JP2010100110A - Axle case structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axle case structure for fillet-welding an annular plate member for mounting a brake fitted to a cylinder part of a butt-welded axle case to the cylinder part by dividing the annular plate member into a plurality of divided pieces. <P>SOLUTION: The annular plate member 4 is constituted of the plurality of divided pieces 4A and 4B. The divided pieces 4A and 4B are set to a range of not exceeding 180°, in a contact range with the cylinder part 3 of the axle case, and the divided pieces 4A and 4B are made to be along an outer periphery of the cylinder part 3 and are fillet-welded to be a brake flange. When a cut-out hole 6 to avoid excess metal of a butt-welded part 7 is formed in the annular plate member 4, a clearance between the cut-out hole 6 and the excess metal of the welded part 7 is formed to be longer in an outer peripheral direction as compared with a radial direction of the cylinder part 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an axle case structure in which an annular plate member for mounting a brake that fits into a cylindrical portion that serves as an axle housing of an axle case such as a truck is divided into a plurality of parts and welded to the cylindrical portion.

As shown in FIG. 5, the vehicle axle case 11 includes a differential accommodating portion 12 in which a differential mechanism is accommodated, and a pair of cylindrical portions 13 that extend to the left and right to accommodate an axle and serve as an axle housing. .
The left and right cylindrical portions 13 are fitted with brake flanges 14 of annular plate members for mounting brakes, and at least one side surface of each brake flange 14 is a corner along the circumferential direction on the outer peripheral surface of the cylindrical portion 13. A structure integrated by meat welding is common.
Here, the axle case 11 is formed by butt-welding sheet metal press products (upper and lower members) divided substantially symmetrically in the vertical direction.
At this time, since the brake torque holding force of the brake flange 14 depends on the quality of the fillet weld, the inner peripheral surface 15 at the center of the brake flange 14 is finished with a lathe or the like (not shown). The extra bead of the butt welds 17 of the upper and lower members must be cut, and a large work man-hour is required.
On the other hand, as shown in FIGS. 6 and 7, a notch hole 16 is formed on the inner peripheral surface 15 of the brake flange 14 so as to expand the hole corresponding to the butt welding portion 17 of the upper and lower members 13A and 13B. Although the removal work of the bead surplus of the part 17 is abolished, the surplus bead 18a of the fillet welded part 18 overlaps the bead 17 of the butt weld part more than the surplus 18a 'in the other part. It swells in the radial direction (see FIG. 7).
Therefore, when the step 19 serving as a positioning guide at the time of mounting the brake is machined to the outside in the deformation direction of the welded portion after the brake flange 14 is welded, the cutting tool uses the surplus 18a of the fillet welded portion 18 or its swelling. Interfering with the protruding part, the cutting tool may be chipped and cutting defects may occur.
In any case, the integrally constructed brake flange 14 needs to be inserted from the end side of the axle case. Normally, the end portion of the axle case to which the vehicle spindle is welded and the cylindrical portion 13 that fits the brake flange are fitted. Since the outer diameters are equal, there is a restriction on the assembly order in which the brake flange must be fitted before the spindle is welded so that the bead buildup when the spindle is welded does not interfere with the insertion of the brake flange.
In addition, there is a design restriction that requires that the diameter of the spindle weld, which is one of the severe parts, be the same as or less than that of the brake flange weld.
JP 2008-183569 A

In this invention, since the brake flange is formed of an annular plate member made up of a plurality of divided pieces, insertion from the end of the axle case is not required at the time of attachment to the cylindrical portion serving as the axle housing, so the brake flange is assembled. Therefore, it is possible to abolish the bead surplus removal work at the butt welds of the upper and lower members of the axle case.
Further, the outer shape of the wheel spindle welded portion, which is severe in strength, can be made larger than the outer shape of the flange mounting portion, and the durability of the same portion can be improved.

In order to solve the problem, the invention of claim 1
In the axle case structure in which the annular plate member for attaching the brake is fitted to the cylindrical portion of the axle housing provided in the axle case and is fillet welded,
The annular plate member is composed of a plurality of divided pieces,
The divided piece is set in a range in which a contact range with the cylindrical portion does not exceed 180 degrees.
In the invention of claim 2,
The division position of the annular plate member is set substantially horizontally.
Furthermore, in the invention of claim 3,
The cylindrical part has a butt weld part that is welded by butt-welding the members divided substantially symmetrically up and down, leaving a surplus,
In the inner surface of the annular plate member, at a position facing the surplus, a notch hole for releasing the surplus is provided,
A gap formed between the notch hole and the extra portion of the welded portion is formed longer in the outer peripheral direction than the radial direction of the cylindrical portion,
When the annular plate member is fillet welded to the cylindrical portion, the surplus is released into a gap in the outer circumferential direction, and the swelling of the surplus formed in the radial direction is suppressed to a low level.
In the invention of claim 4,
The notch hole is characterized in that the outer circumferential width of the cylindrical portion is set in a range of 1.5 to 2 times the width of the extra bank.
In the invention of claim 5,
The divided pieces have a common shape.

