JP6455130B2 - Crane vehicle outrigger reinforcement structure - Google Patents

Description

  The present invention relates to an outrigger reinforcement structure for a crane vehicle, in which an outrigger reinforcement member is interposed between a body frame and an outer cylinder of the outrigger in order to reinforce the outrigger of the crane vehicle.

  As shown in FIG. 5, a crane vehicle (for example, a wheel crane) is provided with outriggers 2, 2. A crane work machine including a swivel and a boom is mounted in the center. In addition, in FIG. 5, illustration of the crane working machine mounted on the vehicle body frame 1 is abbreviate | omitted.

  In this type of crane vehicle (for example, FIG. 5), the crane work machine is operated with the jack 23 provided at the tip of the inner cylinder 22 of each outrigger 2, 2,. When the suspension load is large, high stress is generated in the outrigger 2.

  Therefore, conventionally, in order to reinforce the outrigger against high stress acting on the outrigger 2, the outrigger reinforcement structure shown in FIGS. The known outrigger reinforcement structure shown in FIGS. 5 to 7 includes the outrigger reinforcement members 3A, 3A,... Interposed between the outriggers 2, 2,. 6 corresponds to that described in FIG. 7 of Japanese Patent No. 3959561 (Patent Document 1).

  The outrigger reinforcing member 3A used in the known examples of FIGS. 5 to 7 is in a downward posture in the vicinity of both front and rear side portions of the lower surface side of the upper surface plate 31 that is long in the length direction of the outrigger 2 (left and right direction of the vehicle body frame 1). The front and rear side plates 32, 32 are welded to each other. In addition, before and after here is the front and rear in a crane vehicle (body frame 1 in FIG. 5).

  In the known outrigger reinforcement structure, as shown in FIGS. 6 and 7, the base-side tip edge 31 a of the top plate 31 of the outrigger reinforcement member 3 </ b> A is used as the side surface on the outrigger extension side of the top plate 11 of the vehicle body frame 1. While being welded to the portion 11a (welded portion B), the front end side lower edge 32a of the front and rear side plates 32, 32 of the outrigger reinforcing member 3A is welded to the upper surface 21a of the outer cylinder 21 of the outrigger 2 via the floor plate 34. Further, the vehicle body frame 1 and the outer cylinder 21 of the outrigger are connected to each other by welding the tip of the outrigger reinforcing member 3A to the headband 24 of the outer cylinder 21. The upper surface plate 31 of the outrigger reinforcing member 3A is inclined downward toward the front side of the outer cylinder 21 of the outrigger.

  By the way, when a crane is operated, a large load is applied in the vicinity of the turning center P due to the suspended load, and when the jacks 23 of the outriggers 2, 2,. 31 and the vehicle body frame 1 are concentrated in the vicinity of the joint (welded portion B). In particular, within the length range of the joint (welded portion B), the high stress is concentrated in the vicinity of the end portion close to the turning center P (each circled A portion in FIG. 5).

  In order to ensure the strength corresponding to the high stress for the outrigger reinforcing member 3A, conventionally, the thickness of the entire upper surface plate 31 of the outrigger reinforcing member 3A is increased. Incidentally, there is an outrigger reinforcing member employed in our crane truck having a thickness of the upper surface plate 31 of about 20 mm.

  In the above known example, the substantially triangular shape that protrudes outward from the front and rear side edges 31b and 31b of the upper surface plate 31 at the front and rear end edge portions in the vicinity of the base end tip edge 31a of the upper surface plate 31 of the outrigger reinforcing member 3A. The bulged portions 31c and 31c having a shape are integrally extended. The bulged portions 31c and 31c have a function of increasing the contact length of the body frame 1 with respect to the upper surface plate 11. .

