Diesel engine top rod sleeve

Abstract

The present application relates to a kind of diesel engine ejector rod cover, belong to diesel engine ejector rod cover field, including fixed pipe, one end of the fixed pipe is fixedly connected with first bellow, the other end of the fixed pipe is fixedly connected with second bellow, the end of the second bellow is fixedly connected with first connector, one side of the first connector is fixedly connected with fixed flange, the other side of the first connector is provided with first sealing ring, the end of the first bellow is fixedly connected with nut, the inner surface of the nut is threadedly connected with second connector, the end surface of the second connector is fixedly connected with second sealing ring, the present application does not interfere with other pipeline, guarantee the shock absorption or shock resistance of first bellow and second bellow, also avoid the oil leakage or damage of first bellow and second bellow, and stress concentration caused by local point contact can be avoided, the damage of ejector rod and ejector rod cover can be avoided, so as to not easy to damage lubricating oil film, improve the reliability and life of engine.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine pushrod sleeves, specifically, it relates to a diesel engine pushrod sleeve. Background Technology

[0002] The pushrod sleeve of a diesel engine, also known as a pushrod sleeve or tappet sleeve, is an important component in the valve train. It is mainly used to protect the pushrod and guide its movement, ensuring that the valves open and close on time. During its installation, the clearance between the pushrod and the inner hole of the pushrod sleeve must be ensured to be within the standard range in the manual, such as 0.02-0.08mm. Then, apply engine oil to the pushrod and put it into the new sleeve. It should feel smooth and without any obstruction to the touch, and there should be no obvious amount of shaking.

[0003] During the above process, it is necessary to ensure that the pushrod sleeve and the pushrod are aligned to avoid tilting. When the pushrod first contacts the edge of the pushrod sleeve, if it is not fully aligned, the top of the pushrod and the opening of the pushrod sleeve will make local point contact, resulting in stress concentration, which makes the pushrod easy to be damaged, thereby easily destroying the lubricating oil film, leading to abnormal wear, and directly affecting the reliability and life of the engine.

[0004] A search revealed that Chinese patent number CN205189979U discloses a pushrod sleeve assembly for a diesel engine in an internal combustion locomotive. Although it also uses a corrugated pushrod sleeve, its outer diameter is constant. In actual installation and application, the corrugated pipe will interfere with the surrounding pipelines, which not only affects the vibration reduction or anti-vibration effect of the corrugated pipe, but also makes the corrugated pipe prone to oil leakage or damage under pressure. At the same time, damage to the pushrod and pushrod sleeve cannot be avoided during installation, and the above problems still exist. Summary of the Invention

[0005] The purpose of this invention is to provide a diesel engine pushrod sleeve that solves the problems existing in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions: A diesel engine pushrod sleeve includes a fixed tube, one end of which is fixedly connected to a first bellows, and the other end of which is fixedly connected to a second bellows. A first connector is fixedly connected to the end of the second bellows. A fixed flange is fixedly connected to one side of the first connector, and a first sealing ring is provided on the other side of the first connector. A nut is fixedly connected to the end of the first bellows, and a second connector is threaded onto the inner surface of the nut. A second sealing ring is fixedly connected to the end face of the second connector. A groove is formed on the inner surface of the fixed tube, and a slider is slidably connected within the groove. A return spring is provided between one end of the slider and the end face of the groove, and a ball bearing is sleeved on the other end of the slider.

[0007] Furthermore, the first corrugated pipe, the fixed pipe, and the second corrugated pipe are integrally formed by alternating corrugation, and the diameter of the fixed pipe is smaller than the diameter of the first corrugated pipe and the second corrugated pipe.

[0008] Furthermore, multiple grooves and sliders are provided, and the multiple grooves and multiple sliders are evenly distributed about the central axis of the fixed tube. The length of the slider extending out of the groove ranges from 0.02 to 0.08 mm.

[0009] Furthermore, the second connector has a sliding groove, a first sealing cavity, and a second sealing cavity. A connecting channel connects the first sealing cavity and the second sealing cavity. A positioning piston rod is slidably connected in the second sealing cavity, and a reset piston rod is slidably connected in the first sealing cavity. The reset piston rod extends into the sliding groove, and one end of a sliding rod is fixedly connected to the end of the reset piston rod. A pressure rod is fixedly connected to the other end of the sliding rod.

[0010] Furthermore, the pressure rod extends into the second sealing ring and is fixedly connected to the second sealing ring. The pressure rod is sleeved with the second connecting head, and the slide rod is slidably connected to the slide groove.

