JP2004203279A - Joint with wedge type insertion material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strong and inexpensive joint material capable of precisely joining supports to each other almost without depending upon a model, a portion or a connecting angle, and enduring comparatively large impact. <P>SOLUTION: This joint 10 to fix and connect a frame material 7 of a cabin loaded on a working vehicle such as a construction machinery and an agricultural machinery has the frame material 7 furnished with the support 2 applied with bending work and having a cavity roughly at a central part, a joint body 10e inserted in the cavity of the support 2 and to fix and connect the frame materials 7 to each other and an insertion material 10a (or, 10b, 10c, 10d) forming a roughly wedge shape arranged in the insertion part of the joint body 10e, and the supports are connected to each other as the insertion material 10s (or, 10b, 10c, 10d) different in a wedge angle in accordance with an assembly angle of the frame material 7 is arranged on the joint insertion part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint for fixedly connecting a frame material of a cabin mounted on a working vehicle such as a construction machine or an agricultural machine.
[0002]
[Prior art]
Conventionally, when a heavy machine such as a hydraulic excavator falls over, the cabin has been crushed by the overturning load and it has been impossible to protect workers. Various researches on materials and joint materials have been conducted.
[0003]
For example, as a frame material, a cross-section called a deformed tube shown in Japanese Unexamined Patent Application Publication No. H09-150756 (Patent Document 1) or the like, or a modified tube is disclosed in Japanese Unexamined Patent Application Publication No. 2002-115268 (Patent). For example, in the frame material indicated by 7 in FIG. 8 such as literature 2), a reinforcing member (3c, 3d, 3e, 3f) is attached or a reinforcing member is inserted therein, and a large section modulus is provided. There are known reinforcements to cope with a fall accident.
[0004]
The complicated irregular shape is provided in a shape effective for attaching another auxiliary member such as a glass member to the irregular surface, and is formed so as to be convenient for assembly.
[0005]
On the other hand, as a joint material, Japanese Patent Application Laid-Open No. 2000-198469 (Patent Document 3) is known. The joint indicated by 10 in FIG. 7 is for fixedly connecting the frame member 7 such as the above-mentioned deformed pipe shown by 7a and 7b in FIG.
[0006]
As described above, in order to cope with the falling accident and maintain the three-dimensional shape of the cabin, the joint 10 processed to fit into the frame member 7 having a complicated cross-sectional shape is inserted into the end face of the frame member and welded. I have.
[0007]
Generally, joint materials are made by laminating several press-processed thin sheet materials.However, there is a problem with strength, especially in recent years when strength is required to cope with a fall accident etc., casting or forging It is firmly formed by such as.
[0008]
[Patent Document 1] Japanese Patent Application Laid-Open No. H09-150756 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-115268 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-198469 [0009]
[Problems to be solved by the invention]
In the above-mentioned conventional (Patent Document 2) and frame having a modified cross-sectional shape as shown in FIG. 8 and having a large cross-sectional modulus and providing reinforcement, a structure is obtained in which the weight of the cabin is reduced lightly and the strength is maintained moderately. Nevertheless, the joint must maintain its strength in a very complicated shape as shown in FIG. In general, the joint portion is manufactured through a pressing process by a method of increasing the section modulus in the same manner as described above, but this has been a problem because very strong strength cannot be obtained.
[0010]
On the other hand, Patent Literature 3 discloses a method of manufacturing a joint by casting. For example, manufacturing a joint 10 having a complicated shape shown in FIG. 7 by casting requires an expensive mold cost. Due to the design of the cabin, the irregular shape of the frame, the thickness of the frame, the joint angle and the number of sides of the joint are various, and even one cabin has many joints, each with different mounting angles etc. In each case, a casting mold of such a complicated shape must be manufactured, which is very expensive.
[0011]
Moreover, if the model of the cabin joint changes, the design etc. will naturally differ, so the joint type of the above-mentioned joint must be created for each model, and the number of types increases, which is a problem. .
