Camshaft seat, double-overhead-cam engine and vehicle

Abstract

The invention belongs to the technical field of engines, and discloses a camshaft seat, a double-overhead-cam engine and a vehicle. An installation area is defined in the main shell, a lap joint beam is arranged in the installation area, the lap joint beam is sunken to form an air inlet cam groove and an exhaust cam groove, an air inlet cam shaft is in lap joint in the air inlet cam groove, an exhaust cam shaft is in lap joint in the exhaust cam groove, the air inlet cam shaft is parallel to the exhaust cam shaft, and the two sides of the lap joint beam are connected with the main shell. A first mounting hole is formed in the main shell, a rotating speed sensor is mounted in the first mounting hole, a second mounting hole is formed in the outer side of the main shell, a wire harness assembly penetrates through the second mounting hole, and the wire harness assembly comprises an oil sprayer wire harness; the problem that in the prior art, a camshaft seat is single in function, and consequently the integration degree of an engine is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a camshaft housing, a double overhead camshaft engine and a vehicle. Background Art

[0002] Currently, the passenger car market in China is still dominated by single overhead camshaft (SOHC) engines. With a relatively simple mechanical layout and low manufacturing cost, this structure has occupied the mainstream position in the past two decades. According to the statistical data of the China Internal Combustion Engine Industry Association in 2023, the engines with SOHC structure account for about 78% of the domestic passenger cars on sale. Its valve drive system controls the intake and exhaust valves simultaneously through a single camshaft, and the rocker arm mechanism is used to realize the opening and closing of the valves. However, with the gradual clarification of the draft of GB18352.7-2025 (National VII Emission Standard), more stringent requirements are put forward for diesel engine thermal efficiency, emission control and NVH performance. The traditional valve train has difficulty meeting the technical requirements of the new generation of power systems. From the perspective of industrialization, although the initial cost of the integrated DOHC system increases by about 15%, the production line working hours can be shortened by 25% through modular assembly, and the full life cycle maintenance cost can be reduced by 30%. More importantly, this technical route reserves interface space for subsequent intelligent control, can be compatible with next-generation technologies such as electric variable valve lift (eVVL), and has significant strategic development value.

[0003] To cope with the upcoming National VII standard, the adoption of the double overhead camshaft (DOHC) valve train solution has become an industry consensus. Compared with the SOHC structure, DOHC can achieve more precise valve timing adjustment by independently controlling the intake and exhaust camshafts. Especially for diesel engines, this structure can effectively support the Late Intake Valve Closing (LIVC) strategy and the Enhanced Exhaust Valve Opening (EEVO) technology, and improve the thermal efficiency to more than 45% through the variable valve timing system, while reducing the particulate matter emissions by 30%. However, it should be noted that the introduction of the DOHC system significantly increases the complexity of the valve train. According to the test data of a certain vehicle manufacturer, the number of components increases by about 40% compared with the SOHC system, which poses new challenges to the engine layout and function integration.

[0004] In the traditional DOHC system, the camshaft housing, as a key support component, has significant design defects. The current mainstream design adopts a split structure, and its function is limited to the radial support of the camshaft. The function of the camshaft housing is relatively single and can only bear the fixing work, resulting in the need to additionally set a support seat for fixing the rocker shaft. Through the disassembly and analysis of ordinary diesel engines nowadays, up to 6 independent installation points need to be arranged on the cylinder head to fix the rocker shaft, occupying an effective space of 12.7 cm 3Meanwhile, the wiring harness for the fuel injector needs to be redesigned for external wall fixation. The camshaft speed sensor is usually independently installed on the cylinder head, which not only increases the harness length by 15%-20%, but also makes the distribution of engine parts more scattered. This discrete layout reduces the compactness index (CCI) of the whole engine to 0.68, far lower than the industry-expected benchmark value of 0.85.

[0005] The lubrication requirements brought about by the DOHC structure increase geometrically. Experimental data shows that the number of friction pairs in the dual-camshaft system increases by 65% compared to the SOHC, and the lubrication requirements of the cam-tappet pair are particularly prominent. There are obvious deficiencies in the oil passage design of the existing pressure lubrication system: the oil pressure drop in the oil passage from the main oil passage to the camshaft bearing seat reaches 0.25 MPa, resulting in insufficient oil pressure at the distal lubrication points; at the same time, the coverage efficiency of the traditional splash lubrication method for the high-position cam is only 43%, resulting in a lubricating film thickness of less than 1 μm at the cam nose (lower than the safety threshold of 3 μm). Some endurance test data shows that under continuous high-load conditions, the probability of abnormal wear of the camshaft increases to 2.3 times that of the SOHC structure. Summary of the Invention

[0006] The purpose of the present invention is to provide a camshaft housing, a double overhead camshaft engine, and a vehicle, so as to solve the problem that the camshaft housing has a single function in the prior art, resulting in a low integration degree of the engine.