Japanese Patent No. 3959561 (particularly FIG. 7)

  By the way, the portion where high stress is generated in the outrigger reinforcing member 3A during the crane operation is mainly in the vicinity of the contact portion of the upper surface plate 31 of the outrigger reinforcing member 3A with the upper surface plate 11 of the vehicle body frame 1, and among them, the turning center. In the vicinity of the end portion close to P (the respective circled A portions in FIG. 5), in the prior art (FIGS. 5 to 7), the entire top plate 31 is made thicker to ensure the strength of the outrigger reinforcing member 3A ( For example, the thickness is 20 mm. In this way, when the thickness of the entire upper surface plate 31 is increased, the upper surface plate 31 is excessively reinforced up to the portion where the high stress is not generated.

  Therefore, in the outrigger reinforcement structure of the above-described known example (FIGS. 5 to 7), the material cost of the portion that is excessively reinforced is increased by increasing the thickness of the entire upper surface plate 31 in the outrigger reinforcement member 3A. There is a problem that the overall weight of the outrigger reinforcing member 3A increases as the height increases.

  In the outrigger reinforcing member 3A used in the above known example (FIGS. 5 to 7), the front and rear side plates 32 and 32 are fixed to the upper surface plate 31 by welding. In this case, It is necessary to cut out three plate materials of the face plate 31 and the side plates 32 and 32. Further, in order to weld the side plates 32 and 32 to the lower surface of the upper surface plate 31, it is necessary to hold the side plates 32 and 32 in proper positions with respect to the upper surface plate 31. Each side plate 32, 32 is required (twice), and the operation of welding each side plate 32, 32 is also required twice, and the weld line length is long, so the man-hours for assembling the outrigger reinforcing member 3A There were many.

  In view of this, the first aspect of the present invention is to be able to cope with high stress acting at the time of crane work even if the plate thickness of the upper plate in the outrigger reinforcing member is reduced (the material can be reduced in weight and cost). On the other hand, the second object is to facilitate the assembly of the outrigger reinforcing member.

  The present invention has the following configuration as means for solving the above problems.

[Invention of Claim 1 of the Present Application]
The invention of claim 1 is directed to an outrigger reinforcement structure for a crane vehicle in which an outrigger is disposed at a lower portion of a body frame and an outrigger reinforcement member is interposed between an upper surface of an outer cylinder of the outrigger and the body frame. Yes.

  The outrigger reinforcement member used in the outrigger reinforcement structure of claim 1 of the present application is also provided with front and rear side plates on the lower surface of the upper plate that is long in the length direction of the outrigger (the left-right direction of the vehicle body frame). The one provided in a downward posture can be adopted. This outrigger reinforcing member also welds the front end edge of the base plate of the upper surface plate to the side surface portion of the upper surface plate of the body frame, while welding the lower end edge of the front side of each of the front and rear side plates to the upper surface of the outer cylinder of the outrigger. The top end plate of the body frame and the top surface of the outer cylinder of the outrigger are connected by welding the tip of the member to the headband portion of the outer cylinder.

The outrigger reinforcement structure according to claim 1 of the present invention has a predetermined small area at a position straddling a predetermined range portion where high stress is generated during crane work on the upper surface plate of the outrigger reinforcing member and the side surface portion of the upper surface plate of the vehicle body frame. The reinforcing plate is welded in a state where a part of the reinforcing plate overlaps with the upper surface plate of the outrigger reinforcing member in plan view, while the reinforcing plate is connected to the upper surface plate of the outrigger reinforcing member and the vehicle body frame. And the thickness of the entire upper plate of the outrigger reinforcement member at the time of crane work with the outrigger reinforcement member alone. It is characterized by being thinner than the strength corresponding to the high stress.

  The reinforcing plate is preferably made of a steel plate and has a plate shape having two sides sandwiching a right angle. As the shape of the reinforcing plate, for example, a substantially right triangle or quadrangle (trapezoid having a right angle portion) is suitable.

  The size of the reinforcing plate is not particularly limited, but, for example, a right triangle or a quadrangle having a length of two sides sandwiching a right angle of about 200 to 250 mm, for example, and a thickness of about 15 mm can be adopted. It is.