[0012]
On the other hand, in order to obtain the strength of the joint, a method of manufacturing the joint by forging is also conceivable. For example, in order to forge the joint 10 having a complicated shape shown in FIG. 7, several dies for several steps are required. However, in the same way as described above, due to the cabin design, the irregular shape of the frame, the thickness of the frame, or the joint angles and variables of the joint, etc. Since the parts are mixed, a forging die for a plurality of steps of a joint having such a complicated shape must be manufactured for each part, which is very expensive.
[0013]
In addition, in order to cope with a falling impact, a double frame structure in which a rigid support or the like is inserted into the frame material, as disclosed in the use of a strength frame material (Patent Document 2), etc., and FIG. A known method is to bond a press member 3d, 3e to a rigid support 2 shown in FIG. 6 to obtain a frame member shown in FIG.
[0014]
In the case of a frame material having such a rigid support, a springback variation error occurs during the bending of the support. However, to joint the supports, a strong joint by the above-described casting or forging is used. Although a joining method using a material is desired, it is difficult to assemble accurately with a rigid frame material (post) having an accurately machined rigid joint and an error. And fixed by wire welding or spot welding in the most convenient posture.
[0015]
However, when an external force such as an overturning impact is applied to the joint, stress is intensively applied to the line-shaped (or spot-shaped) welded joint, and it becomes difficult to absorb the external force only with this weld. There is a problem that a crack is generated in the welded portion and the cabin is crushed.
[0016]
Therefore, there is a demand for an inexpensive and strong joint method that can cope with a sturdy frame material.
[0017]
SUMMARY OF THE INVENTION An object of the present invention is to provide a strong and inexpensive joint material that can accurately connect struts with each other and withstand relatively large impacts, without depending on a model, a part, or a joint angle.
[0018]
[Means for Solving the Problems]
The wedge-shaped joint with an insert material of the present invention is a joint for fixing and connecting a frame material of a cabin mounted on a working vehicle such as a construction machine or an agricultural machine in order to solve the above-described problems of the conventional example, and the bending process is performed. A frame material provided with a support having a hollow at a substantially central portion thereof, a joint body inserted into the hollow of the support and fixedly connecting the frame materials, and a substantially wedge-shaped shape arranged at an insertion portion of the joint body. And an insertion member having a wedge angle different according to an assembling angle of the frame member is disposed in the joint insertion portion, so that the columns are connected to each other.
[0019]
Further, it is preferable that insertion members having the same wedge angle and different thicknesses are arranged on opposite surfaces of the joint insertion portion so as to face each other in opposite directions.
[0020]
Further, the joint angle Rh of the joint main body is provided to be larger than the insertion angle Ri between the columns, and the insertion material inserted on the side located on the outer side has a shape in which the tip becomes thinner toward the inside of the column, and the end surface (outside) Since the struts are driven into the inside and the struts are joined to each other, the fixing at the joint insertion portion becomes simple and extremely robust.
[0021]
(Action)
With the above configuration, the present invention can perform the following operations. That is, a frame member provided with a post having a hollow at a substantially central portion, which is a joint for fixedly connecting a frame material of a cabin mounted on a working vehicle such as a construction machine or an agricultural machine, and a hollow of the post. A joint body that is inserted into the frame body and fixedly couples the frame members, and an insertion material that has a substantially wedge-shaped shape disposed in an insertion portion of the joint body, and has a wedge angle depending on an assembling angle of the frame material. The struts are connected to each other by arranging different inserts in the joint insertion portion. Therefore, when forming a three-dimensional object (cabin), according to the bending accuracy of the strut (strength member) subjected to the bending process. The size of the gap formed between the cavity of the column and the joint body inserted into the cavity changes in a similar manner to the cross section of a substantially triangular shape. ) The tip is inserted between the support cavity and the joint body, and it is fastened so that there is no backlash. The wedge position varies with the size of the gap (bending accuracy), but the joint body is It will be securely fastened along the column.
[0022]
Also, wedge-shaped inserts can be manufactured at extremely low cost, and since these are arranged on the joint body, various joints can be manufactured at low cost by combining the shape, angle, and thickness of the insert. .
