Camshaft bearing cap assembly split assembly

Abstract

The utility model discloses a camshaft bushing cover assembly split type assembly, including air inlet camshaft, exhaust camshaft, big bushing, small bushing no.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive engine parts, specifically a split assembly of a camshaft bearing cover component. Background Technology

[0002] With the continuous development of technology, the requirements for automotive parts are becoming increasingly stringent. The automotive engine, as the core of a car's power, has a significant impact on its performance and lifespan due to its working principle, type, and maintenance. The automotive engine is the device that provides power to the car; it is the heart of the vehicle, determining its power, economy, stability, and environmental performance.

[0003] The engine bearing cap is a crucial component in a car engine, ensuring the safe operation of critical internal parts such as connecting rods and crankshafts. The main functions of the engine bearing cap include:

[0004] 1. Internal component protection: The engine cover can effectively prevent direct contact between internal metal parts, thereby reducing wear and extending the overall service life of the engine.

[0005] 2. Lubricating oil guidance: The bearing cap is designed with special oil passages that guide the flow of lubricating oil to various key parts of the engine, ensuring that each component receives sufficient lubrication.

[0006] 3. Heat dissipation: The bearing cap also has the ability to help dissipate the heat generated during engine operation, which can effectively reduce the engine's operating temperature.

[0007] 4. Component fixing: The bearing cap is responsible for fixing the engine's core components such as the camshaft, thereby ensuring the engine's stability during operation.

[0008] Therefore, the structure of the bearing cover directly affects the convenience of later installation. Currently, bearing covers are generally die-cast as a whole, which leads to complex processing and high manufacturing costs. Moreover, when the camshaft is installed on the bearing cover, special pressing equipment is required for pressing (the smooth camshaft is first installed on the bearing cover, and then the eccentric wheel on the camshaft is installed on the camshaft one stage at a time). This makes installation and maintenance inconvenient, so improvements are needed. Utility Model Content

[0009] The purpose of this utility model is to provide a split assembly of camshaft bearing cover to solve the problems mentioned in the background art, which are that the existing bearing covers are made by integral die casting, resulting in complicated processing, high manufacturing costs, and the need for professional pressing equipment to press the camshaft onto the bearing cover, which makes installation and maintenance inconvenient.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a split assembly of a camshaft bearing cover, including an intake camshaft, an exhaust camshaft, and a main bearing cover. The main bearing cover has two sets of small bearing cover assemblies for respectively fixing the intake camshaft and the exhaust camshaft. Each set of small bearing cover assemblies includes one or more small bearing covers. Each small bearing cover is positioned with its two end faces against the inner surface of the main bearing cover and is locked onto the main bearing cover using internal Torx bolts. After the cover is installed, a camshaft hole is precision-bored. Two connecting through holes are provided on one side of the main bearing cover. The intake camshaft and exhaust camshaft... One end of the shaft passes through the corresponding connecting through hole. On the other side of the main bearing cover, there is a small bearing cover that simultaneously positions the intake camshaft and the exhaust camshaft. The small bearing cover is positioned with its two end faces against the inner surface of the main bearing cover, and is locked and fixed to the main bearing cover by two inner Torx bolts. After the cover is closed, the camshaft positioning hole is precision bored. A ball bearing is provided inside the small bearing cover that fits around the corresponding intake camshaft and exhaust camshaft. There is a gap between the camshaft positioning hole and the corresponding intake camshaft and exhaust camshaft. The gap serves as a lubricating oil injection port for injecting lubricating oil into the ball bearing.

[0011] Preferably, the main bearing cover is provided with two sets of positioning grooves for fixing the intake camshaft and the exhaust camshaft respectively. The positioning grooves are integrally formed with the main bearing cover. Each set of positioning grooves includes one or more U-shaped lower grooves that are spaced apart. Each small bearing cover has a "∩"-shaped upper groove that mates with the corresponding U-shaped lower groove. The corresponding "∩"-shaped upper groove and the U-shaped lower groove mate to form the camshaft hole.

[0012] Preferably, for ease of positioning, a lower U-shaped groove integrally formed with the main bearing cover is provided on the other side of each group of positioning grooves. The main bearing cover is connected to the secondary bearing cover by one or more internal plum-shaped bolts. The bottom of the secondary bearing cover is provided with two "∩"-shaped upper pressure grooves aligned with the corresponding lower U-shaped grooves. Each lower U-shaped groove and "∩"-shaped upper pressure groove cooperate to form the camshaft positioning hole. The other end of the intake camshaft and exhaust camshaft passes through the corresponding camshaft positioning hole. A bearing retaining groove is provided in the camshaft positioning hole, and the ball bearing is provided in the bearing retaining groove.