[0007] To achieve this purpose, the present invention adopts the following technical solutions: The present invention provides a camshaft housing, including a main housing. An installation area is formed inside the main housing. A lapping beam is arranged in the installation area. The lapping beam is recessed to form an intake cam groove and an exhaust cam groove. The intake camshaft is lapped in the intake cam groove, and the exhaust camshaft is lapped in the exhaust cam groove. The intake camshaft and the exhaust camshaft are parallel. Set the axis of the intake camshaft as the X-axis, the height direction of the camshaft housing as the Z-axis, and the length direction of the lapping beam as the Y-axis. Both sides of the lapping beam are connected to the main housing. Along the X-axis direction, a first installation hole is opened on the main housing, and a speed sensor is installed in the first installation hole. Along the Z-axis direction, a second installation hole is opened on the outer side of the main housing, and a wiring harness assembly is passed through the second installation hole. The wiring harness assembly includes a fuel injector wiring harness.

[0008] Preferably, the main housing is rectangular, and seven groups of lapping beams are integrally formed in the installation area on the inner side of the main housing, and the lapping beams are parallel to each other.

[0009] Preferably, an oil inlet hole and an oil drain hole are opened on one side of the lapping beam away from the intake cam groove. The oil inlet hole and the oil drain hole are connected through a lubrication pipeline. The oil inlet hole and the oil drain hole are respectively connected to the cylinder head. Lubrication holes are opened in both the exhaust cam groove and the intake cam groove, and the lubrication holes are connected to the lubrication pipeline.

[0010] Preferably, a first positioning groove is formed in the overlapping beam, a positioning ring is placed in the first positioning groove, a cam upper cover is installed on the upper side of the overlapping beam, a second positioning groove is formed at the bottom of the cam upper cover, the positioning ring is inserted into the second positioning groove, a first screw hole is formed at the bottom of the first positioning groove, the second positioning groove communicates with a second screw hole, and a first bolt is screwed into the second screw hole and the first screw hole.

[0011] Preferably, an intake rocker arm support and an exhaust rocker arm support are installed on the upper side of the cam upper cover, and the first bolts are respectively screwed into the intake rocker arm support and the exhaust rocker arm support.

[0012] Preferably, a first arc groove and a second arc groove are formed in the lower side groove of the cam upper cover, the first arc groove is pressed against the upper side of the intake camshaft, the second arc groove is pressed against the upper side of the exhaust camshaft, a first communication pipe is formed on the upper side of the first arc groove, a second communication pipe is formed on the upper side of the second arc groove, a third communication pipe is formed in the inner wall of the intake rocker arm support, a fourth communication pipe is formed in the inner wall of the exhaust rocker arm support, the first communication pipe communicates with the third communication pipe, and the second communication pipe communicates with the fourth communication pipe.

[0013] Preferably, an oil injection pipe is formed on the side surface of the main housing, and the oil injection pipe communicates with an injector transverse cavity connecting pipe.

[0014] A double overhead camshaft engine includes the above-mentioned camshaft seat and further includes a cylinder head. The cylinder head is installed on the lower side of the camshaft seat. A sealing groove is formed by circumferentially recessing the main housing, and a sealing ring is installed in the sealing groove. The sealing ring abuts against the cylinder head.

[0015] Preferably, a second bolt is screwed on the intake rocker arm support and the exhaust rocker arm support, and the second bolt passes through the cam upper cover, the overlapping beam and the cylinder head.

[0016] A vehicle includes the above-mentioned double overhead camshaft engine, and the double overhead camshaft engine can provide power for the vehicle.