[0023]
Also, in the above, especially on the opposite surface of the joint insertion portion, if the wedge angles are equal and the insertion materials having different thicknesses are arranged in a manner facing each other in opposite directions, the struts are via the joint body, By joining the joints on both sides of the joint body with inserts of different thicknesses on both sides without any gaps, it is possible to avoid the concentration of stress on the welded part, obtain a structure that applies external pressure on both sides, and at the wedge angle Depending on the formed joint angle, the joint angle of the joint body is changed to an angle different from that of the joint body, and a robust and accurate mounting angle can be realized.
[0024]
Further, the joint angle Rh of the joint main body is provided to be larger than the insertion angle Ri between the columns, and the insertion material inserted on the side located on the outer side has a shape in which the tip becomes thinner toward the inside of the column, and the end surface (outside) If the struts are connected to each other and the struts are connected to each other, the joint body angle Rh is in a relationship of Rh> Ri with respect to the inter-strut insertion angle Ri, and the gap is determined according to the difference between Rh and Ri. The size is determined. Here, the relationship of Rh> Ri indicates that the joint body is in a more open appearance.
[0025]
For example, with the joint assembling method having the above relationship, first, the size of the gap on both sides of the insertion portion is checked in advance, and the thickness of the insertion material to obtain a desired frame angle is determined, Subsequently, the insertion material located inside the bent portion of the joint has a wedge shape in which the tip becomes thinner from the inside of the support column toward the end surface (toward the joint portion), and is previously fixed to the joint body by welding. Next, a joint body having an insertion material attached inside the bent portion is inserted into the column cavity, and this time, the insertion material located outside the bent portion of the joint is inserted from the outside of the column to the inside (of the column). It has a wedge shape with the tip narrowing toward (inward), and is driven into the space between the joint main body and the support from outside to be firmly fixed.
[0026]
That is, in the relation of Rh> Ri, a structure is obtained in which wedges can be driven in from the outside at the final stage of the joint assembly, and the support and the joint body are united by the insertion pressure of the wedges, pressed into contact with each other and temporarily assembled. By doing so, the temporary assembly is accurately performed without play, and work such as welding stop can be performed extremely easily for each inserted material.
[0027]
The structure in which the members are integrally pressed together on the surface acts to receive and disperse the stress on the surface to obtain an extremely strong structure.
[0028]
As described above, the wedge-shaped joint with an insertion material of the present invention is a strong and inexpensive that can accurately connect the struts with each other and can withstand a relatively large impact, etc., with almost no dependence on the model, site, or joint angle. A simple joint material can be realized.
[0029]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 5 show an embodiment of the present invention.
[0030]
Here, the frame members (posts) indicated by 7a and 7b in FIG. 1 will be briefly described with reference to FIGS.
[0031]
Reference numeral 7 shown in FIGS. 4A and 4B indicates four wedge-shaped ribs 1 (1a, 1b, 1c, and 1d), a strut 2 made of a slightly bent thick plate member, and press working. It is a frame member provided with a thin sheet metal decorative cover member 3 (3a).
[0032]
The support 2 having a U-shaped cross section indicated by reference numeral 2 in FIG. 5A and having a bent portion provided with a cavity therein is bent at a bending angle indicated by R1 in FIG. 4 by a bender device. However, since it is a strength member made of a thick plate, a springback variation error occurs during bending due to the ratio and distribution of the material and the room temperature and oil temperature during processing.
[0033]
On the other hand, the decorative cover materials 3 and 3a having a thickness of 1.6 mm (thin sheet metal) are manufactured by being pressed with a mold, so that the quality is extremely uniform and the error is small enough to be ignored. . The decorative cover material 3a is partially open in a concave cross section shown in FIG.
[0034]
Here, first, in the first step, the column 2 which is a strength member having the above-mentioned bending angle error is inserted from the opening. Then, a fan-shaped (triangular cross section) gap is generated between the decorative cover material 3a and the support column 2 with R1 as a fulcrum according to the size of R1. The wedge-shaped rib shown by 1 in FIG. 4 is inserted into this gap to fill the gap, so that the decorative cover material 3a and the support 2 are fixed in position.