  In this reinforcing plate, the edge on one side that sandwiches the right angle overlaps with the vicinity of the side edge of the upper plate of the outrigger reinforcing member by a predetermined width (for example, a width of about 50 to 70 mm) in plan view. In a state where the end face of the side is joined to the side surface portion of the upper surface plate of the vehicle body frame, welding is performed across the upper surface plate of the outrigger reinforcing member and the side surface portion of the upper surface plate of the vehicle body frame.

  On the other hand, the thickness of the upper surface plate of the outrigger reinforcing member is the thickness of the strength corresponding to the high stress at the time of crane work with the outrigger reinforcing member alone over the entire area of the upper surface plate (20 mm thickness for our conventional product) A thinner one (for example, a plate thickness of about 15 mm) is employed.

  In the outrigger reinforcement structure according to the first aspect of the present invention, since a reinforcing plate having a predetermined small area and a large thickness is applied to a predetermined range portion where high stress is generated at the time of crane work on the upper surface plate of the outrigger reinforcing member, The portion of the face plate where the high stress is generated can be reinforced with the reinforcing plate, and the strength against the high stress can be ensured even if the thickness of the entire upper plate of the outrigger reinforcing member is reduced accordingly.

The portion located at the center in the longitudinal direction of the vehicle body frame in the joint portion is a portion on the side where the swing bearing of the crane truck is installed, and is a portion on the side where a high load is generated during crane operation. . At the time of crane work by the crane vehicle, the longitudinal direction center side of the body frame at the joint between the top plate of the outrigger reinforcing member and the top plate of the body frame (the length is the same as the width of the top plate in the front-rear direction) High stress is generated near the end where it is located.

Therefore, in the outrigger reinforcing structure according to the first aspect , even if the same reinforcing plate is used, the reinforcing plate can be efficiently reinforced by providing the reinforcing plate in the vicinity of the end portion where the high stress acts in the joint portion.

[Invention of claim 2 of the present application]
The invention of claim 2 of the present application is the outrigger reinforcement structure of claim 1, wherein at least one of the side plates and the upper surface plate of the outrigger reinforcement member is a single piece of plate material continuously made by bending. It is characterized by that.

  The bending of the upper surface plate and the side plate may be only one or both of the side plates. And when bending only one side plate with respect to the upper surface plate, two plate materials, one plate material in which the area of one side plate is made continuous with the area of the upper surface plate, and the plate material for the other side plate When both side plates are bent with respect to the upper surface plate, it is only necessary to cut one plate material in which the area of each side plate is continuous on both sides of the area of the upper surface plate.

  By the way, in the outrigger reinforcement member used in the above-described known example (FIG. 6), the front and rear side plates are welded together to the upper surface plate. While it is necessary to cut out a total of three plate materials, including two pieces of each side plate portion, it is necessary to perform the operation of holding each side plate in an appropriate position with respect to the upper plate during welding and the operation of welding twice each. As a result, the number of man-hours for assembling the outrigger reinforcing member has increased.

Therefore, in claim 2 of the present application, since at least one side plate and the top plate of the outrigger reinforcing member are integrally made continuous by bending a single plate, the number of cut plate members and the position of the side plate during welding are determined. The holding frequency and the side plate welding frequency can be reduced.

[Effect of the invention of claim 1 of the present application]
The outrigger reinforcing structure according to claim 1 of the present invention is a plate with a predetermined small area at a position straddling a predetermined small range portion where high stress is generated during crane operation on the upper surface plate of the outrigger reinforcing member and the side surface portion of the upper surface plate of the vehicle body frame. By welding a thick reinforcing plate, a thinner plate material can be used for the upper surface plate without reducing the strength required for the outrigger reinforcing member. In the outrigger reinforcing structure of the present invention, although the weight is increased by the reinforcing plate, the overall weight of the outrigger reinforcing member is reduced by reducing the thickness of the entire top plate.

  Therefore, the outrigger reinforcement structure according to the first aspect of the present invention has an effect that the weight of the entire outrigger reinforcement member can be reduced without reducing the strength, and the material cost of the entire outrigger reinforcement member can be reduced.

