Diesel steel piston torsional fatigue testing machine with enhanced safety protection

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By cooperating with the top and bottom clamping components and the torsion component, bidirectional or alternating torsion of the diesel steel piston is achieved, solving the problem of unidirectional torsion in existing testing machines, improving testing accuracy and piston detection reliability, and enhancing the compatibility and stability of the equipment.

CN224518396UActive Publication Date: 2026-07-17SHENZHEN ENPUDA IND SYST CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: SHENZHEN ENPUDA IND SYST CO LTD
Filing Date: 2025-09-17
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

The existing diesel steel piston torsional fatigue testing machine can only perform unidirectional torsion, which cannot accurately simulate the bidirectional alternating torsional load of the piston in actual operation, resulting in a large deviation between the test results and the actual working conditions.

Method used

The device employs a top clamping assembly and a bottom clamping assembly in conjunction with a torsion assembly. Through a hydraulic telescopic rod and a drive motor, a helical gear transmission is activated to achieve bidirectional or alternating torsion of the piston. Combined with an arc-shaped clamping plate and a limiting structure, it ensures clamping stability and compatibility.

Benefits of technology

It achieves accurate simulation of piston torsional fatigue performance, improves the accuracy of the test and the reliability of piston quality inspection, enhances the compatibility and stability of the equipment, and reduces the impact of vibration.

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Abstract

This utility model discloses a diesel steel piston torsional fatigue testing machine with enhanced safety protection, belonging to the technical field of fatigue testing machines. The utility model includes a frame, with a top clamping assembly and a bottom clamping assembly fixedly connected to the top and bottom of the frame's inner cavity, respectively. A torsional assembly meshes between the top and bottom clamping assemblies. The top clamping assembly includes a hydraulic telescopic rod fixedly connected to the top of the frame's inner cavity, and a connecting cylinder is movably connected to the bottom of the hydraulic telescopic rod via a bearing. The utility model uses a drive motor to rotate a helical gear, which, through meshing with the two helical gears, drives the gear ring of the top clamping assembly and the rotating gear of the bottom clamping assembly, respectively, forming a bidirectional torsional force. This reduces the deviation between the test conditions and actual usage conditions, thus more accurately reflecting the true torsional fatigue performance of the piston and providing a more reliable basis for piston quality inspection.

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Description

Technical Field

[0001] This utility model belongs to the field of fatigue testing machine technology, and in particular relates to a diesel steel piston torsional fatigue testing machine with enhanced safety protection. Background Technology

[0002] During the operation of a diesel engine, the diesel steel piston, as a core moving component, must withstand cyclic torsional loads for extended periods. Its torsional fatigue performance directly determines the engine's service life and operational safety. Therefore, after the diesel steel piston is manufactured, it must undergo torsional fatigue testing using a torsional fatigue testing machine to verify whether it meets design and usage requirements. This testing step has become a crucial process in the quality inspection of diesel steel pistons. Chinese patent application CN213181075U discloses a novel torsional fatigue testing machine, belonging to the technical field of torsional fatigue testing machines. The machine includes a housing with a worktable at the top. A glass cover is mounted on the upper part of the worktable. A torsional device is located on one side of the upper part of the worktable, comprising a torsional clamp. A fixing device is located to the right of the torsional clamp, and a lever is located to the right of the fixing device. The fixing device is connected to the lever via a rope. Both the fixing device and the lever are mounted on the worktable. This novel torsional fatigue testing machine effectively optimizes the equipment structure, eliminates the need for a buffer device, reduces the equipment weight, and facilitates installation and movement.

[0003] This patent can only perform unidirectional torsion during torsional fatigue testing. This unidirectional torsion method is difficult to simulate the bidirectional alternating torsional load that diesel steel pistons experience in actual operation. As a result, there is a large deviation between the test conditions and the actual use conditions, and it cannot accurately reflect the true torsional fatigue performance of the piston.

[0004] To address these issues, we have developed a diesel steel piston torsional fatigue testing machine with enhanced safety features. Utility Model Content

