Double-oil-channel rocker shaft structure

Abstract

The utility model discloses a kind of rocker shaft structures of double oil way, including shaft body;The first oil way and the second oil way that are independent of each other are provided in the shaft body along the axial direction;A plurality of through nail holes that pass through its radial direction are provided on the shaft body, the first oil way and the second oil way are respectively arranged in the two sides of the through nail hole and are not communicated with the through nail hole;The end of the shaft body is equipped with oil supply hole, the oil supply hole is communicated with the first oil way by first connecting hole, the oil supply hole is communicated with the second oil way by second connecting hole, and the oil supply hole is used to access external oil supply component;The region of the outer circumferential surface of the shaft body corresponding to the through nail hole and the oil supply hole is equipped with mounting plane, and the mounting plane is used to be positioned with the plane of mounting seat. The rocker shaft of the utility model includes double oil way, and its structure is compact, lubrication is accurate, installation is stable and has strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a rocker arm shaft structure with dual oil passages. Background Technology

[0002] As socio-economic activities place increasing demands on vehicle power, economy, and adaptability, the lightweighting, safety, applicability, and reliability of vehicle components have become key areas of focus for the industry. As the core power source of a vehicle, the engine operates under extremely harsh conditions. In particular, the moving parts of the valve train must withstand high-frequency friction and temperature fluctuations over long periods, placing extremely high demands on the safety and reliability of the lubrication system. Insufficient lubrication and reduced oil pressure can easily lead to serious failures such as bearing failure, directly causing engine shutdown or even scrapping. Traditional engine rocker arm shafts often use a single oil passage structure. This design has inherent flaws: a single oil passage cannot meet the differentiated lubrication needs of the intake and exhaust rocker arms, and the large diameter of the oil passage can easily lead to low oil pressure and uneven flow distribution, directly exacerbating the risk of insufficient lubrication. Furthermore, traditional single oil passages often penetrate or are too close to the mounting bolt holes (through bolt holes) on the shaft, not only reducing the structural strength of the shaft but also allowing external impurities to enter the oil passage through the bolt holes, affecting oil cleanliness and further increasing the probability of bearing failure, severely restricting the engine's operational reliability.

[0003] To address the aforementioned issues, some technologies have attempted to employ a dual-oil-channel design, but these have not yet completely overcome existing bottlenecks. Firstly, existing dual-oil-channel designs are mostly coplanar, requiring increased radial dimensions of the shaft to ensure structural strength, which contradicts the need for a compact engine cylinder head layout. Secondly, the avoidance design between the oil channels and through-holes is unreasonable, still posing risks of cleanliness and oil leakage. Furthermore, single-end oil supply designs have poor adaptability and lack redundancy; blockage of the oil supply channel can still lead to lubrication failure. Additionally, traditional rocker arm shafts rely on the contact area between the cylindrical surface and the mounting base for positioning, resulting in a small contact area and low precision. This can lead to lateral movement or rotation during engine operation, indirectly affecting lubrication. Considering the actual risk of engine bearing failure and the design flaws of existing structures, a dual-oil-channel rocker arm shaft structure that balances stable oil pressure, ensures cleanliness, has a compact structure, and provides stable installation is urgently needed to fundamentally solve the shortcomings of traditional designs.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0005] The purpose of this utility model is to propose a dual-oil-channel rocker arm shaft structure to solve the technical problems of low oil pressure, uneven lubrication distribution, and unreasonable layout of oil channels and through-holes in traditional single-oil-channel rocker arm shafts, which easily leads to impurity intrusion and insufficient cleanliness, thus causing bearing failure. At the same time, it solves the technical problems of poor compactness, low installation and positioning accuracy, and insufficient adaptability and redundancy guarantee of existing dual-oil-channel rocker arm shaft structures.

[0006] Therefore, this utility model proposes a rocker arm shaft structure with dual oil channels.

[0007] Preferably, the present invention may also have the following technical features:

[0008] A rocker arm shaft structure with dual oil passages includes a shaft body; the shaft body has an axially independent first oil passage and a second oil passage; the shaft body has a plurality of radially penetrating through-holes, the first oil passage and the second oil passage are respectively arranged on both sides of the through-holes and are not connected to the through-holes; the end of the shaft body has an oil supply hole, the oil supply hole is connected to the first oil passage through a first connecting hole, the oil supply hole is connected to the second oil passage through a second connecting hole, and the oil supply hole is used to connect to an external oil supply component; the outer circumference of the shaft body has a mounting plane corresponding to the through-holes and the oil supply hole, the mounting plane is used to fit and position with the plane of the mounting base.