[0013] Preferably, in order to limit the axial movement of the ball bearing, a retaining ring groove is provided in each camshaft positioning hole, and a retaining ring located on the outside of the ball bearing is provided in each retaining ring groove. The retaining ring is used to limit the axial movement of the ball bearing.

[0014] As a preferred option to improve stability, each small tile cover in one of the positioning groove groups is provided with a first mounting through hole on one side, and each small tile cover in the other of the positioning groove group is provided with a boss. The boss is provided with a second mounting through hole, and an inner plum bolt passes through the corresponding first or second mounting through hole and is threaded to a screw hole on the large tile cover.

[0015] Preferably, a handle groove is provided on the top of the small tile cover to facilitate later operation.

[0016] Compared with existing technologies, this structure adopts a modular split structure and an improved lubrication system. While ensuring the engine's operating requirements, it achieves a dual breakthrough in reducing manufacturing costs and improving maintenance convenience. It is particularly suitable for the reliability requirements of diesel engines under high load conditions. Moreover, this structure is simpler to process, has lower manufacturing costs, is easier to assemble, and is also easier to disassemble and maintain later. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the split assembly of the camshaft bearing cover in Embodiment 1.

[0018] Figure 2 This is a top view of the split assembly of the camshaft bearing cover in Embodiment 1;

[0019] Figure 3 for Figure 2 A cross-sectional view of AA;

[0020] Figure 4 A schematic diagram of the camshaft bearing cap assembly without the bearing cap installed;

[0021] Figure 5 This is a schematic diagram of the camshaft bearing cap assembly in a split assembly when two of the smaller bearing caps are separated from other components.

[0022] Figure 6 This is a schematic diagram of the structure of the large tile cover;

[0023] Figure 7 This is a structural diagram of one of the positioning plates.

[0024] In the diagram: 1. Intake camshaft; 2. Exhaust camshaft; 3. Main bearing cap; 4. U-shaped lower groove; 5. Inner Torx bolt; 6. Small bearing cap; 7. "∩" shaped upper groove; 8. Connecting through hole; 9. Lower U-shaped groove; 10. Inner Torx bolt; 11. Small bearing cap; 12. "∩" shaped upper pressure groove; 13. Camshaft positioning hole; 14. Bearing retaining groove; 15. Ball bearing; 16. Snap ring groove; 17. Snap ring; 18. First mounting through hole; 19. Boss; 20. Second mounting through hole; 21. Screw hole; 22. Handle groove; 23. Lubricating oil inlet. Detailed Implementation

[0025] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Example 1

[0028] Please see Figures 1-7 As shown in this embodiment, a split-type camshaft bearing cap assembly includes an intake camshaft 1, an exhaust camshaft 2, and a main bearing cap 3. The main bearing cap 3 has two sets of secondary bearing caps for fixing the intake camshaft 1 and the exhaust camshaft 2 respectively. Each set of secondary bearing caps includes one or more secondary bearing caps 6. Each secondary bearing cap 6 is positioned with its two end faces against the inner surface of the main bearing cap and is locked onto the main bearing cap using internal Torx bolts 5. After the bearing cap is closed, camshaft holes are precision-bored. Two connecting through holes 8 are provided on one side of the main bearing cap 3, through which one end of the intake camshaft 1 and the exhaust camshaft 2 passes. A secondary bearing cap 11, which simultaneously positions the intake camshaft 1 and the exhaust camshaft 2, is provided on the other side of the main bearing cap 3. The secondary bearing cap 11 is positioned with its two end faces against the inner surface of the main bearing cap. The small bearing cover 11 is locked and fixed to the large bearing cover 3 by the inner Torx bolt 2 10. After the cover is closed, the camshaft positioning hole 13 is precision bored. The small bearing cover 2 11 is provided with a ball bearing 15 that fits on the corresponding intake camshaft 1 and exhaust camshaft 2. There is a gap between the camshaft positioning hole 13 and the corresponding intake camshaft 1 and exhaust camshaft 2. The gap serves as a lubricating oil injection port 23 for injecting lubricating oil into the ball bearing 15. In this embodiment, by setting a gap on the side of the camshaft positioning hole 13 as a lubricating oil injection port 23, oil can be directly injected into the ball bearing 15 from the lubricating oil injection port 23 in the later stage, avoiding the operation of drilling a slanted hole on the small bearing cover 2 11. Instead, a bearing and snap ring structure design is used, which further extends the service life of the large bearing cover, small bearing cover 2 11 and camshaft, and further facilitates processing and subsequent oiling operations.

