Special alignment heptagonal tool positioning structure

Abstract

The utility model discloses a heptagonal tool positioning structure for special alignment, and belongs to the technical field of engine alignment positioning tools. A heptagonal tool positioning structure is arranged on the camshaft body, the heptagonal tool positioning structure comprises a surface A, a surface B and a surface C, the surface A and the surface B are parallel to each other, the surface C is adjacent to the surface A and the surface B, and a two-dimensional code used for tracing the machining process is arranged on the surface C. According to the heptagonal tool positioning structure for special alignment, through the advantages of accurate positioning, reliable assembly, traceable quality, production optimization, product reliability, high adaptability and the like, the product quality, the production efficiency and the market competitiveness are effectively improved, and a powerful guarantee is provided for related production of camshafts.

Description

Technical Field

[0001] This utility model belongs to the field of engine timing positioning fixture technology, specifically a special heptagonal timing positioning fixture structure. Background Technology

[0002] In the field of engine manufacturing, traditional pin-hole timing technology is widely used as a common method to ensure the correct phase relationship between the camshaft and the crankshaft. This technology achieves the advantages of simple structure, low manufacturing cost and easy implementation by machining precisely matched pin holes on components such as the camshaft and crankshaft and inserting locating pins to fix their relative positions.

[0003] However, in actual mass production, especially for high-performance engines or production scenarios with extremely high requirements for phase accuracy, the limitations of traditional pin holes for timing technology gradually become apparent. Due to the limitations of the precision of the processing equipment, there may be slight deviations in the processing position of each pin hole. During the assembly process, it is also difficult to achieve absolute precision in the insertion angle and depth of the locating pin. These factors cause small errors to accumulate continuously in mass production. As the production quantity increases, the cumulative deviation of the phase angle becomes more and more obvious. Once this deviation exceeds the allowable range, it will directly interfere with the coordinated work of the camshaft and crankshaft, thereby affecting the engine's working efficiency, emission levels, and running stability.

[0004] To effectively address the aforementioned issues and meet the stringent requirements for phase accuracy in the production of high-performance engines, there is an urgent need in related fields to explore more precise and reliable timing technologies. Summary of the Invention

[0005] To address the problems existing in the background technology, this utility model provides a special heptagonal tooling positioning structure for alignment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a special heptagonal tooling positioning structure for alignment, comprising a camshaft body, a heptagonal tooling positioning structure, surface A, surface B, and surface C;

[0007] The camshaft body is provided with a heptagonal tooling positioning structure, which includes mutually parallel surfaces A and B, and a surface C adjacent to surfaces A and B. A QR code for traceability of the processing is provided on surface C.

[0008] The A and B surfaces are precision machined to have a surface roughness ≤ Ra3.2μm and a parallelism error ≤ 0.05mm. The angle tolerance between the A and B surfaces and the center line of the cam tip on the camshaft body is ±20′, and the positioning dimension tolerance between the A and B surfaces is ±0.05mm.

[0009] The QR code on the C-side contains information about the processing batch, processing parameters, and assembly station of the camshaft body.

[0010] The heptagonal tooling positioning structure is integrally manufactured with the camshaft body, or it can be detachably assembled onto the camshaft body.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. Precise positioning: Surfaces A and B are precision machined with a surface roughness ≤ Ra3.2μm and a parallelism error ≤ 0.05mm. The positioning dimension tolerance is ±0.05mm, which ensures the lateral positioning accuracy and accurate matching with components such as press-fitting fixtures, reducing positioning errors.

[0013] 2. Reliable assembly: The angle tolerance between surface A and surface B and the center line of the camshaft tip is ±20′. This precise angle is machined by high-precision equipment, which ensures accurate phase after camshaft assembly, ensures normal engine operation, and improves assembly quality.

[0014] 3. Quality Traceability: The QR code on the C-side records information such as processing batch, parameters, and assembly station, with processing parameters linked in real time. In case of quality issues, scanning the QR code allows for quick access to information throughout the entire process, accurately pinpointing the problem area and facilitating improvements.

[0015] 4. Production optimization: With the help of QR code information, the production process can be monitored and managed in real time, potential problems can be identified in time, production processes can be optimized, efficiency can be improved and costs can be reduced.

[0016] 5. Product Reliability: High-precision positioning assembly and a comprehensive quality traceability system reduce product failures, improve reliability and service life, and enhance market competitiveness.

[0017] 6. High adaptability: The heptagonal tooling positioning structure and the camshaft body can be integrally formed or disassembled and assembled, flexibly adapting to different production needs and process requirements.

[0018] In summary, this special timing heptagonal tooling positioning structure effectively improves product quality, production efficiency, and market competitiveness through its advantages in precise positioning, reliable assembly, quality traceability, production optimization, product reliability, and strong adaptability, providing a strong guarantee for camshaft-related production. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0021] This embodiment describes a special heptagonal tooling positioning structure for timing alignment, including a camshaft body 1, a heptagonal tooling positioning structure 2, surface A 3, surface B 4, and surface C 5.