[0017] Beneficial effects: By providing a camshaft seat with a first mounting hole and a second mounting hole formed therein, the first mounting hole can integrate the fuel injector harness on a double overhead camshaft engine, enabling the fuel injector harness to be threaded and integrated within the first mounting hole. Since the first mounting hole is in close proximity to the camshaft seat, the fuel injector harness can be distributed more closely, enhancing the integration level of the double overhead camshaft engine. Meanwhile, a second mounting hole is provided on one side of the main housing, and a speed sensor is installed within the second mounting hole, positioning the speed sensor closer to the exhaust camshaft and the intake camshaft, resulting in more accurate sensor readings, reducing the overall height of the double overhead camshaft engine, making its structure more compact, and endowing the camshaft seat with more capabilities. Brief Description of the Drawings

[0018] Figure 1 is the assembly drawing of the camshaft seat of the present invention;

[0019] Figure 2 is the cross-sectional view of the camshaft seat of the present invention;

[0020] Figure 3 is the main drawing of the overlapping beam body of the present invention;

[0021] Figure 4 is the main drawing of the side of the sealing groove of the camshaft seat of the present invention.

[0022] In the drawings: 1. Main housing; 11. Installation area; 12. Overlapping beam; 121. Intake cam groove; 122. Exhaust cam groove; 13. First mounting hole; 14. Second mounting hole; 15. Oil inlet hole; 16. Oil drain hole; 17. Lubrication hole; 18. Fuel injection pipe; 19. Sealing groove; 110. Process hole; 2. Positioning ring; 3. Intake rocker arm support; 31. Third communication pipe; 4. Exhaust rocker arm support; 41. Fourth communication pipe; 5. Cam upper cover; 51. First arc groove; 52. Second arc groove; 53. First communication pipe; 54. Second communication pipe; 6. First bolt; 7. Second bolt; 8. Cylinder head. Detailed Description of the Invention

[0023] The present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings rather than all structures.

[0024] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] Under the prior art, since the sensors on the double overhead camshaft engine are installed on the cylinder head, this will extend the length of the wiring harness, and at the same time increase the dispersion degree of the distribution of engine parts. At the same time, an installation area needs to be reserved separately for the sensors on the cylinder head. In addition, the wiring harnesses of the fuel injectors are scattered around the engine, resulting in an insufficiently compact structure of the engine. And the camshaft seats on the existing double overhead camshaft engines are only used to fix the intake camshaft and the exhaust camshaft, resulting in a single function and low utilization rate of the camshaft seats, leading to a relatively discrete distribution of each component on the double overhead camshaft engine, increasing the assembly difficulty and having a low integration degree, and the space occupied by the double overhead camshaft engine is relatively high.

[0028] To solve the above problems, as Figures 1 to 4As shown in the figure, the present invention provides a camshaft housing, which includes a main housing 1. An installation area 11 is formed inside the main housing 1. A lapping beam 12 is arranged in the installation area 11. An intake cam groove 121 and an exhaust cam groove 122 are formed by the depression of the lapping beam 12. The intake camshaft is lapped in the intake cam groove 121, and the exhaust camshaft is lapped in the exhaust cam groove 122. The intake camshaft and the exhaust camshaft are parallel. The axis of the intake camshaft is set as the X-axis, the height direction of the camshaft housing is the Z-axis, and the length direction of the lapping beam 12 is the Y-axis. Both sides of the lapping beam 12 are connected to the main housing 1. Along the X-axis direction, a first installation hole 13 is opened on the main housing 1, and a rotational speed sensor is installed in the first installation hole 13. Along the Z-axis direction, a second installation hole 14 is opened on the outside of the main housing 1, and a wire harness assembly is passed through the second installation hole 14. The wire harness assembly includes an injector wire harness.

[0029] The camshaft housing of the present invention is integrally formed. In the X-axis direction, a first installation hole 13 is provided. The first installation hole 13 is on the side of the main housing. The axis of the first installation hole 13 coincides with the X-axis. The position of the first installation hole 13 is close to the intake camshaft or the exhaust camshaft. In this way, the rotational speed sensor can be closer to the detected target and the detection result is more accurate. Adding a position for installing the rotational speed sensor on the camshaft housing can enable the camshaft housing to have more functions. Since the camshaft housing is installed in the middle position of the double overhead cam engine, by adding a rotational speed sensor on it, the distribution of engine parts can be made more compact, and the space utilization ability of the double overhead cam engine can be higher.

[0030] Similarly, a second installation hole 14 is also opened on the camshaft housing. A wire harness can be passed through the second installation hole 14. Since there will be multiple wire harnesses with different functions arranged around the double overhead cam engine, including the injector wire harness, the wire harness of the injector can be fixed. Similarly, the second installation holes 14 at different positions can be installed on the periphery of the camshaft housing, and the wire harnesses around the double overhead cam engine can be passed through the second installation holes 14, so as to make the components of the double overhead cam engine more compact.

