Work fixture for machining eccentric shaft for hydraulic motor

Abstract

The invention discloses a tool clamp for machining an eccentric shaft for a hydraulic motor, and belongs to the technical field of tool clamps. According to the technical scheme, the tool clamp for machining the eccentric shaft for the hydraulic motor comprises a fixed pipe fitting, a regulation and control mechanism is arranged on one side of the fixed pipe fitting, a straight rack is arranged on the regulation and control mechanism, an inner fixed pipe is fixed in the fixed pipe fitting, and the inner fixed pipe is rotationally sleeved with a gear assembly; an opening is formed in one side of the fixed pipe fitting, and the spur rack penetrates through the opening and is meshed with the gear assembly; the straight rack is driven by the regulation and control mechanism to slide to drive the gear assembly to rotate, rotation is converted into linear motion of the lead screw part through the linkage mechanism to achieve clamping and positioning, the eccentric mechanism adjusts the position of the fixed pipe so as to adjust the eccentric distance, and the problems that in the prior art, positioning precision is low, clamping force is uneven, and the eccentric distance is inconvenient to adjust are solved. High-precision clamping positioning and eccentric distance adjustment can be achieved, and the machining efficiency and the product quality are improved.

Description

Technical Field

[0001] This invention belongs to the field of tooling and fixture technology, specifically relating to a tooling and fixture for machining an eccentric shaft for a hydraulic motor. Background Technology

[0002] Hydraulic motors use eccentric shafts as the core component of their power conversion system, and their geometric accuracy directly affects the transmission efficiency and service life of the hydraulic motor. Because the axis of the eccentric shaft is inherently offset from the rotation centerline, in precision machining processes such as turning and grinding, the tooling fixtures must ensure extremely high stability of the positioning datum and uniform distribution of clamping force to avoid energy loss or mechanical failure caused by machining errors.

[0003] However, existing eccentric shaft machining fixtures face multiple technical challenges in practical applications: traditional clamping mechanisms generally use manual bolt adjustment, which is lengthy and reliant on worker experience, easily introducing human error and causing the shaft positioning accuracy to fail to meet micron-level tolerance requirements; design flaws in the clamping force transmission structure lead to unbalanced force distribution on the eccentric shaft during clamping, with excessive concentrated stress in local areas, causing elastic deformation or even plastic damage, significantly increasing the scrap rate; the eccentricity adjustment mechanism lacks precision and versatility, requiring the redesign of dedicated fixtures for different eccentric shaft specifications, which not only extends the production preparation cycle but also significantly increases equipment investment and maintenance costs; core support components, such as the connection structure between the fixed pipe and the inner tube, have weak rigidity, easily generating minute displacements under high-speed machining vibration environments, leading to accelerated wear after long-term use, resulting in decreased overall fixture stability, shortened service life, and increased maintenance frequency. Although some improved fixtures attempt to integrate linkage structures, their transmission efficiency is low, the adjustment process is cumbersome and time-consuming, making it difficult to balance machining accuracy and production efficiency, and unable to support the large-scale industrial production needs of hydraulic motors. Summary of the Invention

[0004] The present invention provides a tooling fixture for machining an eccentric shaft for a hydraulic motor, in order to solve at least one of the above-mentioned technical problems.

[0005] The technical solution adopted in this invention is as follows: A tooling fixture for machining an eccentric shaft for a hydraulic motor includes a fixed pipe fitting, an adjustment mechanism on one side of the fixed pipe fitting, a rack on the adjustment mechanism, an inner fixed pipe fixed inside the fixed pipe fitting, a gear assembly rotatably sleeved on the inner fixed pipe, an opening on one side of the fixed pipe fitting, and the rack passing through the opening and meshing with the gear assembly. A connecting pipe is provided on one side of the fixed pipe, and a linkage mechanism is provided on the connecting pipe. The linkage mechanism is connected to the gear assembly, and a lead screw is provided on the linkage mechanism. An abutment is fixed at one end of the lead screw that extends into the inner fixed pipe. The rear end of the fixed pipe fitting is provided with an eccentric mechanism.

[0006] Furthermore, this application also proposes that the control mechanism is used to drive the gear assembly to rotate, and the spur rack is driven to slide up and down through the control mechanism, thereby driving the gear assembly to rotate stably on the inner fixed tube.

[0007] Furthermore, this application also proposes that the linkage mechanism is used to convert the rotation of the gear assembly into the linear motion of the lead screw, and the abutment member achieves clamping and positioning of the eccentric shaft through the linear motion of the lead screw.

[0008] Furthermore, this application also proposes that the eccentric mechanism is used to adjust the machining eccentricity of the eccentric shaft, thereby adjusting the position of the fixed pipe and thus adjusting the machining eccentricity accuracy of the eccentric shaft.

[0009] Furthermore, this application also proposes that the eccentric mechanism includes a movable frame disposed at the rear end of the fixed pipe fitting, an adjusting screw is rotatably sleeved inside the movable frame, a movable block is threaded onto the adjusting screw, the movable block is slidably installed inside the movable frame, the movable block is fixedly connected to the fixed pipe fitting, and by rotating the adjusting screw, the movable block is driven to slide inside the movable frame, thereby driving the fixed pipe fitting to move synchronously, so as to achieve precise adjustment of the eccentricity.

[0010] Furthermore, this application also proposes that a fixing ring is fixed to the rear end of the fixing pipe fitting, and the fixing ring is fixedly connected to the inner fixing pipe to improve the installation stability of the inner fixing pipe in the fixing pipe fitting; multiple fixing plates are provided at equal intervals at the front end of the fixing pipe fitting, and the multiple fixing plates are fixedly connected to the inner fixing pipe to further strengthen the inner fixing pipe, prevent it from shaking during processing, and ensure the processing accuracy of the eccentric shaft.

[0011] Furthermore, this application also proposes that multiple fixing blocks are provided at equal intervals on the inner fixing tube, and an annular groove is provided on the inner circumferential side wall of the gear assembly. The multiple fixing blocks are all set in the annular groove. Through the sliding cooperation between the fixing blocks and the annular groove, the gear assembly is guided and limited, ensuring that the gear assembly rotates smoothly on the inner fixing tube, avoiding deviation, and ensuring the transmission stability of the linkage mechanism.

[0012] Furthermore, this application also proposes that the control mechanism includes a support frame fixed to one side of the fixed pipe fitting. A guide hole is provided in the support frame, and a screw rod is slidably installed in the guide hole. The lower end of the screw rod is fixed to the upper end of the rack. Two nuts are threaded onto the screw rod. The two nuts are respectively located at the upper and lower ends of the support frame. By tightening the two nuts, the screw rod is fixed to the support frame, thereby fixing the position of the rack and locking the rotation state of the gear assembly to ensure clamping stability.

[0013] Furthermore, this application also proposes that the linkage mechanism includes a lead screw nut rotatably sleeved on the connecting pipe, a helical gear fixed on the lead screw nut, an end gear plate fixed on one side of the gear assembly, the helical gear and the end gear plate meshing, the lead screw being slidably installed inside the connecting pipe, and the lead screw being threadedly sleeved inside the lead screw nut; when the gear assembly rotates, it drives the end gear plate to rotate synchronously, the end gear plate drives the helical gear to rotate, and then drives the lead screw nut to rotate, causing the lead screw to move linearly along the connecting pipe, driving the contacting member to approach or move away from the eccentric shaft, thereby realizing the clamping or releasing action.

