JPS6240802Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an axle housing for a vehicle, more specifically a front axle housing for a forklift, which can be easily processed and assembled at low cost. The purpose is to

In general, an axle housing for a vehicle is composed of a main body consisting of a differential housing and a vehicle tube, and tube ends connected to both ends of the main body. For example, in the case of an axle housing for a forklift, the main body is manufactured by casting steel, and the tube end is manufactured by forging.

However, in the conventional cast steel main body, the mast support attachment part and the chassis assembly part were provided integrally with the main body, so machining them was troublesome and a special processing machine was required for the machining. I had to.

On the other hand, as shown in FIG. 3, bolting is generally used to connect the tube end to the main body. However, when bolting is used, the flange surface on the tube end side must be drilled, and the end surface on the main body side must be tapped, making the joining process extremely troublesome. It was hot. Further, a sealing material must be interposed on the joint surface to ensure oil tightness within the housing, and as a result, the cost is inevitably increased in addition to the above-mentioned drilling process.

As a method of connecting the tube end, there is a method in which the end of the tube end is inserted into the axle tube, and welding is performed between the tube end and the axle tube (for example, Japanese Patent Application Laid-Open No. 51-68023). .

A method of fixing the tube end and axle tube by friction welding.

Although the following connection methods have been proposed, a new problem arises in that they are unable to ensure sufficient accuracy.

The present invention is an attempt to improve the conventional situation in view of the above-mentioned actual situation, and the present invention is an attempt to improve the conventional situation by attaching the mast support attachment part and the chassis assembly part formed in the main body of the axle housing to the main body of the axle housing. The collar, which forms the mast support attachment part, and the bracket, which forms the chassis assembly part, are provided separately and are fixed to the main body by welding after each part is processed and finished. In addition, by connecting the tube ends to both end faces of the main body through press-fitting or welding, processing and assembly can be facilitated, and an inexpensive axle housing can be obtained. Its characteristics are:

That is, in the present invention, the main body is formed by a differential housing and a pair of axle tubes extending from the differential housing, and a mast support attachment portion and a chassis attachment portion are provided protruding from the outer peripheral surfaces of both axle tube portions. In the axle housing for forklifts, in which tube ends are connected to the ends of both axle tubes, a mast support mounting part and a shear seam assembly part are formed separately from the main body, and the mast support mounting collar and shear seam assembly are attached to the main body. A mounting bracket is provided separately, and the collar and bracket are finished, and then the collar is inserted into the axle tube, welded between the collar and the axle tube, and the same is applied. The base of the bracket is fixed to the outer peripheral surface of the collar by welding, while the base of the tube end is press-fitted into the end of the axle tube, and welding is performed between the tube end and the axle tube. The gist of this document is as follows.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings. 1 and 2, reference numeral 1 indicates the main body of the axle housing. The main body part 1 is formed by a differential housing 2 located at the center of the main body part 1, and a pair of left and right axle tube parts 3, 3 integrally extending from both left and right ends of the differential housing 2. Ru. Openings 4 and 4' are provided at both front and rear ends of the differential housing 2, and the front opening 4 is covered with a differential housing cover 5. Same differential housing cover 5
As shown in FIG. 2, it is formed in a substantially hemispherical dome shape, and its opening edge is fixed to the opening edge on the differential housing 2 side by welding. Further, a flange 6 is fixed to the rear opening 4' by welding. The flange 6 is formed in an annular shape so as to surround the opening 4', and mounting holes 6' are opened at regular intervals along the annular portion. Although not shown, a differential carrier is fixed to the flange 6 through the mounting holes 6'.

Reference numerals 7 and 7 denote collars constituting an attachment portion of a mast support (not shown), and the collars 7 and 7 are formed separately from the main body portion 1. The inner peripheral surfaces of the collars 7, 7 are formed to have a slightly larger diameter than the outer diameter of the axle tube portions 3, 3.

That is, as will be described later, when the collars 7, 7 are fitted into the axle tube portions 3, 3, there is a slight gap between the inner circumferential surfaces of the collars 7, 7 and the outer circumferential surfaces of the axle tube portions 3, 3. This is done so that a clearance a is formed.

A mounting groove 8 for a mast support and a recess 10 for mounting a bracket 9, which will be described later, are formed on the outer periphery of the collars 7, 7, respectively.

