Valve guide surface friction and wear testing machine

Abstract

The utility model relates to the technical field of engine parts testing, specifically is a valve guide rod surface friction and wear testing machine, including frame and fixed test bench on the frame, be provided with the guide seat on the frame, the guide seat inside slide joint has the cylinder type sliding block, the cylinder type sliding block drives the horizontal reciprocating movement in the guide seat through the first drive mechanism, the end of cylinder type sliding block is provided with the centering clamping mechanism for the valve guide rod circumferential clamping and coaxial positioning, the centering clamping mechanism includes the mandrel rotationally installed in the cylinder type sliding block inside, the mandrel is driven rotation through the second drive mechanism, is provided with the taper external thread head on the mandrel, the utility model discloses through the centering clamping mechanism design, has realized the quick clamping of valve guide rod sample, automatic centering and nondestructive clamping, effectively solved the technical problem that the traditional clamping mode exists and is poor in the centering accuracy, the operation is complicated, and the general property is insufficient, improved test efficiency and accuracy significantly.

Description

Technical Field

[0001] This utility model relates to the field of engine component testing technology, specifically a valve guide rod surface friction and wear testing machine. Background Technology

[0002] The valve guide rod is a core guiding component of the engine valve system, and its frictional wear performance with the valve stem directly affects the engine's sealing performance, fuel economy, and reliability. Laboratory testing using a testing machine to simulate operating conditions is a crucial method for evaluating the performance of new materials and processes. During this process, ensuring the guide rod specimen is quickly and reliably clamped onto the moving end of the testing machine, and maintaining a high degree of coaxiality between its axis and the reciprocating axis of the drive system, is a vital prerequisite for obtaining accurate test data. Coaxiality deviations can cause abnormal bending stress on the specimen, resulting in uneven wear and distorted test results.

[0003] The commonly used clamping methods have obvious shortcomings: First, using V-blocks or simple bushings with set screws for fixing requires manual adjustment with a dial indicator, which is cumbersome, time-consuming, and has poor accuracy and repeatability, resulting in low efficiency. Second, custom-made fixtures for specific samples can ensure the accuracy of a single model, but they have poor versatility and are difficult to adapt to the needs of multi-variety research and development. Third, using a three-jaw chuck for clamping is designed for rotating equipment, and when used for reciprocating testing, it has problems such as insufficient clamping stability, difficulty in ensuring coaxiality, and easy damage to the sample.

[0004] Therefore, a clamping mechanism that can quickly clamp, automatically center, and adapt to samples of different sizes is needed to solve the problems of low clamping efficiency, poor centering accuracy, and insufficient versatility in the existing technology. To this end, we provide a valve guide rod surface friction and wear testing machine to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a valve guide rod surface friction and wear testing machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A valve guide rod surface friction and wear testing machine includes a frame and a test table fixed on the frame. A guide seat is provided on the frame, and a cylindrical slider is slidably engaged in the guide seat. The cylindrical slider is driven to move horizontally reciprocally within the guide seat by a first driving mechanism. A centering clamping mechanism for circumferentially clamping and coaxially positioning the valve guide rod is provided at the end of the cylindrical slider. The centering clamping mechanism includes a spindle rotatably installed inside the cylindrical slider. The spindle is driven to rotate by a second driving mechanism. A tapered external thread head is provided on the spindle. A plurality of internally threaded arc-shaped plates are movably engaged in the tapered external thread head and engaged in the external thread with the external thread. Arc-shaped clamping plates for clamping the valve guide rod are provided on the internally threaded arc-shaped plates.

[0008] A valve guide rod surface friction and wear testing machine as described above: the first drive mechanism includes a first motor fixed on the frame, an eccentric wheel rotatably mounted on the frame on the output shaft of the first motor, a slide block slidably mounted on the frame via a limiting component, a connecting rod between the slide block and the eccentric wheel, the two ends of the connecting rod being hinged to the slide block and the eccentric wheel respectively, and the slide block being fixedly connected to the cylindrical slider via the connecting rod.

[0009] A valve guide rod surface friction and wear testing machine as described above: the limiting assembly includes two guide rods fixed between the frame and the guide seat, the guide rods being disposed through the slide.

