A steering arm spline clamp

Abstract

This utility model proposes a steering arm spline fixture, which relates to the field of process equipment technology. It solves the problem of poor angle positioning accuracy of existing fixtures. The proposed solution is to provide a steering arm spline fixture, including a tooling body (1) with laser-printed horizontal engravings, a rotating plate (2) with several laser-printed engravings, the rotating plate (2) and the tooling body (1) being fitted with a clearance fit; a positioning plate (3) connected to the rotating plate (2), the positioning pin (4) being movable and adjustable within the groove of the positioning plate (3); a hemispherical joint bearing (5) with an interference fit between the tooling body (1) and the positioning shaft (7) with an interference fit between the hemispherical joint bearing (5); and a pressure cap (6) fixed to the tooling body (1). This solution can eliminate errors caused by equipment, ensure product quality, and improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of process equipment technology, and in particular to a steering arm spline clamp. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the present invention set forth in the claims. The description herein may include concepts that may be explored, but not necessarily concepts that have been previously conceived or explored. Therefore, unless otherwise stated, the content described in this section is not prior art for the purposes of this application's specification and claims, and is not acknowledged as prior art simply by virtue of its inclusion in this section.

[0003] A fixture is a device used in mechanical manufacturing to fix a workpiece in the correct position for machining or inspection; it is also called a clamp. Broadly speaking, any device used to quickly, conveniently, and safely install a workpiece at any stage of the manufacturing process can be called a fixture. A fixture typically consists of positioning elements (which determine the correct position of the workpiece within the fixture), clamping devices, tool setting and guiding elements (which determine the relative position of the tool and workpiece or guide the tool direction), indexing devices (which allow the workpiece to complete machining at several stations in a single setup; there are rotary indexing devices and linear indexing devices), connecting elements, and the fixture body (fixture base). Modern fixtures are developing towards speed, precision, and automation.

[0004] There are many methods for spline machining in the current machining industry, among which the most common methods are milling splines and broaching splines. Broaching splines are characterized by high efficiency and high precision, and are suitable for precision machining of involute internal splines in automotive transmission systems. The broaching machine fixture structure is relatively simple, and generally only requires rotational positioning of the part.

[0005] The broaching machine fixture currently used for machining steering arm splines only provides rotary positioning, with the workpiece end face directly contacting the machine flange face. Due to a certain error in the perpendicularity between the broaching machine flange end face and the machine spindle (broach), the runout between the broached spline and the workpiece flange end face is unacceptable, resulting in unstable spline quality and a high scrap rate. Furthermore, since steering arms have spline angle requirements, the existing fixture has poor angle positioning accuracy, requiring scribing adjustments, which leads to low efficiency in first-piece adjustment and poor quality assurance. Summary of the Invention

[0006] To address the problem of poor angle positioning accuracy in existing fixtures, the purpose of this invention is to provide a steering arm spline fixture.

[0007] To solve the above-mentioned technical problems, according to some embodiments, this utility model provides a steering arm spline clamp, comprising: Tooling body 1, which has laser-printed horizontal engraving lines on it. The rotating plate 2 has several laser-printed lines on it, wherein there is a line at 0.5 degrees interval and the line is at a certain angle to the horizontal line of the tooling body 1. The rotating plate 2 and the tooling body 1 are fitted with a shaft hole clearance fit. The rotating plate 2 can rotate around the tooling body 1. The positioning plate 3 is connected to the rotating plate 2. The positioning pin 4 can be moved and adjusted in the groove of the positioning plate 3. After adjustment, the positioning plate 3 is temporarily fixed on the rotating plate 2. The hemispherical plain bearing 5 is fitted with the tooling body 1 by an interference fit between the shaft and the bore; the positioning shaft 7 is fitted with the hemispherical plain bearing 5 by an interference fit between the shaft and the bore. The pressure cap 6 is fixed to the tooling body 1, and the pressure cap 6 is spaced apart from the positioning shaft 7.

[0008] Optionally, in some embodiments, the angle between the horizontal scribe line and the tooling body 1 is specified, specifically including: The specified angle is ±15 degrees.