[0035]
This wedge-shaped rib 1 is a rib having a flat surface on both sides forming a wedge-shaped cross section whose tip gradually narrows, and a wedge-shaped rib substantially matching the fan-shaped area is selected. ), The wedge-shaped rib shown at 1a in the figure is divided into two at the point of the bending point (breaking point) position R1 and each tip becomes narrower from the inside toward the end face. The wedge-shaped rib shown in FIG. 1b is inserted in the direction shown by D1 and further confronted in the opposite direction, and the tip becomes narrower from the inside toward the end face on the same side surface. It is inserted from the direction shown.
[0036]
Next, in the second step, in FIG. 4B, the wedge-shaped ribs 1c and 1d are divided into two at a point corresponding to a bending point (breaking point) position R1, and the bending point direction from the outside. The wedge-shaped rib shown by 1c in the figure is driven in the direction shown by D3 in the figure with the tip becoming thinner toward, and further in the opposite direction, it is also on the same side, from the outside in the direction of the bending point. The wedge-shaped rib shown by 1d in the figure is driven in the direction shown by D4 in the figure with the tip becoming thinner toward the end, and the decorative cover material 3a and the support 2 become a frame material that is firmly fixed on both surfaces of the flat plate. .
[0037]
In the frame member 7 provided as described above, in the frame member shown in FIG. 5, in the first step shown in FIG. 5A, as described above, the support 2 is inserted into the decorative cover member 3 a, Thus, a wedge-shaped rib shown by 1a (or 1b) in FIG. 4A is inserted.
[0038]
Next, the opening of the decorative cover material 3a is formed by pressing the auxiliary member 3b of a thin sheet metal provided in a lid shape having a concave cross section by press working from the upper side shown by D in FIG. Is in contact with and covers the opening.
[0039]
In the second step shown in FIG. 5 (c), the wedge-shaped ribs shown by 1c and 1d in FIG. 1 are driven in such a manner that the tips become narrower from both end faces (outside) toward the bending point direction. Then, the decorative cover member 3a, the auxiliary member 3b, and the column 2 are firmly fixed.
[0040]
That is, the decorative covering material 3a and the auxiliary member 3b are pressed and contacted by the wedge-shaped ribs 1c and 1d which are driven between the support columns 2, and are rigidly temporarily assembled, and are welded and fixed in the temporarily assembled state. It is.
[0041]
The principle in which the frame members 7a and 7b configured as described above are jointed at an attachment angle indicated by Rj in FIG. 1B will be described in detail below.
[0042]
The angle Rj is an assembly angle formed by the decorative cover members 3 of the frame members 7a and 7b as shown in FIG. The columns 2 and 2 have bending errors indicated by d3 and d4 in FIG. 1A, and the insertion angle between the columns is different from Rj and is an angle indicated by Ri in FIG. .
[0043]
On the other hand, the joint angle of the joint body 10e is provided at an angle indicated by Rh in FIG. 2, and has a relationship of Rh> Ri. The joint body 10e is formed by casting or forging.
[0044]
Here, in the joint main body indicated by 10e in FIG. 3A, first, the insertion portion of the support 2 is examined in advance to determine the size of the gap on both sides thereof, and the insertion is performed to obtain a desired frame angle Rj. The materials (10a, 10b, 10c, 10d) are respectively determined.
[0045]
In addition, the appearance (10a and 10b or 10c and 10d) in which the insertion material with the same wedge angle (10a and 10b has the same wedge angle and 10c and 10d has the same wedge angle) on the opposite surface of the joint insertion portion is opposite to each other. Arrangement).
[0046]
Subsequently, an insert (10b, 10d in FIG. 3B) located inside the bent portion of the joint 10 has a wedge shape in which the tip becomes thinner from the inside of the support 2 toward the end surface (toward the joint portion). It is fixed by welding to the joint body 10e in advance.
[0047]
Next, the joint body 10e to which the insertion members 10b and 10d located inside are attached is inserted into the hollow portion of the column 2, and this time, the insertion members 10a and 10c located outside the bent portions of the joint 10 are removed. The wedge shape is such that the tip becomes thinner from the outside of the columns 2 and 2 toward the inside (inward direction of the columns), and is firmly fixed between the joint body 10e and the columns by being driven from the external direction shown by the arrow in FIG. become.