Further, during crane work with a crane vehicle, high stress is generated near the end portion of the joint portion between the outrigger reinforcing member and the vehicle body frame that is located on the center side in the longitudinal direction of the vehicle body frame (where the swivel bearing is located). In the outrigger reinforcement structure according to the first aspect of the present invention, since the reinforcing plate is provided near the end portion where the high stress is generated in the joint portion, even the same reinforcing plate can be efficiently reinforced.

Accordingly, the outrigger reinforcing structure of claim 1, in addition to the effects of the above reporting, there is an effect that the reinforcing efficiency is improved by the reinforcing plate.

[Effect of the invention of claim 2 of the present application]
In the outrigger reinforcing structure according to the second aspect , the side plate and the upper surface plate of the outrigger reinforcing member are integrally joined together by bending, so that the upper surface plate and the both side plates constituting the outrigger reinforcing member The number of cut sheets, the number of times of holding the side plate position during welding, and the number of times of side plate welding can be reduced, and the weld line length can be reduced.

Therefore, the outrigger reinforcement structure of claim 2 has the effects of reducing the number of work steps until the outrigger reinforcement member is completed and shortening the production time of the outrigger reinforcement member in addition to the effect of claim 1 .

It is a top view which shows the assembly | attachment state of the vehicle body frame and the outrigger in the crane vehicle provided with the outrigger reinforcement structure of this-application Example. It is the II section enlarged perspective view of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is a top view which shows the assembly | attachment state of the vehicle body frame and an outrigger in the crane vehicle provided with the conventional outrigger reinforcement structure. FIG. 6 is an enlarged perspective view of a VI part in FIG. 5. It is VII-VII sectional drawing of FIG.

[Example]
Hereinafter, an outrigger reinforcing structure for a crane truck according to an embodiment of the present invention will be described with reference to FIGS. The basic structure of the crane vehicle and the outrigger reinforcement structure employed in the embodiment of the present application (the structure excluding the gist of the present application) is configured in substantially the same manner as the known examples shown in FIGS. Therefore, about the structure of the part which is common in the said well-known example in this-application Example, the same code | symbol is attached | subjected and description of this well-known example is used.

  1, the crane working machine is operated with the jack 23 provided at the tip of the inner cylinder 22 of each of the outriggers 2, 2,... When the suspension load is large, high stress is generated in the outrigger 2. In the outrigger reinforcement structure of the present embodiment, outrigger reinforcement members 3, 3,... Are interposed between the outriggers 2, 2,. .

  The outrigger reinforcing member 3 used in the embodiment of FIGS. 1 to 4 is in a downward posture near both the front and rear side portions of the lower surface side of the upper surface plate 31 that is long in the length direction of the outrigger 2 (left and right direction of the vehicle body frame 1). The front and rear side plates 32 and 33 are provided. In addition, before and after here is also the front and rear in the crane vehicle (body frame 1 in FIG. 1).

  In the outrigger reinforcement structure of this embodiment, as shown in FIGS. 2 and 4, the base-side tip edge 31 a of the upper surface plate 31 of the outrigger reinforcement member 3 is connected to the side surface on the outrigger extension side of the upper surface plate 11 of the vehicle body frame 1. While the welded portion 11a is welded (welded portion B), the front end side lower edges 33a and 32a of the front and rear side plates 32 and 33 of the outrigger reinforcing member 3 are connected to the upper surface 21a of the outer cylinder 21 of the outrigger 2 via the floor plate 34. Further, the vehicle body frame 1 and the outrigger outer cylinder 21 are connected to each other by welding the distal end portion of the outrigger reinforcing member 3 to the headband portion 24 of the outer cylinder 21. The upper surface plate 31 of the outrigger reinforcing member 3 is inclined downward toward the front side of the outrigger outer cylinder 21. In addition, several reinforcing plates are installed on the lower surface side of the upper surface plate 31 of the outrigger reinforcing member 3 in addition to the front and rear side plates 32 and 33. These reinforcing plates are related to the gist of the present application. Since there is no description, it abbreviate | omits description.