[0009] Optionally, in some embodiments, the positioning plate 3 is temporarily fixed to the rotating plate 2, specifically including: The positioning plate 3 is temporarily fixed to the rotating plate 2 by a nut.

[0010] Optionally, in some embodiments, the positioning plate 3 is connected to the rotating plate 2, specifically including: The positioning plate 3 is connected to the rotating plate 2 by screws and positioning pins.

[0011] Optionally, in some embodiments, the pressure cap 6 is fixed to the tooling body 1, specifically including: The pressure cap 6 is fixed to the tooling body 1 with four screws.

[0012] Optionally, in some embodiments, the pressure cap 6 is spaced apart from the positioning shaft 7, specifically including: The pressure cap 6 and the positioning shaft 7 are separated by a compression spring 8.

[0013] Optionally, in some embodiments, the compression spring 8 has four components.

[0014] The above-mentioned technical solution of this utility model has at least the following beneficial technical effects: This utility model uses a special broaching fixture with adjustable positioning pins and hemispherical joint bearings for spline machining. The main body of the fixture and the broaching machine adopt an interference fit between the shaft and hole to ensure fitting accuracy, effectively solving the problem of poor fixture angle positioning accuracy. Before machining, the distance between the positioning pin and the spindle is adjusted and fixed according to the drawing requirements. At the same time, the scale of the rotary plate is adjusted according to the scribing angle requirements of the drawing. After adjustment, it is fixed with screws, the part is placed, and the broach is inserted for operation. When the broach is broaching, the hemispherical joint bearing begins to play an adaptive floating role, ensuring that the broach and the bottom hole are cut coaxially, eliminating errors caused by equipment, ensuring product quality, and improving production efficiency. This utility model is simple to manufacture, one set of fixtures can adapt to multiple products, has low production cost, strong versatility, and greatly improves production quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top view of a steering arm spline clamp provided in an embodiment of this utility model.

[0017] Figure 2 This is a front sectional view of a steering arm spline clamp provided in an embodiment of the present invention.

[0018] in, Figures 1 to 2 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-Main fixture; 2-Rotating plate; 3-Positioning plate; 4-Positioning pin; 5-Spherical joint bearing; 6-Pressure cover; 7-Positioning shaft; 8-Compression spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0021] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] The steering arm is an important component of the steering system assembly, and the steering arm spline is a crucial dimension connecting the steering arm and the steering gear. The spline dimensions have high requirements, especially the runout tolerance between the spline and the end face is small. To improve production efficiency and ensure production quality, a broaching process is used to machine the steering arm spline. Since there is a certain error in the perpendicularity between the flange end face of the broaching machine and the machine spindle (broach), this invention uses a hemispherical joint bearing adaptive mechanism to solve the problem caused by the non-perpendicularity between the broach and the machine (tooling), thus improving the production quality of the broached spline. Simultaneously, this invention features laser-printed engraving lines, one line every 0.5°, ensuring that the angle of the broached spline is qualified.

[0024] The following explanation is for reference only. Figures 1 to 2 As shown.

[0025] A steering arm spline clamp includes: Tooling body 1, which has laser-printed horizontal engraving lines on it. The rotating plate 2 has several laser-printed lines on it, wherein there is a line at 0.5 degrees interval and the line is at a certain angle to the horizontal line of the tooling body 1. The rotating plate 2 and the tooling body 1 are fitted with a shaft hole clearance fit. The rotating plate 2 can rotate around the tooling body 1. The positioning plate 3 is connected to the rotating plate 2. The positioning pin 4 can be moved and adjusted in the groove of the positioning plate 3. After adjustment, the positioning plate 3 is temporarily fixed on the rotating plate 2. The hemispherical plain bearing 5 is fitted with the tooling body 1 by an interference fit between the shaft and the bore; the positioning shaft 7 is fitted with the hemispherical plain bearing 5 by an interference fit between the shaft and the bore. The pressure cap 6 is fixed to the tooling body 1, and the pressure cap 6 is spaced apart from the positioning shaft 7.

