High-strength and easy-to-assemble rotor engine eccentric shaft capable of positioning bearing

Abstract

The invention discloses a high-strength and easy-to-assemble rotor engine eccentric shaft capable of positioning a bearing, and belongs to the technical field of rotor engine parts. An eccentric shaft neck is arranged on the eccentric shaft body, a plurality of lightening holes are formed in a non-key stress area of the eccentric shaft neck and used for reducing the mass of the eccentric shaft on the premise that the structural strength is not weakened, and a regular hexagonal structure is arranged at the front end of the eccentric shaft body and used for fixing the eccentric shaft body. The eccentric shaft neck is arranged on the eccentric shaft neck so as to tighten screws of the flywheel and related parts, two sides of the eccentric shaft neck are respectively provided with a circular bead, and the two circular beads are respectively attached to two end faces of the needle bearing to form an axial limiting structure which is used for limiting axial movement of the needle bearing and the retainer of the needle bearing. Through the synergistic effect of structural design and process optimization, the comprehensive effects that the eccentric shaft is high in strength, durable, light in weight, convenient to assemble and reliable in bearing positioning are achieved at the same time, the installation and maintenance difficulty of the rotor engine is lowered, and the operation stability and comprehensive performance of the whole machine are comprehensively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of rotary engine components, specifically a high-strength, easy-to-assemble, and positionable bearing eccentric shaft for rotary engines. Background Technology

[0002] The eccentric shaft is a core component of the rotary engine, bearing the pressure of high-pressure combustion gases, thus requiring extremely high structural strength and rigidity. At the same time, to ensure the overall quality meets standards, the eccentric shaft must meet strict weight reduction requirements. In addition, the eccentric shaft must also connect, support, and position the balance block, signal disk, flywheel, and needle roller bearings.

[0003] Existing eccentric shaft technologies suffer from the following technical defects: First, the heat treatment process only employs single quenching or carburizing, resulting in insufficient hardness, dimensional stability, wear resistance, and fatigue life to simultaneously meet the high-pressure operating requirements of rotary engines. Second, the lack of targeted lightweight structures in non-critical load-bearing areas leads to excessive shaft mass, affecting overall machine operating efficiency. Third, the flywheel lacks a convenient fixing structure during assembly, resulting in low assembly efficiency. Fourth, needle roller bearings are prone to movement after installation, affecting operational reliability. Therefore, there is an urgent need for an eccentric shaft structure that combines high strength, lightweight design, convenient assembly, and reliable bearing positioning. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides a rotor engine eccentric shaft with high strength, easy assembly, and a positionable bearing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-strength, easy-to-assemble, and positionable bearing rotor engine eccentric shaft, comprising an eccentric shaft body, a hexagonal structure, an eccentric journal, two shoulders, and multiple weight-reducing holes; The eccentric shaft body is provided with an eccentric journal. The non-critical stress area of ​​the eccentric journal is provided with multiple weight reduction holes to reduce the mass of the eccentric shaft without weakening the structural strength. The front end of the eccentric shaft body is provided with a regular hexagonal structure, which is used to fix the eccentric shaft body so as to tighten the screws of the flywheel and related components. The two sides of the eccentric journal are respectively provided with shoulders. The two shoulders are respectively in contact with the two end faces of the needle roller bearing to form an axial limiting structure to limit the axial movement of the needle roller bearing and its cage.

[0006] The eccentric shaft body undergoes rough machining, carburizing, quenching, and cryogenic treatment.

[0007] The cryogenic treatment of the eccentric shaft body is performed after the quenching process is completed.

[0008] The hexagonal structure is integrally formed with the eccentric shaft body, and the distance between opposite sides of the hexagonal structure is adapted to the opening size of the assembly wrench.

[0009] The two shoulders are integrally formed with the eccentric journal, and the end face of each shoulder is perpendicular to the axis of the eccentric journal.

