JPH0627447Y2 - Vehicle suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a suspension system for a vehicle.

[Prior Art] As a suspension device for a vehicle-type crane, a truck, or the like, there is one that supports a vehicle body by a suspension cylinder. FIG. 4 shows a self-propelled vehicle-type crane equipped with the above-mentioned suspension system. In the figure, reference numeral 1 denotes a vehicle body, on which a crane device including a boom 3 and a winch 4 and a driver's cab are provided. A swivel base 2 provided with 5 is provided. Reference numeral 6 is an outrigger provided in front of and behind the vehicle 1. 7 is a wheel, and a vehicle body 1
Are supported by front and rear wheel support arms 8, 8 supporting front and rear wheels 7, 7 by suspension cylinders 9, 9, respectively.

Explaining the structure of the suspension system for this vehicle-type crane, FIG. 5 shows the suspension system on the rear side of the above-mentioned vehicle-type crane, in which 10 is a hub of the rear wheel 7, a wheel 7a and a tire 7b. Wheels 7 consisting of are attached to this hub 10. The hub 10 is rotatably supported by a bracket 11 provided at an end of the rear wheel support arm 8 that also serves as a differential gear case via a bearing. Although not shown, an axle fixed to the center of the hub 10 is inserted into the bracket 11, and the axle is connected to the wheel drive shaft in the wheel support arm 8 via a universal joint. The suspension cylinder 9 has its base end pivotally connected to the side portion of the vehicle body 1 by a pin 12a so as to be rotatable in the vehicle width direction, and the tip of the rod 9a is attached to the wheel support arm 8 by the pin 12b in the vehicle width direction. It is rotatably pivotally connected to the vehicle body 1 and is installed between the wheel support arm 8 and the vehicle body 1 is supported by the wheel support arm 8 via the suspension cylinder 9. Although the suspension unit on the rear side is shown in FIG. 5, the suspension unit on the front side has the same structure as described above. However, the front wheel support arm 8 also serves as a differential case when the front wheel 7 is also driven, and only supports the wheel 7 when the front wheel 7 is not driven.

In addition, the above-mentioned vehicle-shaped crane generally has front and rear wheels 7,7.
The bracket 11 pivotally supporting the hubs 10 of the front and rear wheels 7 and 7 for steering is driven by a king pin (not shown) at the bracket insertion end of the wheel support arm 8. ) Is rotatably supported in the steering direction and is rotated by a steering mechanism (not shown).

On the other hand, in FIG. 4, 13 is a hydraulic unit provided in the vehicle body 1, and the suspension cylinders 9, 9 support the vehicle body 1 by the hydraulic pressure supplied from the hydraulic unit 13 via the hydraulic pipes 14, 14. At the same time, the wheels 7 and 7 expand and contract with the vertical movement of the wheels 7 to suppress the swinging of the vehicle body. Further, the suspension cylinders 9 and 9 are configured to be locked in the most contracted state during the load hoisting traveling in which the hoisted load is hoisted.

[Problems to be solved by the invention]

By the way, in a suspension system in which a vehicle body is supported by a suspension cylinder, since the weight of the vehicle body 1 including the weight of a crane device or the like on the swivel base 2 is applied to the wheel support arm 8 via the suspension cylinder 9, the end portion of the wheel is supported. Although a moment acts on the wheel support arm 8 supported by 7, the conventional suspension system connects the suspension cylinder 9 to the wheel support arm 8 near the bracket 11 as shown in FIG. The problem is that the moment acting on the wheel support arm 8 is quite large.

That is, the moment acting on the wheel support arm 8 is
From the position where the suspension cylinder is connected to the wheel support arm 8 to the wheel 7
Is determined by the distance to the wheel support arm 8 and the weight of the vehicle body applied to the wheel support arm 8 via the suspension cylinder 9. Therefore, in order to reduce the moment acting on the wheel support arm 8, the suspension cylinder 9 should be brought as close as possible to the wheel 7. It may be connected to the support arm 8. However, since the end of the wheel support arm 8 is inserted into the bracket 14 which pivotally supports the hub 11, the suspension cylinder 9 is avoided from the bracket 11 in the conventional suspension system. Therefore, a large bending force is applied to the wheel support arm 8 because the distance between the wheel support arm 8 and the suspension cylinder connection position to the wheel support arm 8 cannot be reduced. In particular, a considerably large bending force is applied when the suspension cylinder 9 is locked and a load traveling is performed).

