JPH0626535Y2 - Outrigger mounting structure for special vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a structure for mounting an outrigger in a special vehicle such as a crane truck.

(Prior Art) As a mounting structure of an outrigger in a conventional special vehicle such as a crane vehicle, an outrigger main body provided at a front portion and a rear portion of a body frame of the special vehicle is expanded / contracted in a lateral (left / right) direction of the body frame. And an outrigger provided with a float that moves up and down in the vertical direction at the end of the expansion and contraction portion, which is provided substantially symmetrically with respect to the longitudinal centerline of the vehicle body (so-called H-shaped outrigger). , For example, Kaikai Sho 5
As shown in Japanese Patent Laid-Open No. 9-193760 (see FIG. 3), the base portion of the main body 11 of the outrigger 10 arranged below the vehicle body frame 2 of a special vehicle (not shown) is attached to the bracket 3 on the side portion of the vehicle body frame 2. A hydraulic cylinder 16 that has shafts 7 and 9 attached to it via a first swing link 6, and the end of the outrigger body 11 is fixed to the other side of the vehicle body frame 2.
The cylinder rod 18 has a shaft 19 attached to the end thereof, and an expandable portion 12 that expands and contracts by an expandable device such as a hydraulic cylinder (not shown) is provided inside the outrigger body 11. The left and right outriggers 10 and 10 are formed approximately symmetrically with respect to the center line of the direction, and the left and right outriggers 10 and 10 are extended and lowered to form the X-shaped outriggers 10 on both sides ( A so-called X-type outrigger) is known.

(Problems to be solved by the invention) However, in the H-shaped outrigger, the float provided at the end of the expansion / contraction portion of the outrigger that expands / contracts in the lateral direction of the vehicle body is provided in a direction perpendicular to the expansion / contraction portion. Since it was to be raised and lowered, the float is stretched after the expansion / contraction part of the outrigger is set to a predetermined width, that is, the vehicle is supported by the outrigger. However, it is necessary to provide a float lifting hydraulic cylinder (or a lifting means instead of the float) at the end of the expansion / contraction part of the outrigger, in addition to the expansion / contraction hydraulic cylinder of the expansion / contraction part of the outrigger. In addition, the float lifting hydraulic cylinder is subjected to the entire load such as the suspended load by the special vehicle including the own weight of the special vehicle. Therefore, it is necessary to make the float lifting hydraulic cylinder and its mounting portion structure fairly strong, which causes a problem that the mounting portion is large and the heavy hole is large.

Further, in the X-type outrigger (see FIG. 3),
The base portion of the outrigger main body 11 is attached to the vehicle body frame 2 via the first swinging link 6 having the shaft 9 attached to the bracket 8 of the base portion.
The shaft 7 is attached to the one side bracket 3, and the end portion of the outrigger body 11 is attached to the other side of the body frame 2 so that the lower side has an angle θ.
A shaft 19 is attached to an end portion of a cylinder rod 18 of a hydraulic cylinder 16 which is fixed so as to open to the right (FIG. 3), and the outrigger main body 11 is swung around its base portion by expansion and contraction of the cylinder rod 18. Since the float 14 at the end of the expandable portion 12 is configured to be lifted and lowered, when pressure oil is supplied to the hydraulic cylinder 16 to lower the cylinder rod 18 obliquely downward to the right, the end portion of the outrigger main body 11, and thus, The outrigger 10A moves down to the right (FIG. 3) side and descends to the solid line position 10 in the figure.

Then, when the outrigger main body 10 moves from the 10A position to the 10th position in this way, a bending load is applied to the cylinder rod 18 and the girinder 16, and in order to prevent such a bending load from being applied to the hydraulic cylinder 16, For example, the outer cylinder (not shown) is fixed to the vehicle body frame 2, the tip of the inner cylinder (not shown) is pin-connected to the outrigger body 11, and the hydraulic cylinder 16 and the cylinder rod 18 are connected.
It has been necessary to take measures such as coupling between the outer cylinder and the inner cylinder that slide with each other, and to apply a bending load to the overlapping portion of the outer cylinder and the inner cylinder.

