JPH02106596A - Mount part structure for outrigger for special vehicle - Google Patents

Abstract

PURPOSE:To prevent wear of the shaft support part of a hydraulic cylinder rod by a method wherein the base part of the hydraulic cylinder is pivotally mounted to the end part of a second bracket, and the base part of a second wing link is pivotally mounted to the lower part of the central part of the second bracket. CONSTITUTION:A first swing link 4 has a base part pivotally mounted to the central part of a second bracket 21 on the one side of a car body frame 1 and a lower end pivotally mounted to the base part of an outrigger 10 body. A second swing link 23 has a base part pivotally mounted to the lower part of the central part of the second bracket 21 on the side of the car body frame 1 and a lower end pivotally mounted to the central part of the outrigger 10. A hydraulic cylinder 16 is situated in a state to be inclined toward the car body frame 1 side, and the inclination angle thereof is hardly changed through expansion and contraction of a cylinder block. This constitution prevents rotation of a shaft 19 of a hydraulic cylinder rod 18, and enables prevention of wear of a support part.

Description

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

(Prior Art) The conventional outrigger attachment structure for special vehicles such as crane trucks is such that the outrigger main body provided at the front and rear of the vehicle body frame of the special vehicle has a telescopic section that expands and contracts in the lateral direction of the vehicle body frame. An outrigger equipped with a float that moves up and down in the stacking direction at the end of the extendable part is installed approximately symmetrically on the left and right with respect to the longitudinal centerline of the vehicle body, which is known as an "rH type outrigger". It is being

Further, as shown in FIG. 3, the base of the outrigger 10 body 11 disposed below the body frame 1 of a special vehicle (not shown) is attached to the first swing link 4 on the first bracket 2 on the side of the body frame 1. The shaft 19 is attached to the end of the cylinder rod 18 of the hydraulic cylinder 16 whose end is fixed to the other side of the vehicle body frame 1, and the shaft 19 is attached to the inside of the outrigger body 11. A telescoping section 12 is provided that is telescoping by a telescoping device such as a hydraulic cylinder (not shown), and such an outrigger 10 is aligned with the longitudinal centerline 0-O of the vehicle body frame 2.
The left and right outriggers 10.10
are placed in the retracted position in the same horizontal plane as shown by the two-dot chain line 10 in FIG. (left side in Fig. 3) and lower it as shown by the solid line 10A.

An X-shaped outrigger formed by the outriggers 10 and 10 on both sides after rotation is known as an "X-shaped outrigger" (see, for example, Japanese Utility Model Application Publication No. 59-193760).

In addition, as shown in FIG.
The cylinder 16 has shafts 5 and 19 supported on the base and end portions of the outrigger main body 11 via the first swing link 4 and second swing link 23 that have been attached, and the shaft 17 supported on the base of the arm 15. The applicant of the present invention has already proposed a structure in which the end of the cylinder rod 18 is attached to the end of the outrigger main body 11 by a shaft 19 so that no bending moment is applied to the cylinder rod 18 ( (Refer to Utility Application No. 62-200028) (Problem to be Solved by the Invention) However, in the H-type outrigger, the extendable portion of the outrigger provided in the lateral direction of the vehicle body frame is extended in the lateral direction of the vehicle body frame. By raising and lowering the floats at the ends of the floats to a predetermined width, the vehicle body can be raised and lowered without changing the spacing between the floats on both sides of the vehicle body. The lifting cylinder (or an alternative lifting means),
It is necessary to provide it at the end of the extensible part.

Since this cylinder for lifting and lowering the float is subject to the full load of the special vehicle's own weight and the suspended load, the structure of the hydraulic cylinder for lifting and lowering the float and its mounting part must be constructed quite strongly, and the weight of the mounting part The problem was that it became large.

In addition, in the X-type outrigger shown in FIG. 3, the base of the outrigger body 11 is connected to the
The shaft 3 is attached to the first bracket 2 on the L- side of the vehicle body frame, and the end of the outrigger body 11 is attached to the vehicle body frame 1.
A shaft 19A is attached to the end of the cylinder rod 18 of a hydraulic cylinder 16 which is fixed on the other side so that its lower side opens outward at an angle O to the right (Fig. 3), and the outrigger body 11 is attached to the end of the cylinder rod 18 by the expansion and contraction of the cylinder rod 18. Since it is configured to swing around the base and raise and lower the float 14 at the end of the telescopic part 12, when pressure oil is sent to the hydraulic cylinder 1G, the cylinder rod 18 descends diagonally to the lower right, and the outrigger 1
From the two-dot chain line position 10 with 0 stored, diagonally lower right side (same figure)
At this time, a bending load is applied to the cylinder rod 18 and the cylinder 16, which causes
There is a problem in that misalignment of the axes between the hydraulic cylinder 16 and the piston on the cylinder rod 18 may cause oil leakage or the like.

