JP2004043046A - Turntable supporting mechanism of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turntable supporting mechanism to improve rigidity of a sub-frame to support a turntable without increasing weight of the vehicle. <P>SOLUTION: The turntable supporting mechanism has a plurality of reinforcing members 70-81 arranged in the sub-frame 18 constituted by having an upper plate part 19 and a lower plate part 23 arranged vertically with a specified interval and extending roughly in the horizontal direction before and behind and a pair of side plate parts 27 vertically connecting these left and right both end parts. The reinforcing members 70-81 are arranged in a space part 20a in the sub-frame on the outside in the diametrical direction of a hole part 20 formed on the upper plate part 19 and in which the turntable is mounted free to turn and revolve and vertically extend, the upper end part is connected to the upper plate part 19 and the lower end part is connected to the lower plate part 23, and the space part 20a is arranged to be partitioned in a cell shape by the upper plate part 19, the lower plate part 23 and the reinforcing members 70-81. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a turntable support mechanism for a work vehicle, and more particularly, to a turntable support for a work vehicle having a turntable rotatably mounted on a hollow support main body mounted on a chassis frame. Regarding the mechanism.
[0002]
[Prior art]
Such a work vehicle is generally configured based on a truck vehicle that can run with wheels rotatably disposed in front and rear of a vehicle body. This truck vehicle has a pair of chassis frames extending back and forth at predetermined intervals in the left-right direction, and on the pair of chassis frames, upper plate portions opposed to each other with a predetermined interval vertically and A hollow support body having a lower plate portion and side plate portions connecting these ends, a hollow support body extending in the front-rear direction is attached, and a turntable is attached to a hole formed in the upper plate portion so as to be pivotable. There is.
[0003]
The upper plate portion forming such a hole is provided with a cantilevered state in which a concentrated load (own weight of the swivel table) acts on the distal end portion of the upper plate portion when the hole side is a tip. When the swivel is attached to the upper plate, the tip of the upper plate bends downward and the support of the swivel becomes unstable. Therefore, in order to stabilize the support of the swivel table, as shown in FIG. 6, the support is extended vertically in a space located radially outside the hole and formed between the upper plate and the lower plate. In some cases, a plate-like reinforcing member having an upper end connected to the upper plate and a lower end connected to the lower plate is provided, and the front surface of the reinforcing member is disposed in a state facing the center O side of the hole. In this case, the reinforcing member is attached to a position close to the hole so that the bending of the upper end is as small as possible.
[0004]
[Problems to be solved by the invention]
However, even if the reinforcing member is mounted at a position close to the hole, if the thickness of the reinforcing member is thin, the weight of the swivel attached to the tip of the upper plate acts as a bending moment on the reinforcing member to reinforce the reinforcing member. There is a fear that the member is deformed. Therefore, if the thickness of the reinforcing member is increased, the deformation of the reinforcing member is reduced, and the rigidity of the upper plate portion supporting the swivel and the supporting body portion including the reinforcing member can be improved, but the vehicle weight increases. Problem arises.
[0005]
The present invention has been made in view of such a problem, and provides a turntable support mechanism for a working vehicle that can increase the rigidity of a support body that supports the turntable without increasing the weight of the vehicle. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a turntable support mechanism for a working vehicle according to the present invention is mounted on a chassis having a chassis frame extending in the front-rear direction (for example, the truck vehicle 2 in the embodiment) and a chassis frame of the vehicle body, A hollow support body (for example, the subframe 18 in the embodiment) having at least an upper plate portion and a lower plate portion opposed to each other with a predetermined interval therebetween and extending forward and backward; A swivel support mechanism for a working vehicle (for example, the aerial work vehicle 1 in the embodiment) having a swivel table rotatably mounted in a hole formed in a plate portion, the swivel support mechanism comprising: A plurality of reinforcing members are arranged in the space portion in the radially outer side of the support main body portion and extend vertically, the upper end portion is connected to the upper plate portion, and the lower end portion is connected to the lower plate portion. During turning of the swivel support mechanism In longitudinal cross section that cuts one vertical plane containing the upper plate portion, the space portion by the lower plate portion and the reinforcing member are arranged to be partitioned into cellular.
[0007]
According to the swivel support mechanism of the above configuration, in a longitudinal sectional view of the support body, the reinforcing member is disposed such that the space is partitioned into a cell shape by the upper plate, the lower plate, and the reinforcing member, The weight of the swivel base can be distributed to the members that partition the swivel base into cells, and the rigidity of the support body that supports the swivel base can be improved. Further, the support main body according to the present invention is configured such that the upper plate portion is cantilevered at the upper end portion of the reinforcing member by being partitioned into a cell shape, and the swivel table is placed on the upper plate portion. As compared with the support main body portion, a desired rigidity can be obtained even when the plate thickness of the reinforcing member is reduced. As a result, the thickness of the reinforcing member can be reduced, and an increase in vehicle weight due to an increase in the thickness of the reinforcing member can be prevented.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. A swivel support mechanism according to the present invention includes a boom configured to be capable of swiveling and raising and lowering on a vehicle body and configured to be extendable and contractable, and a worktable attached to a tip of the boom so as to swing up and down. Before use of the swivel support mechanism, the aerial work vehicle equipped with the swivel support mechanism will be described.