Reference numerals 9 and 9 indicate brackets constituting an assembly portion of a chassis (not shown);
Similar to the collars 7, 7, 9 is formed separately from the main body 1. The brackets 9, 9 are formed in a fan shape with an appropriate divergence angle from the base toward the outer periphery, and a suitable number of mounting holes 11 are opened at regular intervals along the outer periphery.

Therefore, when the collars 7, 7 are inserted into the axle tube portions 3, 3 of the main body portion 1, the axle tube portions 3, 3,
3, there is a slight clearance a between the lower side of the axle tube portions 3, 3 and the inner peripheral surface of the collars 7, 7, as shown in FIG.
so that it is formed. Then, the state in which the clearance a is formed on the lower side of the axle tube portions 3, 3 is restrained via an appropriate jig, and the collars 7, 7 are restrained against the axle tube portions 3, 3 in this manner. In this state, welding is performed on the top surfaces of the axle tube portions 3, 3.

In addition, a recess 1 formed on the outer peripheral surface of the collars 7, 7
0 and 10, the bases of the brackets 9 and 9 are welded together. The brackets 9, 9 are welded using the assembly holes 11, 1 opened in both brackets 9, 9.
A jig is placed between the two brackets 9, 9, so that the distance between the two brackets 9, 9 is restricted.

Reference numerals 13 and 13 denote tube ends, which are also formed separately from the main body portion 1. A brake flange 12 is fitted into the base of the tube ends 13, 13 and integrated by welding. Also the same tube end 13,1
Splines 14, 14 are carved at positions near the tip of 3.

The tube ends 13, 13 are forcibly press-fitted into both ends of the axle tube portions 3, 3, and the press-fitted portions are welded so as to be integrated.

The present invention is constructed as described above.
By having the structure as described above, it is possible to simplify the machining and assembly of the axle housing, and to obtain an inexpensive axle housing, compared to the conventional axle housing made of cast steel.

That is, in the present invention, the mast support attachment part is formed separately as a collar from the main body of the axle housing, and the bracket for assembling the chassis is also formed separately from the collar.
The collar and bracket are each finished at the component stage, and after each component is finished, they are integrated into the main body by welding, making assembly easier. I was able to do it. Furthermore, since the collar, bracket, and main body can be machined as individual parts, they can be machined without the need for dedicated processing machinery and equipment, and the processing efficiency can be increased. Furthermore, by providing the collar and bracket as separate parts to the main body as described above, the collar and bracket can be made of a material different from that of the main body, that is, a low-cost material. This has made it possible to improve the overall yield.

On the other hand, the tube ends are connected to both ends of the main body by press-fitting and welding, which makes the joining process easier and reduces costs compared to conventional bolted structures. It came to this. In other words, in the case of the joining method by press-fit welding, there is no need for drilling on the flange surface on the tube end side or tapping on the end surface on the main body side, so in addition to making the joining work easier, Assembling accuracy can be ensured through press-fitting, and there is no problem with sealing properties at the press-fitting or welding parts, and there is no need for a sealant to be inserted into the joints, making it possible to drill holes as described above. In addition to not requiring machining or tapping, this makes it possible to connect at an overall low cost.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view showing a partially cutaway state of an axle housing according to the present invention, and FIG. 2 is a sectional view of the same side. Moreover, FIG. 3 is a rear view showing an axle housing of a conventional structure. 1... Main body, 2... Differential housing, 3...
Axle pipe section, 4, 4'...Opening, 5...Differential housing cover, 6...Flange, 6'...Mounting hole, 7...Collar, 8...Mounting groove, 9...Bracket, 10... ...Mounting recess, 11... Assembly hole, 12... Brake flange, 13... Tube end, 14... Spline, a... Clearance.

Claims (1)

[Scope of utility model registration request] The main body is formed by a differential housing and a pair of axle tubes extending from the differential housing, and a mast support attachment portion and a chassis attachment portion are provided protruding from the outer peripheral surfaces of both axle tubes. An axle housing for a forklift comprising a tube end connected to the end of the forklift, and a mast support mounting part and a shear seam assembly part are formed separately from the main body, and a collar for mast support mounting and a shear seam assembling part are formed separately. A bracket for the axle is provided separately, a collar that has been finished with each part is fitted into the axle tube, welded between the collar and the axle tube, and finishing is applied to each part. The base of the bracket is fixed to the outer peripheral surface of the collar by welding, while the base of the tube end is press-fitted into the end of the axle tube, and welding is performed between the tube end and the axle tube. Axle housing made of