[0031] The main housing 1 of the double overhead camshaft engine of the present invention is rectangular. Seven groups of overlapping beams 12 are integrally formed in the installation area 11 inside the main housing 1. The overlapping beams 12 are parallel to each other. Each group of overlapping beams 12 supports the exhaust camshaft and the intake camshaft to fix them. A gap is formed between each overlapping beam 12. A fuel injection pipe 18 is provided between each group of overlapping beams 12, and a fuel injection pipe 18 is provided on the side of the main housing 1. The fuel injection pipe 18 is communicated with the fuel injector transverse cavity connecting pipe. In this way, the camshaft seat can be connected to more parts, and the functions borne by the camshaft seat are becoming more and more abundant. Since the camshaft seat is installed in the middle of the double overhead camshaft engine, the scattered parts on the double overhead camshaft engine will be concentrated in the middle, making the integration degree of the double overhead camshaft engine higher, reducing the volume occupied by the double overhead camshaft engine, and making the space utilization more reasonable.

[0032] An oil inlet hole 15 and an oil drain hole 16 are provided on the side of the overlapping beam 12 away from the intake cam groove 121. The oil inlet hole 15 and the oil drain hole 16 are communicated through a lubrication pipeline. The oil inlet hole 15 and the oil drain hole 16 are respectively communicated with the cylinder head 8. Lubrication holes 17 are provided in both the exhaust cam groove 122 and the intake cam groove 121. The lubrication holes 17 are communicated with the lubrication pipeline. A lubrication pipeline is formed inside the camshaft seat. Lubricating oil flows in the lubrication pipeline, enters from the oil inlet hole 15, and discharges from the oil drain hole 16. Among them, the overlapping positions of the intake camshaft and the exhaust camshaft are lubricated through the lubrication holes 17 to avoid excessive wear of the intake camshaft and the exhaust camshaft. The intake camshaft and the exhaust camshaft of the present invention adopt high-strength cast aluminum materials, and with good lubrication functions, the camshaft bearings of the diesel engine involved in the present invention are cancelled, which not only reduces the cost, but also reduces the number and types of parts.

[0033] A first positioning groove is provided on the overlapping beam 12. A positioning ring 2 is placed in the first positioning groove. A cam upper cover 5 is installed on the upper side of the overlapping beam 12. A second positioning groove is provided at the bottom of the cam upper cover 5. The positioning ring 2 is inserted into the second positioning groove. A first screw hole is provided at the bottom of the first positioning groove. The second positioning groove is communicated with the second screw hole. A first bolt 6 is screwed into the second screw hole and the first screw hole.

[0034] When the cam upper cover 5 is placed on the camshaft seat, the camshaft seat and the cam upper cover 5 can be quickly positioned through the positioning ring 2. The positioning ring 2 can be inserted into both the first positioning groove and the second positioning groove. At the same time, a first bolt 6 is also installed in the positioning ring 2, making the integration degree of the fasteners higher. The positioning and fastening can be integrated together, reducing the opening on the camshaft seat, reducing the processing cost, and improving the efficiency of space utilization. The cam upper cover 5 and the camshaft seat can be fixed through the first bolt 6.

[0035] On the upper side of the cam upper cover 5 of the present invention, an intake rocker arm support 3 and an exhaust rocker arm support 4 are installed, and are fixed by two groups of first bolts 6 at the same time. The first bolts 6 are respectively screwed into the intake rocker arm support 3 and the exhaust rocker arm support 4, and there is also a group of first bolts 6 screwed into the camshaft seat and the cylinder head 8. The specifications of the first bolts 6 are the same, reducing the number of component specifications and the assembly difficulty.

[0036] On the lower side of the cam upper cover 5, grooves form a first arc groove 51 and a second arc groove 52. The first arc groove 51 is pressed against the upper side of the intake camshaft, and the second arc groove 52 is pressed against the upper side of the exhaust camshaft. On the upper side of the first arc groove 51, a first communication pipe 53 is provided, and on the upper side of the second arc groove 52, a second communication pipe 54 is provided. Inside the inner wall of the intake rocker arm support 3, a third communication pipe 31 is provided, and inside the inner wall of the exhaust rocker arm support 4, a fourth communication pipe 41 is provided. The first communication pipe 53 is communicated with the third communication pipe 31. In this way, the lubricating oil on the diameter of the intake camshaft can enter the intake rocker arm support 3 along the first communication pipe 53 and the third communication pipe 31 to achieve lubrication of the intake rocker arm. At the same time, the second communication pipe 54 is communicated with the fourth communication pipe 41, so that the lubricating oil on the diameter of the exhaust camshaft enters the exhaust rocker arm support 4 along the second communication pipe 54 and the fourth communication pipe 41 to achieve lubrication of the exhaust rocker arm. Since the intake rocker arm support 3 and the exhaust rocker arm support 4 are directly installed on the cam upper cover 5, the structure is more compact, and the lubricating oil discharged from the lubricating pipeline can be used for lubrication.