[0026] The following is a detailed description: There is a laser-printed engraving line on the main body of the tooling, and several laser-printed engraving lines on the rotating plate 2. Specifically, there is one engraving line every 0.5°, which is ±15° from the horizontal engraving line of the main body of the tooling; the rotating plate 2 and the main body of the tooling are fitted with a shaft hole clearance fit, and the rotating plate 2 can rotate around the main body of the tooling. The positioning plate 3 is connected to the rotating plate 2 by two screws and two positioning pins. The positioning pins 4 can be moved and adjusted in the groove of the positioning plate 3. After adjustment, the positioning plate 3 can be fixed on the rotating plate 2 by using nuts. The hemispherical plain bearing 5 and the tooling body 1 are fitted with an interference fit between the shaft and the hole, and the positioning shaft 7 and the hemispherical plain bearing 5 are fitted with an interference fit between the shaft and the hole; The pressure cap 6 is fixed to the main body of the tooling 1 with 4 screws, and the pressure cap 6 is separated from the positioning shaft 7 by 4 compression springs 8.

[0027] When machining the steering arm spline, the fixture is fixed to the broaching machine. The main body of the fixture and the broaching machine adopt an interference fit between the shaft and the hole to ensure the fit accuracy. Before machining, the distance between the locating pin and the spindle is adjusted and fixed according to the drawing requirements. At the same time, the scale of the rotary plate is adjusted according to the scribing angle requirements of the drawing. After adjustment, it is fixed with screws. The fixture is adjusted, the part is placed on it, and the broach is inserted for working. When the broach is broaching, the hemispherical joint bearing 5 starts to play an adaptive floating role to ensure that the broach and the bottom hole are cut coaxially, eliminate errors caused by equipment, ensure product quality, and improve production efficiency.

[0028] In order to improve the precision and efficiency of spline machining, the current machining industry mostly uses broaching or rolling methods to process splines, thereby improving production efficiency while saving manpower and resources. This utility model uses a special broaching machine fixture with adjustable positioning pins and hemispherical joint bearings for spline machining. This utility model is simple to manufacture, one set of fixtures can be adapted to multiple products, has low production cost, strong versatility, and greatly improves production quality.

[0029] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A steering arm pull-key fixture, characterized by, include: The tooling body (1) has laser-printed horizontal lines on it. A rotating plate (2) has several laser-printed lines on it, wherein there is a line spaced 0.5 degrees apart, and the line forms a certain angle with the horizontal line of the tooling body (1). The rotating plate (2) and the tooling body (1) are fitted with a shaft hole clearance. The rotating plate (2) can rotate around the tooling body (1). The positioning plate (3) is connected to the rotating plate (2), and the positioning pin (4) can be moved and adjusted in the groove of the positioning plate (3). After adjustment, the positioning plate (3) is temporarily fixed on the rotating plate (2). The hemispherical spherical bearing (5) is fitted with the tooling body (1) by an interference fit between the shaft and the bore; the positioning shaft (7) is fitted with the hemispherical spherical bearing (5) by an interference fit between the shaft and the bore. The pressure cap (6) is fixed to the tooling body (1), and the pressure cap (6) is spaced apart from the positioning shaft (7).

2. The clamp according to claim 1, characterized in that, The angle between the horizontal scribed line and the tooling body (1) is a certain, specifically including: The specified angle is ±15 degrees.

3. The clamp according to claim 1, characterized in that, The positioning plate (3) is temporarily fixed on the rotating plate (2), specifically including: The positioning plate (3) is temporarily fixed to the rotating plate (2) by a nut.

4. The clamp according to claim 1, characterized in that, The positioning plate (3) is connected to the rotating plate (2), and specifically includes: The positioning plate (3) is connected to the rotating plate (2) by screws and positioning pins.

5. The clamp according to claim 1, characterized in that, The pressure cap (6) is fixed to the tooling body (1), specifically including: The pressure cap (6) is fixed to the tooling body (1) with four screws.

6. The clamp according to claim 1, characterized in that, The pressure cap (6) is spaced apart from the positioning shaft (7), specifically including: The pressure cap (6) and the positioning shaft (7) are separated by a compression spring (8).

7. The clamp according to claim 6, characterized in that, The compression spring (8) has 4 units.

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