[0005] The purpose of this invention is to provide a diesel steel piston torsional fatigue testing machine with enhanced safety protection. By cooperating with the top clamping assembly, the bottom clamping assembly and the torsion assembly, it solves the problem that the torsion assembly of the existing testing machine can only drive the top clamping assembly or the bottom clamping assembly to rotate in one direction.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a diesel steel piston torsional fatigue testing machine with enhanced safety protection, comprising a frame. A top clamping assembly and a bottom clamping assembly are fixedly connected to the top and bottom of the frame's inner cavity, respectively. A torsion assembly engages between the top and bottom clamping assemblies. The top clamping assembly includes a hydraulic telescopic rod fixedly connected to the top of the frame's inner cavity. The bottom of the hydraulic telescopic rod is movably connected to a connecting cylinder via a bearing. A connecting pin is inserted into the inner cavity of the connecting cylinder. A limiting component is fixedly connected to the surface of the connecting cylinder. A gear ring is fixedly connected to the top of the connecting cylinder's surface. The bottom clamping assembly includes components fixed via a bearing. A rotating gear is connected to the bottom of the inner cavity of the frame. A limiting groove is formed on the top of the rotating gear, and a clamping plate is slidably connected to the inner cavity of the limiting groove. A second hydraulic telescopic rod is fixedly connected to the surface of the clamping plate, and the bottom of the second hydraulic telescopic rod is fixedly connected to the rotating gear via a mounting seat. The torsion assembly includes a first spur gear meshing with a gear ring and a second spur gear meshing with the rotating gear. A connecting shaft is fixedly connected to the opposite side of both the first and second spur gears. A first helical gear is fixedly connected to the opposite end of each of the two connecting shafts. A second helical gear meshes between the two first helical gears. A drive motor is fixedly connected to one side of the second helical gear. The present invention is further configured such that the limiting member includes a groove formed on the surface of the connecting cylinder, a pin is slidably connected to the inner cavity of the groove, a spring is fixedly connected to one side of the pin, and the other end of the spring is fixedly connected to the inner wall of the groove. Under the action of the spring force, the pin can automatically engage with the pin hole of the connecting pin, thereby realizing the quick locking of the connecting pin and the connecting cylinder. At the same time, the groove structure facilitates the flexible sliding of the pin. When disassembly is required, the locking can be released simply by moving the pin, thus improving the convenience of piston clamping and disassembly.

[0008] The present invention is further provided that both sides of the connecting cylinder are provided with round holes for the connecting pin to pass through, and the round holes provide a through channel for the connecting pin.

[0009] The present invention is further configured such that the surface of the connecting pin is provided with a pin hole for the pin rod to pass through, and the pin hole cooperates with the pin rod of the limiting member to form a mechanical locking structure.

[0010] The present invention is further configured such that the clamping plate adopts an arc-shaped design and is evenly distributed around the circumference. The arc-shaped clamping plate has a higher degree of fit with the outer circular surface of the piston bottom, which can increase the contact area and reduce the local pressure.

[0011] The present invention is further configured such that a bearing seat is fixedly connected to the surface of the connecting shaft, and the bottom of the bearing seat is fixedly connected to the frame, thereby providing stable support for the connecting shaft.

[0012] The present invention is further provided that the bottom of the drive motor is fixedly connected to a mounting base, the bottom of the mounting base is fixedly connected to the frame, and the mounting base can reduce the vibration transmission during motor operation and avoid the vibration from affecting the stability of the frame structure and other components.

[0013] The present invention has the following beneficial effects.

[0014] 1. The drive motor of this utility model drives the second helical gear to rotate. Through the meshing transmission with the two first helical gears, the first and second spur gears drive the gear ring of the top clamping assembly and the rotating gear of the bottom clamping assembly respectively, forming a bidirectional torsional force. This reduces the deviation between the test conditions and the actual use conditions, thereby more accurately reflecting the true torsional fatigue performance of the piston and providing a more reliable basis for piston quality testing.

[0015] 2. The top clamping assembly of this utility model can be adjusted in height by a hydraulic telescopic rod, which can facilitate the quick and easy installation of diesel steel pistons. The bottom clamping assembly uses a hydraulic telescopic rod to push the arc-shaped clamping plate to slide along the limiting groove, which can adapt to the bottom of pistons of various diameters. The clamping plates distributed equidistantly around the circumference can ensure uniform clamping force. This flexible clamping design not only improves the compatibility of the equipment with different types of pistons, but also keeps the piston stable during the torsion test, avoiding the impact of unstable clamping on the test accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 A three-dimensional view of a diesel steel piston torsional fatigue testing machine designed to enhance safety.

[0018] Figure 2 Rear view of a diesel steel piston torsional fatigue testing machine designed to enhance safety.

[0019] Figure 3 A cross-sectional schematic diagram of a diesel steel piston torsional fatigue testing machine designed to enhance safety.

[0020] Figure 4 A three-dimensional view of the bottom clamping assembly in a diesel steel piston torsional fatigue testing machine designed to enhance safety.

[0021] Figure 5 A three-dimensional schematic diagram of the top clamping assembly in a diesel steel piston torsional fatigue testing machine designed to enhance safety.