[0009] Preferably, the inner diameter of the first oil passage is not equal to the inner diameter of the second oil passage; within the radial section of the shaft, the axis of the first oil passage and the axis of the second oil passage are not on the same horizontal plane; the extension lines of the center lines of the first connecting hole and the second connecting hole intersect the center line of the oil supply hole in the top region of the shaft.

[0010] Preferably, a plurality of sets of through holes are provided on the shaft body, and each set has two through holes arranged side by side along the axis of the shaft body.

[0011] Preferably, a third connecting hole and a fourth connecting hole are respectively provided on the shaft corresponding to the exhaust drive end and the exhaust actuator end, and the third connecting hole and the fourth connecting hole are respectively connected to the first oil passage and the second oil passage; a fifth connecting hole and a sixth connecting hole are respectively provided on the shaft corresponding to the intake drive end and the intake actuator end, and the fifth connecting hole and the sixth connecting hole are respectively connected to the first oil passage and the second oil passage.

[0012] Preferably, the oil supply hole and the through-pin hole are arranged collinearly along the axial direction of the shaft.

[0013] Preferably, the radial openings of the oil supply hole and the through-pin hole are aligned.

[0014] Preferably, the oil supply hole is a stepped hole, and different diameter sections of the stepped hole are used for fitting and sealing with external oil supply components.

[0015] Preferably, a sealing ring is provided between the external oil supply component and the oil supply hole, and the sealing ring is used to seal the connection between the oil supply hole and the external oil supply component.

[0016] Preferably, the central axis of the oil supply hole is perpendicular to the mounting plane.

[0017] Preferably, the mounting plane is a plane formed by milling the outer peripheral surface of the shaft, and the extending direction of the mounting plane is parallel to the axial direction of the shaft.

[0018] The beneficial effects of this utility model compared with the prior art include:

[0019] 1. The rocker arm shaft of this utility model adopts a dual oil passage structure, which can distribute oil according to the different load requirements of the intake and exhaust rocker arms, and solve the contradiction that a single oil passage cannot simultaneously meet the requirements of "light load oil saving" and "heavy load sufficient lubrication".

[0020] 2. The layout of the through hole and oil passage of the rocker arm shaft of this utility model avoids oil leakage caused by the connection between the oil passage and the through hole, while maintaining the material thickness of the key area of ​​the shaft body, so that the rigidity of the shaft body is not reduced due to the opening of the oil passage, and at the same time, it eliminates the risk of blockage caused by impurities entering the oil passage through the through hole.

[0021] 3. The mounting plane of the rocker arm shaft of this utility model is in contact with the surface of the mounting base for positioning. Compared with the traditional cylindrical surface fitting positioning, the contact area is large and the positioning accuracy is high. This effectively suppresses the axial movement and circumferential rotation of the rocker arm shaft and ensures the valve timing accuracy of the engine valve train.

[0022] 4. The oil supply holes at both ends can be adapted to different installation directions without strictly limiting the oil supply end, reducing assembly constraints; the dual-end oil supply can make the oil pressure in the first oil passage and the second oil passage more uniform, and if the oil supply hole at one end is blocked, the other end can still ensure lubrication, improving system reliability; the symmetrical design at both ends facilitates shaft machining and can also be adapted to the oil pipeline layout of different models. Attached Figure Description

[0023] Figure 1 This is a top view of the shaft in a specific embodiment of this utility model.

[0024] Figure 2 This is a front view of the shaft in a specific embodiment of this utility model.

[0025] Figure 3 This is a rear view of the shaft in a specific embodiment of this utility model.

[0026] Figure 4This is a bottom view of the shaft of a specific embodiment of this utility model.

[0027] Figure 5 This is a left view of the shaft of a specific embodiment of this utility model.

[0028] Figure 6 This utility model is based on Figure 5 A sectional view cut at point EE.

[0029] Figure 7 This utility model is based on Figure 2 A sectional view taken at point BB.

[0030] Figure 8 This utility model is based on Figure 2 A sectional view cut at point CC.

[0031] Figure 9 This utility model is based on Figure 2 A sectional view cut at point DD.

[0032] Figure 10 This is an assembly drawing of the shaft and rocker arm according to a specific embodiment of this utility model.