[0010] A valve guide rod surface friction and wear testing machine as described above: the second drive mechanism includes a driven gear fixed on a spindle, a second motor is provided on the cylindrical slider, and a drive gear extending to the inner wall of the cylindrical slider is provided at the output end of the second motor, the drive gear meshing with the driven gear.

[0011] A valve guide rod surface friction and wear testing machine as described above: multiple internal thread arc-shaped plates are circumferentially distributed at equal angles on the outer periphery of the tapered external thread head.

[0012] As described above, a valve guide rod surface friction and wear testing machine is provided with a guide block on the outer wall of the internal thread arc-shaped plate, and a guide groove with an inner surface size that matches the outer surface size of the guide block is opened in the inner wall of the cylindrical slider, and the guide block is movably embedded and snapped into the guide groove.

[0013] The valve guide rod surface friction and wear testing machine described above: the inner contour dimension of the arc-shaped clamp is adapted to the outer contour dimension of the valve guide rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention drives the spindle to rotate via a second drive mechanism. The spindle's threaded engagement with multiple internally threaded arc-shaped plates forces the arc-shaped plates to contract radially synchronously under the guidance of a guide block and guide groove. This, in turn, causes the arc-shaped clamping plate fixed to the spindle to uniformly grip the valve guide rod circumferentially. This mechanism automatically corrects and ensures that the axis of the valve guide rod is highly aligned with the axis of the reciprocating cylindrical slider of the drive system. This effectively eliminates the problems of uneven wear and distorted test data caused by misalignment, significantly improving test accuracy and reliability. Compared to the cumbersome process of relying on manual shim adjustment or custom tooling, this invention only requires driving the second motor to rotate the drive gear, which in turn drives the driven gear and spindle to rotate, quickly completing the clamping and releasing operations. The process is simple and rapid, significantly reducing the labor intensity and skill requirements of operators, and improving sample change and testing efficiency.

[0016] In addition, this utility model adopts a design in which multiple internally threaded arc-shaped pieces are distributed at equal angles around the outer periphery of the tapered external thread head. Its radial synchronous contraction clamping principle can adaptively clamp valve guide rods of different specifications within a certain diameter range. It can meet the R&D and testing needs of multiple varieties and small batches without changing the fixture, thus enhancing the flexibility and economy of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a valve guide rod surface friction and wear testing machine.

[0018] Figure 2 For a valve guide rod surface friction and wear testing machine Figure 1 A schematic diagram of the decomposed part of the structure.

[0019] Figure 3 This is a schematic diagram of the structure of a valve guide rod surface friction and wear testing machine after partial cross-section of the cylindrical slider.

[0020] Figure 4 This is a structural schematic diagram of a cylindrical slider based on a valve guide rod surface friction and wear testing machine, showing a further cross-sectional view of the cylindrical slider.

[0021] Figure 5 This is a cross-sectional view of the cylindrical slider and the internally threaded arc-shaped plate of a valve guide rod surface friction and wear testing machine.

[0022] In the diagram: 1. Frame; 2. Guide seat; 3. Cylindrical slider; 4. First motor; 5. Eccentric wheel; 6. Connecting rod; 7. Slide seat; 8. Guide rod; 9. Valve guide rod; 10. Spindle; 11. Driven gear; 12. Drive gear; 13. Second motor; 14. Tapered external thread head; 15. Internal thread arc-shaped plate; 16. Arc-shaped clamp; 17. Guide block; 18. Guide groove; 19. Test bench. Detailed Implementation

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

[0024] Please see Figures 1-5 As an embodiment of this utility model, a valve guide rod surface friction and wear testing machine includes a frame 1 and a test bench 19 fixed on the frame 1. A guide seat 2 is provided on the frame 1. A cylindrical slider 3 is slidably engaged in the guide seat 2. The cylindrical slider 3 is driven to move horizontally and reciprocally in the guide seat 2 by a first driving mechanism. A centering clamping mechanism for circumferentially clamping and coaxially positioning the valve guide rod 9 is provided at the end of the cylindrical slider 3. The centering clamping mechanism includes a spindle 10 rotatably installed inside the cylindrical slider 3. The spindle 10 is driven to rotate by a second driving mechanism. A tapered external thread head 14 is provided on the spindle 10. A plurality of internal thread arc-shaped plates 15 are movably engaged in the external thread of the tapered external thread head 14 and are engaged in the internal thread arc-shaped plates 15 inside the cylindrical slider 3. An arc-shaped clamping plate 16 for clamping the valve guide rod 9 is provided on the internal thread arc-shaped plates 15.