As described above, in order to prevent the bending load from being applied to the hydraulic cylinder 16, the outer cylinder and the inner cylinder must be provided outside the hydraulic cylinder 16, so that the number of parts increases and the structure becomes complicated. However, there is a problem in that the weight is increased.

Further, due to the extension of the cylinder rod 18 of the hydraulic cylinder 16 that tilts as described above, the end portion of the outrigger main body 11 moves in the same direction, and by extension, the expandable portion 12 inserted in the main body 11 and the float 14 at the end portion. However, in the loaded state, the change in the distance between the two floats 14, 14 affects the stability of the special vehicle, which is not preferable in terms of safety measures.

In view of such problems of the conventional example, the present invention connects the base portion of the outrigger main body to one side of the vehicle body frame via the first swing link, and the arm protruding from the other side portion of the vehicle body frame. The end portion of the hydraulic cylinder is pivotally attached to the center portion, the end portion of the outrigger body is pivotally attached to the cylinder rod end portion of the hydraulic cylinder, and the end portion of the cylinder rod and the end portion of the arm are attached. By connecting via the second swing link, it is intended to provide an outrigger mounting portion structure in a special vehicle in which the outrigger can be smoothly moved up and down with almost no bending stress applied to the cylinder rod. is there.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention connects the base of the outrigger body to one side of the vehicle body frame via the first swing link, An end portion of the hydraulic cylinder is pivotally attached to a central portion of an arm projecting from the other side portion of the vehicle body frame, and an end portion of the outrigger body is pivotally attached to an end portion of a cylinder rod of the hydraulic cylinder. The end of the rod and the end of the arm are connected via a second swing link.

(Operation) Since the present invention has the above-mentioned configuration, it is substantially different from the conventional X-type outrigger in that the outrigger swings around the base side by supplying and discharging the pressure oil to and from the hydraulic cylinder. According to the present invention, the first swinging link having the base portion of the outrigger body attached thereto is connected to the side portion of the vehicle body frame, and the end portion thereof projects from the other side of the vehicle body frame. Since the outrigger body is connected to the arm end through the second swing link, the outrigger main body includes the fixed link configured by the body frame and the arm protruding from the side portion, the first swing link, and the second swing link. It is configured as a so-called four-link link floating link constituted by a link and an outrigger that abuts against this floating link and protrudes from the side portion of the vehicle body frame that constitutes the fixed link. The second swing link swings due to the expansion and contraction of the cylinder rod of the hydraulic cylinder pivotally attached to the center of the arm, and the second swing link swings downward from the lower side of the vehicle body frame or comes close to the outrigger. Raise the float on the end.

(Embodiment) An embodiment of a mounting structure for an outrigger in a special vehicle according to the present invention will be described below with reference to FIGS. 1 and 2. Note that the same names and reference numerals are used for the portions common to the conventional example shown in FIG.

In the figure, 2 is a vehicle body frame of a special vehicle (not shown), 3 is a bracket projecting from the left side (FIG. 1) of the vehicle body frame 2 to the outside, 6 is a first swinging link having one end attached to the bracket 3 by a shaft 7. Reference numeral 10 denotes an outrigger, and the outrigger 10 includes an outrigger main body 11 in which a bracket 8 of a base portion of the outrigger main body 11 is attached to an end portion of the first swing link 7, and a hydraulic cylinder (not shown) inserted into the outrigger main body 11. And a telescopic part 12 which is telescopically operated by the telescopic means of
A float 14 is rotatably attached to the end of the expandable portion 12 so that the shaft 1 can rotate.
Three will be worn. Reference numeral 15 denotes an arm projecting from the other side of the body frame 2 to the outside (right side in FIG. 1) of the body frame 2.
A shaft 17 is attached to the lower part of the hydraulic cylinder 16 at the center of the shaft 5. Reference numeral 18 is a cylinder rod, and an end portion of the cylinder rod 18 is attached to a bracket 20 at an end portion of the outrigger main body 11 by a shaft 1.
9 will be worn. Reference numeral 21 is a second swing link that connects the shaft 19 on the bracket 20 at the end of the outrigger body 11 and the shaft 23 at the end of the arm 15; and 25 is the outrigger body 11
Is a reinforcing plate provided on the outer side of the end of the.