[0014] Furthermore, this application also proposes that a sliding groove is provided on one side of the lead screw component, and a sliding block is slidably installed in the sliding groove. The sliding block penetrates the side wall of the connecting pipe and is fixedly connected to the connecting pipe. Through the sliding cooperation between the sliding block and the sliding groove, the lead screw component is guided and limited, preventing the lead screw component from rotating synchronously with the lead screw nut and ensuring that the lead screw component makes smooth linear motion. The connecting pipe is provided with three pipes and is fixed at equal intervals on one side of the fixed pipe component. The three abutting parts are arranged in an arc shape and the distribution trajectory is circular. The arc surface faces the axis of the inner fixed pipe, and the axis of the lead screw component and the center of the inner fixed pipe are overlapped.

[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows: 1. This application adopts a multi-stage precision transmission of spur rack-gear assembly-helical gear-screw nut, combined with a radial clamping structure of three equally spaced arc-shaped contact parts, to achieve uniform and stable clamping of the eccentric shaft; through the guidance of the fixed block and the annular groove, and the anti-rotation limit of the sliding block and the slide groove, the transmission gap and shaking are greatly reduced, and the positioning accuracy and clamping reliability are significantly improved.

[0016] 2. An eccentric adjustment mechanism that uses an adjusting screw to drive a moving block to move a fixed pipe can achieve continuous, micro-precision, and precise adjustment of the eccentricity. The adjustment process is intuitive and controllable, effectively solving the problems of cumbersome adjustment and large errors of traditional fixtures, and ensuring the machining accuracy of the eccentric shaft.

[0017] 3. The internal fixing tube is reinforced at both the front and rear ends by fixing rings and multiple fixing plates, which improves the installation stability and overall rigidity of the internal fixing tube in the fixing fitting, reduces the risk of processing vibration and deformation, extends the service life of the tooling, and ensures long-term consistent processing accuracy.

[0018] 4. The eccentricity can be adjusted flexibly and precisely, and the clamping range can be adapted to different outer diameter eccentric shafts through the adjustment mechanism. There is no need to design special fixtures for different specifications of products, which reduces tooling development and production costs and meets the needs of multi-variety, small-batch and large-scale production.

[0019] 5. The overall design adopts an integrated mechanical transmission system, ensuring smooth and efficient power transmission. The clamping, locking, and eccentric adjustment process is simplified, allowing operators to quickly complete clamping and adjustment. This avoids problems such as uneven force on the eccentric shaft and positioning misalignment, effectively reducing workpiece deformation and scrap rate, and improving processing efficiency. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a diagram showing the meshing structure of the gear assembly and the spur rack in this invention; Figure 3 This is a structural diagram of the connecting pipe, lead screw nut, and lead screw component in this invention; Figure 4 This is a structural diagram of the fixing tube in this invention; Figure 5 Appendix to this invention Figure 4 Enlarged view of point A; Figure 6 This is a structural diagram of the movable frame in this invention; Figure 7 This is a cross-sectional view of the fixing ring in this invention; Figure 8 This is a structural diagram of the lead screw component in this invention.

[0021] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0022] In the attached diagram: 1. Fixed pipe fitting; 2. Straight rack; 3. Support frame; 4. Nut; 5. Screw; 6. Gear assembly; 7. Annular groove; 8. Abutting part; 9. Lead screw nut; 10. Helical gear; 11. Connecting pipe; 12. Lead screw; 13. Sliding block; 14. Opening; 15. Inner fixed pipe; 16. Fixed block; 17. Fixed plate; 18. Moving frame; 19. Adjusting screw; 20. Moving block; 21. Fixed ring; 22. Slide groove; 23. End gear plate. Detailed Implementation

[0023] To more clearly illustrate the overall concept of the present invention, a detailed description is provided below with reference to the accompanying drawings and examples.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0025] Furthermore, in the description of this invention, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," "specific example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] Traditional tooling fixtures for machining eccentric shafts in hydraulic motors have shortcomings in positioning accuracy, clamping stability, eccentricity adjustment accuracy, and the stability of core component installation. Specifically, they are cumbersome to operate, have large adjustment errors, are prone to uneven stress on the eccentric shaft leading to deformation, and have a high scrap rate. Furthermore, they lack versatility, requiring the design of dedicated fixtures for different eccentric shaft specifications, increasing production costs. In addition, insufficient installation stability of core components and low transmission efficiency make it difficult to balance machining accuracy and efficiency, failing to meet the demands of large-scale production.

[0029] Reference Figures 1-8This application proposes a tooling fixture for machining an eccentric shaft for a hydraulic motor, including a fixed pipe 1, an adjustment mechanism on one side of the fixed pipe 1, a rack 2 on the adjustment mechanism, an inner fixed pipe 15 fixed inside the fixed pipe 1, a gear assembly 6 rotatably sleeved on the inner fixed pipe 15, an opening 14 on one side of the fixed pipe 1, and the rack 2 passing through the opening 14 and meshing with the gear assembly 6. The fixed tube 1 has a connecting tube 11 on one side, and a linkage mechanism is provided on the connecting tube 11. The linkage mechanism is connected to the gear assembly 6. The linkage mechanism has a lead screw 12. One end of the lead screw 12 extending into the inner fixed tube 15 is fixed with an abutment 8. The rear end of the fixed pipe fitting 1 is equipped with an eccentric mechanism.

[0030] For ease of understanding, the following explains some key terms in this embodiment: Fixed pipe fitting 1, as the main structure of the fixture, is used to support and fix the various internal functional components, and to provide a stable support environment for the machining of the eccentric shaft.

[0031] The control mechanism drives the rack 2 to move linearly, thereby driving the gear assembly 6 to rotate, and is the source of the initial driving force for the clamping action.

[0032] The spur rack 2, as the actuating component of the control mechanism, converts its linear motion into the rotational motion of the gear assembly 6 through meshing with the gear assembly 6.

[0033] The inner fixed tube 15 is disposed inside the fixed tube 1, providing rotational support for the gear assembly 6 and serving as the movement space for the lead screw 12 and the contact member 8.

[0034] The gear assembly 6 is designed to convert the linear motion of the rack 2 into its own rotational motion and transmit this rotational motion to the linkage mechanism.

[0035] An opening 14 is provided on one side of the fixed tube 1 for the rack 2 to pass through and mesh with the gear assembly 6, ensuring a smooth transmission path.

[0036] The connecting pipe 11 is fixed to one side of the fixed pipe 1 and is used to accommodate and support the linkage mechanism, and to serve as a motion guide for the lead screw 12.

[0037] The linkage mechanism, whose core function is to convert the rotational motion of the gear assembly 6 into the linear motion of the lead screw 12, is the key transmission link for realizing the clamping action.

[0038] The lead screw 12, as the actuator of the linkage mechanism, directly drives the contact member 8 with its linear motion to clamp or release the eccentric shaft.

[0039] The contacting part 8 directly contacts the eccentric shaft to be processed, and clamps and positions the eccentric shaft through the drive of the lead screw part 12.

[0040] The eccentric mechanism is used to adjust the overall position of the fixed pipe 1, thereby achieving precise adjustment of the machining eccentricity of the eccentric shaft.

[0041] The core of the tooling fixture in this application lies in achieving precise machining of the eccentric shaft through the coordinated operation of various mechanisms.