[0025] In this embodiment, during use, one end of the valve guide rod 9 extends into the test bench 19, and the other end is inserted into the inner side of multiple arc-shaped clamps 16. The spindle 10 is driven to rotate by the second drive mechanism. By utilizing the threaded pair of the spindle 10 and multiple internally threaded arc-shaped plates 15, the internally threaded arc-shaped plates 15 are forced to synchronously contract radially under the guidance and restriction formed by the guide block 17 and the guide groove 18. Thus, the arc-shaped clamps 16 fixed on it uniformly hug the other end of the valve guide rod 9 from the circumference and fix it. At the same time, it automatically corrects and ensures that the axis of the valve guide rod 9 is highly aligned with the axis of the reciprocating cylindrical slider 3 of the drive system. The cylindrical slider 3 is driven by the first drive mechanism to move horizontally back and forth in the guide seat 2, thereby driving one end of the valve guide rod 9 fixed on it to move back and forth in the test bench 19 to perform surface friction and wear tests.

[0026] As a further embodiment of this utility model, the first driving mechanism includes a first motor 4 fixed on the frame 1. An eccentric wheel 5 is rotatably mounted on the frame 1 on the output shaft of the first motor 4. A slide block 7 is slidably mounted on the frame 1 through a limiting component. A connecting rod 6 is provided between the slide block 7 and the eccentric wheel 5. The two ends of the connecting rod 6 are respectively hinged to the slide block 7 and the eccentric wheel 5. The slide block 7 is fixedly connected to the cylindrical slider 3 through the connecting rod.

[0027] In this embodiment, the first motor 4 is electrically connected to an external power source via a wire. Starting the first motor 4 drives the eccentric wheel 5 to rotate, and the rotational motion is converted into the linear reciprocating motion of the slide block 7 via the connecting rod 6, thereby driving the cylindrical slider 3 to make precise reciprocating motion along the guide seat 2.

[0028] As a further embodiment of this utility model, the limiting component includes two guide rods 8 fixed between the frame 1 and the guide seat 2, with the guide rods 8 passing through the slide seat 7.

[0029] In this embodiment, the guide rod 8 provides precise guidance for the slide 7, ensuring the straightness and stability of the slide 7's movement trajectory.

[0030] As a further embodiment of this utility model, the second driving mechanism includes a driven gear 11 fixed on the spindle 10, a second motor 13 is provided on the cylindrical slider 3, and a driving gear 12 extending to the inner wall of the cylindrical slider 3 is provided at the output end of the second motor 13. The driving gear 12 meshes with the driven gear 11.

[0031] In this embodiment, the second motor 13 is electrically connected to an external power source via a wire. When the second motor 13 is started, it drives the drive gear 12 to rotate. Through the meshing transmission between the drive gear 12 and the driven gear 11, the driven gear 11 is driven to rotate, thereby driving the spindle 10 to rotate precisely, thus achieving control of the clamping force.

[0032] As a further embodiment of this utility model, multiple internal thread arc-shaped pieces 15 are circumferentially distributed at equal angles on the outer periphery of the tapered external thread head 14.

[0033] In this embodiment, the design of the internally threaded arc-shaped plates 15 with equal angular distribution ensures the uniformity and central symmetry of the clamping force of the arc-shaped clamping plate 16, which is beneficial to achieving automatic centering.

[0034] As a further embodiment of this utility model, the outer wall of the internally threaded arc-shaped piece 15 is provided with a guide block 17, and the inner surface of the cylindrical slider 3 is provided with a guide groove 18 whose inner surface size matches the outer surface size of the guide block 17. The guide block 17 is movably embedded and snapped into the guide groove 18.

[0035] In this embodiment, the cooperation between the guide block 17 and the guide groove 18 restricts the circumferential rotation of the internal thread arc plate 15, ensuring that it can only move radially. When the tapered external thread head 14 rotates, it engages with the internal thread arc plate 15. Since the internal thread arc plate 15 cannot rotate circumferentially, it can move radially, thus realizing the precise conversion of rotational motion to linear motion.