Since the annular plate member for mounting the brake is divided into a plurality of pieces and welded to the cylindrical portion from the outside, it is not necessary to insert the annular plate member from the end portion of the axle case, and the assembly workability is improved. In addition, it is not affected by the assembly order of the spindle or welding.
Further, conventionally, the bead of the butt welds of the upper and lower members constituting the axle case had to be removed not only by the welded part of the annular plate member but also by all the insertion paths from the end part. On the other hand, it is only necessary to remove the excess bead from the butt weld at the flange welding point, thereby saving work man-hours.
Further, if a notch hole is provided in the vicinity of the butt weld on the inner peripheral surface of the annular plate member and the shape is such that the weld bead does not interfere even if the bead is not cut, the butt weld in the flange weld is provided. The removal work of the bead surplus of the part can also be omitted.
If the width dimension of the notch hole is set larger than the width of the bead, the radial expansion of the bead after the annular plate member is welded to the cylindrical body can be reduced, and the brake is applied after the annular plate member is welded. Interference between the cutting tool and the welding bead when cutting the positioning guide or the mounting surface can be prevented.

  In the present invention, an annular plate member for mounting a brake is composed of a plurality of divided pieces, and fillet welded to a cylindrical portion of an axle case, so that the inside of the hollow portion of the shape change portion in the width direction or the vertical direction is formed on the side member of the vehicle frame. By fixing the reinforcing member with, the assembly workability was improved and the man-hours were reduced.

Hereinafter, an embodiment in which the axle case structure of the present invention is applied to an axle case of a truck will be described with reference to FIGS.
The main body of this axle case is the same as that of the prior art, and is constructed by butt-welding sheet metal press products (upper and lower members) divided substantially vertically in the vertical direction.
An annular plate member 4 for attaching a brake is integrally attached to a pair of left and right cylindrical portions 3 that serve as axle housings by accommodating an axle (see FIG. 5).

Here, the said cylindrical part 3 consists of a part of upper-lower member 3A, 3B, and is integrally formed by butt welding.
The butt weld 7 is formed by cutting the surplus portion 7a only at the flange welded portion 30 of the cylindrical portion 3 and processing it into a surface substantially continuous with the outer peripheral surface of the cylindrical portion 3, as in the conventional case. There is no need to cut off the surplus from the flange to the welded part.

In the case of the present embodiment, the annular plate member 4 is composed of divided pieces 4A and 4B that are divided into two in the vertical direction with the contact range with the cylindrical portion 3 set to 180 degrees, the divided position set horizontally.
Here, since the divided pieces cannot be fitted into the cylindrical portion 3 from the outside when exceeding 180 degrees, it is necessary to set the divided pieces within a range not exceeding 180 degrees.

Further, the divided pieces can be shared by setting the contact range with the cylindrical portion at equal intervals, but in the present invention, the angle of the contact range may be different, and the number of divisions is an even number, Any of odd numbers may be used.
In the case of the illustrated example, the division position of the annular plate member 4 is set to be substantially horizontal corresponding to the upper and lower members 3A, 3B of the axle case, but is not limited to this.

  In the present embodiment, the divided pieces 4A and 4B are attached to the outer peripheral surface of the cylindrical portion 4 composed of the upper member 3A and the lower member 3B at the location where the extra-strip 7a is scraped off at the flange welding location 30 of the cylindrical portion 3. It fits from the outside and is welded by fillet welding along the outer peripheral direction of the cylindrical portion 3 to form the fillet welded portion 8.

  Since the bead of the fillet welded portion 8 is welded in an annular shape on the substantially same circumference along the outer periphery of the cylindrical portion 3, the surplus does not become large irregularities, and the brake positioning guide and the mounting surface 9 are cut. Sometimes there is no interference between the cutting tool and the fillet weld 8 bead.

In the axle case structure of the second embodiment shown in FIGS. 3 and 4, the annular plate member 4 is formed with a notch 6 for escaping the bead surplus 7 a of the butt weld portion 7.
Further, in the butt welding portion 7 of the upper and lower members 3A and 3B corresponding to the cylindrical portion 3, the extra work 7a is not removed, so that the work of removing the extra weld bead can be omitted.

