Diesel engine tappet

Abstract

The utility model discloses a diesel engine tappet, which relates to the technical field of diesel engines and comprises a tappet body, a mounting seat fixedly sleeved on the outer side of the tappet body, a shaft hole arranged on one side of the tappet body, a rolling shaft mounted inside the shaft hole, a fixing seat movably connected with the other end of the rolling shaft, a fixing component mounted on one side of the fixing seat, and a roller mounted on the outer side of the rolling shaft. Threaded holes are symmetrically formed in the top of the mounting base, fixing bolts are in threaded connection with the interiors of the threaded holes, fixing blocks are symmetrically and fixedly connected to the top of the mounting base, limiting assemblies are installed in the fixing blocks, and a tappet is fixedly connected to the bottom of the tappet body. With the adoption of the structure, the bolt can be effectively prevented from loosening under the action of long-term vibration, the displacement of the bolt can be limited, the connection between the tappet and a mounting part is always kept tight and stable, the shaking or displacement of the tappet caused by the loosening of the bolt is avoided, and the service life of the tappet is prolonged. And therefore, abnormal friction and collision between the tappet and surrounding components are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of diesel engine technology, and specifically relates to a diesel engine tappet. Background Technology

[0002] The tappet is a crucial component of the valve train in a diesel engine. Its primary function is to convert the rotational motion of the camshaft into linear motion, thereby opening and closing the valves. It is typically installed between the camshaft and the valve stem, directly contacting the camshaft, bearing the camshaft's thrust, and transmitting it to the pushrod or valve. Tappets come in various structural forms, commonly including cylindrical and roller types. Cylindrical tappets are simple in structure and lightweight, reducing inertial forces to some extent; roller tappets utilize rolling friction with the camshaft, effectively reducing wear and improving reliability and service life, making them particularly suitable for high-speed, high-load diesel engines. With the development of diesel engine technology, the requirements for tappet material properties and machining precision are continuously increasing to ensure stable operation under high-temperature, high-pressure, and high-speed conditions, guaranteeing the power and economy of the diesel engine.

[0003] Announcement No. "CN218912985U" discloses a novel roller tappet, comprising a tappet body with a shaft hole and an inner cavity. A roller is installed in the shaft hole, and a roller is mounted on the roller. The roller contacts a cam, which is mounted on a camshaft. The tappet body is installed in a tappet seat, which is mounted above the engine cover. The tappet seat has four threaded holes and is fixed to the engine with screws. The tappet body is connected to a tappet rod at the bottom. The tappet body is square, the inner cavity of the tappet seat is square, and the tappet seat is cylindrical in shape. The tappet seat is fixed to the engine. In this utility model, the square design of the tappet body and tappet seat effectively solves the problem of the roller tappet rotating during operation and affecting the operation of the roller. At the same time, the circular shape of the tappet seat makes installation very convenient.

[0004] While the aforementioned utility model effectively solves the problem of roller tappets rotating during operation and affecting the rollers' work, and also offers the advantage of a circular tappet seat for easy installation, diesel engines generate vibrations during operation. Under long-term vibration, the bolts are prone to gradually loosening. Loose bolts can cause changes in the installation position of the tappet, affecting its fit accuracy with components such as the camshaft and valve pushrods, thereby affecting the normal operation of the valve train, causing inaccurate valve opening and closing times, reducing the performance of the diesel engine. Furthermore, after the bolts loosen, the tappet may wobble or shift during operation, colliding or rubbing against surrounding components, leading to accelerated wear on the tappet itself, camshaft, valve pushrods, and other components, and potentially even causing damage to these parts. Utility Model Content

[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a diesel engine tappet to solve the problem that the diesel engine will vibrate during operation, and the bolts are prone to gradually loosening under long-term vibration. The loose bolts will cause the installation position of the tappet to change, affecting the fitting accuracy of its components such as camshaft and valve pushrod, which in turn affects the normal operation of the valve train, making the valve opening and closing time inaccurate and reducing the performance of the diesel engine.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A diesel engine tappet includes a tappet body, a mounting seat fixedly sleeved on the outer side of the tappet body, a shaft hole opened on one side of the tappet body, a roller installed inside the shaft hole, a fixed seat movably connected to the other end of the roller, a fixing component installed on one side of the fixed seat, a roller installed on the outer side of the roller, threaded holes symmetrically opened on the top of the mounting seat, fixing bolts threaded inside the threaded holes, fixing blocks symmetrically fixedly connected to the top of the mounting seat, a limit component installed inside the fixing block, and a tappet rod fixedly connected to the bottom of the tappet body;