In FIG. 1, only one side of the outrigger 10 provided in the lower portion of the vehicle body frame 2 to form an X shape is moved downward while the outrigger main body 11 is lowered and the expansion / contraction part 12 is extended. 10), the outrigger body 11 is raised 11A, and the expansion / contraction portion 1 thereof is
The thin wire 10A shows a state in which 2 is expanded 12A,
Further, in a state where the outrigger main body 11 is lowered,
A state in which the contraction portion 12 is contracted by half is indicated by a thick two-dot chain line 12
B is shown by B, and the state in which the expansion / contraction part 12 is contracted in the state 11A in which the outrigger main body 11 is raised is shown by the thin double-dotted chain line 12C, but in reality, the outrigger 10 displayed in this way is 1 is provided adjacent to the outrigger 10 on the left side so as to be substantially symmetrical with respect to the line XX in FIG. 1, and when both side outriggers 10 are lowered from the vehicle body 2, both are X-shaped. Is configured.

Next, the operation of this embodiment will be described.

First, in the lower part of the body frame 2, a horizontal solid line position 11
Pressure oil is supplied to a hydraulic cylinder (not shown) in the outrigger body 11 at A to extend the expansion / contraction portion 12 as indicated by the thin solid line position 12 in FIG. 1, and then the pressure oil is supplied to the hydraulic cylinder 16. When the cylinder rod 18 is extended with the outrigger 10, the outrigger 10 moves from the thin solid line position 10A in FIG.
As shown, the float 14A in the thin solid line at the end of the expansion / contraction part 12 becomes the thick solid line 14, and the float 14 in the thick solid line allows the outrigger 10, the vehicle body frame, and the like as in the conventional X-type outrigger. In addition to supporting and levitating the vehicle body of the special vehicle via 2, this embodiment operates as follows.

The base portion of the outrigger body 11 is connected to one side of the vehicle body frame 2 via the first swing link 6, and the end portion of the outrigger body 11 is attached to the end portion of the cylinder rod 18 by a shaft 19 and the shaft 1
The second swinging link 21 causes the shaft 2 to move to the end of the arm 15.
Since the three rods are attached, when the cylinder rod 18 expands and contracts, the attachment portion of the shaft 19 at the end portion of the cylinder rod 18 has the first and second swing links 6,
21 and the outrigger body 11 restrict the same as the so-called four-joint link (however, the fixed link of this four-joint link is the vehicle body skeleton 2 and the arm 15), and the ascending / descending trajectory of the end of the cylinder rod 18 is also the above-mentioned. Bending stress is not generated in the cylinder rod 18 main body and the hydraulic cylinder 16 by being restricted by the first and second swing links 6 and 21.

The lengths of the first and second swing links 6 and 21, the outrigger body 11, the shaft 7 attachment portion between the first swing link 6 base portion and the body frame 2 side portion, and the second swing link 21 base portion. And an interval between the shafts 23 attached to the ends of the arms 15 on the other side of the vehicle body frame 2 are appropriately selected so that the ends of the outrigger main body 11 and the expansion / contraction part 12 inserted in the outrigger main body when the ends are extended. The movement locus in the actual ascending / descending region can be selected to be substantially vertical.