[0033] Figure 11 This is a radially cut cross-sectional view of the assembly drawing of the shaft and rocker arm according to a specific embodiment of this utility model.

[0034] Explanation of reference numerals in the attached drawings: 1-shaft body; 2-first oil passage; 3-second oil passage; 4-through pin hole; 5-oil supply hole; 6-first connecting hole; 7-second connecting hole; 8-mounting plane; 9-exhaust rocker arm; 91-exhaust drive end; 92-exhaust actuator end; 10-intake rocker arm; 101-intake drive end; 102-intake actuator end; 11-third connecting hole; 12-fourth connecting hole; 13-fifth connecting hole; 14-sixth connecting hole; 15-seventh connecting hole. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0036] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0037] This embodiment discloses a rocker arm shaft structure with dual oil channels, such as... Figures 1-11As shown, it includes a shaft 1, which is a one-piece rigid structure with an overall length adapted to the rocker arm mounting range of the engine cylinder head. The shaft 1 integrates dual independent oil passages, radial through holes 4, end oil supply holes 5, and outer peripheral mounting planes 8, adapting to the precise drive requirements of multiple sets of intake and exhaust rocker arms of the engine.

[0038] Specifically, the shaft body 1 has an independent first oil passage 2 and a second oil passage 3 along its axial direction, with no connection between them. The shaft body 1 has several through holes 4 penetrating its radial direction. The first oil passage 2 and the second oil passage 3 are respectively arranged on both sides of the through holes 4 and are not connected to each other. The end of the shaft body 1 has an oil supply hole 4. The oil supply hole 4 is connected to the first oil passage 2 through a first connecting hole 6 and to the second oil passage 3 through a second connecting hole 7. The oil supply hole 4 is used to connect to an external oil supply component. The outer circumference of the shaft body 1 has a mounting plane 8 corresponding to the through holes 4 and the oil supply hole 5. The mounting plane 8 is used to fit and position with the plane of the mounting base to achieve positioning and fixation.

[0039] The aforementioned rocker arm shaft adopts a dual-oil-passage structure, which can distribute oil according to the different load requirements of the intake and exhaust rocker arms, solving the contradiction that a single oil-passage cannot simultaneously meet the requirements of "oil saving under light load" and "sufficient lubrication under heavy load". The layout of the through-hole 4 and the oil passage avoids oil leakage caused by the connection between the oil passage and the through-hole 4, while maintaining the material thickness of the key area of ​​the shaft body 1, so that the rigidity of the shaft body 1 is not reduced due to the opening of the oil passage, and at the same time, it eliminates the risk of blockage caused by impurities entering the oil passage through the through-hole 4. The surface contact positioning between the mounting plane 8 and the mounting base has a larger contact area and higher positioning accuracy compared with the traditional cylindrical surface fitting positioning, effectively suppressing the axial movement and circumferential rotation of the rocker arm shaft, and ensuring the valve timing accuracy of the engine valve train.

[0040] With oil supply holes 5 at both ends, it can be adapted to different installation directions without strictly limiting the oil supply end, thus reducing assembly constraints. Dual-end oil supply can make the oil pressure of the first oil passage 2 and the second oil passage 3 more uniform. At the same time, if one end of the oil supply hole 5 is blocked, the other end can still ensure lubrication, improving system reliability. The symmetrical design at both ends facilitates the machining of the shaft 1 (such as more efficient drilling of oil passages and connecting holes) and can also be adapted to the oil pipeline layout of different models.

[0041] Specifically, such as Figure 5 and 7As shown, the inner diameter of the first oil passage 2 is not equal to the inner diameter of the second oil passage 3, and the inner diameter of a single oil passage is less than half the inner diameter of a traditional single-oil-passage rocker arm shaft oil passage. Within the radial section of the shaft 1, the axes of the first oil passage 2 and the second oil passage 3 are not on the same horizontal plane (i.e., they are distributed in upper and lower layers along different radial heights). The extension lines of the centerlines of the first connecting hole 6 and the second connecting hole 7 intersect the centerline of the oil supply hole 5 at the top region of the shaft 1. This upper and lower layered layout of the double oil passages, compared to a planar arrangement, avoids excessive material thinning between the oil passages without increasing the diameter of the shaft 1, resulting in more uniform radial force distribution on the shaft 1. It also provides sufficient space for the subsequent oblique arrangement of the connecting holes, optimizing the internal structural compactness. The intersection design of the oblique connecting holes (first connecting hole 6 and second connecting hole 7) and the oil supply hole 5 also provides a unified benchmark for oblique hole machining, avoiding drilling deviation or misalignment, reducing machining difficulty and scrap rate, and improving production efficiency.