[0042] Specifically, the fixed pipe fitting 1 serves as the main support of the clamp, and a control mechanism is configured on one side of it. This control mechanism includes a rack 2 to provide the initial driving force. For example, the control mechanism can be designed as a manual push-pull rod, with the rack 2 fixed to it, allowing manual operation to move the rack 2 up and down. Alternatively, the control mechanism can also include a handwheel-driven gear that meshes with the rack 2, driving the rack 2 to linear motion by rotating the handwheel.

[0043] An inner fixing tube 15 is fixedly installed inside the fixing fitting 1. The gear assembly 6 is rotatably sleeved on the inner fixing tube 15, thereby obtaining stable rotational support. For example, the inner fixing tube 15 can be fixed to the inner wall of the fixing fitting 1 by welding or bolting. The gear assembly 6 can be directly sleeved on the outer surface of the inner fixing tube 15, and its rotational function can be achieved by simple bearings or bushings.

[0044] An opening 14 is provided on one side of the fixed tube 1, through which the rack 2 extends into the interior of the fixed tube 1 and meshes with the gear assembly 6. Thus, the linear motion of the rack 2 is converted into the rotational motion of the gear assembly 6. For example, the opening 14 can be designed as a rectangular slot through which the rack 2 passes directly. A standard spur gear meshing method is used between the rack 2 and the gear assembly 6 to ensure reliable transmission.

[0045] Furthermore, a connecting pipe 11 is provided on the other side of the fixed pipe fitting 1, and a linkage mechanism is configured on the connecting pipe 11. This linkage mechanism is connected to the gear assembly 6 and is used to convert the rotational motion of the gear assembly 6 into the linear motion of the lead screw 12. An abutment 8 is fixed to one end of the lead screw 12 extending into the inner fixed pipe 15. For example, the connecting pipe 11 can be fixed to the side of the fixed pipe fitting 1 by welding or bolting. The linkage mechanism can include a simple gear transmission chain that transmits the rotation of the gear assembly 6 to a threaded rod, which is threadedly connected to the lead screw 12, thereby driving the lead screw 12 to perform linear motion. The abutment 8 can be directly fixed to the end of the lead screw 12 by threads or pins to facilitate contact with the eccentric shaft.

[0046] Furthermore, an eccentric mechanism is provided at the rear end of the fixed pipe fitting 1. This eccentric mechanism is used to adjust the overall position of the fixed pipe fitting 1, thereby adjusting the machining eccentricity of the eccentric shaft. For example, the eccentric mechanism can be a simple eccentric block, and the relative position of the fixed pipe fitting 1 can be changed by rotating the eccentric block. As another implementation, the eccentric mechanism can also include a manually adjustable bolt, and the fixed pipe fitting 1 can be pushed to make a small displacement by turning the bolt to adjust the eccentricity.

[0047] The tooling fixture of this application effectively solves the problems of insufficient positioning accuracy, poor clamping stability, cumbersome adjustment, and low eccentricity adjustment accuracy of existing eccentric shaft machining fixtures through the synergistic effect of the control mechanism, linkage mechanism, and eccentricity mechanism. This fixture enables rapid and precise clamping and positioning of the eccentric shaft and provides flexible eccentricity adjustment, significantly improving machining accuracy and efficiency, reducing scrap rate, and enhancing the fixture's versatility and service life, thus meeting the needs of high-precision, large-scale production of eccentric shafts for hydraulic motors.

[0048] Reference Figure 2 , Figure 4 as well as Figure 5 This application further clarifies the working method of the control mechanism, namely, the control mechanism is used to drive the gear assembly 6 to rotate, and the spur rack 2 is driven to slide up and down through the control mechanism, thereby driving the gear assembly 6 to rotate stably on the inner fixed tube 15.

[0049] Specifically, the control mechanism is the power source and control unit for realizing the rotational motion of the gear assembly 6. Its function is to convert external operations (such as manual adjustment or motor drive) into linear motion driving force for the rack 2, thereby causing the gear assembly 6 to rotate as desired through gear meshing. This drive can be intermittent, used for position adjustment; or continuous, used for clamping or releasing operations. The control mechanism drives the rack 2 to slide up and down, which is the specific way the control mechanism drives the gear assembly 6. The rack 2 is designed to perform linear reciprocating motion in a specific direction (e.g., the vertical direction). The control mechanism precisely transmits its driving force to the rack 2 through a mechanical connection or transmission device, causing it to move smoothly up and down along a preset path. This linear sliding motion is the direct input for the rotation of the gear assembly 6. This drives the gear assembly 6 to rotate stably on the inner fixed tube 15. Stable rotation means that when the gear assembly 6 rotates on the inner fixed tube 15, its motion trajectory is smooth, without jamming or obvious vibration, and it can accurately respond to the drive of the rack 2. This requires a good meshing relationship between the rack 2 and the gear assembly 6, and a reasonable clearance between the gear assembly 6 and the inner fixed tube 15, to ensure the continuity of force transmission and the accuracy of motion throughout the rotation process.

[0050] Through this explicit driving mechanism, this application effectively solves the problems of insufficient smoothness and poor precision that may occur during the rotation of gear assembly 6. The controlled sliding of rack 2 ensures that the meshing with gear assembly 6 is always in the optimal state, thereby avoiding rotational deviation or jamming of gear assembly 6 caused by unstable driving. This stable rotation provides a reliable and accurate input for the subsequent linkage mechanism to convert the rotation of gear assembly 6 into the linear motion of lead screw 12, ultimately ensuring the accuracy and reliability of the clamping and positioning of eccentric shaft by contact member 8, and thus improving the machining accuracy of eccentric shaft for hydraulic motors.

[0051] Reference Figures 1-3 ,as well as Figure 8 This application further proposes a linkage mechanism to convert the rotation of the gear assembly 6 into linear motion of the lead screw 12, and the abutment 8 achieves clamping and positioning of the eccentric shaft through the linear motion of the lead screw 12.

[0052] Specifically, the core function of the linkage mechanism is to realize the conversion of motion. When the gear assembly 6 receives external drive and rotates, the linkage mechanism accurately transmits this rotational motion and converts it into the linear reciprocating motion of the lead screw 12 through its internal mechanical transmission elements. This conversion mechanism is the basis for realizing subsequent clamping and positioning operations. It can be implemented in various ways, such as through the cooperation of gears and racks, cams and driven components, or threaded drives.

[0053] The contact element 8 is the component that directly contacts the eccentric shaft to be machined. Through the linear movement of the lead screw 12, it can actively move closer to or further away from the eccentric shaft. When the lead screw 12 drives the contact element 8 to move towards the eccentric shaft, the contact element 8 applies a certain pressure to the eccentric shaft, thereby firmly fixing the eccentric shaft in the preset machining position, achieving precise clamping and positioning. This clamping method ensures that the eccentric shaft will not shift or wobble during machining, thus guaranteeing machining accuracy.

[0054] Through the above technical solution, this application clarifies that the linkage mechanism converts the rotational motion of the gear assembly 6 into the linear motion of the lead screw 12, and uses this linear motion to drive the contact member 8 to clamp and position the eccentric shaft. This provides a clear, efficient, and controllable clamping mechanism, ensuring the stability and positioning accuracy of the eccentric shaft during processing. This solution effectively solves the technical problem of how to convert rotational drive into precise linear clamping, thereby guaranteeing the processing quality of the eccentric shaft for hydraulic motors.

