CN-122014380-A - Cam bearing cover assembly

Abstract

A cam bearing cover assembly belongs to the technical field of automobile engine parts. Comprises an air inlet cam bearing cover and an air outlet cam bearing cover which are matched and arranged in pairs, and the two are of an integrated structure. The air inlet cam bearing cover is integrally provided with an air inlet cam bearing seat, an air inlet bolt hole, an air inlet cross beam and an air inlet longitudinal beam, the first air inlet cam bearing seat is provided with an air inlet rectangular oil groove, the two air inlet cam bearing seats are provided with air inlet positioning sleeve holes, an air inlet cross beam is arranged between adjacent air inlet cam bearing seats, and the cross beam is provided with an air inlet semicircular pit; the exhaust cam bearing cover is of an adaptive structure, two exhaust cross beams are arranged between adjacent exhaust cam bearing seats, and the longitudinal beams and the cross beams respectively form an integral supporting structure. According to the invention, through the cooperative coordination of the integrated structure and each function, a plurality of technical defects of the split bearing cover are overcome, the structural rigidity and the assembly precision are improved, the vibration noise is suppressed, the friction and abrasion are reduced, the NVH performance and the working reliability of the engine are improved, the convenience in production and assembly is realized, and the application and popularization value is high.

Inventors

• YAN LIKAI
• ZHANG TONG
• WANG HONGPENG
• GU CHANGXING
• SU MINGYU
• XIA TE
• HU XIANGYU
• Nan Changhao
• ZHU JIYAN
• LI YANLONG
• ZHANG YING
• YU GUANGDA
• FENG ZHUOYU

Assignees

• 哈尔滨东安汽车动力股份有限公司

Dates

Publication Date

20260512

Application Date

20260326

Claims (6)

1. 1. The cam bearing cover assembly is characterized by comprising an air inlet cam bearing cover (1) and an air outlet cam bearing cover (2), which are matched and arranged in pairs; The air intake cam bearing cover (1) is of an integrated structure, a plurality of air intake cam bearing seats (3), a plurality of air intake bolt holes (4), a plurality of air intake cross beams (6) and two air intake longitudinal beams (5) are integrally formed in the air intake cam bearing cover (1), the first air intake cam bearing seat (3) which is axially arranged along the cam shaft is a bearing seat which is close to the front end of the engine and is provided with an air intake rectangular oil groove (7), the two air intake longitudinal beams (5) are respectively arranged on two sides of the plurality of air intake cam bearing seats (3), the two air intake longitudinal beams (5) and the corresponding side wall of each air intake cam bearing seat (3) are integrally formed, an air intake positioning sleeve hole (9) and an air intake bolt hole (4) are respectively formed in the two air intake cam bearing seats (3), two air intake cross beams (6) are respectively formed in the rest air intake cam bearing seats (3), an air intake cross beam (6) are respectively arranged between every two adjacent air intake cam bearing seats (3), two ends of each air intake cross beam (6) are integrally formed with the corresponding air intake longitudinal beams (5), and each air intake cross beam (6) is provided with a plurality of air intake semicircular structures (6); The exhaust cam bearing cover (2) is of an integrated structure, a plurality of exhaust cam bearing seats (31), a plurality of exhaust bolt holes (41), a plurality of exhaust cross beams (61) and two exhaust longitudinal beams (51) are integrally arranged on the exhaust cam bearing cover (2), the first exhaust cam bearing seat (31) which is axially arranged along the camshaft is a bearing seat which is close to the front end of the engine and is provided with an exhaust rectangular oil groove (71), the two exhaust longitudinal beams (51) are respectively arranged on two sides of the plurality of exhaust cam bearing seats (31), the two exhaust longitudinal beams (51) are integrally formed with corresponding side walls of each exhaust cam bearing seat (31), an exhaust positioning sleeve hole (91) and an exhaust bolt hole (41) are respectively formed in the two exhaust cam bearing seats (31), two exhaust cross beams (61) are respectively formed between every two adjacent exhaust cam bearing seats (31), two ends of each exhaust cross beam (61) are integrally formed with the corresponding exhaust longitudinal beam (51), and two exhaust semicircular pits (81) are respectively formed in each exhaust cross beam (61), and the two exhaust semicircular longitudinal beams (61) are integrally formed with the plurality of support structures.
2. 2. The cam bearing cover assembly according to claim 1, wherein the air inlet rectangular oil groove (7) and the air outlet rectangular oil groove (71) are arranged along the inner wall surface of the corresponding cam bearing seat, and one end of each air inlet rectangular oil groove is communicated with a lubricating oil channel of the cylinder cover (10).
3. 3. The cam bearing cover assembly according to claim 1, wherein the inner diameter of each air inlet positioning sleeve hole (9) and the inner diameter of each air outlet positioning sleeve hole (91) are matched with the outer diameter of a corresponding positioning pin (11) on a cylinder cover (10), and each air inlet positioning sleeve hole (9) and each air outlet positioning sleeve hole (91) are in plug-in fit with the corresponding positioning pin (11).
4. 4. The cam bearing cover assembly according to claim 1, wherein each air inlet longitudinal beam (5) and each air outlet longitudinal beam (51) are of a curve or linear structure, the cross section of each air inlet longitudinal beam is rectangular, and the connecting part of each air inlet longitudinal beam (5) and each air outlet longitudinal beam (51) and the corresponding cam bearing seat is of an integrally formed round corner transition structure.
5. 5. The cam bearing cover assembly according to claim 1, wherein the cross section of each air inlet cross beam (6) and the cross section of each air outlet cross beam (61) are of T-shaped structures or rectangular structures, each air inlet semicircular pit (8) and each air outlet semicircular pit (81) are semicircular grooves, and the semicircular grooves are matched with the structures of protruding parts of the cam shaft.
6. 6. The cam bearing cover assembly according to claim 1, wherein each of the intake bolt holes (4) and each of the exhaust bolt holes (41) are through holes and are adapted to the high-strength bolts (12), and each of the intake bolt holes (4) and each of the exhaust bolt holes (41) is adapted to a corresponding bolt mounting position on the cylinder head (10).

