JP4195247B2 - Rotating platform support mechanism for work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swivel support mechanism for a work vehicle, and more particularly, to a swivel support for a work vehicle having a swivel attached to a hollow support body attached to a chassis frame so as to be turnable. Regarding the mechanism.
[0002]
[Prior art]
Such a working vehicle is generally configured based on a truck vehicle having wheels that are rotatably disposed on the front and rear of the vehicle body. This truck vehicle has a pair of chassis frames extending in the front-rear direction with a predetermined interval in the left-right direction. On the pair of chassis frames, an upper plate portion disposed opposite to each other with a predetermined interval above and below, and A hollow support main body portion that has a lower plate portion and a side plate portion that connects these end portions and extends in the front-rear direction is attached, and a swivel base is attached to a hole formed in the upper plate portion so as to be capable of swiveling. There is.
[0003]
The upper plate portion that forms such a hole portion is a side plate that is cantilevered so that a concentrated load (self-weight of the swivel base) acts on the distal end portion of the upper plate portion when the hole portion side is the distal end portion. When the swivel base is attached to the upper plate portion, the tip end portion of the upper plate portion bends downward and the swivel support becomes unstable. Therefore, in order to stabilize the support of the swivel base, as shown in FIG. 6, it extends vertically to a space portion that is located radially outside the hole portion and is formed between the upper and lower portions of the upper plate portion and the lower plate portion. In some cases, a plate-shaped reinforcing member having an upper end connected to the upper plate portion and a lower end portion connected to the lower plate portion is provided, and the front surface of the reinforcing member is arranged in a state of being directed toward the center O side of the hole portion. In this case, the reinforcing member is attached at 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 attached at a position close to the hole, if the thickness of the reinforcing member is thin, the weight of the swivel mounted on the tip of the upper plate acts as a bending moment on the reinforcing member to reinforce it. There is a risk that the member is deformed. Therefore, if the plate thickness of the reinforcing member is increased, the deformation of the reinforcing member is reduced, and the rigidity of the support main body portion including the upper plate portion and the reinforcing member for supporting the swivel 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 swivel support mechanism for a working vehicle that can increase the rigidity of a support body portion that supports the swivel without increasing the vehicle weight. The purpose is to provide.
[0006]
In order to solve the above problems, a swivel support mechanism for a working vehicle according to the present invention is attached to a vehicle body (for example, a truck vehicle 2 in the embodiment) having a chassis frame extending in the front-rear direction, and the chassis frame of the vehicle body. A hollow support main body (for example, subframe 18 in the embodiment) that has at least an upper plate and a lower plate that are opposed to each other with a predetermined interval in the vertical direction and extends in the front-rear direction. A swivel support mechanism for a working vehicle (for example, an aerial work vehicle 1 in the embodiment) having a swivel that is pivotally attached to a hole formed in a plate part. A plurality of reinforcing members which are arranged in a space portion in the support body portion on the radially outer side and extend vertically, and whose upper end portion is connected to the upper plate portion and whose lower end portion is connected to the lower plate portion. Reinforcement member (for example, implementation The reinforcing members 70 to 73) in the state, the second reinforcing members (for example, the reinforcing members 74 to 77 in the embodiment), and the third reinforcing members (for example, the reinforcing members 78 to 81 in the embodiment), and the first The reinforcing member is disposed in a rectangular frame shape in a plan view in the space between the upper plate portion and the lower plate portion in the vicinity of the radially outer side of the hole portion, and the second reinforcing member is disposed in a rectangular frame shape . are arranged in a plate shape extending obliquely outward direction at one end portion to the end portion of the first reinforcing member is connected, the third reinforcing members and the second reinforcing member substantially perpendicular to the end portion of the first reinforcing member It arrange | positions in a direction and is arrange | positioned in plate shape so that a 1st reinforcement member and a 2nd reinforcement member may make a substantially triangular shape in planar view.
[0007]
According to the swivel support mechanism configured as described above, in the longitudinal cross-sectional view of the support main body portion, the reinforcing member is arranged so that the space portion is partitioned into cells by the upper plate portion, the lower plate portion, and the first to third reinforcing members. By disposing, the weight of the swivel base can be dispersed to the members that partition the cell, and the rigidity of the support main body portion that supports the swivel base can be improved. Further, the support main body according to the present invention is configured so that the upper plate is cantilevered at the upper end of the reinforcing member and the swivel is placed on the upper plate by partitioning it in a cell shape. The desired rigidity can be obtained even if the thickness of the reinforcing member is made thinner than that of the support main body. 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.
