JP4080814B2 - Suspension device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension device, and more particularly to a suspension device that is used in a vehicle transport vehicle and includes a telescopic axle that is removably inserted into both ends of a hollow guide shaft.
[0002]
[Prior art]
Currently, vehicle carriers for transporting automobiles and the like are used. In such a vehicle transporter, when loading and unloading an automobile, there is known a vehicle that facilitates loading and unloading of a wide vehicle by extending the axle of the wheel outward and widening the width between the wheels. .
[0003]
For example, a pair of movable shafts that rotatably support the wheels is inserted into both sides of a hollow guide shaft so as to be freely inserted into and retracted to form a telescopic axle, and a leaf spring is fixed to the movable shaft. A suspension device having a structure for supporting a part (beam) of a vehicle body is disclosed (see Japanese Patent Publication No. 7-96361). The suspension device having such a structure is provided with a spring support member that guides the movement of the leaf spring accompanying the expansion and contraction of the movable shaft so that the width between the left and right wheels can be changed by moving the movable shaft in and out of the guide shaft. It has become.
[0004]
However, since the suspension device having the above-described structure supports the vehicle body only by the leaf spring, there is a case where the vibration due to the road surface and the impact at the time of braking are strong, and the life of the vehicle body part may be shortened.
[0005]
In order to solve the problems described above, it is conceivable that an air spring is interposed between the leaf spring and the cross member. However, the air spring is fixed on the leaf spring, and the air spring is attached to the lower surface of the cross member. The direct attachment method cannot be applied to the telescopic axle as it is, and has a problem that the trailer has a high vehicle height.
[0006]
For this reason, there has been proposed a suspension device having a structure in which a swing arm supported swingably is provided below the cross member, an air spring is attached to the swing arm, and a laminated leaf spring is disposed below the air spring. (See JP 2000-108605 A). The swing arm of the suspension device having such a structure is provided with a leaf spring guide that guides the movement of the overlap leaf spring accompanying the expansion and contraction of the movable shaft, and the width between the left and right wheels can be changed by expanding and contracting the movable shaft. It is like that.
[0007]
[Problems to be solved by the invention]
However, the swing arm employed in the suspension device having the above-described structure has components that require extremely high work accuracy such as “oscillating flow core (shaft hole into which the pin is inserted)”, and an air spring. Many components such as an “air spring support portion” that supports the spring plate from below, a “lateral displacement stopper” that prevents the lateral displacement by engaging the rear end portion of the laminated leaf spring from above, and the “plate spring guide” described above. Therefore, it took time and effort to produce it. In addition, since the work of assembling the swing arm to the cross member and the work of assembling the air spring to the swing arm are complicated, it takes time to manufacture the suspension device itself and the structure of the suspension device is complicated.
[0008]
An object of the present invention is to provide a suspension device that includes a telescopic axle and can obtain a predetermined air suspension effect while having a simple structure that is extremely easy to manufacture.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention according to claim 1 is a telescopic axle formed by inserting a pair of movable shafts rotatably supporting a wheel on both sides of a hollow guide shaft, A suspension comprising a leaf spring attached to the movable shaft and moving as the movable shaft moves in and out, a cross member in which front and rear end portions of the leaf spring are disposed in the vicinity thereof, and an outrigger for raising the vehicle body by extension. In the apparatus, an air spring is mounted on an upper portion of the leaf spring, and the cross member is supported on an upper portion of the air spring when the telescopic axle is not extended, and the air spring is extended when the telescopic axle is extended. And a supported arm that is spaced apart from the upper part.
[0010]
According to the first aspect of the present invention, the air spring is placed above the leaf spring, and the cross member is supported by the upper arm of the air spring when the movable shaft is not extended. Therefore, a leaf spring and an air spring can be interposed between the telescopic axle and the cross member when the telescopic axle is not extended, such as during travel. Therefore, vibrations and impacts transmitted to the vehicle body through the wheels and the telescopic axle during traveling and braking can be mitigated by the leaf spring and the air spring. Further, when the telescopic axle is extended, the supported arm can be separated from the air spring.