[0055] Reference Figures 1-7 This application further proposes that the rear end of the fixed pipe fitting 1 is provided with an eccentric mechanism. The eccentric mechanism is used to adjust the machining eccentricity of the eccentric shaft. By adjusting the position of the fixed pipe fitting 1 through the eccentric mechanism, the machining eccentricity accuracy of the eccentric shaft can be adjusted.

[0056] The eccentric mechanism is a mechanical structure capable of changing the relative position of components to adjust the eccentricity. In this application, its core function is to adjust the machining eccentricity of the eccentric shaft. This mechanism can be implemented in various forms, such as through an eccentric sleeve, a slider guide rail with screw drive, or a cam mechanism. Its basic principle is to use mechanical transmission or displacement conversion to generate a controllable offset between the rotation center of the workpiece (eccentric shaft) and the fixed center of the fixture.

[0057] Adjusting the position of the fixed pipe fitting 1 is the specific means by which the eccentric mechanism achieves eccentricity adjustment. By moving the fixed pipe fitting 1, the position of the eccentric shaft clamped inside it relative to the center of the entire tooling fixture can be changed. This position adjustment can be linear movement, or a slight rotation or tilt, but the core is to change the geometric center position of the fixed pipe fitting 1. For example, the fixed pipe fitting 1 can be mounted on a movable slide rail and driven to move in a specific direction by a screw or rack and pinion.

[0058] Adjusting the machining eccentricity accuracy of the eccentric shaft is the ultimate goal of the entire eccentric mechanism and position adjustment. By precisely controlling the position of the fixed pipe 1, the actual machining eccentricity of the eccentric shaft can be precisely controlled, ensuring that the machined eccentric shaft meets the design requirements. This typically requires a high-precision adjustment mechanism and measurement feedback system, and the accuracy of the adjustment mechanism directly affects the machining accuracy of the eccentric shaft.

[0059] Through the above technical solution, this application enables flexible adjustment of the eccentricity during eccentric shaft machining. Specifically, the eccentric mechanism precisely controls the position of the fixed pipe 1, allowing the rotation center of the eccentric shaft clamped within it to be controllably offset relative to the overall center of the tooling fixture. This adjustability greatly enhances the versatility of the tooling fixture, enabling it to adapt to eccentric shaft machining tasks with different specifications and eccentricity requirements. Simultaneously, because the eccentric mechanism can precisely adjust the position of the fixed pipe 1, it directly affects the machining eccentricity accuracy of the eccentric shaft, effectively avoiding the instability in accuracy caused by manual adjustment or the lack of a dedicated mechanism in traditional methods, thus ensuring machining quality and efficiency.

[0060] Reference Figure 6 The eccentric mechanism of this application includes a movable frame 18 disposed at the rear end of the fixed pipe 1. An adjusting screw 19 is rotatably sleeved inside the movable frame 18. A movable block 20 is threaded onto the adjusting screw 19. The movable block 20 is slidably installed inside the movable frame 18. The movable block 20 is fixedly connected to the fixed pipe 1. By rotating the adjusting screw 19, the movable block 20 is driven to slide inside the movable frame 18, thereby driving the fixed pipe 1 to move synchronously, so as to achieve precise adjustment of the eccentricity.

[0061] Specifically, the movable frame 18 is typically a rigid frame structure positioned at the rear end of the fixed pipe 1. Its main function is to provide a stable mounting base and precise guide rail for the subsequent adjusting screw 19 and movable block 20, ensuring accurate movement trajectories during eccentricity adjustment. It can be made of high-strength metal materials such as alloy steel or cast iron to guarantee overall structural stability and resistance to deformation. The adjusting screw 19 is a precision-threaded rod that rotates within the movable frame 18. The adjusting screw 19 converts rotational motion into linear motion, achieving precise displacement control of the movable block 20. To achieve high-precision eccentricity adjustment, the adjusting screw 19 is typically a precision ball screw or trapezoidal screw, and can be precisely positioned using a dial or encoder. Its rotation can be manually driven by a knob or automatically controlled by a small motor. The movable block 20 is a component with an internal threaded hole that mates with the adjusting screw 19, and an external sliding surface that matches the internal guide rail of the movable frame 18. The movable block 20 is threadedly connected to the adjusting screw 19 and slidably mounted within the movable frame 18. Its function is to transmit the linear motion of the adjusting screw 19 to the fixed pipe fitting 1. The movable block 20 and the fixed pipe fitting 1 are fixedly connected, such as by bolts, welding, or an integrated design, to ensure no relative displacement between them and achieve synchronous movement. The sliding fit between the movable block 20 and the movable frame 18 can be achieved using linear guides, dovetail guides, or sliding bearings to reduce frictional resistance and improve motion accuracy and stability.

[0062] Through the above technical solution, when the operator rotates the adjusting screw 19, the rotational motion of the adjusting screw 19 is converted into the linear motion of the moving block 20 due to the threaded engagement between the adjusting screw 19 and the moving block 20. Since the moving block 20 is slidably installed in the moving frame 18 and fixedly connected to the fixed pipe 1, the linear motion of the moving block 20 directly drives the fixed pipe 1 to move synchronously along the preset direction. This adjustment method based on threaded transmission has the characteristics of high precision, high stability, and repeatable positioning, effectively solving the problems of insufficient precision and inconvenient adjustment that may exist in traditional adjustment methods. By finely rotating the adjusting screw 19, the position of the fixed pipe 1 can be adjusted at the micron or even sub-micron level, thereby ensuring precise control of the eccentricity of the eccentric shaft machining, greatly improving the machining accuracy and product quality of the eccentric shaft for hydraulic motors, while simplifying operation and improving adjustment efficiency.

[0063] Reference Figure 7This application further proposes that a fixing ring 21 is fixed at the rear end of the fixed pipe fitting 1, and the fixing ring 21 is fixedly connected to the inner fixing pipe 15 to improve the installation stability of the inner fixing pipe 15 in the fixed pipe fitting 1; multiple fixing plates 17 are provided at equal intervals at the front end of the fixed pipe fitting 1, and the multiple fixing plates 17 are fixedly connected to the inner fixing pipe 15 to further strengthen the inner fixing pipe 15, prevent it from shaking during processing, and ensure the processing accuracy of the eccentric shaft.

[0064] Specifically, the fixing ring 21 is a ring-shaped structural component whose main function is to provide an additional fixing point to connect the rear end of the inner fixing tube 15 to the rear end of the fixing fitting 1, thereby enhancing the overall fixing strength and stability of the inner fixing tube 15. The fixing ring 21 can be fixedly connected to the rear end of the fixing fitting 1 and the inner fixing tube 15 by welding, bolting, or interference fit. For example, the outer diameter of the fixing ring 21 can be tightly fitted with the inner diameter of the fixing fitting 1 and fixed by bolts or pins; its inner diameter can be tightly fitted with the outer diameter of the inner fixing tube 15 and fixed by welding or bolts. Meanwhile, the fixing plate 17 is a plate-shaped structural component. Multiple fixing plates 17 are equally spaced at the front end of the fixing fitting 1 and fixedly connected to the inner fixing tube 15. Their function is to provide multi-point support and fixation, further dispersing the stress generated during processing and effectively suppressing possible shaking of the inner fixing tube 15 at the front end. The fixing plate 17 can be fixedly connected to the fixing fitting 1 and the inner fixing tube 15 by welding, bolting, or riveting. For example, one end of the fixing plate 17 can be welded or bolted to the inner wall of the fixing pipe 1, and the other end can be welded or bolted to the outer wall of the inner fixing pipe 15. Equal spacing helps to evenly distribute the supporting force and avoid localized stress concentration.