Although the bending load generated on the inclined hydraulic cylinder 16 and cylinder rod 18 as shown in FIG. 3 can be removed by providing guide tubes on the outside of these cylinders that can slide against each other, this would complicate the structure. At the same time, there was a problem in that the number of parts and the weight increased.

The problem of the occurrence of bending loads on the hydraulic cylinder 16 and the cylinder rod 18 can be solved by attaching the outrigger main body 11 to the first shaft with its base mounted on both sides of the vehicle body frame 1, as shown in FIG. A hydraulic cylinder 16 and a cylinder rod 18 are attached to the ends of the swinging link 4 and the second swinging link 23 with a shaft 5°19, and the space between them is configured in a so-called four-bar link shape, thereby raising and lowering the outrigger main body 11. Although it is possible to prevent the occurrence of bending loads on the cylinder 16 and cylinder rod 18 without taking measures such as providing a pair of guide tubes that slidably engage with each other,
In this case, the hydraulic cylinder 16 was attached to the base of the arm 15 by a shaft 17, so when the cylinder rod 18 was contracted, the hydraulic cylinder 16 had a substantially vertical shape, and when the cylinder rod 18 was extended, the cylinder 16 was The axis 1
The cylinder rod 18 rotates by a considerable angle β counterclockwise with respect to the vertical line passing through 7, and becomes the state shown by the solid line in FIG. 4 (lowering position of the outrigger 10). There is a problem in that the bearing portion of the shaft 19, which receives the full load of such a special vehicle, wears out.

This invention provides a first
and a hydraulic cylinder is pivotally attached to an end of a second bracket that supports the outrigger main body via a second swing link and extends from the support shaft of the second swing link base to the outside of the vehicle body frame, and the cylinder rod thereof By pivoting the end portion to the end portion of the outrigger main body, it is intended to provide an outrigger mounting structure for a special vehicle that does not have the above-mentioned problems.

(Means for Solving the Problems) In order to solve the problems of the conventional example as described above, the present invention provides a first swing link and a second swing link whose bases are pivoted to one side and the other side of the vehicle body frame, respectively. The base and center portions of the outrigger main body are respectively pivoted to the lower ends of the swing link, and a second bracket is provided on the other side of the vehicle body frame and extends outward from the support shaft of the second swing link base. A hydraulic cylinder is pivotally supported at the end, and the cylinder rod of the hydraulic cylinder is pivotally attached to the end of the outrigger main body.

(Function) Since the present invention has the above-described configuration, by supplying and discharging pressure oil to the hydraulic cylinder and expanding and contracting the cylinder rod, the outrigger is swung around its base side and the vehicle body frame is raised and lowered. In doing so, the base and center portion of the outrigger main body are supported by first and second swing links whose bases are pivoted on one side and the other side of the vehicle body frame, and the base and the center portion of the outrigger body are supported on the other side of the vehicle body frame. The end of the cylinder rod of the cylinder whose base is pivoted to the end of the provided second bracket is pivoted to the end of the outrigger main body, and the top of the cylinder is provided so as to be inclined toward the vehicle body frame side. As a result, the hydraulic cylinder is supported at the end of the second bracket, which is located outside the support shaft of the second swing link base, so that its top part is inclined toward the vehicle body frame, so that when the cylinder rod expands and contracts, The outrigger moves up and down by extending or contracting the cylinder rod without changing its direction.

(Example) Hereinafter, an example of the structure of the attachment part for the ARA 1-RIGA in a special vehicle according to the present invention will be described with reference to FIGS. 1 and 2. Note that the same names and symbols are used for parts common to the conventional example shown in FIG. 3 and the one shown in FIG.