[0011]
Therefore, the suspension device according to the present invention can realize free extension of the telescopic axle while having a simple structure that does not employ a swing arm having many components requiring high work accuracy, The air suspension effect can be obtained.
[0012]
According to a second aspect of the present invention, in the suspension device according to the first aspect, an air tank for storing air supplied into the air spring and a relative height of the vehicle body with respect to the telescopic axle are maintained constant. And a leveling valve that allows the air inside the air spring to enter and exit, and a blocking means that blocks the supply of air from the air tank to the inside of the air spring as the outrigger extends.
[0013]
According to the second aspect of the present invention, when the outrigger is extended to raise the vehicle body and the supported arm is separated from the air spring, the blocking means prevents the air from being supplied into the air spring. be able to. Therefore, it is possible to prevent a situation in which air is supplied to the inside of the air spring to which no load is applied and the internal pressure rises and the air spring is abnormally deformed.
[0014]
According to a third aspect of the present invention, in the suspension device according to the first or second aspect, the suspension device further includes an exhaust unit that discharges air inside the air spring separately from the leveling valve when the outrigger extends. .
[0015]
According to the third aspect of the present invention, when the outrigger is extended to raise the vehicle body and the supported arm is separated from the air spring, the air inside the air spring can be discharged by the exhaust means. . Therefore, air is quickly discharged from the air spring, and abnormal expansion of the air spring can be prevented, and damage to the air spring can be prevented.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 1 is a plan view of the suspension device according to the present embodiment (viewed from above), and FIG. 2 is a view of the suspension device shown in FIG. 1 viewed from the direction of arrow II. In the following description, the arrow A direction in FIG. 1 is “front”, the arrow B direction is “rear”, the arrow C direction is “left”, and the arrow D direction is “right”.
[0018]
FIG. 3 is a view showing a state in which the outrigger 60 of the suspension apparatus shown in FIG. 2 is extended to raise the vehicle body. 4 is a plan view (viewed from above) showing a state in which the outrigger 60 is shortened and the vehicle body is lowered after extending the telescopic axle 10 of the suspension apparatus shown in FIG. FIG. 5 is a view of the suspension apparatus shown in FIG. Since the suspension device has a substantially symmetrical structure, only the structure on the right side will be described in the present embodiment.
[0019]
As shown in FIGS. 1 and 2, the suspension device according to the present embodiment is provided immediately before the telescopic axle 10, the wheel 20, the leaf spring 30, the front cross member 41 provided immediately before the wheel 20, and the wheel 20. The rear cross member 42, the air spring 50, the outrigger 60, and the like. Hereinafter, each component will be described.
[0020]
As shown in FIG. 1, the telescopic axle 10 includes a hollow guide shaft 11 extending in the left-right direction, and a pair of movable shafts 12 slidably inserted at both ends of the guide shaft 11. Yes. The guide shaft 11 is connected to the front cross member 41 by a torque rod 13. A shock absorber 14 is interposed between the guide shaft 11 and the front cross member 41.
[0021]
An arm 15 is fixed to the right end of the movable shaft 12 upward, and a wheel support shaft 16 projects from the upper portion of the arm 15 toward the right outer side. A movable shaft extending and contracting arm 17 is fixed to the movable shaft 12. The movable shaft 12 is connected to the telescopic cylinder 18 via the movable shaft telescopic arm 17. The telescopic axle 10 is configured such that the movable shaft 12 moves outward and inward relative to the guide shaft 11 in response to the expansion and contraction of the telescopic cylinder 18. The telescopic cylinder 18 is disposed immediately behind and in parallel with the telescopic axle 10, and its end is connected to the movable shaft telescopic arm 17.
[0022]
The wheel 20 is rotatably supported by the wheel support shaft 16 of the telescopic axle 10. The wheel 20 moves in the same direction as the movable shaft 12 moves outward and inward.