[0065] Through the above technical solution, a fixing ring 21 is fixedly installed at the rear end of the fixing fitting 1 and fixedly connected to the inner fixing tube 15, providing a solid rear end support point for the inner fixing tube 15 and effectively improving the overall installation stability of the inner fixing tube 15 within the fixing fitting 1. Simultaneously, multiple fixing plates 17 are evenly spaced at the front end of the fixing fitting 1, and these fixing plates 17 are all fixedly connected to the inner fixing tube 15, forming a multi-point support structure. This further reinforces the front end of the inner fixing tube 15, effectively suppressing any possible shaking during processing. This coordinated reinforcement at both ends significantly enhances the rigidity and vibration resistance of the inner fixing tube 15, thereby ensuring the positioning accuracy and stability of the eccentric shaft during processing, ultimately guaranteeing the processing accuracy of the eccentric shaft.

[0066] Reference 4- Figure 5This application further proposes that a plurality of fixing blocks 16 are provided at equal intervals on the inner fixing tube 15 of the invention, and an annular groove 7 is provided on the inner circumferential side wall of the gear assembly 6 of the invention. The plurality of fixing blocks 16 are all disposed in the annular groove 7. Through the sliding cooperation between the fixing blocks 16 and the annular groove 7, the gear assembly 6 plays a guiding and limiting role, ensuring that the gear assembly 6 rotates smoothly on the inner fixing tube 15, avoiding deviation, and ensuring the transmission stability of the linkage mechanism.

[0067] Specifically, the multiple fixing blocks 16 evenly spaced on the inner fixing tube 15 are protruding structures uniformly distributed along the outer periphery of the inner fixing tube 15. These fixing blocks 16 can be made of high-strength wear-resistant materials, such as hardened steel or wear-resistant engineering plastics, and are firmly attached to the outer surface of the inner fixing tube 15 by welding, bolting, or integral molding. The evenly spaced arrangement helps to distribute the force evenly when the gear assembly 6 rotates, thereby providing symmetrical and stable guiding support. The cross-sectional shape of the fixing blocks 16 can be designed as rectangular, trapezoidal, or semi-circular to optimize the fit with the annular groove 7.

[0068] Meanwhile, an annular groove 7 is formed on the inner circumferential side wall of the gear assembly 6. The annular groove 7 is a groove formed by machining along the circumferential direction of the inner wall of the gear assembly 6, and its size and shape match the fixing block 16 on the inner fixed tube 15. The machining of the annular groove 7 can be achieved by precision turning or milling, and its inner surface can be finely polished or coated with a low-friction coating to further reduce sliding resistance and improve rotational efficiency.

[0069] During assembly and operation, multiple fixing blocks 16 are precisely positioned within the annular groove 7. This fit allows the fixing blocks 16 to slide within the annular groove 7 as guides, effectively constraining the radial and axial movement of the gear assembly 6. The sliding fit between the fixing blocks 16 and the annular groove 7 forms a precise guiding mechanism, allowing the gear assembly 6 to rotate freely on the inner fixed tube 15 while strictly limiting its displacement in the non-rotational direction.

[0070] Through the above technical solution, the fixing block 16 on the inner fixing tube 15 forms a tight sliding fit with the annular groove 7 inside the gear assembly 6, effectively providing precise guidance and reliable limiting for the rotation of the gear assembly 6. This structure significantly suppresses radial wobble and axial displacement that may occur during the rotation of the gear assembly 6, ensuring that the gear assembly 6 can maintain a high degree of rotational stability on the inner fixing tube 15. Therefore, it avoids transmission errors caused by unstable rotation of the gear assembly 6, greatly improves the transmission accuracy and stability of the linkage mechanism, and ultimately ensures the accuracy and reliability of clamping and positioning the eccentric shaft.

[0071] Reference Figure 1 and Figure 2This application further proposes a control mechanism including a support frame 3 fixed to one side of the fixed pipe fitting 1. A guide hole is provided in the support frame 3, and a screw rod 5 is slidably installed in the guide hole. The lower end of the screw rod 5 is fixed to the upper end of the rack 2. Two nuts 4 are threaded onto the screw rod 5. The two nuts 4 are respectively set at the upper and lower ends of the support frame 3. By tightening the two nuts 4, the screw rod 5 is fixed on the support frame 3, thereby fixing the position of the rack 2 and locking the rotation state of the gear assembly 6 to ensure clamping stability.

[0072] Specifically, the control mechanism is the core component used to adjust the tooling fixture. Its function is to achieve precise clamping and positioning of the eccentric shaft through mechanical transmission. This mechanism not only needs to provide adjustment capability, but more importantly, it needs to be reliably locked after adjustment to ensure stability during processing. The support frame 3, as the structural foundation of the control mechanism, provides stable installation and support for the screw 5 and bears the tightening force of the nut 4. It is usually made of high-strength metal material and is firmly fixed to one side of the fixed pipe 1 by welding, bolting, or other methods. Its structural strength and rigidity should be sufficient to withstand the forces and torques generated during operation, ensuring the stability of the entire control mechanism. A guide hole is opened inside the support frame 3, and its main function is to provide precise linear guidance for the screw 5. The inner wall of the guide hole is usually precision machined to ensure that the screw 5 can slide smoothly and without wobbling. The size and shape of the guide hole should match the shape of the screw 5; for example, it can be a round hole or a non-circular hole with an anti-rotation structure to prevent unnecessary rotation of the screw 5 during sliding. The screw rod 5 is the core component for adjusting and locking the position of the rack 2. One end is fixedly connected to the rack 2, and the other end passes through a guide hole on the support frame 3. The surface of the screw rod 5 is usually threaded to mate with the nut 4. The up-and-down movement of the screw rod 5 allows for precise fine-tuning of the rack 2. It is typically made of high-strength, wear-resistant metal materials, such as stainless steel or alloy steel. The nut 4 is the key component for locking the position of the screw rod 5. Two nuts 4 are threaded onto the screw rod 5 and located at the upper and lower ends of the support frame 3, respectively. Tightening these two nuts 4 clamps the support frame 3, thus firmly fixing the screw rod 5 in the preset position. This double-nut locking method provides a reliable self-locking effect, effectively preventing the screw rod 5 from loosening due to vibration or external force. The position of the rack 2 is fixed by tightening the two nuts 4. When the nuts 4 are tightened, they exert a clamping force on the support frame 3, thus firmly fixing the screw 5 that passes through the support frame 3. Since the lower end of the screw 5 is fixedly connected to the upper end of the rack 2, the fixing of the screw 5 directly locks the position of the rack 2. The rotation of the locking gear assembly 6 is due to the meshing of the rack 2 with the gear assembly 6. Once the position of the rack 2 is fixed, it cannot move up or down. This fixed state directly prevents the rotation of the gear assembly 6, thus locking it in its current position.