In this case, it is preferable that the support main body portion further includes a side plate portion connecting the end portions of the upper plate portion and the lower plate portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments 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 turnable and movable up and down on a vehicle body and configured to be extendable and retractable, and a work table that is swingably mounted on the tip of the boom. However, before describing the swivel support mechanism, an 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 track vehicle 2 that can travel. The truck vehicle 2 includes a pair of chassis frames 3 extending in the front-rear direction with a predetermined interval in the left-right direction, and a pair of front wheels 5 are rotatably disposed on the left and right side portions on the front side of the chassis frame 3. A pair of rear wheels 7 are rotatably arranged on the left and right sides of the vehicle so as to be able to travel on the road, and a driving cabin 9 is provided at the front.
[0010]
A sub-frame 18 extending in the front-rear direction is attached to the pair of chassis frames 3 that protrude rearward from the driving cabin 9. As shown in FIG. 5B, the sub-frame 18 is an upper plate that is hollow inside and has a rectangular cross-sectional shape, is opposed to each other with a predetermined interval in the vertical direction, and extends substantially horizontally in the front-rear direction. It comprises a part 19 and a lower plate part 23 and a pair of side plate parts 27 that connect these left and right end parts up and down. As shown in FIG. 2 (a), front jacks 31 and 32 and rear jacks 35 and 36 are provided at both left and right ends of the front and rear sides of the subframe 18 so as to be able to project vertically and horizontally. ing.
[0011]
A circular hole 20 is formed at the center of the upper plate 19 on the front side of the vehicle relative to the rear jacks 35 and 36. A swivel base 40 shown in FIG. 3 is attached to the hole 20 so as to be capable of horizontal swiveling. Specifically, as shown in FIG. 3, an annular base ring 41 is attached to the upper plate portion 19 radially outside the hole portion 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 to the base ring 41 so as to be rotatable in the circumferential direction. A swivel base 40 is attached to the upper part of the swivel race 43 with a fastening jig such as a bolt (not shown). For this reason, the swivel base 40 can swivel with respect to the base ring 41.
[0012]
The turning race 43 has a gear 43a formed on the outer peripheral surface thereof, and a driving gear (not shown) provided on the upper plate portion 19 meshes with the gear 43a, and the turning race 43 is rotated by the rotational drive of the driving gear. Thus, the turntable 40 is configured to turn. As shown in FIG. 4, the swivel base 40 has a disk-like flange portion 45 attached to the swivel race 43 shown in FIG. 3, and a swivel main body portion 47 protruding upward from the upper surface of the flange portion 45. It is configured. The swivel main body 47 has a pair of protrusions 47a arranged to face each other with a predetermined interval in the left-right direction.
[0013]
As shown in FIG. 1, a boom 50 pivotally connected to a base portion is attached between the upper ends of the pair of projecting portions 47a and 47a so as to be swingable up and down. The boom 50 is configured to be extendable and retractable by a telescopic cylinder (not shown) built in a base type boom 50a, an intermediate boom 50b, and a distal end boom 50c in a nested manner. The boom 50 is raised and lowered by a raising and lowering cylinder 53.
[0014]
A vertical post 55 is attached to the front end of the boom 50 so as to be swingable up and down. The vertical post 55 is attached to the front end of the boom 50 by a leveling device (not shown) regardless of the undulation 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 turn horizontally, and a work table 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 subframe 18 of the aerial work vehicle 1 configured as described above. The swivel base support mechanism includes 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, arranged in the space portion 20a in the subframe 18 on the radially outer side of the hole portion 20 and extending vertically, and the upper end portion is connected to the upper plate portion 19 and the lower end portion is the lower plate. It is connected to part 23. The reinforcing members 71 and 73 among these reinforcing members 70 to 81 are, as shown in FIG. 5B, the upper plate portion 19, the lower plate portion 23, and the reinforcing members 71 and 73 in the longitudinal sectional view of the subframe 18. Thus, the space portion 20a is arranged so as to be partitioned into cells.
[0016]
The reinforcing members 70 to 81 will be described in further detail. As shown in FIG. 5A, the four reinforcing members 70 to 73 are disposed between the upper plate portion 19 and the lower plate portion 23 in the vicinity of the radially outer side of the hole portion 20. They are arranged in a rectangular shape in a plan view in the space portion 20a of, and reinforcing members 74 to 77 which they extend four connected one end portion at each end of the reinforcing member 7 0-73 obliquely outward is provided Yes. Further, the end portions of the four reinforcing members 70 to 73 arranged in a rectangular shape are adjacent to the reinforcing members 74 to 77 extending in the obliquely outward direction and extending in the vehicle left-right direction. Four reinforcing members 78 to 81 having a substantially triangular shape in plan view with the reinforcing member are disposed.