[0022] In the attached diagram: 1. Frame; 2. Top clamping assembly; 21. Hydraulic telescopic rod one; 22. Connecting cylinder; 23. Connecting pin; 24. Limiting component; 241. Slide groove; 242. Pin; 243. Spring; 25. Gear ring; 3. Bottom clamping assembly; 31. Rotary gear; 32. Limiting groove; 33. Clamping plate; 34. Hydraulic telescopic rod two; 4. Torsion assembly; 41. Spur gear one; 42. Spur gear two; 43. Connecting shaft; 44. Helical gear one; 45. Helical gear two; 46. Drive motor; 47. Bearing seat. Detailed Implementation

[0023] The technical solutions of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1 Please see Figure 1-5 This utility model relates to a diesel steel piston torsional fatigue testing machine with enhanced safety protection. It includes a frame 1, with a top clamping assembly 2 and a bottom clamping assembly 3 fixedly connected to the top and bottom of the inner cavity of the frame 1, respectively. A torsion assembly 4 meshes between the top clamping assembly 2 and the bottom clamping assembly 3. The top clamping assembly 2 includes a hydraulic telescopic rod 21 fixedly connected to the top of the inner cavity of the frame 1. A connecting cylinder 22 is movably connected to the bottom of the hydraulic telescopic rod 21 via a bearing. A connecting pin 23 is inserted into the inner cavity of the connecting cylinder 22. A limiting member 24 is fixedly connected to the surface of the connecting cylinder 22, and a gear ring 25 is fixedly connected to the top of the surface of the connecting cylinder 22. The bottom clamping assembly 3 includes components fixedly connected to the bottom of the inner cavity of the frame 1 via bearings. The rotating gear 31 has a limiting groove 32 on its top. A clamping plate 33 is slidably connected to the inner cavity of the limiting groove 32. A hydraulic telescopic rod 34 is fixedly connected to the surface of the clamping plate 33. The bottom of the hydraulic telescopic rod 34 is fixedly connected to the rotating gear 31 through a mounting seat. The torsion assembly 4 includes a spur gear 41 that meshes with the gear ring 25 and a spur gear 42 that meshes with the rotating gear 31. A connecting shaft 43 is fixedly connected to the opposite side of the spur gear 41 and the spur gear 42. A helical gear 44 is fixedly connected to the opposite end of the two connecting shafts 43. A helical gear 45 meshes between the two helical gears 44. A drive motor 46 is fixedly connected to one side of the helical gear 45.

[0025] Specifically: The frame 1 is made of high-strength alloy steel welded together. The top clamping assembly 2 and the bottom clamping assembly 3 are vertically coaxially distributed. The top of the rotating gear 31 has four limiting grooves 32 along the circumferential direction. The outer arc surface of the clamping plate 33 is welded to the hydraulic telescopic rod 34. The module and number of teeth of the spur gear 41 and the spur gear 42 are matched.

[0026] Example 2 Please see Figure 1-5 Based on Embodiment 1, the limiting member 24 includes a groove 241 formed on the surface of the connecting cylinder 22. A pin 242 is slidably connected to the inner cavity of the groove 241. A spring 243 is fixedly connected to one side of the pin 242. The other end of the spring 243 is fixedly connected to the inner wall of the groove 241. Both sides of the connecting cylinder 22 are provided with round holes for the connecting pin 23 to pass through. The surface of the connecting pin 23 is provided with pin holes for the pin 242 to pass through. The clamping plate 33 adopts an arc-shaped design and is evenly distributed around the circumference. A bearing seat 47 is fixedly connected to the surface of the connecting shaft 43. The bottom of the bearing seat 47 is fixedly connected to the frame 1. A mounting base is fixedly connected to the bottom of the drive motor 46. The bottom of the mounting base is fixedly connected to the frame 1.

[0027] Specifically: Under the elastic force of spring 243, pin 242 can automatically engage with the pin hole of connecting pin 23, realizing quick locking between connecting pin 23 and connecting cylinder 22. At the same time, the structure of sliding groove 241 facilitates flexible sliding of pin 242. When disassembly is required, simply move pin 242 to release the lock, improving the convenience of piston clamping and disassembly. The round hole provides a through channel for connecting pin 23. The pin hole and the pin 242 of limiting member 24 cooperate to form a mechanical locking structure. The arc-shaped clamping plate 33 has a higher fit with the outer circular surface of the piston bottom, which can increase the contact area and reduce local pressure. The bearing seat 47 provides stable support for connecting shaft 43. The mounting seat can reduce the vibration transmission during motor operation and avoid vibration affecting the stability of frame 1 structure and other components.