[0042] Specifically, such as Figure 1 As shown, a number of sets of through holes 4 are provided on the shaft 1. Each set has two through holes 4 arranged side by side along the axis of the shaft 1. The grouped layout of the through holes 4 makes the fixing point of the shaft 1 correspond one-to-one with the rocker arm unit. The tightening force of the fixing bolt can be evenly transmitted to each rocker arm installation area, avoiding local deformation of the shaft 1 caused by concentrated force at a single fixing point, and improving the overall installation stability of the rocker arm shaft.

[0043] like Figures 8-11As shown, an exhaust rocker arm 9 and an intake rocker arm 10 form a group. A set of through holes 4 is provided between two adjacent groups of rocker arms. The two ends of the exhaust rocker arm 9 are an exhaust drive end 91 and an exhaust actuation end 92, respectively. A third connecting hole 11 and a fourth connecting hole 12 are provided on the shaft body 1 corresponding to the exhaust drive end 91 and the exhaust actuation end 92, respectively. The third connecting hole 11 and the fourth connecting hole 12 are connected to the first oil passage 2 and the second oil passage 3, respectively. The two ends of the intake rocker arm 10 are an intake drive end 101 and an intake actuation end 102, respectively. A fifth connecting hole 13 and a sixth connecting hole 14 are provided on the shaft body 1 corresponding to the intake drive end 101 and the intake actuation end 102, respectively. The fifth connecting hole 13 and the sixth connecting hole 14 are connected to the first oil passage 2 and the second oil passage 3, respectively. All the aforementioned connecting holes are angled oil holes, precisely aligned with the mating lubrication surfaces of the rocker arm and shaft 1. Oil passages are provided in the rocker arm, and the connecting holes are specifically designed to ensure precise oil delivery to key lubrication points of the rocker arm, reducing wear and extending the service life of the rocker arm and shaft 1. The precise oil supply design for the rocker arm's drive and actuator ends solves the problem of uneven lubrication at both ends of the rocker arm caused by traditional "single-point oil supply," achieving 100% oil coverage on key friction surfaces (cam-drive end, actuator-valve), reducing wear and extending the rocker arm's service life. Each lubrication point is independently supplied with oil, and the oil output can be adjusted according to the wear characteristics of different parts of the rocker arm (e.g., more severe wear at the drive end can be achieved by fine-tuning the connecting hole diameter to increase oil supply), further optimizing lubrication and improving the reliability of the engine's valve train.

[0044] Specifically, such as Figure 1 As shown, the oil supply hole 5 and the through-bolt hole 4 are arranged collinearly along the axial direction of the shaft 1, meaning the center lines of the oil supply hole 5 and the through-bolt hole 4 are on the same straight line. This simplifies the reference positioning during shaft machining, improves machining accuracy, optimizes the internal space layout, avoids structural interference, and facilitates directional calibration during assembly. Specifically, the radial openings of the oil supply hole 5 and the through-bolt hole 4 face the same direction, meaning their openings point in the same direction radially on the shaft 1. This avoids spatial interference between the oil supply connector and the fixing bolt of the through-bolt hole 4, facilitates unified planning of installation space, and improves assembly convenience. Figure 7 As shown, the oil supply hole 5 is a stepped hole, and different diameter sections of the stepped hole are used for mating and sealing with the external oil supply component. In actual use, a sealing ring is provided between the external oil supply component and the oil supply hole 5. The sealing ring is used to seal the connection between the oil supply hole 5 and the external oil supply component, improving the reliability of mating with the external component.

[0045] Specifically, such as Figure 7As shown, the central axis of the oil supply hole 5 is perpendicular to the mounting plane 8. This vertical layout allows the external oil supply components to be assembled along a direction perpendicular to the mounting plane 8. The positioning function of the mounting plane 8 ensures the coaxiality of the connector and the oil supply hole 5, improving assembly accuracy and sealing reliability. Specifically, the mounting plane 8 is a plane formed by milling the outer circumferential surface of the shaft 1. The extension direction of the mounting plane 8 is parallel to the axial direction of the shaft. This high-precision milling ensures a full fit between the rocker arm shaft and the mounting seat, avoiding shaft wobble caused by installation errors, ensuring the rocker arm swing accuracy, and thus improving the operational stability of the engine valve train. Figure 1 and 6 As shown, the shaft body 1 is also provided with a seventh connecting hole 15 that communicates with the second oil passage 3, and the seventh connecting hole 15 communicates with the cylinder head shaft cover oil hole.