[0009]
As shown in FIG. 1, the aerial work vehicle 1 is configured based on a truck vehicle 2 that can travel. The truck vehicle 2 includes a pair of chassis frames 3 extending forward and backward at predetermined intervals in the left-right direction, and a pair of front wheels 5 is rotatably disposed on both left and right sides on the front side of the chassis frame 3. A pair of rear wheels 7 are rotatably driven on both left and right sides of the vehicle to be able to travel on a road, and a driving cabin 9 is provided at a front portion.
[0010]
A sub-frame 18 extending forward and backward is mounted on a pair of chassis frames 3 projecting rearward from the driving cabin 9 toward the vehicle. As shown in FIG. 5B, the sub-frame 18 has a hollow interior and a rectangular cross-sectional shape, and is opposed to each other at a predetermined interval vertically and extends substantially horizontally in the front-rear direction. It comprises a portion 19, a lower plate portion 23, and a pair of side plate portions 27 connecting the left and right ends thereof up and down. As shown in FIG. 2A, front jacks 31, 32 and rear jacks 35, 36, which are configured to be able to extend and protrude vertically and horizontally in the vehicle, are disposed at the front and rear left and right ends of the sub-frame 18, respectively. ing.
[0011]
A circular hole 20 is formed at the center of the upper plate 19 on the vehicle front side with respect to the rear jacks 35 and 36. A swivel table 40 shown in FIG. 3 is attached to the hole 20 so as to be horizontally swivelable. Specifically, as shown in FIG. 3, an annular base ring 41 is attached to the upper plate 19 radially outside the hole 20 by a fastening jig such as a bolt (not shown). On the outer side in the direction, an annular turning race 43 is attached so as to be rotatable in the circumferential direction with respect to the base ring 41. A swivel 40 is attached to the upper part of the swivel race 43 by a fastening jig such as a bolt (not shown). For this reason, the swivel table 40 is freely swingable with respect to the base ring 41.
[0012]
The turning race 43 has a gear 43a formed on the outer peripheral surface thereof. A driving gear (not shown) provided on the upper plate 19 meshes with the gear 43a, and the turning race 43 is rotated by the rotation driving of the driving gear. Then, the swivel 40 is swung. As shown in FIG. 4, the swivel base 40 has a disc-shaped flange 45 attached to the swivel race 43 shown in FIG. 3, and a swivel body 47 projecting upward from the upper surface of the flange 45. It is configured. The revolving main body 47 has a pair of protruding portions 47a that are arranged facing each other at a predetermined interval in the left-right direction.
[0013]
As shown in FIG. 1, a boom 50 pivotally connected to the base is vertically mounted between the upper ends of the pair of protrusions 47a, 47a. The boom 50 is configured to be telescopically movable by a telescopic cylinder (not shown) built in a nested combination of a base end boom 50a, an intermediate boom 50b, and a distal end boom 50c. The boom 50 is raised and lowered by the lifting cylinder 53.
[0014]
A vertical post 55 is attached to the tip of the boom 50 so as to be able to swing up and down. The vertical post 55 is moved by a leveling device (not shown) arranged between the vertical post 55 and the tip of the boom 50 regardless of the angle of the boom 50. It is held vertically. A horizontal arm 57 is attached to the vertical post 55 so as to be able to move horizontally, and a worktable 59 is attached to the tip of the horizontal arm 57.
[0015]
As shown in FIG. 5A, a swivel support mechanism according to the present invention is provided inside the sub-frame 18 of the aerial work vehicle 1 configured as described above. The swivel support mechanism has a plurality of reinforcing members 70 to 81. FIG. 5 shows an example of the arrangement of the reinforcing members 70 to 81. The reinforcing members 70 to 81 are plate-like members, are disposed in the space 20a in the subframe 18 radially outside the hole 20 and extend vertically, the upper end is connected to the upper plate 19, and the lower end is the lower plate. It is connected to the unit 23. As shown in FIG. 5B, the reinforcing members 71 and 73 among the reinforcing members 70 to 81 are, as viewed in a vertical cross section of the subframe 18, the upper plate 19, the lower plate 23, and the reinforcing members 71 and 73. Are arranged so as to partition the space 20a into a cell shape.
[0016]
The reinforcing members 70 to 81 will be described in more detail. As shown in FIG. 5A, four reinforcing members 70 to 73 are provided between the upper plate portion 19 and the lower plate portion 23 in the vicinity of the hole portion 20 in the radial outside. Are arranged in a rectangular shape in a plan view in the space portion 20a, and reinforcing members 74 to 77 extending in a diagonally outward direction with one ends connected to respective ends of the four reinforcing members 71 to 73 are provided. . Further, the four reinforcing members 70 to 73 disposed in a rectangular shape are disposed substantially vertically to the above-described reinforcing members 74 to 77 extending in the obliquely outward direction and extend adjacent to the vehicle in the left-right direction. Four reinforcing members 78 to 81 having a substantially triangular shape in plan view are provided with the reinforcing members.