[0011] Furthermore, multiple pressure rods and positioning piston rods are provided, and the multiple pressure rods and multiple positioning piston rods are evenly distributed about the central axis of the second connector, and the pressure rods and positioning piston rods correspond one-to-one.

[0012] Furthermore, the positioning piston rod is inclined toward the central axis of the second connector, and the minimum inner diameter of the ring formed by the positioning piston rod is the inner diameter of the second connector minus 0.04~0.16mm.

[0013] The beneficial effects of this invention are: The present invention places the fixing pipe between other pipelines of the diesel engine. Because the outer diameter of the fixing pipe is smaller than the outer diameter of the first and second bellows, the push rod sleeve can still be stably installed in a narrow space. At the same time, the push rod sleeve does not interfere with other pipelines, ensuring the shock absorption or anti-vibration effect of the first and second bellows, and also avoiding oil leakage or damage to the first and second bellows. Then, the flange is fixed by bolt positioning, and the nut is fixed to the second connector to achieve the purpose of installing the push rod sleeve. In the above process, the length of the first and second bellows can be adjusted, which is convenient for installation and debugging.

[0014] In this invention, the push rod first contacts the positioning piston rod. The minimum inner diameter of the ring formed by the positioning piston rod is the inner diameter of the second connector minus 0.04~0.16mm. If the push rod is aligned with the second connector, it can smoothly pass through the positioning piston rod and be inserted into the push rod sleeve. At this time, the gap between the push rod and the push rod sleeve is 0.02~0.08mm. If the push rod is not aligned with the second connector, the positioning piston rod blocks the movement of the push rod, preventing it from contacting the push rod sleeve opening. This avoids stress concentration caused by local point contact, thus preventing damage to the push rod and the push rod sleeve. Consequently, it is less likely to damage the lubricating oil film, improving the reliability and lifespan of the engine. Then, the push rod is slid. When all the positioning piston rods no longer block the push rod, the push rod and the push rod sleeve automatically align, simplifying the alignment operation during installation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the nut structure of the present invention; Figure 3 This is a half-sectional schematic diagram of the second connector structure of the present invention; Figure 4 for Figure 3 Enlarged view of the structure of section A in the middle; Figure 5 This is a cross-sectional view of the groove structure of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 1. Fixed pipe; 2. First corrugated pipe; 3. Second corrugated pipe; 4. First connector; 5. Fixed flange; 6. First sealing ring; 7. Nut; 8. Second connector; 9. Second sealing ring; 10. Slide groove; 11. First sealing cavity; 12. Second sealing cavity; 13. Connecting channel; 14. Positioning piston rod; 15. Reset piston rod; 16. Slide rod; 17. Pressure rod; 18. Groove; 19. Slider; 20. Return spring; 21. Ball bearing. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please see Figure 1 , Figure 2 and Figure 5 As shown, the present invention provides a technical solution: a diesel engine pushrod sleeve, including a fixed tube 1, a first bellows 2 fixedly connected to one end of the fixed tube 1, a second bellows 3 fixedly connected to the other end of the fixed tube 1, a first connector 4 fixedly connected to the end of the second bellows 3, a fixed flange 5 fixedly connected to one side of the first connector 4, a first sealing ring 6 provided on the other side of the first connector 4, a nut 7 fixedly connected to the end of the first bellows 2, a second connector 8 threadedly connected to the inner surface of the nut 7, a second sealing ring 9 fixedly connected to the end face of the second connector 8, a groove 18 opened on the inner surface of the fixed tube 1, a slider 19 slidably connected in the groove 18, a return spring 20 provided between one end of the slider 19 and the end face of the groove 18, and a ball bearing 21 sleeved on the other end of the slider 19.

[0020] Please see Figure 1 As shown, the first corrugated pipe 2, the fixed pipe 1, and the second corrugated pipe 3 are integrally formed by alternating corrugation. The diameter of the fixed pipe 1 is smaller than the diameter of the first corrugated pipe 2 and the second corrugated pipe 3.

[0021] Please see Figure 5 As shown, there are multiple grooves 18 and sliders 19. The multiple grooves 18 and multiple sliders 19 are evenly distributed about the central axis of the fixed tube 1. The length of the slider 19 extending out of the groove 18 ranges from 0.02 to 0.08 mm.