For this reason, conventionally, it has been considered that the suspension cylinder 9 is connected not to the wheel support arm 8 but to the bracket 11 which pivotally supports the hub 10 as shown by a chain line in FIG. If the suspension cylinder 9 is connected to the bracket 11, the distance between the suspension cylinder connection position and the wheel 7 can be reduced, and the moment acting on the wheel support arm 8 can be reduced.

However, in a suspension system in which a bracket 11 pivotally supporting a hub 10 for allowing the wheels 7 to be steered is supported at the bracket insertion end of the wheel support arm 8 via a kingpin so as to be rotatable in the steering direction. In order to allow the steering rotation of the bracket 11, it is necessary to connect the suspension cylinder 9 to the bracket 11 via the universal joint A as shown in FIG. If the universal joint A is connected via the bracket 11, there is a concern that the weight of the vehicle body will be applied to the universal joint A, which has a complicated structure, and the universal joint A may break down. There was a problem that the manufacturing cost would be high.

[Means for solving problems]

According to this invention, a king pin that supports a bracket that pivotally supports a wheel hub is fixed to a bracket insertion end of a wheel support arm, and this king pin is inserted into a pin receiving hole provided in the bracket to attach the bracket to the king pin. The suspension cylinder is supported rotatably in the steering direction, the upper end of the king pin is projected onto the bracket, and the suspension cylinder is pivotally connected to the upper end of the king pin to establish a suspension cylinder connection position to a wheel support arm. The distance to the wheel is reduced to reduce the moment acting on the wheel support arm.

[Action]

That is, this invention does not connect the suspension cylinder to the bracket that is steerably rotated together with the hub, but projects the upper end of the king pin fixed to the bracket insertion end of the wheel support arm onto the bracket, and the upper end of the king pin. According to the present invention, the distance between the position where the suspension cylinder is connected to the wheel support arm and the wheel can be reduced to reduce the moment acting on the wheel support arm. Also, since the suspension cylinder is pivotally connected to the kingpin fixed to the wheel support arm, the suspension cylinder only needs to be pivotally connected to the kingpin so as to be rotatable only in the vehicle width direction. From the universal cylinder to the suspension cylinder, as when connecting the suspension cylinder to a bracket that is steered with the hub. There is no need to use the joint.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 for the suspension system on the rear side of the vehicle crane shown in FIG. Incidentally, in the figure, the same parts as those of the conventional suspension device shown in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted.

1 to 3, 9 is a rear wheel support arm which also serves as a differential case, 11 is a bracket which pivotally supports the hub 10 of the wheel 7, and the end of the wheel support arm 9 is inserted into the bracket 11. ing. At the bracket insertion end of the wheel support arm 9, the king pins 15 and
5 is fitted and fixed by means such as shrink fitting, and the king pins 15 and 15 are inserted into the pin receiving holes 16 and 16 provided on the upper and lower sides of the bracket 11 so that the bracket 11 can be rotated in the steering direction. I support you. Incidentally, FIG. 2 and FIG.
In the figure, 17 is a steering arm attached to a side surface of a bracket 11, 18 is a steering cylinder, and 19 are left and right brackets 1 supported at both ends of a wheel support arm 9.
The bracket 11 is a tie rod that connects the first steering arm 17 with the steering cylinder 18, and the bracket 11 is steerably rotated about the king pins 15 and 15. In FIG. 1, 20 is a wheel drive shaft that is passed through the wheel support arm 8, 21 is an axle fixed to the center of the hub 10, and the axle 21 is a bracket 11
It is connected to the wheel drive shaft 20 through a universal joint 22.

In addition, the king pins 15 and 1 fixed to the bracket insertion end of the wheel support arm 9 and supporting the bracket 11.
5, the upper end of the upper king pin 15 is projected onto the bracket 11 through the pin receiving hole 16. The upper end of the upper king pin 15 has a base end on the side of the vehicle body 1 by means of a pin 12a. The rod 9a of the suspension cylinder 9, which is pivotally connected so as to be pivotable in any direction, is pivotally connected so as to be pivotable in the vehicle body width direction. The rod 9a of the suspension cylinder 9 has a kingpin mounting bracket 2 at its tip.
3 is pivotally attached by a hinge pin 24 extending in the front-rear direction of the vehicle body 1, and this kingpin mounting bracket 23 is fixed to the upper end of the kingpin 15 by a bolt 25 so as to be connected to the kingpin 15.