[0023]
The leaf spring 30 is made of a long steel plate as shown in FIGS. 1 and 2 and functions to alleviate an impact transmitted to the vehicle body due to its elastic deformation. The leaf spring 30 has an upper portion in the vicinity of the center in the front-rear direction fixed to the lower portion of the movable shaft 12, and moves in the same direction as the movable shaft 12 moves outward and inward, like the wheel 20. .
[0024]
The upper part of the front end portion 31 of the leaf spring 30 abuts against the abutting portion 41b of the front cross member 41 when the wheel 20 is grounded, so that the impact transmitted to the vehicle body is reduced. On the other hand, the lower portion of the front end portion 31 of the leaf spring 30 is supported from below by the front guide pipe 41a of the front cross member 41 when the vehicle body is raised as the outrigger 60 extends. Further, the lower portion of the rear end portion 32 of the leaf spring 30 is supported by the rear guide pipe 42a of the rear cross member 42 when the vehicle body is lifted as the outrigger 60 extends.
[0025]
As shown in FIGS. 1 and 2, an air spring 50 is placed and fixed on an upper portion of a portion (hereinafter referred to as “rear portion”) 33 between the center portion in the front-rear direction and the rear end portion 32 of the leaf spring 30. Has been. The upper part 51 of the air spring 50 functions to support the supported arm 42c of the rear cross member 42 when the movable shaft 12 is not extended, as will be described later. For this reason, the impact received by the wheel 20 and the telescopic axle 10 during traveling or braking can be mitigated by the leaf spring 30 and the air spring 50.
[0026]
The front cross member 41 and the rear cross member 42 are long members extending in the left-right direction, and constitute a part of the vehicle body. The front cross member 41 and the rear cross member 42 are connected by a frame (not shown) extending in the front-rear direction.
[0027]
The front cross member 41 is provided with a front guide pipe 41a that slidably supports the front end portion 31 of the leaf spring 30 from below. The front guide pipe 41a supports the front end portion 31 of the leaf spring 30 from below when the front cross member 41 is pushed upward, and guides the movement of the leaf spring 30 to the outside.
[0028]
Further, the front cross member 41 is provided with a contact portion 41 b that contacts the upper portion of the front end portion 31 of the leaf spring 30. The contact portion 41b is a portion that is supported by the front end portion 31 of the leaf spring 30 during traveling or stopping, and transmits the suspension effect of the leaf spring 30 to the vehicle body. The front guide pipe 41 a and the contact portion 41 b are provided in a front spring receiving portion 41 c provided in the front cross member 41 for storing the front end portion 31 of the leaf spring 30.
[0029]
The rear cross member 42 is provided with a rear guide pipe 42a that supports the rear end portion 32 of the leaf spring 30 so as to be slidable from below. The rear guide pipe 42 a supports the rear end portion 32 of the leaf spring 30 from below and guides the movement of the leaf spring 30 to the outside when the rear cross member 42 is pushed upward. The rear guide pipe 42 a is provided in a rear spring receiving portion 42 b provided in the rear cross member 42 for storing the rear end portion 32 of the leaf spring 30.
[0030]
Moreover, as shown in FIG.1 and FIG.2, the supported arm 42c supported by the upper part 51 of the air spring 50 mentioned later is protrudingly provided by the rear side cross member 42 toward the front. The supported arm 42c is supported by the upper part 51 of the air spring 50 when the telescopic axle 10 is not extended, and is separated from the upper part 51 of the air spring 50 as the outrigger 60 extends.
[0031]
A guide portion 42d for fitting the upper portion 51 of the air spring 50 is provided at the front end portion of the supported arm 42c. When the telescopic axle 10 is in the non-extended state and the wheel 20 is grounded, the upper portion 51 of the air spring 50 is fitted to the guide portion 42d, and the rear cross member 42 and the leaf spring 30 are interposed. The air spring 50 is interposed (see FIG. 2). For this reason, the impact received by the wheel 20 and the telescopic axle 10 during vehicle travel and braking can be mitigated by the leaf spring 30 and the air spring 50.