[0073] Through the above technical solution, in the tooling fixture for machining the eccentric shaft of the hydraulic motor, the clamping and positioning accuracy and machining eccentricity accuracy of the eccentric shaft are crucial. This application provides a stable and reliable locking mechanism by introducing a combination of support frame 3, guide hole, screw 5, and two nuts 4 into the control mechanism. Specifically, the lower end of the screw 5 is fixedly connected to the upper end of the rack 2 and slidably installed in the guide hole of the support frame 3. When it is necessary to lock the position of the rack 2, the operator only needs to tighten the two nuts 4 located at the upper and lower ends of the support frame 3 respectively. These two nuts 4 firmly clamp the screw 5 onto the support frame 3 through threaded engagement, thereby effectively fixing the position of the screw 5. Since the screw 5 is directly connected to the rack 2, the fixing of the screw 5 directly prevents the rack 2 from moving up and down. The meshing relationship between the rack 2 and the gear assembly 6 also locks the rotation state of the gear assembly 6 synchronously. This locking mechanism ensures that the gear assembly 6 will not rotate unexpectedly after adjustment, thereby maintaining the precise position and clamping force of the contact element 8 set by the linkage mechanism and the lead screw 12. This effectively avoids positioning errors caused by loosening of the control mechanism during machining, significantly improves the stability and machining accuracy of the eccentric shaft clamping and positioning, and ensures the reliability of the tooling fixture.

[0074] Reference Figure 2 and Figure 3 This application further proposes an inventive linkage mechanism including a lead screw nut 9 rotatably sleeved on a connecting pipe 11, a helical gear 10 fixed on the lead screw nut 9, an end gear plate 23 fixed on one side of the gear assembly 6, the helical gear 10 and the end gear plate 23 meshing, and a lead screw 12 slidably installed inside the connecting pipe 11, with the lead screw 12 threadedly sleeved inside the lead screw nut 9. When the gear assembly 6 rotates, it drives the end gear plate 23 to rotate synchronously, and the end gear plate 23 drives the helical gear 10 to rotate, thereby driving the lead screw nut 9 to rotate, causing the lead screw 12 to move linearly along the connecting pipe 11, driving the contact member 8 to approach or move away from the eccentric shaft, thereby realizing the clamping or releasing action.

[0075] Specifically, the lead screw nut 9 is a key component in the threaded transmission pair. It has internal threads that mate with the external threads of the lead screw component 12. The lead screw nut 9 is rotatably fitted onto the connecting pipe 11, meaning that the connecting pipe 11 provides it with rotary bearing support and radial positioning, ensuring that the lead screw nut 9 can rotate smoothly around its axis while bearing the radial force generated during transmission. This structural design guarantees the stability of the lead screw nut 9 during rotation and is the foundation for achieving precise threaded transmission.

[0076] The helical gear 10 serves as the power input component, with its teeth inclined along the axial direction, meshing with the teeth of the end gear disk 23. The helical gear 10 is fixed to the lead screw nut 9, allowing the lead screw nut 9 to rotate synchronously with the helical gear 10, thus directly transmitting the rotational power from the end gear disk 23 to the lead screw nut 9. Helical gear transmission offers advantages such as smooth transmission, low noise, high load-bearing capacity, and the ability to achieve interleaved shaft transmission, contributing to improved transmission efficiency and stability of the entire linkage mechanism.

[0077] The end gear 23 is the power input end of the linkage mechanism. Its teeth are distributed on the end face of the 23 and mesh with the teeth of the helical gear 10. The end gear 23 is fixed to one side of the gear assembly 6, ensuring that any rotation of the gear assembly 6 can be directly and without backlash transmitted to the end gear 23. This fixed connection method ensures the synchronicity and reliability of power transmission, which is the basis for achieving precise control.

[0078] The meshing of the helical gear 10 with the end gear plate 23 is the core link in realizing the conversion of the rotary motion of the gear assembly 6 to the rotary motion of the lead screw nut 9. Through the precise design of the tooth profile and meshing relationship, the smoothness and accuracy of power transmission can be ensured, avoiding slippage or jamming during the transmission process, thereby providing a stable rotary input for subsequent threaded transmission.

[0079] The lead screw 12 is the actuator that realizes linear motion. It has external threads that mate with the internal threads of the lead screw nut 9. The lead screw 12 is slidably mounted inside the connecting pipe 11, meaning that the connecting pipe 11 provides precise axial guidance and radial support, ensuring that the lead screw 12 can only perform linear motion during threaded transmission and will not rotate. This sliding mounting method is crucial for ensuring the accuracy and stability of the linear motion of the lead screw 12.

[0080] The lead screw 12 and the lead screw nut 9 are connected by a threaded pair, which is a direct way to convert rotary motion into linear motion. When the lead screw nut 9 rotates, the lead screw 12 is restricted from rotation by the connecting pipe 11, so the lead screw 12 will move linearly along the lead direction of the thread. This threaded transmission has the characteristics of good self-locking, large transmission ratio, and high transmission accuracy, and can convert a small rotational torque into a large axial thrust, thereby achieving reliable clamping of the eccentric shaft.

[0081] In actual operation, the rotation of gear assembly 6 first drives the end gear disk 23 fixed on one side to rotate synchronously. The rotation of end gear disk 23, through meshing with helical gear 10, drives the helical gear 10 fixed on lead screw nut 9 to rotate, thereby driving lead screw nut 9 to rotate. Since lead screw 12 is slidably installed in connecting pipe 11 and its rotation is restricted, the rotational motion of lead screw nut 9 is converted into linear motion of lead screw 12 along connecting pipe 11 through threaded pair. The linear motion of lead screw 12 directly drives the abutment 8 fixed at one end to move closer to or away from the eccentric shaft, thereby realizing precise clamping or loosening operation of the eccentric shaft.

[0082] Through the specific design of the aforementioned linkage mechanism, this application effectively solves the efficiency, stability, and accuracy problems that may exist in the conversion process from rotary to linear motion. Specifically, the rotation of the gear assembly 6 transmits power smoothly and efficiently to the lead screw nut 9 through the precise meshing of the end gear plate 23 with the helical gear 10. The inherent smoothness of the helical gear transmission reduces impact and vibration, improving transmission quality. Subsequently, the rotation of the lead screw nut 9, through its threaded engagement with the lead screw 12, converts the rotary motion into the linear motion of the lead screw 12 with high precision. The connecting pipe 11 provides reliable guidance and limit for the sliding installation of the lead screw 12, ensuring the pure linear motion of the lead screw 12 and preventing it from rotating with the lead screw nut 9, thereby ensuring that the contacting member 8 can clamp or release the eccentric shaft with the expected path and force. This precise transmission chain and guiding mechanism significantly improves the stability and accuracy of the eccentric shaft clamping and positioning, providing reliable tooling guarantees for the machining of eccentric shafts for hydraulic motors.

[0083] Reference Figure 7 and Figure 8This application further proposes that a groove 22 is provided on one side of the lead screw 12, and a sliding block 13 is slidably installed in the groove 22. The sliding block 13 penetrates the side wall of the connecting pipe 11 and is fixedly connected to the connecting pipe 11. Through the sliding engagement between the sliding block 13 and the groove 22, the lead screw 12 is guided and limited, preventing the lead screw 12 from rotating synchronously with the lead screw nut 9 and ensuring that the lead screw 12 makes smooth linear motion. The groove 22 is usually a groove extending along the axial direction of the lead screw 12, and its cross-sectional shape can be rectangular, V-shaped, or U-shaped to accommodate sliding blocks 13 of different shapes, providing a sliding track for the sliding blocks 13. The sliding block 13 is usually made of wear-resistant material. By matching its shape with the shape of the groove 22, a sliding engagement is achieved, providing support and guidance when the lead screw 12 makes linear motion, while preventing the lead screw 12 from rotating around its own axis. The sliding block 13 is fixedly connected to the connecting pipe 11, such as by bolting, welding, or riveting. This ensures that the sliding block 13 can transmit the fixing effect of the connecting pipe 11 to the lead screw 12, thereby effectively restricting the rotational freedom of the lead screw 12 and allowing it to slide only axially. This guiding and limiting function is the core of ensuring the normal functioning of the lead screw 12. When the lead screw nut 9 rotates, its thread drives the lead screw 12 to move axially, while the cooperation between the sliding block 13 and the slide groove 22 prevents the rotation of the lead screw 12, ensuring its pure linear motion and improving transmission efficiency and positioning accuracy.