Description

Cam bearing cover assembly Technical Field The invention belongs to the technical field of automobile engine parts, and particularly relates to a cam bearing cover assembly. Background The cam bearing cover is a core fixing part of the camshaft of the internal combustion engine, has the main function of fixing the camshaft, ensures that the camshaft is at a preset correct position, ensures the stable operation of the camshaft, further realizes the accurate opening and closing control of an engine valve, and is a key component of an engine valve mechanism. At present, the technical scheme adopted in the industry is that a cam bearing cover, namely a split cam bearing cover structure, is respectively and independently designed for each shaft diameter part of a cam shaft. The technical defect of the prior art is that as each cam bearing cover is independently arranged and lacks of an integral connection and supporting structure, when the cam shaft runs at a high speed, the cam bearing cover can be subjected to axial and radial short-time nonlinear contact impact transmitted by the cam shaft, and meanwhile, resonance phenomenon is easy to occur with the cam shaft, so that the vibration amplitude is superposed and amplified. The vibration can be directly transmitted to the engine cylinder cover and peripheral parts, and radiation noise between 800Hz and 1000Hz of the engine in the axial direction is caused, and the sound is particularly in the form of clear audible 'pyridazine sound' or 'sandy sound'. The noise can reduce the driving comfort of the whole automobile, does not meet the improvement requirement of the current automobile industry on the NVH performance of the engine, and especially in the field of medium-high-end passenger automobiles, the defect is more prominent, and the noise becomes one of key factors restricting the NVH performance optimization of the engine. Disclosure of Invention In order to solve the problems in the background art, the invention provides a cam bearing cover assembly. The cam bearing cover assembly comprises an air inlet cam bearing cover and an air outlet cam bearing cover which are matched and arranged in pairs; The air inlet cam bearing cover is of an integrated structure, a plurality of air inlet cam bearing seats, a plurality of air inlet bolt holes, a plurality of air inlet cross beams and two air inlet longitudinal beams are integrally arranged on the air inlet cam bearing cover, a first air inlet cam bearing seat which is axially arranged along the cam shaft is a bearing seat close to the front end of the engine and is provided with an air inlet rectangular oil groove, the two air inlet longitudinal beams are respectively arranged on two sides of the plurality of air inlet cam bearing seats, the two air inlet longitudinal beams are integrally formed with corresponding side walls of each air inlet cam bearing seat, an air inlet positioning sleeve hole and an air inlet bolt hole are respectively arranged on the two air inlet cam bearing seats, two air inlet bolt holes are respectively arranged on the other air inlet cam bearing seats, an air inlet cross beam is respectively arranged between every two adjacent air inlet cam bearing seats, two ends of each air inlet cross beam are integrally formed with the corresponding air inlet longitudinal beams, air inlet semicircular pits are respectively arranged on each air inlet cross beam, and the two air inlet longitudinal beams and the air inlet cross beams form an air inlet side integral supporting structure; The exhaust cam bearing cover is of an integrated structure, a plurality of exhaust cam bearing seats, a plurality of exhaust bolt holes, a plurality of exhaust cross beams and two exhaust longitudinal beams are integrally arranged on the exhaust cam bearing cover, the first exhaust cam bearing seat axially arranged along the camshaft is a bearing seat close to the front end of the engine and is provided with an exhaust rectangular oil groove, the two exhaust longitudinal beams are respectively arranged on two sides of the plurality of exhaust cam bearing seats, the two exhaust longitudinal beams and the corresponding side wall of each exhaust cam bearing seat are integrally formed, wherein two exhaust positioning sleeve holes and one exhaust bolt hole are respectively formed in the two exhaust cam bearing seats, two exhaust bolt holes are respectively formed in the other exhaust cam bearing seats, two exhaust cross beams are respectively arranged between every two adjacent exhaust cam bearing seats, two ends of each exhaust cross beam are integrally formed with the corresponding exhaust longitudinal beams, each exhaust cross beam is provided with an exhaust semicircular pit, and the two exhaust longitudinal beams and the plurality of exhaust cross beams form an exhaust side integral support structure. The rectangular air inlet oil groove and the rectangular air outlet oil groove extend along the inner wall surface of th