[0029] Preferably, the main bearing cover 3 is provided with two sets of positioning grooves for fixing the intake camshaft 1 and the exhaust camshaft 2 respectively. The positioning grooves are integrally formed with the main bearing cover 3. Each set of positioning grooves includes one or more U-shaped lower grooves 4 that are spaced apart. Each small bearing cover 6 has a "∩"-shaped upper groove 7 that mates with the corresponding U-shaped lower groove 4. The corresponding "∩"-shaped upper groove 7 and the U-shaped lower groove 4 mate to form the camshaft hole.

[0030] Preferably, for ease of positioning, a lower U-shaped groove 9 integrally formed with the main bearing cover 3 is provided on the other side of each group of positioning grooves. The main bearing cover 3 is connected to the lower bearing cover 11 by one or more internal plum-shaped bolts 10. The bottom of the lower bearing cover 11 is provided with two "∩"-shaped upper pressure grooves 12 aligned with the corresponding lower U-shaped grooves 9. Each lower U-shaped groove 9 and "∩"-shaped upper pressure groove 12 cooperate to form the camshaft positioning hole 13. The other end of the intake camshaft 1 and the exhaust camshaft 2 passes through the corresponding camshaft positioning hole 13. A bearing retaining groove 14 is provided in the camshaft positioning hole 13, and the ball bearing 15 is provided in the bearing retaining groove 14.

[0031] Preferably, in order to limit the axial movement of the ball bearing, a retaining ring groove 16 is provided in each camshaft positioning hole 13, and a retaining ring 17 located outside the ball bearing 15 is provided in each retaining ring groove 16. The retaining ring 17 is used to limit the axial movement of the ball bearing 15. In this embodiment, by adding the retaining ring 17 and cooperating with the limiting of the bearing retaining groove 14, the ball bearing 15 is ultimately limited in the bearing retaining groove 14, thus avoiding the axial displacement of the ball bearing 15 during rotation and affecting stability.

[0032] As a preferred option to improve stability, each of the small tile covers 6 in one set of positioning grooves is provided with a first mounting through hole 18 on one side, and each of the small tile covers 6 in the same set of positioning grooves is provided with a boss 19 on the other side. The boss 19 is provided with a second mounting through hole 20. The inner plum bolt 5 passes through the corresponding first mounting through hole 18 or second mounting through hole 20 and is threaded to the screw hole 21 on the large tile cover 3.

[0033] As a preferred option, to facilitate later operation, a handle groove 22 is provided on the top of the small tile cover 6.

[0034] This structure first integrally molds the large bearing cover 3, which has two sets of positioning grooves. Each set of positioning grooves includes several U-shaped lower grooves 4, and each U-shaped lower groove 4 is threaded to a small bearing cover 6 by an inner Torx bolt 5. The "∩" shaped upper groove 7 below the small bearing cover 6 and the slot of the U-shaped lower groove 4 cooperate to form a corresponding camshaft hole for limiting. Finally, one set of positioning grooves and several small bearing covers 6 are used to fix the intake camshaft 1, and the other set of positioning grooves and several small bearing covers 6 are used to fix the exhaust camshaft 2. During assembly, the eccentric wheels of each stage can be assembled directly on the camshaft first, and the corresponding camshaft can be quickly assembled into the positioning groove set. Then, the small bearing covers 6 are locked into the U-shaped lower grooves 4 by the inner Torx bolts 5 to achieve quick installation.

[0035] Therefore, this structure adopts a modular split structure and an improved lubrication system. The first and second small bearing covers are positioned on the inner side of the main bearing cover by their two end faces, and then the corresponding small bearing covers are locked onto the main bearing cover with internal Phillips bolts. After the covers are closed, the camshaft hole is precision bored. At the same time, the design of the inclined hole through the camshaft hole for lubrication on the second small bearing cover is cancelled and replaced with a bearing and snap ring structure design, which further ensures the extended service life of the main bearing cover, the second small bearing cover, and the camshaft. Under the premise of ensuring the engine operating conditions, it achieves a dual breakthrough of reduced manufacturing costs and convenient maintenance, which is particularly suitable for the reliability requirements of diesel engines under high load conditions.