[0046] During installation, the mounting plane 8 of the rocker arm shaft is aligned with the mounting surface of the engine cylinder head. Fastening bolts are inserted through the through-bolt holes 4 to fix the shaft 1. The exhaust rocker arm 9 and intake rocker arm 10 are then fitted into the corresponding sections of the shaft 1. The connector of the external oil supply component is inserted into the oil supply hole 5, and the sealing structure is installed. Here's a brief explanation of the lubricating oil flow within the rocker arm shaft: external oil enters through the oil supply hole 5 and is distributed to the first oil passage 2 and the second oil passage 3 via the first connecting hole 6 and the second connecting hole 7, respectively. The oil in the two oil passages flows axially and is precisely sprayed through the third to sixth connecting holes to the mating surfaces of the rocker arm's drive end, actuator end, and shaft, achieving lubrication. The lubricated oil then flows back to the engine oil pan along the gap between the rocker arm and shaft 1, completing the circulation.

[0047] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0048] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A rocker arm shaft structure with dual oil channels, characterized in that: The shaft includes a shaft body; the shaft body has an independent first oil passage and a second oil passage arranged axially inside; the shaft body has a plurality of through holes extending radially through it, the first oil passage and the second oil passage are respectively arranged on both sides of the through holes and are not connected to the through holes; the end of the shaft body has an oil supply hole, the oil supply hole is connected to the first oil passage through a first connecting hole, the oil supply hole is connected to the second oil passage through a second connecting hole, and the oil supply hole is used to connect to an external oil supply component; the outer peripheral surface of the shaft body has a mounting plane corresponding to the through holes and the oil supply hole, the mounting plane is used to fit and position with the plane of the mounting base.

2. The rocker arm shaft structure with dual oil channels according to claim 1, characterized in that: The inner diameter of the first oil passage is not equal to the inner diameter of the second oil passage; within the radial section of the shaft, the axis of the first oil passage and the axis of the second oil passage are not on the same horizontal plane; the extension lines of the center lines of the first connecting hole and the second connecting hole intersect the center line of the oil supply hole in the top region of the shaft.

3. The rocker arm shaft structure with dual oil channels according to claim 1, characterized in that: The shaft body is provided with several sets of through holes, and each set has two through holes arranged side by side along the axis of the shaft body.

4. The rocker arm shaft structure with dual oil channels according to claim 1, characterized in that: A third connecting hole and a fourth connecting hole are respectively provided on the shaft corresponding to the exhaust drive end and the exhaust actuator end, and the third connecting hole and the fourth connecting hole are respectively connected to the first oil passage and the second oil passage; a fifth connecting hole and a sixth connecting hole are respectively provided on the shaft corresponding to the intake drive end and the intake actuator end, and the fifth connecting hole and the sixth connecting hole are respectively connected to the first oil passage and the second oil passage.

5. The rocker arm shaft structure with dual oil passages according to claim 1, characterized in that: The oil supply hole and the through-pin hole are arranged collinearly along the axial direction of the shaft.

6. The rocker arm shaft structure with dual oil passages according to claim 5, characterized in that: The radial openings of the oil supply hole and the through-pin hole are aligned.

7. The rocker arm shaft structure with dual oil channels according to claim 1, characterized in that: The oil supply hole is a stepped hole, and different diameter sections of the stepped hole are used for matching and sealing with external oil supply components.

8. The rocker arm shaft structure with dual oil channels according to claim 7, characterized in that: A sealing ring is provided between the external oil supply component and the oil supply hole, and the sealing ring is used to seal the connection between the oil supply hole and the external oil supply component.

9. The rocker arm shaft structure with dual oil channels according to claim 1, characterized in that: The central axis of the oil supply hole is perpendicular to the mounting plane.

10. The rocker arm shaft structure with dual oil passages according to claim 1, characterized in that: The mounting plane is a plane formed by milling the outer peripheral surface of the shaft, and the extension direction of the mounting plane is parallel to the axial direction of the shaft.

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