[0022] Specifically, during the installation of the pushrod sleeve, the fixing pipe 1 is placed between other pipelines of the diesel engine. Because the outer diameter of the fixing pipe 1 is smaller than the outer diameter of the first bellows 2 and the second bellows 3, the pushrod sleeve can still be stably installed in the narrow space. At the same time, the pushrod sleeve does not interfere with other pipelines, ensuring the vibration reduction or anti-vibration effect of the first bellows 2 and the second bellows 3, and also avoiding oil leakage or damage to the first bellows 2 and the second bellows 3. Then, the flange 5 is fixed by bolt positioning, and the nut 7 is fixed to the second connector 8 to achieve the purpose of installing the pushrod sleeve. During the above process, the length of the first bellows 2 and the second bellows 3 can be adjusted, which is convenient for installation and debugging.

[0023] Example 2: Please see Figures 2-4As shown, the present invention provides a technical solution: a diesel engine pushrod sleeve, wherein a second connector 8 has a sliding groove 10, a first sealing cavity 11 and a second sealing cavity 12, and a connecting channel 13 connecting the first sealing cavity 11 and the second sealing cavity 12. A positioning piston rod 14 is slidably connected in the second sealing cavity 12, and a reset piston rod 15 is slidably connected in the first sealing cavity 11. The reset piston rod 15 extends into the sliding groove 10, and one end of a sliding rod 16 is fixedly connected to the end of the reset piston rod 15. A pressure rod 17 is fixedly connected to the other end of the sliding rod 16.

[0024] Please see Figure 4 As shown, the pressure rod 17 extends into the second sealing ring 9 and is fixedly connected to the second sealing ring 9. The pressure rod 17 is sleeved with the second connector 8, and the slide rod 16 is slidably connected to the slide groove 10.

[0025] Please see Figure 3 As shown, multiple pressure rods 17 and positioning piston rods 14 are provided. The multiple pressure rods 17 and multiple positioning piston rods 14 are evenly distributed about the central axis of the second connector 8, and the pressure rods 17 and positioning piston rods 14 correspond one-to-one.

[0026] Please see Figure 3 As shown, the positioning piston rod 14 is inclined toward the central axis of the second connector 8, and the minimum inner diameter of the ring formed by the positioning piston rod 14 is the inner diameter of the second connector 8 minus 0.04~0.16mm.

[0027] Specifically, during the installation of the pushrod, the pushrod is inserted into the pushrod sleeve. During this process, the pushrod will first contact the positioning piston rod 14. The minimum inner diameter of the ring formed by the positioning piston rod 14 is the inner diameter of the second connector 8 minus 0.04~0.16mm. If the pushrod is aligned with the second connector 8, the pushrod can smoothly pass through the positioning piston rod 14 and be inserted into the pushrod sleeve. At this time, the gap between the pushrod and the pushrod sleeve is 0.02~0.08mm. If the pushrod is not aligned with the second connector 8, the positioning piston rod 14 will block the movement of the pushrod, preventing the pushrod from contacting the pushrod sleeve opening. This avoids stress concentration caused by local point contact, thus preventing damage to the pushrod and the pushrod sleeve, and making it less likely to damage the lubricating oil film, improving the reliability and life of the engine. Then, the pushrod is slid. When all the positioning piston rods 14 no longer block the pushrod, the pushrod and the pushrod sleeve are automatically aligned, simplifying the alignment operation during installation.