[0010] Compared with the prior art, the beneficial effects of the present invention are: 1. Enhanced strength and durability: Through a combination of rough machining, carburizing, quenching and cryogenic treatment, the shaft structure is refined and residual stress is eliminated, significantly improving the hardness, dimensional stability, wear resistance and fatigue life of the eccentric shaft. It can withstand high-pressure gas loads for a long time and meet the requirements of high strength and high rigidity.

[0011] 2. Achieving lightweight goals: Multiple weight-reduction holes are opened in the non-critical stress areas of the eccentric journal to effectively reduce the overall mass of the eccentric shaft without weakening the structural strength and rigidity, thus helping the rotor engine achieve the goal of overall weight reduction and avoiding excessive mass from affecting operating efficiency.

[0012] 3. Optimized assembly convenience: The one-piece hexagonal structure of the eccentric shaft front end can be precisely matched with the assembly wrench, which can quickly fix the shaft during assembly and prevent it from rotating when tightening the flywheel and related component screws, simplifying the operation process and improving assembly efficiency and accuracy.

[0013] 4. Bearing installation reliability assurance: The shoulders on both sides of the eccentric journal are integrally formed with the journal and the end face is perpendicular to the axis, which can provide stable axial limit for the needle roller bearing, effectively limit the movement of the bearing cage, avoid operational failure, and ensure the reliability of the fit between the eccentric shaft and the needle roller bearing.

[0014] In summary, through the synergistic effect of structural design and process optimization, this invention achieves a comprehensive effect of high strength and durability of the eccentric shaft, lightweight design, convenient assembly, and reliable bearing positioning. This reduces the difficulty of installation and maintenance of the rotary engine and comprehensively improves the overall stability and performance of the machine. Attached Figure Description

[0015] Figure 1 This is a front view of the present invention; Figure 2 This is a schematic diagram of the eccentric journal structure of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] This embodiment describes a high-strength, easy-to-assemble, and positionable bearing rotor engine eccentric shaft, including an eccentric shaft body 1, a hexagonal structure 3, an eccentric shaft journal 5, two shoulders 4, and multiple weight-reducing holes 2. The eccentric shaft body 1 is provided with an eccentric journal 5, and the eccentric journal 5 is provided with a plurality of weight reduction holes 2 to reduce the mass of the eccentric shaft. The front end of the eccentric shaft body 1 is provided with a regular hexagonal structure 3, which is used to fix the eccentric shaft body 1 so as to tighten the screws of the flywheel and related components. The two sides of the eccentric journal 5 are respectively provided with shoulders 4, which are respectively in contact with the two end faces of the needle roller bearing to form an axial limiting structure to limit the axial movement of the needle roller bearing and its cage.

[0018] The eccentric shaft body 1 is subjected to rough machining, carburizing, quenching and cryogenic treatment.

[0019] The cryogenic treatment of the eccentric shaft body 1 is carried out after the quenching process.

[0020] The hexagonal structure 3 is integrally formed with the eccentric shaft body 1, and the distance between opposite sides of the hexagonal structure 3 is adapted to the opening size of the assembly wrench.

[0021] The two shoulders 4 are integrally formed with the eccentric journal 5, and the end face of each shoulder 4 is perpendicular to the axis of the eccentric journal 5.

