KR-102964204-B1 - Jig Apparatus for Cold Joining of an Axle Housing

Abstract

The present invention relates to a jig device for cold joining of an axle housing to which a cold press or cold welding process is applied, wherein the device minimizes positional deviation and improves quality during joining by precisely supporting and fixing complex shaped parts, such as a central installation part and an extension tube, in the front, rear, up, down, left, and right directions, and is flexibly applicable to axle housings of various specifications based on an automation-compatible design including a linear unit, hydraulic or pneumatic cylinder, and a pressure jig, and can be widely utilized in the manufacturing processes of various industrial vehicles such as commercial vehicles, high-speed vehicles, heavy equipment, and military vehicles, thereby maximizing convenience or efficiency of use due to ease of handling, use, maintenance, and repair derived from a structure differentiated from existing ones. The device comprises: a first fixing unit (100) that supports and fixes the upper, lower, front, and rear of the central installation part (1a) of the axle housing in which a gear set is embedded; and a jig device formed on each of the left and right sides of the installation part. It is composed of a second fixing unit (200) that supports and fixes the upper and lower parts and the front and rear parts of the extension tube (1b); and a frame (300) that accommodates the first fixing unit and the second fixing unit.

Inventors

• 최금성
• 김승진
• 김주석

Assignees

• 평안정공주식회사

Dates

Publication Date

20260513

Application Date

20250717

Claims (3)

1. A jig device for cold joining of an axle housing, which enables precision welding by supporting and fixing an upper housing and a lower housing that are symmetrically divided, comprising: a first fixing unit (100) that supports and fixes the upper, lower, and front and rear portions of a central installation portion (1a) of an axle housing in which a gear set is housed; a second fixing unit (200) that supports and fixes the upper, lower, and front and rear portions of extension tubes (1b) formed on each of the left and right sides of the installation portion; and a frame (300) that accommodates the first fixing unit and the second fixing unit. The first fixed unit (100) comprises: an installation load jig (110) that is installed to be movable forward and backward on a frame (300) and supports the lower part of an installation part (1a); an installation upper jig (120) that is positioned on the upper part of an axle housing by means of an auxiliary frame (320) installed on the frame, is capable of moving forward and backward and up and down via a linear unit and a cylinder, and pressurizes, supports, and fixes the upper part of the installation part positioned on the installation load jig; an installation part front prevention jig (130) that is positioned in front of the installation load jig and limits the front position of the axle housing; an installation part rear prevention jig (140) that is installed through a cylinder at the rear of the installation load jig and simultaneously supports and fixes the rear side while pressing the axle housing against the installation part front prevention jig; and a unit positioned on both the left and right sides of the installation load jig that supports the lower boundary of the installation part and the extension pipe (1b) through an up and down movement. Includes an installation auxiliary jig (150); The above-mentioned installation load jig (110) is formed by: a first linear unit (111) installed to enable forward and backward linear movement at the center of the upper surface of the frame (300); a first support member (112) installed on the upper part of the first linear unit; a plurality of first lower jigs (113) arranged in a circular shape on the upper part of the first support member to match the outer shape of the installation part (1a); and an installation part support plate (114) arranged on the upper part of the first lower jigs to support the bottom surface of the installation part. The installation part (1a) is fixed with a multi-point and multi-faceted support structure to prevent alignment errors and warping that may occur during cold joining. The first lower jig (113) includes a plurality of support protrusions or pads arranged in a circular or curved shape on the upper part of the first support member (112). The above installation jig (120) comprises: a second linear unit (121) installed to be capable of forward and backward linear movement on the upper end of an auxiliary frame (320); a second support (122) installed on the upper end of the second linear unit; a bracket (123) installed on the upper end of the second support; a third support (124) installed on the upper end of the bracket; a first cylinder (125) installed vertically on the front end of the third support; and a first pressure jig (126) mounted on the rod of the first cylinder to press and fix the upper end of the installation part (1a).
2. In paragraph 1, The above first fixed unit (100) is, An installation load jig (110) installed to be movable forward and backward on a frame (300) and supporting the lower part of the installation part (1a); An installation upper jig (120) that is positioned at the top of the axle housing by means of an auxiliary frame (320) installed on the frame, and is capable of moving forward, backward, and up and down through a linear unit and a cylinder, and presses, supports, and fixes the upper part of the installation part positioned on the installation lower jig; An installation front prevention jig (130) positioned in front of the installation load jig to limit the front position of the axle housing; An installation rear support (140) that is installed at the rear of the installation load jig via a sullion to press the axle housing against the installation front support, while simultaneously supporting and fixing the rear side; Installation auxiliary jig (150) positioned on both the left and right sides of the installation load jig and supporting the lower boundary of the installation part and the extension pipe (1b) through a lifting motion; A jig device for cold joining of an axle housing including
3. In paragraph 1, The above second fixed unit (200) is, An extension tube bottom jig (210) that supports the bottom of each extension tube (1b); An extension tube front jig (220) positioned in front of the extension tube lower jig to limit the front position of the axle housing; An extension tube fixing jig (230) installed at the rear of the extension tube lower jig through a cylinder, which simultaneously supports and fixes the rear and upper surfaces while pressing the extension tube against the extension tube front jig; A jig device for cold joining of an axle housing including