[0037] On the upper side of the double overhead camshaft engine, a camshaft seat is installed. Under the camshaft seat, a cylinder head 8 is installed. Along the circumferential direction of the main housing 1, a sealing groove 19 is formed. A sealing ring is installed in the sealing groove 19, and the sealing ring abuts against the cylinder head 8. The sealing ring in the sealing groove 19 can block external dust from entering.

[0038] On the intake rocker arm support 3 and the exhaust rocker arm support 4 of the double overhead camshaft engine, a second bolt 7 is screwed. The second bolt 7 passes through the cam upper cover 5, the overlapping beam 12 and the cylinder head 8. The length of the second bolt 7 is relatively long, and multiple parts can be fixed. The double overhead camshaft engine can provide power for the vehicle.

[0039] On the X-axis direction of the main housing 1, a process hole 110 is provided to facilitate the boring tool to extend when machining the intake cam groove 121 and the exhaust cam groove 122. The above process hole 110 is sealed by a bowl-shaped plug.

[0040] The present invention also discloses a processing and assembly method for a double overhead camshaft engine:

[0041] Installation process before processing: After the finished camshaft seat has passed the inspection, first use a special tool to seal the process hole 110 on the bowl-shaped plug to ensure that the cylinder head 8 system and the working space of the valve system are completely sealed, and then knock two locating rings 2 into each cam cover 5 in turn. A total of 14 locating rings 2 need to be knocked into the seven-speed cover; then according to the technical conditions for the assembly of the diesel engine, the seven-speed cover is pressed onto the camshaft seat in turn, and the pressing process must be strictly installed in accordance with the technical requirements and anti-error markings; before the exhaust cam groove 122 and the intake cam groove 121 are combined and processed, the intake rocker arm shaft support and the exhaust rocker arm shaft support do not need to be installed on the assembly, so at this time, the assembly installation fixing bolts do not need the longer second bolts 7, only three first bolts 6 are needed for fixing, and the three first bolts 6 pass through the cam cover 5, the camshaft shaft seat, and the cylinder head 8 in turn and are tightened according to the torque requirements; after all seven gears are installed, they can be sent to the processing workshop for combined processing of the intake cam groove 121 and the exhaust cam groove 122.

[0042] (2) Assembly processing: Before the processing workshop carries out assembly processing on the assembly, it is necessary to re-measure the tightening torque of each fastening bolt to see if it meets the technical requirement of 40Nm; then, when the boring tool is used to process the intake cam groove 121 and the exhaust cam groove 122, the runout tolerance of the boring tool must be strictly controlled to ensure the roundness and verticality of the intake cam groove 121 and the exhaust cam groove 122 as well as the first positioning groove and the second positioning groove, so as to ensure the accuracy and reasonable clearance of the subsequent installation of parts such as the camshaft.

[0043] (3) Disassembly process: After the assembly processing is completed, the first bolts 6 of the cam cover 5 of each gear are loosened and removed in turn. Each cam cover 5 is pried with a special tool. After all are loosened, they are removed in turn. At this time, it is necessary to check whether the positioning ring 2 on each gear cover is detached or lost. After confirming that it is correct, the intake camshaft and the exhaust camshaft are placed in the processed intake cam groove 121 and the exhaust cam groove 122 in turn, and then the cam cover 5 is pressed in turn, and the first bolt 6 is tightened and fixed according to the fixed torque. The axial clearance and rotation of the two camshafts are checked again to avoid camshaft jamming caused by parts processing or assembly errors. After confirmation, it can be sent to final assembly.