In FIGS. 1 and 2, 1 is a body frame of a special vehicle such as a crane truck (not shown), 2 is a first bracket provided on the left side (FIG. 1) of the body frame 1, and 4 is a base of a special vehicle (not shown). 1 A first swing link having a shaft 3 attached to a bracket 2; 5 a shaft rotatably connecting the first swing link 4 and the base of the main body 11 of the outrigger 10; 12 a shaft capable of extending and contracting inside the outrigger main body 11; 21 is a second bracket that is provided on the other side of the vehicle body frame 1 and protrudes outward from the first bracket 2; The cylinder 18 is a cylinder rod, and the end of the cylinder rod 18 is attached to the end of the outrigger body 11 (on the right side in FIG. 1) by a shaft 19, and this hydraulic cylinder 16 is connected to the end of the second bracket 21 at the base thereof. Angle γ with respect to the vertical line passing through the axis 17 point of
It is provided so as to be inclined toward the vehicle body frame 2 (leftward in FIG. 2). Reference numeral 23 denotes a second swing link whose base portion is rotatably attached to a shaft 22 at the lower center of the second bracket 21;
The lower end of the swing link 23 is attached to a shaft 24 at the center of the outrigger body 11. Reference numerals 26 and 28 are cylinders and cylinder rods for extending and contracting the extendable part 12 of the outrigger 10 with respect to the outrigger main body 11, and shafts 27 and 29 are attached to the base of the main body 11 and the end of the extendable part 12, respectively.

In FIG. 1, the state in which only one side of the outrigger 10 provided in an X shape at the bottom of the vehicle body frame 1 is lowered and its telescopic portion 12 is extended is indicated by a thick solid line. 10A, and in this state,
The state in which the stretchable part 12A is slightly contracted is indicated by the two-dot chain line 12B.
and also.

The state in which the outrigger 10 is raised and the telescopic part 12 is extended is shown by the thin solid line 10, and the state in which the telescopic part 12 is contracted in this raised position and the float 14 is raised 14C (storage position) is shown by two points. It is shown by a chain line 12C.

Note that such an outrigger 10 is placed on the left side of the vehicle body frame 1 so that it is approximately symmetrical with respect to the center line ○-0 of the vehicle body frame 1 in the left-right direction.

It is provided adjacent to the outrigger 10.

Next, the operation of this embodiment will be explained.

First, at the bottom of the vehicle body frame 1, a horizontal thin solid line 10
Pressure oil is sent to the hydraulic cylinder 26 in the outrigger body 11 located at When oil is supplied and the cylinder rod 18 is extended, the outrigger 10 descends from the thin solid line position 10 to the thick solid line position 10A, and the float 14 at the end of the extendable portion 12 moves from the thin solid line position 14 to the thick solid line position. 14A, and with this thick solid line float 14A, the outrigger 10° body frame 1
Besides levitating special vehicles through, it works as follows.

The base of the outrigger main body 11 is attached to the first bracket 2 on the side of the vehicle body frame 1 via the first swing link 4, and the central upper part of the outrigger body 11 connects the base to the second bracket on the other side of the body frame 1. A shaft 22 is attached to the lower center of the second bracket 21 , a shaft 24 is attached to the lower end of the second swing link 23 , and a shaft 17 is attached to the end of the second bracket 21 where the base of the hydraulic cylinder 16 extends largely toward the other side of the vehicle body frame 1 . Since the cylinder rod 18 is extended, the first bracket 2, the vehicle body frame 1, and the second bracket 21 are fixed, and the first swing link 4 and the second swing link 23 are set as a swing link and an outrigger link, respectively. The so-called "4" with the main body 11 as a floating link
The second bracket 21, which is the fixed joint part of the four-bar link, and the outrigger main body 11, which is the floating joint part, are expanded and contracted by the hydraulic cylinder 16 and the cylinder rod 18. The shafts 17 and 19 of these hydraulic cylinders 16 and cylinder rods 18 are
Restricted by each member forming the four-bar link shape, the shaft 19 attachment portion at the lower end of the cylinder blond 18 also follows an upward and downward trajectory restricted by the first and second swing links 4.23, etc. In this case, the cylinder rod 18 and the hydraulic cylinder 16 are not subjected to any bending load, and the alignment 1-
Riga 10 moves up and down.