[0022] The eccentric shaft described in this invention serves as a core load-bearing and positioning component of a rotary engine. Its working principle is based on the synergistic effect of structural design and process optimization, achieving comprehensive functions including strength assurance, lightweight design, convenient assembly, and reliable positioning. Specifically, the eccentric shaft body 1 undergoes rough machining (using 40CrNiMoA alloy steel for turning and milling to ensure basic dimensional accuracy), carburizing (carburizing at 920-950℃ for 3-4 hours, resulting in a carburized layer depth of 1.2-1.5mm), and quenching (using 850-88℃). The eccentric shaft undergoes a combination of oil quenching at 0℃ to achieve a surface hardness of HRC58-62 and cryogenic treatment (which can be performed by immediately placing the shaft in a -100℃ environment for 3 hours after quenching to eliminate residual stress). The carburizing and quenching processes form a hardened layer on the shaft surface, and the subsequent cryogenic treatment can further refine the microstructure and eliminate residual stress, significantly improving the hardness, dimensional stability, wear resistance and fatigue life of the eccentric shaft. This ensures that it can withstand the load generated by high-pressure gas during the operation of the rotary engine for a long time, meeting the requirements for high strength and high rigidity. Meanwhile, multiple weight-reduction holes 2 are provided at the eccentric journal 5 of the eccentric shaft body 1. The weight-reduction holes 2 can be in the form of through holes and are opened in the non-critical stress area of ​​the eccentric journal 5. By removing some material, weight reduction is achieved, effectively reducing the overall mass of the eccentric shaft without weakening the strength and rigidity of the shaft structure. This helps the rotary engine achieve the overall weight reduction target and avoids affecting the engine's operating efficiency due to excessive mass. The front end of the eccentric shaft body 1 is provided with a regular hexagonal structure 3 integrally formed with the shaft body. During the flywheel assembly process, the wrench can directly clamp the regular hexagonal structure 3 to fix the eccentric shaft body 1, preventing it from rotating when tightening the screws of the flywheel and related components, ensuring that the screws are tightened accurately. Stable tightening simplifies the assembly process, improving assembly efficiency and accuracy. The eccentric journal 5 has shoulders 4 on both sides that are integrally formed with the shaft body and whose end faces are perpendicular to the axis of the eccentric journal 5. When the needle roller bearing is fitted onto the eccentric journal 5, the shoulders 4 on both sides form an axial limiting fit with the end of the needle roller bearing, directly restricting the axial movement of the needle roller bearing cage, avoiding operational failures caused by bearing movement, ensuring the reliability of the fit between the needle roller bearing and the eccentric shaft, and thus improving the overall stability of the rotor engine. The various structures and processes work together to ensure that the eccentric shaft stably plays its core role in connection, support, and positioning in the rotor engine, while reducing the difficulty of installation and maintenance. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the 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 the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-strength, easily assembled, and positionable bearing eccentric shaft for a rotary engine, characterized in that: It includes an eccentric shaft body (1), a hexagonal structure (3), an eccentric shaft journal (5), two shoulders (4) and multiple weight-reducing holes (2); The eccentric shaft body (1) is provided with an eccentric journal (5). The non-critical stress area of ​​the eccentric journal (5) is provided with multiple weight reduction holes (2) to reduce the mass of the eccentric shaft without weakening the structural strength. The front end of the eccentric shaft body (1) is provided with a regular hexagonal structure (3). The regular hexagonal structure (3) is used to fix the eccentric shaft body (1) so as to tighten the screws of the flywheel and related components. The two sides of the eccentric journal (5) are respectively provided with shoulders (4). The two shoulders (4) are respectively attached to the two end faces of the needle roller bearing to form an axial limiting structure to limit the axial movement of the needle roller bearing and its cage.

2. The rotor engine eccentric shaft with high strength, easy assembly, and positionable bearing as described in claim 1, characterized in that: The eccentric shaft body (1) is subjected to rough machining, carburizing, quenching and cryogenic treatment.

3. The rotor engine eccentric shaft with high strength, easy assembly, and positionable bearing as described in claim 2, characterized in that: The cryogenic treatment of the eccentric shaft body (1) is carried out after the quenching process is completed.

4. The rotor engine eccentric shaft with high strength, easy assembly, and positionable bearing as described in claim 1, characterized in that: The hexagonal structure (3) is integrally formed with the eccentric shaft body (1), and the distance between opposite sides of the hexagonal structure (3) is adapted to the opening size of the assembly wrench.

5. The rotor engine eccentric shaft with high strength, easy assembly, and positionable bearing as described in claim 1, characterized in that: The two shoulders (4) are integrally formed with the eccentric journal (5), and the end face of each shoulder (4) is perpendicular to the axis of the eccentric journal (5).

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