[0032]
On the other hand, when the outrigger 60 is extended and the wheel 20 is separated from the ground as when the vehicle is loaded and unloaded, the fitting state between the guide portion 42d of the supported arm 42c and the upper portion 51 of the air spring 50 is released. (See FIG. 3). For this reason, since the rear cross member 42 and the air spring 50 are separated from each other, an integral movement of the movable shaft 12, the leaf spring 30, and the air spring 50 can be allowed.
[0033]
The air spring 50 is connected to the upper portion of the rear portion 33 of the plate spring 30 and supports the supported arm 42c of the rear cross member 42 by the upper portion 51, and is transmitted to the vehicle body by elastic deformation thereof. It fulfills the function of mitigating impact. As described above, the upper portion 51 of the air spring 50 is fitted to the guide portion 42d of the supported arm 42c when the telescopic axle 10 is not extended.
[0034]
The suspension device according to the present embodiment includes a leveling valve 52 as shown in FIG. The leveling valve 52 functions to allow air in and out of the air spring 50 in order to keep the relative height of the vehicle body with respect to the telescopic axle 10 constant regardless of the load.
[0035]
A leveling valve lever 53 is attached to the leveling valve 52. As shown in FIG. 2, when the leveling valve lever 53 is in the set state, the supply of air to the air spring 50 is stopped.
[0036]
Further, as shown in FIG. 3, when the relative distance between the telescopic axle 10 and the vehicle body is increased by the extension of the outrigger 60, the leveling valve lever 53 is tilted to detect that. The leveling valve 52 that receives the detection signal from the leveling valve lever 53 discharges air from the air spring 50.
[0037]
On the other hand, as shown in FIG. 5, when the relative distance between the telescopic axle 10 and the vehicle body is reduced by shortening the outrigger 60, the leveling valve lever 53 is tilted to detect that fact. The leveling valve 52 that receives the detection signal from the leveling valve lever 53 supplies air to the air spring 50 from the air tank 80 (see FIG. 8).
[0038]
As shown in FIG. 1, the outrigger 60 is a telescopic column attached to a frame 70 erected on the right end portion of the front cross member 41 so as to extend in the vertical direction and expands and contracts by a cylinder. It functions to raise and lower the entire vehicle body including the member 41 and the rear cross member 42. A similar frame is erected on the left end portion of the front cross member 41, and the outrigger 60 is similarly attached thereto.
[0039]
A leg portion 61 is provided at the lower end portion of the outrigger 60. When the outrigger 60 is not extended, the leg portion 61 is separated from the ground and the wheel 20 is grounded (see FIG. 2). On the other hand, when the outrigger 60 is extended, the leg portion 61 is pressed against the ground and the vehicle body is raised (see FIG. 3).
[0040]
FIG. 6 is an explanatory diagram for explaining the configuration of the upper part of the outrigger 60. A control valve 62 and a control lever 63 in contact with the control valve 62 are provided on the upper part of the outrigger 60.
[0041]
FIG. 7 is an enlarged view of a portion VII in FIG. 6 (a portion in the vicinity of the control valve 62 and the control lever 63). The control lever 63 is pivotally attached to the upper portion of the outrigger 60 by a hinge portion 64. When the outrigger 60 is not extended, the control lever 63 is in contact with the lower end portion of the control valve 62 as shown by a solid line in FIG. Is in a state. On the other hand, the control lever 63 rotates downward about the hinge portion 64 as the outrigger 60 extends as shown by a two-dot chain line in FIG. At this time, the contact state between the control lever 63 and the control valve 62 is released.
[0042]
Next, control of the air flow of the suspension device according to the present embodiment will be described. FIG. 8 is an explanatory diagram for explaining a configuration relating to air flow control of the suspension device. Air in the air tank 80 is supplied to the air spring 50 through the control valve 62 and the leveling valve 52 described above.
[0043]
The control valve 62 functions to shut off the supply of air from the air tank 80 to the inside of the air spring 50 simultaneously with the extension of the outrigger 60. That is, the control valve 62 is a blocking means in the present invention. As shown in FIG. 7, when the outrigger 60 is extended, the control lever 63 pivots downward about the hinge portion 64, and when the control lever 63 is separated from the control valve 62, the outrigger 60 is extended. Such a signal is transmitted from the control lever 63 to the control valve 62. Upon receiving such a signal, the control valve 62 blocks air supplied from the air tank 80 to the air spring 50.