Also, the first and second swing links 4.23. The length of the outrigger main body 11, the attachment point of the shaft 3 between the base of the first swing link 4 and the first bracket 2 on the side of the vehicle body frame 1, the base of the second swing link 23 and the shaft 3 on the other side of the vehicle body frame 1. 2 bracket 2
By appropriately selecting the distance between the center lower part of the outrigger body 11 and the attachment part of the shaft 22, the actual elevation range of the end of the outrigger body 11 and the extensible part 12 inserted into the outrigger body 11 can be adjusted. The movement trajectory in is approximately the button straight line D-D
In this embodiment, the second
An example in which the lower end of the swing link 23 is attached to the shaft 24 at the upper center of the outrigger body 11 as shown in FIG. 1.2, and the base of the hydraulic cylinder 16 is attached to the shaft 17 at the outer side of the second bracket 21 However, with this configuration, the top of the cylinder 16 is inclined toward the vehicle body frame 1 (the first
When the float 14 at the end of the telescopic portion 12 of the outrigger 10 is moved up and down along the vertical line D-D, the movement is performed without changing the inclination of the cylinder 16 in the axial direction.

(Effects of the Invention) Since the present invention has the above-described structure and operates, the outrigger can be connected to the outrigger in the same way as the conventional 7 outrigger mounting structure by supplying and discharging pressure oil to the hydraulic cylinder, and therefore the 5 special vehicle. In addition to being able to raise, lower, and support the ground, the following unique effects can be obtained.

(1) The base of the hydraulic cylinder is pivoted to the end of the second bracket protruding from the side of the vehicle body frame, and the base of the second swing link is located closer to the vehicle body frame than the pivot attachment portion of the hydraulic cylinder. Since it is pivoted to the lower center of the second bracket, the top of the hydraulic cylinder can be installed with the top inclined towards the vehicle frame, and therefore the cylinder rod can be expanded and contracted without changing the inclination angle of the hydraulic cylinder. We can provide what we can.

(2) Since the top of the hydraulic cylinder is inclined toward the vehicle body frame and the cylinder rod can be expanded and contracted without changing the direction of inclination of the hydraulic cylinder, there is no risk of wear on the support of the hydraulic cylinder.

(3) The outrigger main body is movably supported by first and second swing links whose bases are pivoted to brackets on both sides of the vehicle body frame, and the center part of the outrigger main body and the end of the second swing link Since it is pivoted and supported in a four-bar link shape, when the outrigger is raised and lowered by supplying and discharging pressure oil to the hydraulic cylinder, bending stress is not generated on the cylinder rod, and therefore the outside of the hydraulic cylinder and cylinder rod is There is no need to take measures that complicate the structure, such as providing an outer cylinder and an inner cylinder, and there is no risk of an increase in the number of parts or weight, and the structure can be simple and lightweight.

(4) Since the outrigger main body is supported by the first and second swing links, by selecting the first swing link to be relatively short, the float at the end of the extendable part can be raised and lowered approximately along the button straight line. Let's do it 111! structure can be designed easily.

(5) When the cylinder rod of the hydraulic cylinder is contracted, the second swing link rotates toward the center of the vehicle body frame and is arranged horizontally, so the outrigger support structure can be made compact. It can be configured as follows.

(6) The mounting shaft of the second swing link base to the side part of the vehicle body frame 1 is arranged inside the mounting shaft of the hydraulic cylinder to the rotation part, which is different from conventional similar devices (for example, see FIG. 4). Since the positions of the mounting shafts of the second swing link and the hydraulic cylinder with respect to the side of the vehicle body frame are arranged in an inverse relationship, the mounting shaft of the hydraulic cylinder is located on the float side compared to the conventional mounting shaft, and the hydraulic pressure for the same load is The supporting force of the cylinder can be smaller than that of the conventional example, and as a result, the strength of the hydraulic cylinder, especially its cylinder rod, can be made smaller than that of the conventional example.

18...Cylinder rod, 21...Second bracket, 23...Second swing link.

Claims (2)

[Claims] (1) The base and center portions of the outrigger body are pivoted to the lower ends of a first swing link and a second swing link whose bases are pivoted to one side and the other side of the vehicle body frame, respectively, and the vehicle body A hydraulic cylinder is supported on an end of a second bracket provided on the other side of the frame and extending outward from the support shaft of the second swing link base, and a cylinder rod of the hydraulic cylinder is supported on an end of the outrigger body. Outrigger mounting structure for special vehicles characterized by the following features: (2) When the cylinder rod of the hydraulic cylinder is contracted,
2. The outrigger mounting structure for a special vehicle according to claim 1, wherein the second swing link is arranged so as to rotate toward the center of the vehicle body frame and form a horizontal shape.