[0028] Working principle of this invention: When the pushrod sleeve needs to be installed, the fixing pipe 1 is placed between other pipelines of the diesel engine. Because the outer diameter of the fixing pipe 1 is smaller than the outer diameter of the first bellows 2 and the second bellows 3, the pushrod sleeve can still be installed stably in the narrow space. At the same time, the pushrod sleeve does not interfere with other pipelines, ensuring the shock absorption or anti-vibration effect of the first bellows 2 and the second bellows 3, and also avoiding oil leakage or damage to the first bellows 2 and the second bellows 3. Then, the flange 5 is fixed by bolt positioning, and the nut 7 is fixed to the second connector 8 to achieve the purpose of installing the pushrod sleeve. During the above process, the length of the first bellows 2 and the second bellows 3 can be adjusted, which is convenient for installation and debugging. After the pushrod sleeve is installed, the pushrod is inserted into the pushrod sleeve. During this process, the pushrod will first contact the positioning piston rod 14. The minimum inner diameter of the ring formed by the positioning piston rod 14 is the inner diameter of the second connector 8 minus 0.04~0.16mm. If the pushrod is aligned with the second connector 8, the pushrod can pass smoothly through the positioning piston rod 14 and be inserted into the pushrod sleeve. At this time, the gap between the pushrod and the pushrod sleeve is 0.02~0.08mm. If the pushrod is not aligned with the second connector 8, the positioning piston rod 14 will block the movement of the pushrod, so that the pushrod cannot contact the opening of the pushrod sleeve. This avoids stress concentration caused by local point contact, which can avoid damage to the pushrod and the pushrod sleeve, thus making it less likely to damage the lubricating oil film and improving the reliability and life of the engine. Then, slide the pushrod. When all the positioning piston rods 14 no longer block the pushrod, the pushrod and the pushrod sleeve will automatically align, which simplifies the alignment operation during installation. It should be further explained that after the push rod and push rod sleeve are installed, the end of the second connector 8 is sealed, which causes the second sealing ring 9 to be compressed and contracted. This causes the pressure rod 17 inside the second sealing ring 9 to push the slide rod 16 to move, which causes the end of the slide rod 16 to drive the reset piston rod 15 to move. This causes the reset piston rod 15 to draw air from the second sealing cavity 12 through the connecting channel 13, creating a negative pressure at the end of the second sealing cavity 12. This allows the positioning piston rod 14 to retract into the second sealing cavity 12, avoiding affecting the sealing and installation of the second connector 8, thus completing the operation.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., 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, 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.

[0030] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A diesel engine pushrod sleeve, characterized in that: The device includes a fixed tube (1), one end of which is fixedly connected to a first corrugated tube (2), and the other end of which is fixedly connected to a second corrugated tube (3). The end of the second corrugated tube (3) is fixedly connected to a first connector (4), one side of which is fixedly connected to a fixed flange (5), and the other side of which is provided with a first sealing ring (6). The end of the first corrugated tube (2) is fixedly connected to a nut (7), and the inner surface of the nut (7) is threadedly connected to a second connector (8). The end face of the second connector (8) is fixedly connected to a second sealing ring (9). The inner surface of the fixed tube (1) is provided with a groove (18), and a slider (19) is slidably connected in the groove (18). A return spring (20) is provided between one end of the slider (19) and the end face of the groove (18), and a ball (21) is sleeved on the other end of the slider (19).

2. The diesel engine pushrod sleeve according to claim 1, characterized in that: The first corrugated pipe (2), the fixed pipe (1), and the second corrugated pipe (3) are integrally formed by intermittent corrugation. The diameter of the fixed pipe (1) is smaller than the diameter of the first corrugated pipe (2) and the second corrugated pipe (3).

3. The diesel engine pushrod sleeve according to claim 1, characterized in that: The groove (18) and slider (19) are provided in multiple ways. The multiple grooves (18) and multiple sliders (19) are evenly distributed about the central axis of the fixed tube (1). The length of the slider (19) extending out of the groove (18) is 0.02~0.08mm.

4. The diesel engine pushrod sleeve according to claim 1, characterized in that: The second connector (8) has a sliding groove (10), a first sealing cavity (11) and a second sealing cavity (12). A connecting channel (13) connects the first sealing cavity (11) and the second sealing cavity (12). A positioning piston rod (14) is slidably connected in the second sealing cavity (12). A reset piston rod (15) is slidably connected in the first sealing cavity (11). The reset piston rod (15) extends into the sliding groove (10), and one end of a slide rod (16) is fixedly connected to the end of the reset piston rod (15). A pressure rod (17) is fixedly connected to the other end of the slide rod (16).

5. A diesel engine pushrod sleeve according to claim 4, characterized in that: The pressure rod (17) extends into the second sealing ring (9) and is fixedly connected to the second sealing ring (9). The pressure rod (17) is sleeved with the second connector (8), and the slide rod (16) is slidably connected to the slide groove (10).

6. A diesel engine pushrod sleeve according to claim 4, characterized in that: Multiple pressure rods (17) and multiple positioning piston rods (14) are provided. The multiple pressure rods (17) and multiple positioning piston rods (14) are evenly distributed about the central axis of the second connector (8), and the pressure rods (17) and the positioning piston rods (14) correspond one-to-one.

7. A diesel engine pushrod sleeve according to claim 4, characterized in that: The positioning piston rod (14) is inclined toward the central axis of the second connector (8), and the minimum inner diameter of the ring formed by the positioning piston rod (14) is the inner diameter of the second connector (8) minus 0.04~0.16mm.

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