[0084] Furthermore, the invention includes three connecting pipes 11, fixed at equal intervals to one side of the fixed pipe 1. The three contact elements 8 are arranged in an arc shape with a circular distribution trajectory, their arc surfaces facing the axis of the inner fixed pipe 15. The axis of the lead screw 12 overlaps with the center of the inner fixed pipe 15. Increasing the number of connecting pipes 11 to three, and distributing them at equal intervals, typically at a 120-degree angle, provides uniform support and clamping force. This multi-point support structure significantly improves the clamping stability of the eccentric shaft. The contact surfaces of the contact elements 8 are designed in an arc shape to match the outer circular surface of the eccentric shaft to be clamped. This arc-shaped contact increases the contact area, provides a more stable clamping force, and reduces stress concentration on the eccentric shaft surface. The circular distribution trajectory of the contact elements 8 ensures that they act uniformly on the eccentric shaft from different directions. The arc-shaped surface facing the axis of the inner fixing tube 15 ensures that the force of the contact member 8 is directed towards the center of the eccentric shaft when clamping, thereby achieving radial clamping of the eccentric shaft and providing stable concentric clamping. The axis of the lead screw 12 overlaps with the center of the inner fixing tube 15, meaning that the axis of motion of the lead screw 12 is aligned with the central axis of the inner fixing tube 15. This ensures that when the contact member 8 moves, its clamping force can be accurately applied to the center of the eccentric shaft, thereby achieving precise positioning and clamping.

[0085] Through the above technical solution, a groove 22 is opened on one side of the lead screw 12, and the sliding block 13 is slidably installed in the groove 22 and fixedly connected to the connecting pipe 11, thus achieving effective guidance and limiting of the lead screw 12. This design can prevent the lead screw 12 from rotating synchronously with the lead screw nut 9, thereby ensuring that the lead screw 12 makes smooth and precise linear movement in the connecting pipe 11, which greatly improves the stability and reliability of the clamping and positioning of the contact member 8. At the same time, the connecting pipe 11 is set as three and fixed at equal intervals on one side of the fixed pipe 1, so that the three contact members 8 can be arranged in an arc shape and the distribution trajectory is circular, with their arc surface facing the axis of the inner fixed pipe 15, and the axis of the lead screw 12 overlaps with the center of the inner fixed pipe 15. This multi-point arc clamping structure can provide uniform and stable radial clamping force, effectively avoiding the problem of wobbling or inaccurate positioning of the eccentric shaft during processing, and significantly improving the processing accuracy of the eccentric shaft and the overall stability of the tooling fixture.

[0086] The following example will provide a more detailed explanation of the above technical solution: First, the operator carefully places the eccentric shaft to be processed into the inner fixed tube 15 of the clamp. To achieve precise clamping of the eccentric shaft, the operator begins to operate the clamp's adjustment mechanism. This adjustment mechanism includes a support frame 3 fixed to one side of the fixed tube 1. The support frame 3 has a guide hole inside, and a screw 5 is slidably installed in the guide hole. The lower end of the screw 5 is fixedly connected to the upper end of the rack 2. By rotating the screw 5, the operator drives the rack 2 to slide smoothly up and down within the support frame 3. The rack 2 passes through the opening 14 in the side wall of the fixed tube 1 and precisely meshes with the gear assembly 6 rotatably sleeved on the inner fixed tube 15. The sliding of the rack 2 drives the gear assembly 6 to rotate stably on the inner fixed tube 15. This method of driving the rack 2 with the screw 5 provides a more precise and controllable adjustment process compared to traditional manual adjustment, effectively avoiding operational errors and improving the convenience of clamping operations.

[0087] The rotation of gear assembly 6 is then converted into linear motion of lead screw 12 via a linkage mechanism. The linkage mechanism includes a lead screw nut 9 rotatably sleeved on connecting pipe 11, with a helical gear 10 fixed to the lead screw nut 9. Simultaneously, an end gear plate 23 is fixed to one side of gear assembly 6, and the helical gear 10 meshes precisely with the end gear plate 23. When gear assembly 6 rotates, it drives the end gear plate 23 to rotate synchronously, which in turn drives the helical gear 10 to rotate, thereby driving the lead screw nut 9 to rotate. Lead screw 12 is slidably installed inside connecting pipe 11 and threaded into the lead screw nut 9. The rotation of lead screw nut 9 causes lead screw 12 to make smooth linear motion along connecting pipe 11. An abutment 8 is fixed to one end of lead screw 12 extending into inner fixed pipe 15. The linear motion of lead screw 12 drives the abutment 8 to gradually approach the eccentric shaft, achieving reliable clamping and positioning of the eccentric shaft.

[0088] To ensure stability during clamping and uniform force on the eccentric shaft, the fixture is designed with multiple connecting pipes 11, which are fixed at equal intervals to one side of the fixed pipe 1. Correspondingly, three abutting elements 8 are arranged in an arc shape, with their distribution trajectory being circular. The arc surface faces the axis of the inner fixed pipe 15, and the axis of the lead screw 12 overlaps with the center of the inner fixed pipe 15. This synchronous clamping method with multiple arc-shaped abutting elements 8 ensures uniform force on the eccentric shaft during clamping, effectively avoiding the deformation problem of the eccentric shaft caused by uneven force in traditional fixtures, and significantly improving the pass rate of the processed parts. Furthermore, to prevent the lead screw 12 from rotating synchronously when the lead screw nut 9 rotates, a groove 22 is provided on one side of the lead screw 12, and a sliding block 13 is slidably installed in the groove 22. The sliding block 13 penetrates the side wall of the connecting pipe 11 and is fixedly connected to the connecting pipe 11. The sliding engagement between the sliding block 13 and the sliding groove 22 guides and limits the lead screw 12, ensuring that the lead screw 12 only performs smooth linear motion.

[0089] During clamping, to improve the rotational stability of the gear assembly 6 on the inner fixed tube 15, multiple fixing blocks 16 are evenly spaced on the inner fixed tube 15. An annular groove 7 is formed on the inner circumferential side wall of the gear assembly 6, and the fixing blocks 16 are all positioned within the annular groove 7. The sliding fit between the fixing blocks 16 and the annular groove 7 guides and limits the gear assembly 6, ensuring smooth rotation on the inner fixed tube 15, preventing deviation, and guaranteeing the transmission stability of the linkage mechanism. Simultaneously, to improve the overall installation stability of the inner fixed tube 15 within the fixed tube 1, a fixing ring 21 is fixedly connected to the rear end of the fixed tube 1. Multiple fixing plates 17 are evenly spaced at the front end of the fixed tube 1, and these fixing plates 17 are all fixedly connected to the inner fixed tube 15, further reinforcing the inner fixed tube 15 and effectively preventing it from shaking during processing, thereby ensuring the machining accuracy of the eccentric shaft. These structural designs collectively solve the problems of insufficient installation stability and short service life of the core components of traditional fixtures.