[0017]
By arranging the plurality of reinforcing members 70 to 81 in this manner, the space portion 20a located on the radially outer side of the hole portion 20 is partitioned like a cell, as in the case shown in FIG. A cellular structure portion 83 having a so-called ramen structure including the plate portion 19, the lower plate portion 23, and the reinforcing members 70 to 81 is formed. Here, the swivel base 40 shown in FIG. 3 is supported by the lower plate portion 23 through the upper plate portion 19, the side plate portion 27, and the reinforcing members 70 to 73 of the cellular structure portion 83. In addition, partitioning the space part 20a into cells means a state in which a plurality of small chambers are formed in the space part 20a like a honeycomb, for example.
[0018]
For this reason, the cellular structure portion 83 shown in FIG. 5B distributes the weight of the swivel base 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 cellular structure portion 83 can have higher rigidity than the rigidity of the support portion 91 that cantilever-supports the swivel base 40 by the upper plate portion 19 and the reinforcing member 90 shown in FIG.
[0019]
For example, when the plate thickness of the upper plate portion 19 and the lower plate portion 23 shown in FIG. 5B is set to the same thickness as that of the upper plate portion 19 and the lower plate portion 23 shown in FIG. Even if the plate thickness of the reinforcing members 71 and 73 shown in FIG. 5B is made thinner than the plate 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 support portion 91 shown in FIG. For this reason, the weight of the whole part which supports the turntable 40 can be made light, and the increase in a vehicle weight can be suppressed.
[0020]
【The invention's effect】
As described above, according to the swivel support mechanism of the present invention, the space is partitioned into cells by the upper plate portion, the lower plate portion, and the first to third reinforcing members in the longitudinal cross-sectional view of the support main body portion. By arranging the reinforcing member as described above, the weight of the swivel base can be distributed to the members partitioning in a cell shape, and the rigidity of the support main body portion supporting the swivel base can be improved. Further, the support main body according to the present invention is configured so that the upper plate is cantilevered at the upper end of the reinforcing member and the swivel is placed on the upper plate by partitioning it in a cell shape. The desired rigidity can be obtained even if the thickness of the reinforcing member is made thinner than that of the support main body. 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.
FIG. 2 shows a subframe mounted on a chassis frame according to an embodiment of the present invention, where 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 base attached to a subframe in an embodiment of the present invention.
FIG. 4 is a perspective view of a swivel base in an embodiment of the present invention.
FIG. 5 shows a swivel support mechanism according to an embodiment of the present invention, in which FIG. 5 (a) is a plan view of the swivel support mechanism, and FIG. 5 (b) is a view of VV in FIG. 5 (a). Sectional drawing of the part corresponded to an arrow is shown.
FIG. 6 shows a conventional swivel support mechanism, in which FIG. 6 (a) is a plan view of the swivel support mechanism, and FIG. 6 (b) is a portion corresponding to the VI-VI arrow view of FIG. FIG.
[Explanation of symbols]
1 Aerial work vehicle (work vehicle)
2 Truck vehicles (body)
3 Chassis frame 18 Subframe (supporting body)
19 upper plate part 20 hole part 23 lower plate part 40 swivel base 70-81 reinforcement member

Claims (2)

A vehicle body with a chassis frame extending back and forth;
A hollow support body portion that is attached to the chassis frame of the vehicle body and has at least an upper plate portion and a lower plate portion that are opposed to each other with a predetermined interval in the vertical direction and extends in the front-rear direction;
A swivel support mechanism for a working vehicle, comprising a swivel mounted in a freely swingable manner in a hole formed in the upper plate portion of the support main body,
A plurality of reinforcing members arranged in a space part in the support main body part on the radially outer side of the hole part and extending in the vertical direction, with an upper end part connected to the upper plate part and a lower end part connected to the lower plate part,
The plurality of reinforcing members include a first reinforcing member, a second reinforcing member, and a third reinforcing member,
The first reinforcing member is disposed in a rectangular frame shape in plan view in a space portion between the upper plate portion and the lower plate portion in the vicinity of the radially outer side of the hole portion,
The second reinforcing member is disposed in a plate shape extending in an obliquely outward direction with one end connected to the end of the first reinforcing member disposed in the rectangular frame shape ,
The third reinforcing member is disposed at an end of the first reinforcing member in a direction substantially perpendicular to the second reinforcing member, and is substantially triangular in plan view with respect to the first reinforcing member and the second reinforcing member. A swivel support mechanism for a working vehicle, characterized by being arranged in a plate shape so as to form a shape.   2. The swivel support mechanism for a work vehicle according to claim 1, wherein the support main body further includes a side plate connecting the end portions of the upper plate and the lower plate.

Images