That is, as described above, this suspension system includes the kingpin 1 that supports 11 of the bracket that pivotally supports the hub 10 of the wheel 7.
5 is fixed to the bracket insertion end of the wheel support arm 8,
The kingpin 15 is inserted into a pin receiving hole 16 provided in the bracket 11 so that the kingpin 15 supports the bracket 11 so as to be rotatable in the steering direction, and the upper end of the kingpin 15 is projected onto the bracket 11. The suspension cylinder 9 is pivotally connected to the upper end of the king pin 15, and the suspension device does not connect the suspension cylinder 9 to the bracket 11 which is steered and rotated together with the hub 10 but to connect the suspension cylinder 9 to the wheel support arm 8. Attach the upper end of the king pin 15 fixed to the bracket insertion end to the bracket 11.
Since the suspension cylinder 9 is pivotally connected to the upper end of the king pin 15 by projecting it upward, the distance between the suspension cylinder connection position to the wheel support arm 8 and the wheel 7 is increased according to this suspension device. By making it smaller, the moment acting on the wheel support arm 8 can be made smaller. Further, in this suspension device, the suspension cylinder 9 is pivotally connected to the king pin 15 fixed to the wheel support arm 8. Therefore, the suspension cylinder 9 is pivoted with respect to the king pin 15 only in the vehicle width direction. It only has to be fixedly connected, and thus it is not necessary to use a universal joint to connect the suspension cylinder 9 as in the case of connecting the suspension cylinder 9 to the bracket 11 which is steered with the hub 10.

In the above embodiment, the suspension device on the rear side of the vehicle crane was described, but the suspension device of the present invention can be applied to the suspension device on the front side of the vehicle crane, and can be applied to the vehicle crane. Of course, the present invention can be applied to a suspension system for trucks and other vehicles.

[Effect of device]

According to this invention, a king pin that supports a bracket that pivotally supports a wheel hub is fixed to a bracket insertion end of a wheel support arm, and this king pin is inserted into a pin receiving hole provided in the bracket to attach the bracket to the king pin. Since the upper end of the king pin is projected on the bracket and the suspension cylinder is pivotally connected to the upper end of the king pin, the suspension cylinder is connected to the wheel support arm. The distance between the wheel and the wheel can be reduced to reduce the moment acting on the wheel support arm, and because the suspension cylinder is pivotally connected to the kingpin fixed to the wheel support arm. The cylinder only needs to be pivotally connected to the kingpin so that it can rotate only in the width direction of the vehicle body. There is no need to use a universal joint connecting the suspension cylinder as in the case of connecting the bracket to the suspension cylinder, which is steered pivots.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention,
FIG. 1 is an enlarged sectional view of a suspension cylinder connecting portion of a suspension device,
2 and 3 are a front view and a plan view of the suspension system. 4 and 5 are a side view of a vehicle-type crane equipped with a suspension system for supporting a vehicle body by a suspension cylinder and a front view of a conventional suspension system, and FIG. 6 is used for connecting the suspension cylinder to a bracket. FIG. 3 is a cross-sectional view of a universal joint. DESCRIPTION OF SYMBOLS 1 ... Car body, 7 ... Wheel, 8 ... Wheel support arm, 9 ... Suspension cylinder, 10 ... Hub, 11 ... Bracket, 15 ... King pin, 16 ... Pin receiving hole.

Claims (1)

[Scope of utility model registration request] 1. A suspension system in which a bracket supporting a wheel hub is rotatably supported by a wheel support arm via a king pin and the vehicle body is supported by the wheel support arm via a suspension cylinder. Is fixed to the bracket insertion end of the wheel support arm, and this kingpin is inserted into a pin receiving hole provided in the bracket so that the bracket is rotatably supported in the steering direction and the upper end of the kingpin is fixed. A suspension system for a vehicle, wherein the suspension cylinder is pivotally connected to an upper end of the kingpin by protruding onto the bracket.