[0048]
That is, the angle Rh is changed to the angle Ri by a wedge angle that can be freely selected, and the columns 2, 2 as the strength members are firmly joined to each other. Here, d shown in the enlarged view of the insertion member 10a in FIG. 3B indicates the thickness of the insertion member 10a, and absorbs the bending error of the column shown by d3 and d4 in FIG. , And has the function of joining the decorative cover materials 3 and 3 at an angle Rj.
[0049]
The insert 10a has a triangular cross-section, that is, an insert having a wedge shape with a gradually narrowed tip, and having flat surfaces on both sides, and a wedge-shaped insert substantially matching the fan-shaped gap area. Is the choice.
[0050]
In the final stage of the assembling, the support 2 and the joint body 10e are integrated with each other by the insertion pressure of the wedge, so that the wedge (the insert 10a) having the above shape can be driven in from the outside at the final stage of the assembly. Temporarily assembled without any play.
[0051]
In this way, the columns 2, 2 are firmly connected to each other, and the drawing is omitted due to space limitations. However, the joints are covered with a decorative cover made of a sheet metal formed by pressing, so that a joint having good appearance and strength can be obtained. Has been realized.
[0052]
As described above, the wedge-shaped insertion material joint of the present invention is a joint that fixedly couples a frame material of a cabin mounted on a working vehicle such as a construction machine or an agricultural machine, and can cope with a sturdy frame material. Moreover, it provides an inexpensive and powerful joint method.
[0053]
Although not particularly specified in the above embodiment, the wedge-shaped inserts 10a and 10c may be driven by applying a polyurethane adhesive or the like. In addition, the wedge shape also has a wedge shape as long as it has a shape that fills a gap as an insert, that is, any shape as long as its cross section is one thin and one is thick. Or any size or length. Further, the shape of the column is not limited to the U-shape shown in the above embodiment, but has a hollow at a substantially central portion, such as a square tube or a round tube, depending on the use or the shape of the decorative cover material 3, and the joint body is inserted. Any shape is possible as long as it can be made. For example, a column (U-shape) indicated by 2 in FIG. 6A and having a small springback error is selected, and a press member indicated by 3d and 3e is welded and attached as shown in FIG. 6B. However, the same effects as in the above embodiment can be obtained even if what is shown in FIG. 5C is changed. That is, the present invention is not limited to the above embodiments, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
[0054]
【The invention's effect】
According to the present invention, it is possible to provide a strong and inexpensive joint material that can accurately join the columns with each other and withstand a relatively large impact without depending on a model, a part, a coupling angle, or the like.
[Brief description of the drawings]
FIG. 1A is a perspective view showing an embodiment of the present invention, and FIG.
FIG. 2 is a side view showing the principle.
FIG. 3 is a side view showing the joint.
FIGS. 4A and 4B are conceptual views showing frame members.
FIGS. 5A, 5B and 5C are cross-sectional views showing the frame member.
6A is a perspective view showing another frame member, and FIG. 6B is a cross-sectional view.
FIG. 7 is a perspective view showing a conventional example.
FIG. 8 is a sectional view of another joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wedge-shaped rib material 2 Prop material 3 Decorative cover material 7, 7a, 7b Frame material 10 Joint 10a, 10b, 10c, 10d Insert material 10e Joint body

Claims (3)

A joint for fixedly connecting a frame material of a cabin mounted on a working vehicle such as a construction machine or an agricultural machine,
A frame material provided with a strut that has been subjected to a bending process and has a cavity in a substantially central portion,
A joint body that is inserted into the cavity of the column and fixedly couples the frame members to each other;
Having a substantially wedge-shaped insertion material arranged in the insertion portion of the joint body,
A wedge-shaped joint with a wedge-shaped insert, wherein the struts are joined by disposing an insert having a different wedge angle in the joint insertion portion according to an assembling angle of the frame material. The wedge-shaped insertion material joint according to claim 1, wherein insertion materials having the same wedge angle and different thicknesses are arranged on opposite surfaces of the joint insertion portion so as to face each other in opposite directions. The joint angle Rh of the joint body is set to be larger than the insertion angle Ri between the columns, and the insertion material inserted on the side located outside is shaped such that the tip becomes thinner toward the inside of the column. The wedge-shaped insertion member joint according to claim 1 or 2, wherein the joints are driven into each other to join the columns.

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