[0022] The camshaft body 1 is provided with a heptagonal tooling positioning structure 2. The heptagonal tooling positioning structure 2 includes mutually parallel surfaces A 3 and B 4, and a surface C 5 adjacent to surfaces A 3 and B 4. A QR code for traceability of the processing is provided on surface C 5.

[0023] The surfaces A3 and B4 are precision machined to have a surface roughness ≤ Ra3.2μm and a parallelism error ≤ 0.05mm. The angle tolerance between the surfaces A3 and B4 and the center line of the cam tip on the camshaft body 1 is ±20′, and the positioning dimension tolerance between the surfaces A3 and B4 is ±0.05mm.

[0024] The QR code on surface C5 contains the processing batch, processing parameters, and assembly station information of the camshaft body 1.

[0025] The heptagonal tooling positioning structure 2 is integrally manufactured with the camshaft body 1, or is assembled onto the camshaft body 1 in a detachable manner (such as bolt connection, snap-fit ​​connection, etc.).

[0026] The A and B surfaces of the heptagonal tooling positioning structure are precision machined (e.g., ground on a five-axis grinding machine). Surfaces A and B are parallel to each other, with a surface roughness ≤ Ra3.2μm and a parallelism error ≤ 0.05mm. Real-time detection using a coordinate measuring machine ensures the absolute flatness of surfaces A and B on the macroscopic plane, avoiding positioning deviations caused by plane warping. During assembly, the press-fitting fixture uses surfaces A and B as positioning references, with a dimensional tolerance of ±0.05, precisely defining the relevant positioning dimensions. This ensures the lateral positional accuracy of the heptagonal tooling positioning structure, guaranteeing accurate fit with components such as the press-fitting fixture, and avoiding assembly errors caused by planar deviations.

[0027] The tolerance of the angle between surface A and surface B and the center line of the cam tip on the camshaft body is ±20′. This tolerance range is determined comprehensively based on the engine valve timing accuracy requirements and the precision capability of the machining equipment. This precise angle is set according to the engine valve timing requirements. When machining the heptagonal tooling positioning structure, high-precision machining equipment is used to ensure the accuracy of this angle, so that after the camshaft is assembled, the phase of the cam can be precisely matched with the phase of the crankshaft, ensuring accurate valve opening and closing times and ensuring normal engine operation.

[0028] The camshaft body and phaser are assembled using a press-fit fixture. During assembly, the camshaft body is first placed into the press-fit fixture, utilizing the high-precision planar positioning characteristics of surfaces A and B to ensure a tight fit with the fixture's positioning surfaces, guaranteeing the correct position of the camshaft in the fixture. Next, the press-fitting equipment is started and operated according to the set pressure and stroke. The preset pressure value is determined based on the interference fit between the camshaft body and the phaser, as well as the strength characteristics of the materials. The preset stroke value is determined based on the assembly dimensional requirements of the camshaft body and the phaser. During the press-fitting process, pressure and displacement sensors monitor the pressure and pressing stroke in real time. When the pressure and stroke reach the preset values, the phaser and camshaft are accurately assembled, ensuring that the relative phase accuracy of the two meets the design requirements.

[0029] The QR code can be encoded using the Data Matrix encoding method (an existing technology). This encoding method features high information density and strong fault tolerance, and can store a large amount of information in a small area. The QR code is generated using dedicated QR code generation software. During the generation process, the processing batch, processing parameters (such as processing equipment model, tool number, processing time, cutting speed, feed rate, etc.) and assembly station information of the camshaft body 1 are encrypted and then entered into the software to generate a QR code graphic. The generated QR code is then engraved on surface C 5 using a laser marking machine. When a product quality problem occurs, scanning the QR code can quickly obtain the pre-entered full-process information of the product, accurately locate the problem link, facilitate timely improvement measures, and also help with quality traceability and optimized management of the production process.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A specially timed heptagonal tooling positioning structure characterized by: It includes the camshaft body (1), the heptagonal tooling positioning structure (2), surface A (3), surface B (4) and surface C (5); The camshaft body (1) is provided with a heptagonal tooling positioning structure (2), which includes a parallel A surface (3) and a B surface (4), and a C surface (5) adjacent to the A surface (3) and the B surface (4). The C surface (5) is provided with a QR code for tracing the processing process.

2. A specially aligned heptagonal tool positioning structure at a time of alignment according to claim 1, characterized in that: The surface A (3) and surface B (4) are precision machined, with a surface roughness ≤ Ra3.2μm and a parallelism error ≤ 0.05mm. The angle tolerance between surface A (3) and surface B (4) and the center line of the cam tip on the camshaft body (1) is ±20′, and the positioning dimension tolerance between surface A (3) and surface B (4) is ±0.05mm.

3. A specially aligned heptagonal tool positioning structure according to claim 1, wherein: The QR code on the C-side (5) contains the processing batch, processing parameters and assembly station information of the camshaft body (1).

4. A specially aligned heptagonal tool positioning structure at a time of alignment according to claim 1, characterized by: The heptagonal tooling positioning structure (2) and the camshaft body (1) are manufactured as a single unit, or are assembled onto the camshaft body (1) in a detachable manner.

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