[0036] As a further embodiment of this utility model, the inner contour dimensions of the arc-shaped clamp 16 are adapted to the outer contour dimensions of the valve guide rod 9.

[0037] In this embodiment, the matching contour dimensions of the arc-shaped clamping plate 16 and the valve guide rod 9 increase the contact area between them, which not only ensures the stability of clamping but also avoids sample damage that may be caused by point contact.

[0038] During operation, the valve guide rod 9 to be tested is first installed into the centering and clamping mechanism. The second motor 13 is started to drive the spindle 10 to rotate through gear transmission, so that the tapered external thread head 14 drives multiple internal thread arc-shaped plates 15 to retract radially along the guide groove 18. The arc-shaped clamping plate 16 clamps the valve guide rod 9 evenly from the circumference and automatically corrects its position. Then, the first motor 4 is started to drive the eccentric wheel 5 to rotate. In conjunction with the connecting rod 6 and the slide block 7, the cylindrical slider 3 and the clamped valve guide rod 9 make precise linear reciprocating motion, so that the valve guide rod 9 moves back and forth in the test bench 19 to simulate the actual working conditions for friction and wear testing. After the test is completed, the valve guide rod 9 can be quickly removed by reversing the operation.

[0039] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A valve guide surface friction and wear tester comprising a frame (1) and a test bed (19) fixed to the frame (1), characterized in that, The frame (1) is provided with a guide seat (2), and a cylindrical slider (3) is slidably engaged in the guide seat (2). The cylindrical slider (3) is driven to move horizontally back and forth in the guide seat (2) by a first driving mechanism. The end of the cylindrical slider (3) is provided with a centering clamping mechanism for circumferential clamping and coaxial positioning of the valve guide rod (9). The centering clamping mechanism includes a spindle (10) rotatably installed inside the cylindrical slider (3). The spindle (10) is driven to rotate by a second driving mechanism. The spindle (10) is provided with a tapered external thread head (14). The tapered external thread head (14) is threaded with multiple internal thread arc-shaped pieces (15) that are movably engaged in the cylindrical slider (3). The internal thread arc-shaped pieces (15) are provided with arc-shaped clamping plates (16) for clamping the valve guide rod (9).

2. A valve guide surface friction and wear tester according to claim 1 wherein, The first driving mechanism includes a first motor (4) fixed on the frame (1). An eccentric wheel (5) is rotatably mounted on the frame (1) on the output shaft of the first motor (4). A slide block (7) is slidably mounted on the frame (1) through a limiting component. A connecting rod (6) is provided between the slide block (7) and the eccentric wheel (5). The two ends of the connecting rod (6) are respectively hinged to the slide block (7) and the eccentric wheel (5). The slide block (7) is fixedly connected to the cylindrical slider (3) through the connecting rod.

3. A valve guide surface friction and wear tester according to claim 2, wherein The limiting assembly includes two guide rods (8) fixed between the frame (1) and the guide seat (2), and the guide rods (8) are arranged through the slide (7).

4. The valve guide surface friction and wear tester of claim 1, wherein, The second drive mechanism includes a driven gear (11) fixed on a spindle (10), a second motor (13) is provided on the cylindrical slider (3), and a drive gear (12) extending to the inner wall of the cylindrical slider (3) is provided at the output end of the second motor (13), and the drive gear (12) meshes with the driven gear (11).

5. The valve guide surface friction and wear tester of claim 1 wherein, Multiple internal thread arc-shaped pieces (15) are circumferentially distributed at equal angles on the outer periphery of the tapered external thread head (14).

6. The valve guide surface friction and wear tester of claim 1, wherein, The outer wall of the internally threaded arc-shaped piece (15) is provided with a guide block (17), and the inner surface of the cylindrical slider (3) is provided with a guide groove (18) whose inner surface size is adapted to the outer surface size of the guide block (17). The guide block (17) is movably embedded and snapped into the guide groove (18).

7. The valve guide surface friction and wear tester of claim 1 wherein, The inner contour dimensions of the arc-shaped clamp (16) are adapted to the outer contour dimensions of the valve guide rod (9).

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