[0044]
Further, the suspension device according to the present embodiment is provided with an electromagnetic valve 54 that discharges the air inside the air spring 50 at a predetermined timing. The electromagnetic valve 54 functions to discharge air inside the air spring 50 separately from the leveling valve 52 simultaneously with the extension of the outrigger 60. That is, the electromagnetic valve 54 is an exhaust means in the present invention.
[0045]
The functions of the control valve 62 and the electromagnetic valve 54 will be described more specifically. In general, the amount and timing of air supply into the air spring 50 are controlled by the leveling valve 52 and the leveling valve lever 53 as described above. When the vehicle body is raised by the extension of the outrigger 60, the vehicle body becomes relatively high with respect to the telescopic axle 10 (see FIG. 3), and the air inside the air spring 50 is automatically discharged by the leveling valve 52.
[0046]
However, the air discharge speed by the leveling valve 52 cannot catch up with the rising speed of the vehicle body due to the extension of the outrigger 60, and the guide portion 42 d of the supported arm 42 c of the rear cross member 42 and the upper portion 51 of the air spring 50 The fitting state may not be released easily.
[0047]
Therefore, the control valve 62 is introduced, and the supply of air from the air tank 80 into the air spring 50 is shut off simultaneously with the extension of the outrigger 60. Further, the electromagnetic valve 54 is introduced, and the electromagnetic valve 54 is operated simultaneously with the extension of the outrigger 60 to discharge the air inside the air spring 50. With the functions of the control valve 62 and the electromagnetic valve 54, the fitted state between the guide portion 42d of the supported arm 42c and the upper portion 51 of the air spring 50 can be easily released.
[0048]
Further, even after the outrigger 60 is extended to raise the vehicle body and the supported arm 42c is separated from the air spring 50, the control valve 62 can prevent air from being supplied into the air spring 50. As a result, an increase in the internal pressure of the air spring 50 can be prevented. Accordingly, it is possible to prevent the air spring 50 from being abnormally deformed.
[0049]
Next, the operation of the suspension device according to the present embodiment will be described.
[0050]
During normal running as shown in FIGS. 1 and 2, the outrigger 60 is in a shortened state, and the leg portion 61 is separated from the ground (see FIG. 2). At this time, the telescopic cylinder 18 is also in a non-extended state, and the movable shaft 12 of the telescopic axle 10 is drawn into the guide shaft 11, and accordingly, the leaf spring 30 and the wheel 20 are disposed inside (see FIG. 1). .
[0051]
In this state, as shown in FIG. 2, the contact portion 41 b of the front cross member 41 is placed on the upper portion of the front end portion 31 of the leaf spring 30. A supported arm 42 c of the rear cross member 42 is placed on the rear portion 33 of the leaf spring 30 via the air spring 50. In other words, the front cross member 41 is directly supported by the leaf spring 30, while the rear cross member 42 is supported by the leaf spring 30 via the air spring 50.
[0052]
On the other hand, when the vehicle is loaded, first, the outrigger 60 is extended and the ground is pressed by the legs 61 to raise the front cross member 41 and the rear cross member 42. Due to this rise, the abutting portion 41 b provided on the front cross member 41 is separated from the front end portion 31 of the leaf spring 30, and the guide portion 42 d of the supported arm 42 c of the rear cross member 42 is the upper portion 51 of the air spring 50. Separate from.
[0053]
At this time, the control valve 62 is actuated as the outrigger 60 extends, and the supply of air from the air tank 80 to the inside of the air spring 50 is shut off. At the same time, the electromagnetic valve 54 is activated, and air inside the air spring 50 is discharged separately from the leveling valve 52. Further, since the relative distance between the telescopic axle 10 and the vehicle body increases with the extension of the outrigger 60, the leveling valve 52 functions and the air inside the air spring 50 is discharged.