[0017]
By arranging the plurality of reinforcing members 70 to 81 in this manner, similarly to the case shown in FIG. 5B, the space 20a located radially outside the hole 20 is partitioned into cells, and A so-called ramen-structured cellular structure portion 83 including the plate portion 19, the lower plate portion 23, and the reinforcing members 70 to 81 is formed. Here, the swivel 40 shown in FIG. 3 is supported by the lower plate 23 via the upper plate 19, the side plate 27, and the reinforcing members 70 to 73 of the cellular structure portion 83. The partitioning of the space 20a into a cell shape refers to, for example, a state in which a plurality of small chambers are formed in the space 20a like a beehive.
[0018]
For this reason, the cellular structure portion 83 shown in FIG. 5B distributes the weight of the swivel table 40 shown in FIG. 3 attached to the hole 20 to the reinforcing members 70 to 73, the upper plate portion 19 and the side plate portion 27. Can be supported. As a result, the rigidity of the cellular structure portion 83 can be made higher than the rigidity of the support portion 91 that cantileverly supports the turntable 40 by the upper plate 19 and the reinforcing member 90 shown in FIG.
[0019]
For example, when the plate thickness of the upper plate 19 and the lower plate 23 shown in FIG. 5B is set to be the same as the plate thickness of the upper plate 19 and the lower plate 23 shown in FIG. Even if the thickness of the reinforcing members 71 and 73 shown in FIG. 5B is smaller than the thickness of the reinforcing member 90 shown in FIG. 6B, the rigidity of the cellular structure portion 83 shown in FIG. The rigidity of the supporting portion 91 shown in FIG. For this reason, the weight of the entire portion supporting the turntable 40 can be reduced, and an increase in vehicle weight can be suppressed.
[0020]
【The invention's effect】
As described above, according to the swivel support mechanism of the present invention, in the longitudinal sectional view of the support main body, the upper plate, the lower plate, and the reinforcing member such that the space is partitioned into cells by the reinforcing member. By arranging, the own weight of the swivel base can be distributed to the members that partition the cell into a cell shape, and the rigidity of the support body that supports the swivel base can be improved. Further, the support main body according to the present invention is configured such that the upper plate portion is cantilevered at the upper end portion of the reinforcing member by being partitioned into a cell shape, and the swivel table is placed on the upper plate portion. As compared with the support main body portion, a desired rigidity can be obtained even when the plate thickness of the reinforcing member is reduced. As a result, the thickness of the reinforcing member can be reduced, and an increase in vehicle weight due to an increase in the thickness of the reinforcing member can be prevented.
[Brief description of the drawings]
FIG. 1 is a left side view of an aerial work vehicle equipped with a swivel support mechanism according to an embodiment of the present invention.
FIGS. 2A and 2B show a subframe mounted on a chassis frame according to an embodiment of the present invention. FIG. 2A is a plan view of the subframe, and FIG. 2B is a side view of the subframe. .
FIG. 3 is a perspective view of a swivel table attached to the subframe according to the embodiment of the present invention.
FIG. 4 is a perspective view of a swivel according to the embodiment of the present invention.
5A and 5B show a swivel support mechanism according to an embodiment of the present invention. FIG. 5A is a plan view of the swivel support mechanism, and FIG. FIG. 3 shows a cross-sectional view of a portion corresponding to the arrow.
6A and 6B show a conventional swivel support mechanism, and FIG. 6A is a plan view of the swivel support mechanism, and FIG. 6B is a view corresponding to a view taken along the line VI-VI in FIG. FIG.
[Explanation of symbols]
1 Aerial work vehicles (work vehicles)
2 Truck vehicle (body)
3 Chassis frame 18 Sub frame (support body)
19 upper plate part 20 hole part 23 lower plate part 40 turntable 70-81 reinforcing member

Claims (1)

A vehicle body having a chassis frame extending forward and backward,
A hollow support main body attached to the chassis frame of the vehicle body and having at least an upper plate portion and a lower plate portion opposed to each other with a predetermined interval above and below and extending back and forth,
A swivel support mechanism for a working vehicle, comprising: a swivel rotatably attached to a hole formed in the upper plate portion of the support main body;
A plurality of reinforcing members are disposed in a space in the support body portion radially outside the hole and extend vertically, and an upper end is connected to the upper plate and a lower end is connected to the lower plate,
In the vertical cross-sectional view, in which the reinforcing member is cut along one vertical plane including the turning center of the swivel support mechanism of the support main body, the space is formed by the upper plate, the lower plate, and the reinforcing member. A turntable support mechanism for a working vehicle, wherein the turntable support mechanism is arranged so as to be partitioned in a shape.

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