compact.

  Accordingly, as shown in FIGS. 9 (A) and 10 (A), the vehicle transport trailer 10 includes a conventional tread variable axle shown in comparison with FIGS. 9 (B) and 10 (B). The vehicle body 12 has a lower floor while ensuring a sufficient ground clearance equivalent to that of the conventional vehicle transport trailer. Therefore, it is possible to travel in the same manner as in the prior art, and it is easy to load and unload, and it is easy to mount an automobile with a low ground clearance.

  Further, since the brake chamber 34 is disposed substantially parallel to the vehicle width direction of the tread variable axle 14, the front and rear protrusion of the brake chamber 34 is suppressed, and the effect of protecting the brake chamber 34 from the ground or the like accordingly. Is expensive. Further, since the brake chamber 34 is disposed below the central axis passing through the centers of the wheels 20 on both sides in the vehicle width direction, the effect of protecting the brake chamber 34 from the ground or the like is further enhanced. Furthermore, since the brake chamber 34 is disposed between the front actuator 28 and the rear actuator 30, the effect of protecting the brake chamber 34 from the ground or the like is enhanced in this respect as well. Furthermore, since the brake chamber 34 is normally accommodated in the box-shaped portion 36 of the base portion 25, the effect of protecting the brake chamber 34 from the ground or the like is further enhanced.

  Further, since the variable tread axle 14 is divided into a right axle unit 22 and a left axle unit 24, each axle unit is compact and the unsprung weight of each axle unit is suppressed, and the vehicle travels as much. Good performance.

  In the present embodiment, the brake chamber 34 is normally accommodated in the box-shaped portion 36 of the base portion 25. However, the present invention is not limited to this. For example, the brake chamber 34 is made of a plate material or the like. You may shield and protect from the ground.

  In the present embodiment, the brake chamber 34 is disposed below the central axis passing through the centers of the wheels 20 on both sides in the vehicle width direction. However, the present invention is not limited to this, and the central axis of the wheels 20 is not limited thereto. Even if the brake chamber 34 is arranged slightly shifted in the front-rear direction from below, the effect of downsizing the variable tread axle 14 in the vertical direction can be obtained. In this case as well, in order to enhance the effect of protecting the brake chamber 34 from the ground, it is preferable to suppress the protrusion amount of the brake chamber 34 in the front-rear direction from the tread variable axle 14 as much as possible.

  In the present embodiment, the brake chamber 34 is disposed between the front actuator 28 and the rear actuator 30, but the present invention is not limited to this, and the front side or the rear side of the front actuator 28. A brake chamber 34 may be disposed on the rear side of the side actuator 30. Also in this case, in order to make the tread variable axle 14 compact in the vertical direction, the brake chamber 34, the front actuator 28, and the rear actuator 30 are arranged in the front-rear direction so that the positions in the vertical direction are at least partially equal. It is preferable to arrange.

  In the present embodiment, the right axle unit 22 and the left axle unit 24 are configured to slide the slide portion 26 in the vehicle width direction by a pair of actuators of the front actuator 28 and the rear actuator 30. However, the present invention is not limited to this, and a guide for guiding the slide portion 26 in the vehicle width direction may be provided, and the slide portion 26 may be slid in the vehicle width direction with one actuator.

  In the present embodiment, the front actuator 28 and the rear actuator 30 are hydraulic cylinders. However, the present invention is not limited to this, and other types of actuators such as pneumatic cylinders may be used. Good.

  In the present embodiment, the right axle unit 22 and the left axle unit 24 are suspended from the vehicle body 12 by an air suspension provided with an air bellows 42. However, the present invention is not limited to this, and is a diaphragm type. The suspension may be suspended on the vehicle body 12 by an air suspension, or may be suspended on the vehicle body 12 by a mechanical suspension such as a leaf spring or a coil spring.

  In the present embodiment, the front actuator 28 has a rotary actuator 63 for rotationally driving the lock shaft of the cylinder 28A attached to the tip of the cylinder 28A. However, the present invention is not limited to this. For example, as shown in FIG. 11, the lock shaft may be rotationally driven by using a linear motion actuator 66 that can expand and contract in the front-rear direction of the vehicle body 12 instead of the rotation actuator 63. A lever (not shown) is attached to the tip of the lock shaft. One end of the linear actuator 66 is pivotally supported by this lever, and the other end is pivotally supported by a bracket 68 attached to the rear actuator 30. .

  The present invention can be used for an automobile transport trailer.

The perspective view which shows schematic structure of the periphery of the tread variable axle of the vehicle transport trailer which concerns on embodiment of this invention. Plan view showing the tread variable axle with the tread width expanded The top view which expands and shows the right axle unit of the tread variable axle with which the tread width was narrowed Side view of the right axle unit viewed from the right Side view of the right axle unit viewed from the left Sectional drawing which expands and shows the structure of the slide part of the tread variable axle Side view showing arrow VII in FIG. Sectional drawing which follows the VIII-VIII line in FIG. Rear view showing the car transport trailer and a conventional car transport trailer with a variable tread axle. Plan view The top view which shows the other structural example of the tread variable axle of the vehicle transport trailer which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Trailer for motor vehicle 12 ... Vehicle body 14 ... Tread variable axle 20 ... Wheel 22 ... Right axle unit 24 ... Left axle unit 25 ... Base part 26 ... Slide part 28 ... Front side actuator 28A, 30A ... Cylinder 28B, 30B ... Rod 30 ... rear actuator 32 ... disc brake 34 ... brake chamber 34A ... chamber body 34B ... push rod 36 ... box-like part 42 ... air bellows

Claims (6)

The vehicle body (12) has a symmetric structure in the vehicle width direction, and includes a pair of axle units (22, 24) suspended independently from the vehicle body (12). Each of these axle units (22 , 24) is provided. Is a base part (25) swingably suspended from the vehicle body (12) and a wheel (20) rotatably supported, and is detachably attached to an outer part of the base part (25) in the vehicle width direction. A slide part (26) mounted on the vehicle body and slidable in the vehicle width direction, a cylinder (28A, 30A) connected to one of the slide part (26) and the base part (25) , and the other rods (28B, 30B) becomes a, and actuator (28, 30) which are arranged substantially parallel to the vehicle width direction, Ri comprising at configuration der and the rotation of the wheel (20) Disc brake for braking ( 2), and a brake chamber (34) having a substantially cylindrical chamber body (34A) and a push rod (34B), wherein the push rod (34B) is arranged substantially parallel to the vehicle width direction. A tread variable axle (14) characterized in that the tread variable axle (14) is provided in the slide portion (26 ) . In claim 1 ,
The brake chamber (34) and the actuators (28, 30) are arranged side by side in the front-rear direction of the vehicle body (12) so that the vertical position of the vehicle body (12) is at least partially equal. Tread variable axle (14) characterized in that. In claim 2 ,
The provided pair spaced in the longitudinal direction of the actuator (28, 30) is the body on each axle unit (22, 24) (12), said brake chamber between actuators (28, 30) (34) A tread variable axle (14) , characterized in that In any one of Claims 1 thru | or 3 ,
The tread variable axle (14), wherein the brake chamber (34) is disposed below a central axis passing through the centers of the wheels (20) on both sides in the vehicle width direction. In any one of Claims 1 thru | or 4 ,
It said base portion (25), a tread variable axle, characterized in that it comprises a box-like portion for accommodating the brake chamber (34) inwardly in a state in which the slide portion (26) is attached (36) ( 14) . An automobile transport trailer (10) comprising the tread variable axle (14) according to any one of claims 1 to 5 .

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