[0054]
When the outrigger 60 is further extended to raise the front cross member 41 and the rear cross member 42, the front guide pipe 41a of the front cross member 41 comes into contact with the front end portion 31 of the leaf spring 30 from below, and this is moved upward. Push up. At the same time, the rear guide pipe 42a of the rear cross member 42 comes into contact with the rear end portion 32 of the leaf spring 30 from below and pushes it upward. Thereby, the whole leaf | plate spring 30 is pushed up and the wheel 20 floats from the ground via the expansion-contraction axle 10 (refer FIG. 3).
[0055]
Subsequently, the telescopic cylinder 18 is extended. The left and right movable shafts 12 are each extended outward with respect to the guide shaft 11 of the telescopic axle 10, whereby the leaf spring 30 has its front end portion 31 guided by the front guide pipe 41a and the rear end portion 32. Moves outward while being guided by the rear guide pipe 42a. At this time, the wheel 20 similarly moves outward (see FIG. 4).
[0056]
When the wheel 20 is moved to a predetermined position outside, the extension of the telescopic cylinder 18 is stopped, the outrigger 60 is shortened, the front cross member 41 and the rear cross member 42 are lowered, and the wheel 20 is landed. Thereafter, the outrigger 60 is further shortened and automatically stopped at a height at which the rear end portion 32 of the leaf spring 30 slightly contacts the lower surface of the rear spring receiving portion 42b of the rear cross member 42. That is, the leaf spring 30 hardly bears the vehicle body weight, and the outrigger 60 supports most of the vehicle body weight including the loaded vehicle. In this state, a predetermined vehicle loading operation is performed.
[0057]
When the vehicle is loaded, as shown in FIG. 5, the leveling valve 52 is in a position that functions to supply air into the air spring 50, but the control valve 62 allows air to enter the air spring 50. Is prevented from being supplied.
[0058]
By extending the telescopic axle 10 to widen the width between the wheels 20, it is possible to easily carry out loading work of a wide vehicle. In addition, what is necessary is just to perform a procedure reverse to an above-described procedure in order to return to the normal state which narrowed the width | variety between the wheels 20 after a vehicle loading operation | work.
[0059]
In the suspension device according to the present embodiment, the air spring 50 is placed and fixed above the leaf spring 30, and the rear cross member 42 is located at the upper portion 51 of the air spring 50 when the telescopic axle 10 is not extended. Since the supported arm 42c is supported by the blade spring 30, the leaf spring 30 and the air spring 50 can be interposed between the telescopic axle 10 and the rear cross member 42 when the telescopic axle 10 is not extended, such as during travel. . Therefore, vibrations and impacts transmitted to the vehicle body via the wheel 20 and the telescopic axle 10 during traveling or braking can be mitigated by the leaf spring 30 and the air spring 50.
[0060]
Further, in the suspension device according to the present embodiment, the supported arm 42c of the rear cross member 42 is separated from the upper portion 51 of the air spring 50 as the outrigger 60 extends, so that the outrigger 60 extends. Accordingly, the engagement relationship between the air spring 50 and the rear cross member 42 can be released, and the extension of the telescopic axle 10 can be allowed.
[0061]
Therefore, the suspension device according to the present embodiment can realize free extension of the telescopic axle 10 while having a simple structure that does not employ a swing arm having many components that require high work accuracy. In addition, a predetermined air suspension effect can be obtained.
[0062]
In addition, the suspension device according to the present embodiment includes the control valve 62 that shuts off the supply of air to the inside of the air spring 50 as the outrigger 60 is extended. Air can be prevented from being supplied into the spring 50. Therefore, even when the vehicle body is lowered for vehicle loading work, air is supplied to the inside of the air spring 50 and the internal pressure rises to prevent the air spring 50 from being abnormally deformed or damaged. be able to.
[0063]
Further, since the suspension device according to the present embodiment includes the electromagnetic valve 54 that discharges air inside the air spring 50 as the outrigger 60 extends, the outrigger 60 is extended to connect the supported arm 42c to the air spring. When separated from the air 50, the air inside the air spring 50 can be quickly discharged. Therefore, abnormal deformation and damage of the air spring when the vehicle body is lifted by extension of the outrigger 60 can be effectively prevented.