[0036] Furthermore, compared to existing tile covers that use one-piece die casting to form the corresponding shaft hole and then require professional pressing equipment to press the camshaft in the later stages, this structure is simpler to process, has lower manufacturing costs, is more convenient to assemble, and is also easier to disassemble and maintain in the later stages.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split assembly of a camshaft bearing cap, comprising an intake camshaft (1), an exhaust camshaft (2), and a bearing cap (3), characterized in that: The main bearing cover (3) is provided with two sets of small bearing cover sets for fixing the intake camshaft (1) and exhaust camshaft (2) respectively. Each set of small bearing cover sets includes one or more small bearing cover 1 (6). Each small bearing cover 1 (6) is positioned with its two end faces against the inner surface of the main bearing cover, and is locked and fixed to the main bearing cover by the inner Torx bolt 1 (5). After the cover is closed, the camshaft hole is precision bored. Two connecting through holes (8) are provided on one side of the main bearing cover (3). One end of the intake camshaft (1) and exhaust camshaft (2) passes through the corresponding connecting through holes (8). The other side of the main bearing cover (3) is provided with a hole that simultaneously positions the intake camshaft (1) and exhaust camshaft (2). The small bearing cover (11) of the exhaust camshaft (2) is positioned on the inner side of the large bearing cover by its two end faces, and is locked and fixed on the large bearing cover (3) by the inner plum bolt (10). After the cover is closed, the camshaft positioning hole (13) is precision bored. The small bearing cover (11) is provided with a ball bearing (15) that is sleeved on the corresponding intake camshaft (1) and exhaust camshaft (2). There is a gap between the camshaft positioning hole (13) and the corresponding intake camshaft (1) and exhaust camshaft (2). The gap is used as a lubricating oil injection port (23) for injecting lubricating oil into the ball bearing (15).

2. The camshaft bearing cap assembly split assembly according to claim 1, characterized in that: The main bearing cover (3) is provided with two sets of positioning grooves for fixing the intake camshaft (1) and the exhaust camshaft (2) respectively. The positioning grooves are integrally formed with the main bearing cover (3). Each set of positioning grooves includes one or more U-shaped lower grooves (4) that are spaced apart. Each small bearing cover (6) is provided with a "∩" shaped upper groove (7) that cooperates with the corresponding U-shaped lower groove (4). The corresponding "∩" shaped upper groove (7) and the U-shaped lower groove (4) cooperate to form the camshaft hole.

3. The camshaft bearing cover assembly split assembly according to claim 2, characterized in that: On the other side of each set of positioning grooves, there is a lower U-shaped groove (9) integrally formed with the large bearing cover (3). The small bearing cover (11) is threadedly connected to the large bearing cover (3) by one or more of the inner plum blossom bolts (10). The bottom of the small bearing cover (11) is provided with two "∩" shaped upper pressure grooves (12) aligned with the corresponding lower U-shaped grooves (9). Each lower U-shaped groove (9) and "∩" shaped upper pressure groove (12) cooperate to form the camshaft positioning hole (13). The other end of the intake camshaft (1) and exhaust camshaft (2) passes through the corresponding camshaft positioning hole (13). A bearing positioning groove (14) is provided in the camshaft positioning hole (13). The ball bearing (15) is provided in the bearing positioning groove (14).

4. The camshaft bearing cover assembly split assembly according to claim 3, characterized in that: A retaining ring groove (16) is provided in each camshaft positioning hole (13), and a retaining ring (17) located outside the ball bearing (15) is provided in each retaining ring groove (16). The retaining ring (17) is used to limit the axial movement of the ball bearing (15).

5. The camshaft bearing cover assembly split assembly according to claim 2 or 3, characterized in that: One side of each small tile cover (6) on one of the positioning groove groups is provided with a first mounting through hole (18), and the other side of each small tile cover (6) on the positioning groove group is provided with a boss (19). The boss (19) is provided with a second mounting through hole (20). The inner plum bolt (5) passes through the corresponding first mounting through hole (18) or second mounting through hole (20) and is threaded to the screw hole (21) on the large tile cover (3).

6. The camshaft bearing cap assembly split assembly according to claim 4, characterized in that: A handle groove (22) is provided on the top of the small tile cover (6).

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