By the way, in the crane vehicle of the embodiment of FIG. 1, during the crane operation, a large stress may be generated near the turning center P due to the suspension load, and at that time, the jacks 23 of the outriggers 2, 2,. Thus, high stress due to the suspended load is generated in the vicinity of the joint portion (welded portion B) between the upper surface plate 31 of the outrigger reinforcing member 3 and the vehicle body frame 1. In particular, the high stress is concentrated in the vicinity of the end portion on the side close to the turning center P (the circled portion A in FIG. 1) of the welded portion B between the upper plate 31 of the outrigger reinforcing member 3 and the vehicle body frame 1. To occur.

  Therefore, in the outrigger reinforcing structure of the present embodiment, the following high stress is applied to the outrigger 2 as follows.

In other words, in the outrigger reinforcement structure of this embodiment, the upper trigger plate 3 of the outrigger reinforcement member 3 spans a predetermined range where high stress is generated during crane operation and the side surface portion 11a of the upper plate 11 of the vehicle body frame 1. The thick reinforcing plate 4 with a predetermined small area is welded. The portion of the upper plate 31 of the outrigger reinforcing member 3 where high stress acts during crane operation is the portion A of each circle A in FIG. 1 and the base portion of each upper plate 31, 31. ) In the vicinity of the end near the turning center P.

  The reinforcing plate 4 is preferably made of a steel plate and has a plate shape having two sides sandwiching a right angle. The shape of the reinforcing plate 4 is preferably, for example, a substantially right triangle or quadrangle (trapezoid having a right angle portion). The size of the reinforcing plate 4 is not particularly limited. For example, the length of two sides sandwiching a right angle is an area of a substantially right triangle or quadrangle having a length of about 200 mm to 250 mm, for example, and a thickness of about 15 mm. Can be adopted.

  The reinforcing plate 4 is in a state where a part of the reinforcing plate 4 is overlapped by a predetermined width (W2 in FIG. 4) in the vicinity of one side edge portion 31b of the upper surface plate 31 of the outrigger reinforcing member 3 in plan view. 4, a portion in contact with the upper surface plate 31 of the outrigger reinforcing member 3 and a portion in contact with the side surface portion 11 a of the upper surface plate 11 of the vehicle body frame 1 are welded.

  The width at which the reinforcing plate 4 overlaps the upper surface plate 31 of the outrigger reinforcing member 3 is not particularly limited. However, in FIG. 4, if the longitudinal width W1 of the entire reinforcing plate 4 is 250 mm, for example, A width W2 of about 20 to 30% (W2 = about 50 to 70 mm, for example) is appropriate.

  The portion where the reinforcing plate 4 is installed (the circled portion A in FIG. 1) is a portion where high stress is generated due to a suspended load during crane operation. By installing the reinforcing plate 4 in this portion, the outrigger reinforcing member The strength required for the upper surface plate 3 can be improved.

  Therefore, in the outrigger reinforcing structure of this embodiment, the strength required for the upper surface plate 31 of the outrigger reinforcing member 3 can be improved by using the reinforcing plate 4 so that the plate thickness of the upper surface plate 31 of the outrigger reinforcing member 3 is increased. Over the entire area of the upper surface plate 31, the outrigger reinforcing member alone can be made thinner than the thickness of the strength corresponding to the high stress during crane work (20mm thickness for our conventional product). Yes. That is, in this embodiment, the thickness of the entire area of the upper surface plate 31 is reduced to, for example, about 15 mm.

  As described above, when the reinforcing plate 4 having a predetermined small area and a large thickness is installed in a predetermined range portion (circled portion A in FIG. 1) where high stress acts during crane work, the upper surface plate of the outrigger reinforcing member 3 The portion where the high stress is generated in 31 can be reinforced with the reinforcing plate 4, and the strength against the high stress can be ensured even if the thickness of the entire upper surface plate 31 of the outrigger reinforcing member 3 is reduced accordingly.