[0064]
【The invention's effect】
According to the first aspect of the present invention, the air spring is connected to the upper part of the leaf spring, and the cross member includes the supported arm supported on the upper part of the air spring when the telescopic axle is not extended. In addition, vibration and impact transmitted to the vehicle body via the wheels and the telescopic axle during braking can be mitigated by the leaf spring and the air spring. Further, when the telescopic axle is extended, the supported arm can be separated from the upper part of the air spring. Therefore, the suspension device according to the present invention can realize free extension of the telescopic axle while having a simple structure that is easy to manufacture, and can obtain a predetermined air suspension effect.
[0065]
According to the second aspect of the invention, since the shut-off means for shutting off the supply of air to the inside of the air spring as the outrigger extends is provided, air is supplied to the inside of the air spring in a state where a load from above does not act. It is possible to prevent the air spring from being deformed abnormally.
[0066]
According to the invention described in claim 3, since the exhaust means for discharging the air inside the air spring is provided with the extension of the outrigger, the air inside the air spring can be discharged before the air is discharged by the leveling valve. It is possible to effectively prevent abnormal deformation of the air spring when the vehicle body is lifted by the extension of the outrigger.
[Brief description of the drawings]
FIG. 1 is a plan view (viewed from above) of a suspension device according to the present embodiment.
FIG. 2 is a view of the suspension device shown in FIG. 1 as viewed from the direction of arrow II.
3 is a view showing a state where an outrigger of the suspension device shown in FIG. 2 is extended to raise the vehicle body. FIG.
4 is a plan view (viewed from above) showing a state in which a vehicle is loaded after the telescopic axle of the suspension device shown in FIG. 3 is extended and the vehicle body is lowered by shortening the outriggers. FIG.
5 is a view of the suspension device shown in FIG. 4 as viewed from the direction of arrow V. FIG.
6 is an explanatory diagram for explaining a configuration of an upper part of an outrigger of the suspension device shown in FIG. 1; FIG.
7 is an enlarged view of a portion VII in FIG. 4;
FIG. 8 is an explanatory diagram for explaining a configuration related to air flow control of the suspension device according to the present embodiment;
[Explanation of symbols]
10 Telescopic axle
11 Guide shaft
12 Movable shaft
13 Torque rod
14 Shock absorber
15 arms
16 Wheel support shaft
17 Movable shaft telescopic arm
18 Telescopic cylinder
20 wheels
30 leaf spring
31 Front end
32 Rear end
33 Rear part
41 Front cross member
41a Front guide pipe
41b Contact part
41c Front spring support
42 Rear cross member
42a Rear guide pipe
42b Rear spring support
42c Supported arm
42d Guide
50 Air spring
51 Top
52 Leveling valve
53 Leveling valve lever
54 Solenoid valve
60 Outrigger
61 legs
62 Control valve
63 Control lever
64 Hinge part
70 frames
80 Air tank

Claims (3)

A telescopic axle formed by inserting a pair of movable shafts for rotatably supporting wheels on both sides of a hollow guide shaft, and a leaf spring attached to the movable shaft and moving as the movable shaft enters and exits. And a suspension member comprising a cross member in which front and rear end portions of the leaf spring are disposed in the vicinity thereof, and an outrigger that raises the vehicle body by extension,
An air spring is placed on top of the leaf spring;
The cross member is
On the other hand, the suspension device is provided with a supported arm that is supported on an upper portion of the air spring when the telescopic axle is not extended and is separated from an upper portion of the air spring when the telescopic axle is extended. An air tank for storing air to be supplied into the air spring;
A leveling valve that allows the air inside the air spring to enter and exit in order to maintain a constant relative height of the vehicle body with respect to the telescopic axle;
A blocking means for blocking the supply of air from the air tank to the inside of the air spring as the outrigger extends,
The suspension device according to claim 1, further comprising: The suspension apparatus according to claim 1, further comprising an exhaust unit that discharges air inside the air spring separately from the leveling valve when the outrigger extends.

Images