1 shows an example in which the arm 15 extending from the outside of the vehicle body frame 2 extends to the right (FIG. 1) side of the vehicle body frame 2 beyond the shaft 17 attachment portion of the hydraulic cylinder 16; Contrary to the example shown in FIG. 1, the body frame 2
It is also possible to have a structure in which the lower part of the hydraulic cylinder 16 is attached to the shaft 17 at the center part thereof while being configured to extend from the outer part to the left side (the same figure, but not shown) side thereof. In some cases, the shaft 19 at the end of the cylinder rod 18
Since the movement locus of the attachment portion is restricted by the second swing link 21 so as to form a convex arc toward the outside of the vehicle body frame 2, the extension of the cylinder rod 18 causes the second swing link 21 to move. A compressive force will act, and in this case, the cylinder rod is made thick so as to withstand the compressive force acting on the second swing link.

(Effect of the Invention) Since the present invention has the above-described structure and operates, the supply and discharge of the pressure oil to and from the hydraulic cylinder causes the outrigger to be installed in the same manner as the conventional outrigger mounting portion structure, and thus the special vehicle. In addition to being able to move up and down and support, the following unique effects are obtained.

(1) The outrigger body is movably supported by the first and second swing links whose bases are axially attached to both side portions of the body frame, and the end portions of the outrigger body and the second swing link are connected to each other. When the outrigger is raised and lowered by supplying and discharging pressure oil to and from the hydraulic cylinder, the cylinder is attached to the end of the cylinder rod of the hydraulic cylinder that is attached to the center of the arm protruding from the side of the body frame. No bending stress is generated in the rod, and therefore, there is no need to construct a plug for the outer cylinder and inner cylinder on the outside of the hydraulic cylinder and cylinder rod, so the structure of the same part does not become complicated and the number of parts and There is no fear of increasing the weight, and it can be configured as a simple and lightweight one.

(2) When pressure oil is supplied to the hydraulic cylinder to extend the cylinder rod and the outrigger is completely set in the working state, the force applied to the connecting portion between the arm and the second swing link and the connecting of the arm cylinder Since the direction of the force applied to the part is opposite to that of the force applied to the part, a large bending moment is not applied to the attachment part of the arm to the vehicle body frame side part, and the attachment part can be configured simply and lightweight.

If the hydraulic cylinder is supported by the central portion of the arm projecting from the side portion of the vehicle body frame to the outside of the vehicle body, the arm end portion and the cylinder rod end portion are connected to each other in a state where the cylinder rod is extended. Since a tensile force acts on the second swing link, the link can be designed and manufactured without considering the buckling problem of the second swing link.

Since the outrigger main body is supported by the first and second swing links, the float at the end of the expansion / contraction portion is moved up and down substantially along the vertical line by selecting the first swing link to be relatively short. The structure can be designed easily.

[Brief description of drawings]

FIG. 1 is a side view showing an essential part of an embodiment of an outrigger mounting part structure for a special vehicle according to the present invention, FIG. 2 is an explanatory view of its operation, and FIG. 3 is an essential part of a conventional example. FIG. 2 ... Body frame, 3 ... Bracket, 6 ... First swing link, 7, 9, 17 ... Shaft, 10 ... Outrigger, 11 ... Outrigger body, 12 ... Telescopic part, 14 ... Float , 15 ... Arm, 16 ... Hydraulic cylinder, 19, 23 ... Shaft, 18 ... Cylinder rod, 21 ... Second swing link.

Claims (2)

[Scope of utility model registration request] 1. A base portion of an outrigger body is connected to one side of a vehicle body frame via a first swing link, and an end portion of a hydraulic cylinder is attached to a central portion of an arm protruding from the other side portion of the vehicle body frame. The end of the outrigger body is axially attached to the end of the cylinder rod of the hydraulic cylinder, and the end of the cylinder rod and the end of the arm are connected via a second swing link. An outrigger mounting structure for a special vehicle characterized by the above. 2. A utility model registration special claim according to claim 1, wherein said hydraulic cylinder is supported by a central portion of said arm projecting from a side portion of said body frame to the outside of the vehicle body. Outrigger mounting structure for vehicles.