[0008] The limiting assembly includes a cavity, a first return spring, a moving block, a limiting post, a connecting block, and a push block. The fixed block has a cavity inside, with the first return spring fixedly connected to one side of the cavity. The moving block is slidably connected to the cavity interior. A limiting post is fixedly connected to the other side of the moving block, with its other end extending out of the side of the fixed block. A connecting block is fixedly connected to the top of the moving block, with its other end extending out of the top of the fixed block and fixedly connected to a push block. A sliding groove is formed on the top of the fixed block, communicating with the cavity interior. The connecting block is slidably connected to the sliding groove. An annular limiting groove is formed on the outer wall of the fixing bolt, and the limiting post is inserted into the annular limiting groove. This effectively prevents the bolt from loosening under long-term vibration, limits bolt displacement, and ensures a tight and stable connection between the tappet and the installation location. It avoids tappet wobbling or displacement due to bolt loosening, thereby reducing abnormal friction and collision between the tappet and surrounding components and extending the service life of each component.

[0009] As a preferred technical solution, the fixing assembly includes a receiving cavity, a second return spring, a pressing plate, a locking block, and a pressing block. An assembly block is fixedly connected to the fixing seat near the roller. A receiving cavity is symmetrically formed inside the assembly block. A second return spring is symmetrically fixedly connected to one side of the receiving cavity. The other end of the second return spring is fixedly connected to the pressing plate. The pressing plate is slidably connected to the receiving cavity. A pressing block and a locking block are fixedly connected to the side of the pressing plate away from the second return spring. The other side of the pressing block extends outward from the outside of the assembly block, and the other side of the locking block extends outward from the outside of the fixing seat. An assembly groove is formed at one end of the roller. The assembly block and the assembly groove are inserted into each other. Locking slots are formed on both sides of the assembly groove. The locking block and the locking slots are locked into each other. The roller can be disassembled and assembled without complicated steps or tools. Replacing the roller restores the fit between the tappet and the camshaft to a good state, ensuring accurate valve opening and closing times and lift, making the engine's intake and exhaust processes smoother, thereby improving engine power output and fuel economy.

[0010] As a preferred technical solution, the roller is sleeved on the roller shaft, and the roller and the roller shaft have a clearance fit, which can ensure that the roller can rotate freely and flexibly on the roller shaft. The appropriate clearance can reduce the frictional resistance during rotation, making the roller rotate more smoothly, thereby accurately transmitting the camshaft movement to the valve mechanism, ensuring valve timing and the normal opening and closing of the valves.

[0011] In summary, the present invention has the following main advantages:

[0012] First, in this utility model, the push block moves the moving block and the limiting post through the connecting block. The moving block presses against the first return spring, the first return spring is compressed, and the limiting post retracts into the cavity. Then, the mounting base and the mounting surface are merged, and the fixing bolt is threaded into the threaded hole. When the push is released, the first return spring is reset, the moving block drives the limiting post to pop out, and the limiting post is inserted into the annular limiting groove for limiting. This can effectively prevent the bolt from loosening under long-term vibration, limit the displacement of the bolt, and keep the connection between the push post and the mounting part tight and stable. It avoids the push post from shaking or shifting due to bolt loosening, thereby reducing abnormal friction and collision between the push post and surrounding parts and extending the service life of each part.

[0013] Secondly, in this utility model, the roller is placed inside the tappet, and then the roller passes through the shaft hole through the roller and the tappet body. Then, the button is pressed, causing the button plate to move the locking block. The button plate presses against the second return spring, which is compressed, and the locking block retracts into the receiving cavity. Then, the fixing seat is joined with one end of the roller, and the assembly block is inserted into the assembly slot. The button is released, the second return spring returns to its original position, and the locking block pops out and engages with the slot. The roller can be disassembled and assembled without complicated steps or tools. Replacing the roller can restore the fit between the tappet and the camshaft to a good state, ensuring accurate valve opening and closing time and lift, making the intake and exhaust processes of the engine smoother, thereby improving the engine's power output and fuel economy. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a cross-sectional three-dimensional structural schematic diagram of the present invention;

[0016] Figure 3 This is the utility model Figure 2 Enlarged view of part A;

[0017] Figure 4 This is a cross-sectional three-dimensional structural diagram of the assembly block of this utility model.