  Even in the outrigger reinforcement structure of the present embodiment, the upper surface plate 31 is located on the edge portion (the edge portion far from the turning center P) where the reinforcement plate 4 is not present in the vicinity of the base end tip edge 31a of the upper surface plate 31 of the outrigger reinforcement member 3. A substantially triangular bulging portion 31c that protrudes outward from the side edge 31b of the vehicle body is integrally extended, and the bulging portion 31c increases the length of contact with the upper surface plate 11 of the body frame 1. The load applied to the upper surface plate 31 of the outrigger reinforcing member is transmitted to a wide range of the upper surface plate 11 of the vehicle body frame.

  In the outrigger reinforcing structure of the present embodiment, as shown in FIGS. 2 and 4, the side plate 33 and the upper surface plate 31 on the side where the reinforcing plate 4 is installed in the outrigger reinforcing member 3 are combined into a single piece. The plate material is made continuous by bending. In this embodiment, the upper surface plate 31 and one side plate 33 are bent. However, in the other embodiments, both the front and rear side plates 32 and 33 are bent with respect to the upper surface plate 31, respectively. Good. When only one side plate 33 is bent with respect to the upper surface plate 31, one plate material in which the area of the one side plate 33 is made continuous with the area of the upper surface plate 31, and the plate material for the other side plate 32 In the case where both side plates 32 and 33 are bent with respect to the upper surface plate 31, the areas of the side plates 32 and 33 are continuously provided on both sides of the area of the upper surface plate 31. It is only necessary to cut out a single plate material.

  By the way, in the outrigger reinforcement member 3A used in the outrigger reinforcement structure of the above-described known example (FIG. 6), the front and rear side plates 32, 32 are both welded to the top plate 31, so It is necessary to cut a total of three plate materials, one for 31 portions and two for each side plate 32, 32, and work to hold each side plate 32, 32 in an appropriate position with respect to the top plate 31 during welding Since the welding line length has become longer, the number of work steps for assembling the outrigger reinforcing member has increased.

  Therefore, as in the embodiment of the present application (see FIGS. 2 and 4), when at least one side plate 33 and the upper surface plate 31 in the outrigger reinforcing member 3 are continuously made by bending a single plate material, The number of cut plate materials, the number of times of holding the side plate position during welding, and the number of times of side plate welding can be reduced, and the weld line length can be shortened, whereby the production time of the outrigger reinforcing member 3 can be shortened.

  1 is a body frame, 2 is an outrigger, 3 is an outrigger reinforcing member, 4 is a reinforcing plate, 11 is a top plate of the body frame, 11a is a side surface, 21 is an outer cylinder, 21a is an upper surface of the outer cylinder, 22 is an inner cylinder, Reference numeral 23 denotes a jack, 31 denotes an upper plate of the outrigger reinforcing member, 32 denotes a side plate (weld side plate), and 33 denotes a side plate (bending side plate).

Claims (2)

An outrigger reinforcement structure for a crane vehicle in which an outrigger is disposed at a lower portion of a vehicle body frame and an outrigger reinforcement member is interposed between an upper surface of an outer cylinder of the outrigger and the vehicle body frame,
A reinforcing plate having a predetermined small area and a large thickness is provided at a position straddling a predetermined range portion where high stress is generated during crane operation on the upper surface plate of the outrigger reinforcing member and a side surface portion of the upper surface plate of the body frame. While being welded in a state where a part of the reinforcing plate overlaps with the upper plate of the outrigger reinforcing member in plan view,
The reinforcing plate is provided in the vicinity of the end portion located on the center side in the longitudinal direction of the vehicle body frame at the joint portion between the upper surface plate of the outrigger reinforcing member and the side surface portion of the upper surface plate of the vehicle body frame,
The thickness of the entire upper plate of the outrigger reinforcing member is made thinner than the thickness of the strength corresponding to high stress during crane work by the outrigger reinforcing member alone.
An outrigger reinforcement structure for a crane vehicle, characterized by that. In claim 1,
The at least one side plate and the upper surface plate in the outrigger reinforcing member are obtained by continuously integrating a single plate material by bending.
An outrigger reinforcement structure for a crane vehicle, characterized by that.

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