JP3989146B2 - Vehicle axle beam - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a center drop type, that is, an axle beam formed in a substantially crank shape whose center in the vehicle width direction protrudes downward.
[0002]
[Prior art]
In recent years, low floor buses have been developed to facilitate getting on and off the bus. In this low-floor bus, in order to secure a space for interposing a front suspension between the chassis frame and the front axle beam, a center drop type front axle beam in which the center in the vehicle width direction of the beam protrudes downward is used. It has been adopted.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned low floor bus, when the front tire is punctured, the height from the road surface to the lower surface of the front axle beam becomes extremely low, and there is a problem that the most contracted jack cannot be inserted between the road surface and the axle beam. For this reason, the cross member (chassis frame) immediately after the tire house of the punctured front tire was raised using two jacks to change the tire. In this case, the punctured tire will not leave the road surface unless the cross member positioned on the spring, that is, on the opposite side of the road surface of the front suspension device is lifted by the jack and the cross member is raised to the fully extended state of the front suspension device. For this reason, the jack-up amount of the cross member is extremely large, and the workability is poor.
On the other hand, even in vehicles other than the low-floor bus, if the vehicle is punctured on a bad road or is removed from the recess, the height from the road surface to the lower surface of the axle beam becomes so low that a jack cannot be inserted. Therefore, it is necessary to raise the vehicle body other than the axle beam with a jack in the same manner as described above. In this case as well, the vehicle body other than the axle beam has to be raised to the fully extended state of the suspension device, and there is a problem that workability for exchanging tires and getting out of the recesses is poor.
An object of the present invention is to provide an axle beam for a vehicle that can replace a punctured tire or escape from a recess with a single jack and in a relatively short time.
[0004]
[Means for Solving the Problems]
As shown in FIG. 1, the invention according to claim 1 is provided with an axle main body 12 extending in the vehicle width direction, and provided with a lower end continuous to both ends of the axle main body 12 and extending obliquely upward and outward. This is an improvement of the axle beam 11 of the vehicle, which is provided with a pair of shoulder portions 13 each having a pair of knuckle 14 rotatably attached to the upper end and formed in a substantially crank shape.
The characteristic structure is that a pair of jack-receiving contact portions 22 for jacks protrude from the inclined lower surfaces of the pair of shoulder portions 13 , respectively, and the lower surfaces of the pair of receiving-contact contact portions 22 are flat. It is in the place formed in the position higher than the lower surface of the main body 12 .
In the vehicle axle beam according to the first aspect, even if the tire 19 is punctured and the like and the height from the road surface 24 to the lower surface of the axle body 12 is lowered, the distance between the road surface 24 and the receiving contact portion 22 is reduced. A jack 23 can be inserted into the jack. For this reason, the tire 19 can be raised together with the axle beam 11 by extending the jack 23.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the front axle beam 11 of the low floor bus 10 is provided extending in the vehicle width direction, and an axle body 12 and a pair of shoulder portions 13 having lower ends connected to both ends of the axle body 12. With. The pair of shoulder portions 13 are provided to extend obliquely upward and outward, and one end of a pair of front knuckles 14 is rotatably attached to the upper ends of the shoulder portions 13 via a pair of king pins 15, respectively. A pair of front wheels 18 are rotatably attached to the other ends of the pair of front knuckles 14 through bearings 16 and 17, and a pair of front tires 19 are fitted to the pair of front wheels 18, respectively. The axle beam 11 is formed in a substantially crank shape with the center in the vehicle width direction protruding downward. The reason why the axle beam 11 is formed in a substantially crank shape is to secure a space for interposing a front suspension (air spring, coil spring, etc.) between the axle beam 11 and the chassis frame, although not shown. Reference numeral 21 in FIGS. 1 and 2 denotes a front knuckle arm protruding from the front knuckle 14.
[0006]