[0044] (4) Assembly process: After the intake camshaft and the exhaust cam are installed, the seven-speed upper cover is pressed in sequence, and then the second bolt 7 needs to be installed; before the bolt is installed, the intake rocker arm shaft support and the exhaust rocker arm shaft support need to be placed on each gear upper cover in sequence, and a return spring seat needs to be installed at the middle bolt to reset the rocker arm mechanism. The bolts are tightened according to the tightening torque during the assembly process. After the overall installation is completed, the entire cylinder head 8 assembly can be completed according to the assembly technical conditions. After the cylinder head 8 assembly is assembled, it can be sent to other processes for the overall installation and commissioning of the diesel engine.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A camshaft seat, characterized in that: The invention comprises a main housing (1), wherein the main housing (1) is surrounded by a mounting area (11), wherein a lap beam (12) is arranged in the mounting area (11), wherein the lap beam (12) is recessed to form an intake cam groove (121) and an exhaust cam groove (122), wherein an intake cam shaft is overlapped in the intake cam groove (121), and an exhaust cam shaft is overlapped in the exhaust cam groove (122), wherein the intake cam shaft is parallel to the exhaust cam shaft, wherein the axis of the intake cam shaft is set as the X axis, and wherein The height direction of the camshaft seat is the Z axis, the length direction of the lap beam (12) is the Y axis, the two sides of the lap beam (12) are connected to the main housing (1), along the X axis direction, a first mounting hole (13) is opened on the main housing (1), a speed sensor is installed in the first mounting hole (13), and along the Z axis direction, a second mounting hole (14) is opened on the outside of the main housing (1), a wiring harness assembly is passed through the second mounting hole (14), and the wiring harness assembly includes an injector wiring harness.

2. The camshaft seat according to claim 1, characterized in that: The main shell (1) is rectangular, and the installation area (11) inside the main shell (1) is integrally formed with seven groups of lap beams (12), and the lap beams (12) are parallel to each other.

3. The camshaft seat according to claim 1, characterized in that: An oil inlet hole (15) and an oil drain hole (16) are provided on a side of the lap beam (12) away from the intake cam groove (121); the oil inlet hole (15) and the oil drain hole (16) are connected via a lubrication pipeline; the oil inlet hole (15) and the oil drain hole (16) are respectively connected to the cylinder head (8); the exhaust cam groove (122) and the intake cam groove (121) are both provided with a lubrication hole (17); the lubrication hole (17) is connected to the lubrication pipeline.

4. The camshaft seat according to claim 1, characterized in that: The lap beam (12) is provided with a first positioning groove, a positioning ring (2) is placed in the first positioning groove, a cam cover (5) is installed on the upper side of the lap beam (12), a second positioning groove is provided at the bottom of the cam cover (5), the positioning ring (2) is inserted into the second positioning groove, a first screw hole is provided at the bottom of the first positioning groove, the second positioning groove is connected to the second screw hole, and a first bolt (6) is screwed into the second screw hole and the first screw hole.

5. The camshaft seat according to claim 4, characterized in that: An intake rocker arm support (3) and an exhaust rocker arm support (4) are installed on the upper side of the cam upper cover (5), and the first bolt (6) is screwed into the intake rocker arm support (3) and the exhaust rocker arm support (4) respectively.

6. The camshaft seat according to claim 5, characterized in that: The groove on the lower side of the cam cover (5) forms a first arc groove (51) and a second arc groove (52); the first arc groove (51) is pressed against the upper side of the intake camshaft, and the second arc groove (52) is pressed against the upper side of the exhaust camshaft; a first connecting tube (53) is provided on the upper side of the first arc groove (51), and a second connecting tube (54) is provided on the upper side of the second arc groove (52); a third connecting tube (31) is provided on the inner wall of the intake rocker arm support (3), and a fourth connecting tube (41) is provided on the inner wall of the exhaust rocker arm support (4); the first connecting tube (53) is connected to the third connecting tube (31), and the second connecting tube (54) is connected to the fourth connecting tube (41).

7. The camshaft seat according to claim 1, characterized in that: A fuel injection pipe (18) is provided on the side of the main housing (1), and the fuel injection pipe (18) is connected to the fuel injector transverse cavity connecting pipe.

8. A double overhead cam engine, characterized in that: It comprises the camshaft seat as claimed in claim 6, and also comprises a cylinder head (8), wherein the cylinder head (8) is installed on the lower side of the camshaft seat, and a sealing groove (19) is formed along the circumferential recess of the main housing (1), and a sealing ring is installed in the sealing groove (19), and the sealing ring abuts against the cylinder head (8).

9. The double overhead cam engine of claim 8, wherein: The intake rocker arm support (3) and the exhaust rocker arm support (4) are screwed with a second bolt (7), and the second bolt (7) is passed through the cam upper cover (5), the lap beam (12) and the cylinder head (8).

10. A vehicle, characterized in that: Including the double overhead cam engine of claim 8, the double overhead cam engine is capable of providing power to the vehicle.

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