[0090] After the eccentric shaft is clamped in place, the operator needs to adjust the eccentricity according to the processing requirements. At this point, the eccentric mechanism comes into play. The eccentric mechanism includes a movable frame 18 located at the rear end of the fixed pipe fitting 1. An adjusting screw 19 is rotatably sleeved inside the movable frame 18. A movable block 20 is threaded onto the adjusting screw 19, and the movable block 20 is slidably installed inside the movable frame 18 and fixedly connected to the fixed pipe fitting 1. By rotating the adjusting screw 19, the operator drives the movable block 20 to slide precisely within the movable frame 18, thereby driving the fixed pipe fitting 1 to move synchronously. The movement of the fixed pipe fitting 1 adjusts the processing eccentricity accuracy of the eccentric shaft. This eccentricity adjustment method, achieved through the adjusting screw 19 and the movable block 20, provides high-precision linear displacement, enabling the fixture to accurately adapt to processing requirements with different eccentricities, significantly improving the fixture's versatility and avoiding the additional production costs associated with designing dedicated fixtures for different eccentric shaft specifications.

[0091] Once the eccentric shaft is clamped in place and the eccentricity adjustment is complete, the operator tightens the two nuts 4 in the control mechanism. These two nuts 4 are respectively located at the upper and lower ends of the support frame 3. By tightening them, the screw 5 is firmly fixed to the support frame 3, thereby fixing the position of the rack 2 and locking the rotation state of the gear assembly 6, ensuring the stability of the entire clamping system and ensuring that the eccentric shaft will not shift during processing.

[0092] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0093] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0094] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A tooling fixture for machining an eccentric shaft for a hydraulic motor, comprising a fixed pipe fitting (1), characterized in that, The fixed pipe fitting (1) has an adjustment mechanism on one side, and a rack (2) is provided on the adjustment mechanism. An inner fixed pipe (15) is fixed inside the fixed pipe fitting (1). A gear assembly (6) is rotatably sleeved on the inner fixed pipe (15). An opening (14) is opened on one side of the fixed pipe fitting (1). The rack (2) passes through the opening (14) and meshes with the gear assembly (6). The fixed pipe (1) has a connecting pipe (11) on one side, and a linkage mechanism is provided on the connecting pipe (11). The linkage mechanism is connected to the gear assembly (6). The linkage mechanism is provided with a lead screw (12). One end of the lead screw (12) extending into the inner fixed pipe (15) is fixed with an abutment (8). The rear end of the fixed pipe fitting (1) is provided with an eccentric mechanism.

2. The tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 1, characterized in that, The control mechanism is used to drive the gear assembly (6) to rotate. The control mechanism drives the rack (2) to slide up and down, thereby driving the gear assembly (6) to rotate stably on the inner fixed tube (15).

3. The tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 1, characterized in that, The linkage mechanism is used to convert the rotation of the gear assembly (6) into the linear motion of the lead screw (12), and the abutment (8) achieves clamping and positioning of the eccentric shaft through the linear motion of the lead screw (12).

4. The tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 1, characterized in that, The eccentric mechanism is used to adjust the machining eccentricity of the eccentric shaft. The position of the fixed pipe (1) is adjusted by adjusting the eccentric mechanism, thereby adjusting the machining eccentricity accuracy of the eccentric shaft.

5. A tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 4, characterized in that, The eccentric mechanism includes a movable frame (18) located at the rear end of the fixed pipe (1). An adjusting screw (19) is rotatably sleeved inside the movable frame (18). A movable block (20) is threaded onto the adjusting screw (19). The movable block (20) is slidably installed inside the movable frame (18). The movable block (20) and the fixed pipe (1) are fixedly connected. By rotating the adjusting screw (19), the movable block (20) is driven to slide inside the movable frame (18), thereby driving the fixed pipe (1) to move synchronously and achieving precise adjustment of the eccentricity.

6. The tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 1, characterized in that, The fixed pipe fitting (1) has a fixed ring (21) fixed at its rear end. The fixed ring (21) is fixedly connected to the inner fixed pipe (15) to improve the installation stability of the inner fixed pipe (15) in the fixed pipe fitting (1). The front end of the fixed pipe fitting (1) is provided with multiple fixed plates (17) at equal intervals. All the multiple fixed plates (17) are fixedly connected to the inner fixed pipe (15) to further strengthen the inner fixed pipe (15), prevent it from shaking during processing, and ensure the processing accuracy of the eccentric shaft.

7. A tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 2, characterized in that, Multiple fixing blocks (16) are provided at equal intervals on the inner fixing tube (15). An annular groove (7) is provided on the inner side wall of the gear assembly (6). Multiple fixing blocks (16) are all set in the annular groove (7). Through the sliding cooperation between the fixing blocks (16) and the annular groove (7), the gear assembly (6) is guided and limited, ensuring that the gear assembly (6) rotates smoothly on the inner fixing tube (15), avoiding deviation, and ensuring the transmission stability of the linkage mechanism.

8. The tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 1, characterized in that, The control mechanism includes a support frame (3) fixed on one side of the fixed pipe (1). A guide hole is provided in the support frame (3). A screw (5) is slidably installed in the guide hole. The lower end of the screw (5) is fixed to the upper end of the rack (2). Two nuts (4) are threaded onto the screw (5). The two nuts (4) are respectively set at the upper and lower ends of the support frame (3). By tightening the two nuts (4), the screw (5) is fixed on the support frame (3), thereby fixing the position of the rack (2) and locking the rotation state of the gear assembly (6) to ensure clamping stability.

9. A tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 3, characterized in that, The linkage mechanism includes a lead screw nut (9) rotatably sleeved on the connecting pipe (11), a helical gear (10) fixed on the lead screw nut (9), an end gear plate (23) fixed on one side of the gear assembly (6), the helical gear (10) and the end gear plate (23) meshing, the lead screw (12) slidingly installed in the connecting pipe (11), and the lead screw (12) threadedly sleeved in the lead screw nut (9); when the gear assembly (6) rotates, it drives the end gear plate (23) to rotate synchronously, the end gear plate (23) drives the helical gear (10) to rotate, and then drives the lead screw nut (9) to rotate, so that the lead screw (12) moves linearly along the connecting pipe (11), driving the contacting member (8) to approach or move away from the eccentric shaft, thereby realizing the clamping or releasing action.

10. A tooling fixture for machining an eccentric shaft for a hydraulic motor according to claim 9, characterized in that, A groove (22) is provided on one side of the lead screw (12), and a sliding block (13) is slidably installed in the groove (22). The sliding block (13) passes through the side wall of the connecting pipe (11) and is fixedly connected to the connecting pipe (11). Through the sliding cooperation between the sliding block (13) and the groove (22), the lead screw (12) is guided and limited, preventing the lead screw (12) from rotating synchronously with the lead screw nut (9) and ensuring that the lead screw (12) makes a smooth linear motion. The connecting pipe (11) is provided with three parts that are fixed at equal intervals on one side of the fixed pipe (1). The three abutting parts (8) are arranged in an arc shape and the distribution trajectory is circular. The arc surface faces the axis of the inner fixed pipe (15). The axis of the lead screw (12) and the center of the inner fixed pipe (15) are overlapped.

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