Description

Jig Apparatus for Cold Joining of an Axle Housing The present invention relates to a jig device that supports the precise joining of an upper housing and a lower housing having a left-right split structure during the manufacturing process of an axle housing included in an axle device for automobiles, trucks, special purpose vehicles, etc. More specifically, in the joining process of an axle housing where a cold press or cold welding method is applied, the device precisely supports and fixes complex shaped parts, such as a central installation part and an extension tube, in the front-rear, up-down, left-right directions, thereby minimizing positional deviation during joining and improving quality. Furthermore, based on an automation-compatible design including a linear unit, hydraulic or pneumatic cylinder, and a pressure jig, it can be flexibly applied to axle housings of various specifications and widely utilized in the manufacturing processes of various industrial vehicles such as commercial vehicles, high-speed vehicles, heavy equipment, and military vehicles. It maximizes convenience or efficiency of use due to ease of handling, use, maintenance, and repair derived from a structure differentiated from existing ones. This relates to a jig device for cold joining of an axle housing. Typically, an axle housing is an undercarriage structure designed to protect the vehicle's axle shaft from external impacts and loads, and to reliably transmit driving torque to the wheels; its durability and precision are considered critical, particularly in commercial vehicles, special-purpose vehicles, and military vehicles. Traditionally, axle housings are manufactured by dividing them into an upper housing and a lower housing with a left-right symmetrical split structure rather than a single formed structure, and then joining them to complete a single integrated structure. At this time, welding, riveting, or the recently popular cold joining method are utilized for joining. Cold joining is suitable for assembling high-strength materials or high-precision parts as it minimizes thermal deformation and enhances structural integrity, but it has the disadvantage of being highly sensitive to relative alignment errors of the parts. Consequently, if parts such as the relative position of the upper and lower housings, the central mounting section (gear set mounting section), and the extension tubes on both sides are not precisely fixed and supported, serious quality problems such as gear offset, power transmission imbalance, and increased vibration occur after housing joining. To solve these problems, jig devices have been developed to assist in the alignment of parts when joining axle housings. In particular, there has recently been an increasing demand for precision jig devices suitable for automated production lines, including linear units, hydraulic/pneumatic cylinders, and multi-faceted fixing parts. For example, prior art is disclosed in Registered Patent Publication No. 10-2449604, "Assembly Jig for Robot Drive System Including Harmonic Drive," which describes a multi-stage jig for aligning and fixing a harmonic drive module and a shaft assembly, configured to enable precision assembly through radial and axial pressure. However, the main configuration of the above-mentioned conventional technology is for aligning rotating parts, and it cannot simultaneously fix the central mounting part and the extension tube in multiple directions or guarantee corresponding support for the axle housing in the up, down, left, right, front, and rear directions, and it also limits support for larger structures and integration of automation lines. In addition, another prior art is disclosed in Registered Utility Model Publication No. 20-0442000, "Clamp Structure for Assembly Jig," which is a structure that secures fixation using a clamping method during module assembly; it is primarily used for the assembly of general structures and plates and includes a hydraulic and pneumatic-based pressurized structure. However, the clamp method of the aforementioned conventional technology fails to provide the integrated support function in the front, back, up, down, left, and right directions required for cold joining, and also lacks the function of separate fixing for individual parts based on the structural characteristics of the extension tube. The above-mentioned conventional technology provides partial fixing functions, but it does not meet the requirements for overall oriented multifaceted fixing and cold bonding quality improvement aimed at the present invention. Therefore, it is time to provide practical solutions for opening and quality issues by achieving technological advancements such as multi-faceted precision fixing, automatic alignment support, and modularization support, which conventional technologies could not provide. FIG. 1 is a perspective view of a jig device configured according to a preferred embodiment of the present invention. FI