[0018] Reference numerals: 1. Tappet body; 2. Roller; 3. Shaft hole; 4. Roller; 5. Fixing seat; 6. Assembly block; 7. Assembly groove; 8. Tappet; 9. Mounting seat; 10. Threaded hole; 11. Fixing bolt; 12. Fixing block; 13. Limiting component; 131. Cavity; 132. First return spring; 133. Moving block; 134. Limiting post; 135. Connecting block; 136. Push block; 14. Slide groove; 15. Annular limiting groove; 16. Fixing component; 161. Receiving cavity; 162. Second return spring; 163. Press plate; 164. Locking block; 165. Press block; 17. Locking groove. Detailed Implementation

[0019] Example

[0020] refer to Figures 1 to 4The diesel engine tappet described in this embodiment includes a tappet body 1, a mounting base 9 fixedly sleeved on the outer side of the tappet body 1, a shaft hole 3 opened on one side of the tappet body 1, a roller 4 installed inside the shaft hole 3, a fixed base 5 movably connected to the other end of the roller 4, a fixing component 16 installed on one side of the fixed base 5, a roller 2 installed on the outer side of the roller 4, threaded holes 10 symmetrically opened on the top of the mounting base 9, a fixing bolt 11 threadedly connected inside the threaded holes 10, a fixing block 12 symmetrically fixedly connected to the top of the mounting base 9, a limit component 13 installed inside the fixing block 12, and a tappet rod 8 fixedly connected to the bottom of the tappet body 1.

[0021] The limiting assembly 13 includes a cavity 131, a first return spring 132, a moving block 133, a limiting post 134, a connecting block 135, and a push block 136. The fixed block 12 has a cavity 131 inside. The first return spring 132 is fixedly connected to one side of the cavity 131, and the moving block 133 is fixedly connected to the other end of the first return spring 132. The moving block 133 is slidably connected to the cavity 131. The limiting post 134 is fixedly connected to the other side of the moving block 133, and the other end of the limiting post 134 extends out of the side of the fixed block 12. The connecting block 135 is fixedly connected to the top of the moving block 133, and the other end of the connecting block 135 extends out of the top of the fixed block 12 and is fixedly connected to the push block 136. The top of the fixed block 12 has a sliding groove 14. The groove 14 is connected to the interior of the cavity 131. The connecting block 135 is slidably connected to the sliding groove 14. The outer wall of the fixing bolt 11 is provided with an annular limiting groove 15. The limiting post 134 is inserted into the annular limiting groove 15. Pushing the push block 136 causes the moving block 133 and the limiting post 134 to move through the connecting block 135. The moving block 133 presses against the first return spring 132, and the first return spring 132 is compressed. The limiting post 134 retracts into the cavity 131. Then, the mounting base 9 is merged with the mounting surface, and the fixing bolt 11 is threadedly connected to the threaded hole 10. When the push is released, the first return spring 132 is reset, and the moving block 133 causes the limiting post 134 to pop out. The limiting post 134 is inserted into the annular limiting groove 15 for limiting.

[0022] refer to Figure 4The fixing assembly 16 includes a receiving cavity 161, a second return spring 162, a pressing plate 163, a locking block 164, and a pressing block 165. An assembly block 6 is fixedly connected to the fixing base 5 near the roller 4. The assembly block 6 has symmetrically formed receiving cavities 161 inside. A second return spring 162 is symmetrically fixedly connected to one side of the receiving cavity 161. The other end of the second return spring 162 is fixedly connected to the pressing plate 163. The pressing plate 163 is slidably connected to the inside of the receiving cavity 161. A pressing block 165 and a locking block 164 are fixedly connected to the side of the pressing plate 163 away from the second return spring 162. The other side of the pressing block 165 extends outward from the outside of the assembly block 6, and the other side of the locking block 164 extends outward from the outside of the fixing base 5. The roller 4... An assembly groove 7 is provided at one end, and the assembly block 6 is inserted into the assembly groove 7. The assembly groove 7 has slots 17 on both sides, and the locking block 164 is engaged with the slots 17. The roller 2 is placed into the push column, and then the roller 4 passes through the shaft hole 3 through the roller 2 and the push column body 1. Then, the button 165 is pressed, causing the button plate 163 to move the locking block 164. The button plate 163 presses against the second return spring 162, and the second return spring 162 is compressed. The locking block 164 retracts into the receiving cavity 161. Then, the fixing seat 5 is joined with one end of the roller 4, and the assembly block 6 is inserted into the assembly groove 7. The button 165 is released, the second return spring 162 is reset, and the locking block 164 pops out and engages with the slot 17.

[0023] refer to Figures 1 to 2 The roller 2 is mounted on the roller 4, and the roller 2 and the roller 4 have a clearance fit, which ensures that the roller 2 can rotate freely and flexibly on the roller 4.