The characteristic configuration of the present embodiment is that a pair of metal receiving contact portions 22 are provided on the pair of shoulder portions 13 respectively. The bottom surfaces of these gold receiving contact portions 22 are formed flat, and the gold receiving portion 23a of the hydraulic jack 23 that supports and raises and lowers the vehicle body can be contacted to the gold receiving contact portion 22. Further, the height from the road surface 24 to the metal receiving contact portion 23a is formed higher than the most contracted length of the jack 23 when the front tire 19 is punctured.
[0007]
In the front axle beam 11 configured as described above, when one of the pair of front tires 19 is punctured, the front axle beam 11 is inclined toward the punctured front tire 19 and approaches the road surface 24 ( FIG. 1). For this reason, the height from the road surface 24 on the punctured front tire 19 side to the lower surface of the axle body 12 is lower than the most contracted length of the jack 23, and the jack 23 cannot be inserted between the road surface 24 and the lower surface of the axle body 12. In this case, since the gold receiving contact portion 22 is formed at a position higher than the lower surface of the axle main body 12, the jack 23 can be inserted between the road surface 24 and the gold receiving contact portion 22 (FIG. 1). When the jack 23 is extended in this state, the punctured front tire 19 is lifted together with the axle beam 11 (FIG. 2). At this time, the jack 23 lifts the front axle beam 11 located under the spring, that is, on the road surface 24 side of the front suspension device, so that the amount of jack-up is relatively small. As a result, the punctured tire 19 quickly leaves the road surface, so that the tire 19 can be replaced smoothly.
[0008]
In the above embodiment, the low-floor bus is used as the vehicle. However, any vehicle other than the low-floor bus may be used as long as the vehicle has a pair of shoulder portions that are connected to both ends of the axle body and extend obliquely upward and outward. It can also be applied to vehicles.
Further, in the above embodiment, when the front tire of the low floor bus is punctured, a jack is inserted between the flat road and the receiving contact portion, but when the tire of the vehicle other than the low floor bus is punctured on the bad road It can also be applied when the wheel is removed from the recess. In other words, a punctured tire can be replaced by inserting a jack between the rough road and the metal receiving contact part, or jacking up between the road surface and the metal receiving contact part. Then, by inserting timber or the like between the recess and the removed tire, it is possible to easily escape from the recess.
Furthermore, although the hydraulic jack has been described as the jack in the above embodiment, a screw jack, a rack jack, an air jack, or other jacks may be used.
[0009]
【The invention's effect】
As described above, according to the present invention, a pair of receiving abutment portions capable of abutting a jack receiving plate are provided on the pair of shoulder portions of the axle beam, respectively, so that the tire is punctured or the road surface is recessed. Since the height from the road surface to the receiving contact part at the time of derailment to the place is made higher than the maximum contracted length of the jack, even if the tire is punctured, the height from the road surface to the lower surface of the axle body becomes low A jack can be inserted between the road surface and the metal receiving contact portion. As a result, by extending the jack, the tire can be raised together with the axle beam, so that the punctured tire can be replaced smoothly, or timber or the like is inserted between the recess and the removed tire. And can easily escape from the recess.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing a state where a jack is inserted between a receiving contact portion of an axle beam and a road surface according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing a state where the axle beam is raised by the jack.
[Explanation of symbols]
10 Low floor bus (vehicle)
11 Front axle beam (axle beam)
12 Axle body 13 Shoulder 14 Front knuckle (knuckle)
19 Front tire
22 Receiving contact part 23 Hydraulic jack (jack)
23a Money received 24 Road surface

Claims (1)

Axle body (12) provided extending in the vehicle width direction, and a lower end connected to both ends of the axle body (12), extending obliquely upward and outward, and a pair of knuckles (14) rotating at the upper end. A vehicle axle beam (11) comprising a pair of shoulder portions (13) movably attached to each other and formed in a substantially crank shape;
The pair of shoulder portions receiving metal contact portion of a pair of jacks on the lower surface inclined (13) (22) is projected, respectively,
An axle beam for a vehicle, wherein a lower surface of the pair of receiving contact parts (22) is flat and formed at a position higher than a lower surface of the axle body (12) .

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