  The annular plate member 4 is made up of divided pieces 4A and 4B that are divided into two parts in the same manner as in the above-described embodiment, and a pair of notch hole-forming recesses 6a are formed on both end sides of one divided piece 4A. A pair of cutout hole-forming recesses 6b are formed on both ends of the divided piece 4B. In this embodiment, the divided pieces 4A and 4B have the same shape. And the said notch hole structure recessed part 6a and 6b is combined, and the one notch hole 6 is formed.

In the cutout hole 6, a gap S formed between the cutout hole 6 and the surplus weld 7 a of the butt weld portion 7 of the cylindrical portion 3 is formed longer in the outer peripheral direction than the radial direction of the cylindrical portion 3. .
As a result, when the split pieces 4A and 4B of the annular plate member 4 are fillet welded to the cylindrical portion 3 in the same manner as in the first embodiment, the surplus that is swelled in the radial direction is released to the gap in the outer circumferential direction. Thus, it is possible to suppress the bulge of the extra-bead 8a of the fillet weld 8 formed in the radial direction.
In addition, 8a 'in a figure is the surplus of the bead formed in the inner peripheral surface 5 side other than the notch part 6. FIG.

Accordingly, it is possible to prevent interference between the cutting tool and the bead of the fillet weld portion 8 when the brake positioning guide or the mounting surface 9 is cut after welding.
The notch hole 6 preferably has a relief width L2 set to about 1.5 to 2 times the width L1 of the butt weld bead of the upper and lower members 3A and 3B in consideration of securing the weld leg length and the like. (See FIG. 3B).
The radial gap L3 between the cutout hole 6 and the outer peripheral surface of the cylindrical portion 3 is substantially the same as the gap L4 between the inner peripheral surface 5 excluding the cutout hole 6 of the annular plate member 4 and the outer peripheral surface of the cylindrical portion 3. It is.

In the said Example, although the case where the cyclic | annular board member was equally divided into the up-down direction was illustrated, three or more division | segmentation numbers may be sufficient and it does not need to be equal division.
Further, the division position is not limited to horizontal, but may be vertical, or a position inclined with respect to a horizontal plane or a vertical plane.

In any case, it is necessary to consider that the division positions are arranged between the brake mounting holes 10.
Moreover, in any case, as a matter of course, if the angle (occupied angle) of the contact range with respect to the cylindrical portion of the two divided pieces is 180 degrees as in this embodiment, the two divided pieces have a common shape.

If necessary, the divided portions of the annular plate member may be butt welded.
In this case, it is desirable to weld the back side of the brake mounting surface that can ensure the flatness around the bolt hole.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

It is sectional drawing which shows the attachment state of the annular plate member of the axle case structure of Example 1. FIG. It is principal part sectional drawing which shows the welding part of the annular plate member of FIG. It is a figure which shows the attachment state of the cyclic | annular board member of Example 2, (a) is the sectional drawing, (b) is an enlarged view of a notch hole. It is principal part sectional drawing which shows the welding part of the annular plate member of FIG. It is a perspective view of the conventional axle case made of sheet metal. It is sectional drawing which shows the attachment state of the brake flange which has a conventional notch hole. It is principal part sectional drawing which shows the welding part of the brake flange of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Cylindrical part 4 Annular plate member 4A, 4B Split piece 5 Fitting hole 6 Notch hole 7 Butt weld part 8 Fillet weld part 11 Axle case 12 Differential accommodating part 13 Cylindrical part 14 Brake flange 15 Fitting hole 16 Notch hole 17 Butt Weld bead 18 fillet weld bead 19 step

Claims (5)

In the axle case structure in which the annular plate member for attaching the brake is fitted to the cylindrical portion of the axle housing provided in the axle case and is fillet welded,
The annular plate member is composed of a plurality of divided pieces,
The axle case structure, wherein the divided piece is set in a range in which a contact range with the cylindrical portion does not exceed 180 degrees.   The axle case structure according to claim 1, wherein a division position of the annular plate member is set substantially horizontally. The cylindrical part has a butt weld part that is welded by butt-welding the members divided substantially symmetrically up and down, leaving a surplus,
In the inner surface of the annular plate member, at a position facing the surplus, a notch hole for releasing the surplus is provided,
A gap formed between the notch hole and the extra portion of the welded portion is formed longer in the outer peripheral direction than the radial direction of the cylindrical portion,
2. When the annular plate member is fillet welded to the cylindrical portion, the surplus is released into a gap in the outer peripheral direction, and the swelling of the surplus formed in the radial direction is suppressed to a low level. Or the axle case structure of 2.   4. The axle case structure according to claim 3, wherein the cutout hole has a width in an outer peripheral direction of the cylindrical portion set in a range of 1.5 to 2 times a width of the extra bank.   The axle case structure according to any one of claims 1 to 4, wherein the divided pieces have a common shape.

Images