[0024] Operating principle and advantages: First, place roller 2 into the push column. Then, pass roller 4 through shaft hole 3 through roller 2 and push column body 1. Next, press button 165, causing button plate 163 to move locking block 164. Button plate 163 presses against second return spring 162, compressing second return spring 162. Locking block 164 retracts into receiving cavity 161. Then, fixation seat 5 is joined to one end of roller 4, assembly block 6 is inserted into assembly groove 7, and button 165 is released. Second return spring 162 returns to its original position, and locking block 164 pops out of groove 1. 7. Engage the push block 136, and then push the push block 136. The moving block 133 and the limiting post 134 will move through the connecting block 135. The moving block 133 will press against the first reset spring 132, and the first reset spring 132 will be compressed. The limiting post 134 will retract into the cavity 131. Then, the mounting base 9 will be merged with the mounting surface, and the fixing bolt 11 will be threaded into the threaded hole 10. Release the push block, and the first reset spring 132 will reset. The moving block 133 will push the limiting post 134 out, and the limiting post 134 will be inserted into the annular limiting groove 15 for limiting.

[0025] This invention can effectively prevent bolts from loosening under long-term vibration, limit bolt displacement, and keep the connection between the tappet and the installation part tight and stable. It avoids tappet shaking or displacement due to loose bolts, thereby reducing abnormal friction and collision between the tappet and surrounding components and extending the service life of each component.

Claims

1. A diesel engine tappet, comprising a tappet body (1), characterized in that: The outer side of the tappet body (1) is fixedly fitted with a mounting base (9). A shaft hole (3) is opened on one side of the tappet body (1). A roller (4) is installed inside the shaft hole (3). A fixed base (5) is movably connected to the other end of the roller (4). A fixing component (16) is installed on one side of the fixed base (5). A roller (2) is installed on the outer side of the roller (4). Threaded holes (10) are symmetrically opened on the top of the mounting base (9). A fixing bolt (11) is threaded inside the threaded hole (10). A fixing block (12) is symmetrically fixedly connected on the top of the mounting base (9). A limit component (13) is installed inside the fixing block (12). A tappet rod (8) is fixedly connected to the bottom of the tappet body (1).

2. A diesel engine tappet according to claim 1, characterized in that: The limiting component (13) includes a cavity (131), a first reset spring (132), a moving block (133), a limiting post (134), a connecting block (135), and a push block (136). The fixed block (12) has a cavity (131) inside. The first reset spring (132) is fixedly connected to one side of the cavity (131). The moving block (133) is fixedly connected to the other end of the first reset spring (132). The moving block (133) is slidably connected to the cavity (131). The limiting post (134) is fixedly connected to the other side of the moving block (133). The other end of the limiting post (134) extends out of the side end of the fixed block (12). The connecting block (135) is fixedly connected to the top of the moving block (133). The other end of the connecting block (135) extends out of the top of the fixed block (12) and is fixedly connected to the push block (136).

3. A diesel engine tappet according to claim 2, characterized in that: The top of the fixing block (12) is provided with a sliding groove (14), which is connected to the inside of the cavity (131), and the connecting block (135) is slidably connected to the sliding groove (14).

4. A diesel engine tappet according to claim 3, characterized in that: The outer wall of the fixing bolt (11) is provided with an annular limiting groove (15), and the limiting post (134) is inserted into the annular limiting groove (15).

5. A diesel engine tappet according to claim 1, characterized in that: The fixing assembly (16) includes a receiving cavity (161), a second return spring (162), a pressing plate (163), a locking block (164), and a pressing block (165). The fixing base (5) is fixedly connected to an assembly block (6) on the side near the roller (4). The assembly block (6) has symmetrically opened receiving cavities (161) inside. The second return spring (162) is symmetrically fixedly connected to one side of the receiving cavity (161). The other end of the second return spring (162) is fixedly connected to the pressing plate (163). The pressing plate (163) is slidably connected to the inside of the receiving cavity (161). The pressing plate (163) is fixedly connected to the pressing block (165) and the locking block (164) on the side away from the second return spring (162). The other side of the pressing block (165) extends out of the outside of the assembly block (6), and the other side of the locking block (164) extends out of the outside of the fixing base (5).

6. A diesel engine tappet according to claim 5, characterized in that: The roller (4) has an assembly groove (7) at one end, the assembly block (6) is inserted into the assembly groove (7), and slots (17) are provided on both sides inside the assembly groove (7), and the slot (164) is engaged with the slot (17).

7. A diesel engine tappet according to claim 1, characterized in that: The roller (2) is sleeved on the roller (4), and the roller (2) and the roller (4) have a clearance fit.

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