[0028] The working principle of this utility model is as follows: First, the top of the diesel steel piston is inserted into the connecting cylinder 22. The connecting pin 23 passes through the connecting cylinder 22 and is initially fixed to the top of the piston. The pin 242 of the limiting member 24 is locked into the pin hole of the connecting pin 23 under the action of the spring 243. Then, the hydraulic telescopic rod 21 drives the top clamping assembly 2 and the diesel steel piston to move downward. When the bottom of the piston is placed on the rotating gear 31, the hydraulic telescopic rod 21 is stopped. Then, the hydraulic telescopic rod 34 pushes the clamping plate 33 to slide along the limiting groove 32 until the piston is clamped. The holding plate 33 clamps the bottom of the piston to fix it in place. Then, the drive motor 46 is started. Its output shaft drives the second helical gear 45 to rotate. The second helical gear 45 meshes with two first helical gears 44 at the same time. Through the connecting shaft 43, it drives the first spur gear 41 and the second spur gear 42 to rotate respectively. The first spur gear 41 meshes with the gear ring 25 on the surface of the connecting cylinder 22, driving the top clamping assembly 2 to rotate. The second spur gear 42 meshes with the rotating gear 31, driving the bottom clamping assembly 3 to rotate. The two form opposite or alternating rotational motions, applying bidirectional alternating torsional loads to the piston.

[0029] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. Diesel steel piston torsion fatigue testing machine with enhanced safety protection, comprising a frame (1), characterized in that: The top and bottom of the inner cavity of the frame (1) are respectively fixedly connected to a top clamping assembly (2) and a bottom clamping assembly (3), and a torsion assembly (4) is engaged between the top clamping assembly (2) and the bottom clamping assembly (3). The top clamping assembly (2) includes a hydraulic telescopic rod (21) fixedly connected to the top of the inner cavity of the frame (1). The bottom of the hydraulic telescopic rod (21) is movably connected to a connecting cylinder (22) via a bearing. A connecting pin (23) is inserted into the inner cavity of the connecting cylinder (22). A limiting member (24) is fixedly connected to the surface of the connecting cylinder (22). A toothed ring (25) is fixedly connected to the top of the surface of the connecting cylinder (22). The bottom clamping assembly (3) includes a rotating gear (31) fixedly connected to the bottom of the inner cavity of the frame (1) by a bearing. A limiting groove (32) is provided on the top of the rotating gear (31). A clamping plate (33) is slidably connected to the inner cavity of the limiting groove (32). A hydraulic telescopic rod (34) is fixedly connected to the surface of the clamping plate (33). The bottom of the hydraulic telescopic rod (34) is fixedly connected to the rotating gear (31) by a mounting seat. The torsion assembly (4) includes a spur gear one (41) meshing with a gear ring (25) and a spur gear two (42) meshing with a rotating gear (31). A connecting shaft (43) is fixedly connected to one side of each of the spur gear one (41) and the spur gear two (42). A helical gear one (44) is fixedly connected to one end of each of the two connecting shafts (43). A helical gear two (45) meshes between the two helical gears one (44). A drive motor (46) is fixedly connected to one side of the helical gear two (45).

2. The strengthened safety guarded diesel steel piston torsional fatigue testing machine according to claim 1, characterized in that: The limiting member (24) includes a groove (241) formed on the surface of the connecting cylinder (22). A pin (242) is slidably connected to the inner cavity of the groove (241). A spring (243) is fixedly connected to one side of the pin (242). The other end of the spring (243) is fixedly connected to the inner wall of the groove (241).

3. The strengthened safety guarded diesel steel piston torsional fatigue testing machine of claim 1, wherein: Both sides of the connecting cylinder (22) are provided with round holes for the connecting pin (23) to pass through.

4. The strengthened safety guarded diesel steel piston torsional fatigue testing machine of claim 1, wherein: The surface of the connecting pin (23) is provided with a pin hole through which the pin rod (242) passes.

5. The strengthened safety guarded diesel steel piston torsional fatigue testing machine of claim 1, wherein: The clamping plate (33) adopts an arc-shaped design and is evenly distributed around the circumference.

6. The diesel steel piston torsional fatigue testing machine with enhanced safety protection according to claim 1, characterized in that: The surface of the connecting shaft (43) is fixedly connected to a bearing seat (47), and the bottom of the bearing seat (47) is fixedly connected to the frame (1).

7. The strengthened safety guarded diesel steel piston torsional fatigue testing machine of claim 1, wherein: The bottom of the drive motor (46) is fixedly connected to a mounting base, and the bottom of the mounting base is fixedly connected to the frame (1).