A bushing for a mirror image rocker arm

Abstract

The utility model discloses a kind of bushings for mirror image rocker, comprising: coaxial arrangement and fixed connection of inner layer and outer layer, inner layer is used to contact with rocker shaft, outer layer is used to contact with rocker;The inner surface of inner layer is provided with oil receiving groove, the area covered by oil receiving groove in the circumferential direction forms circumferential area, and the circumferential area is jointly combined by the first movement track of rocker shaft oil hole relative to bushing when left rocker works and the second movement track of rocker shaft oil hole relative to bushing when right rocker works;Oil receiving groove is provided with first oil hole, and first oil hole is communicated with oil receiving groove, outer layer is provided with second oil hole, and second oil hole is communicated with first oil hole and second oil hole is communicated with oil supply hole of rocker;Through the above mode, the utility model can satisfy the bidirectional lubrication demand of mirror image rocker by a general bushing structure, avoid misloading and guarantee lubrication reliability.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a bushing for a mirror rocker arm. Background Technology

[0002] In the valve train of an engine, rocker arm assemblies are often arranged in a mirror-symmetrical configuration. To ensure lubrication between the rocker arm and its shaft, bushings are typically installed, with oil holes on the bushings to allow lubricating oil to be delivered from the rocker arm shaft's oil passages to the friction pairs (such as the foot and rollers) of the rocker arm. In existing technology, to meet the continuous lubrication requirements of a specific rocker arm within its working angle range, the position and shape of the oil holes on the bushings need to be specifically designed according to the rocker arm's rotation trajectory. For left and right rocker arms arranged in a mirror-symmetrical configuration, since their motion trajectories are also mirror-symmetrical, the traditional solution is to design two bushings with approximately symmetrical structures, one specifically for the left rocker arm and the other for the right rocker arm. However, this approximately symmetrical bushing structure is highly susceptible to confusion due to its similar appearance during actual production, warehousing, assembly, and inspection, leading to the risk of incorrect assembly and increasing the difficulty and cost of quality management. Furthermore, designing and manufacturing two different bushings also requires two sets of process equipment and management procedures, resulting in increased manufacturing costs for the components. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a bushing for a mirror rocker arm that can meet the bidirectional lubrication requirements of the mirror rocker arm through a universal bushing structure, avoid misinstallation and ensure lubrication reliability.

[0004] To solve the above-mentioned technical problems, the present invention provides a bushing for a mirror-type rocker arm, comprising: an inner layer and an outer layer coaxially arranged and fixedly connected, the inner layer being for contacting the rocker arm shaft, and the outer layer being for contacting the rocker arm; an oil receiving groove is formed on the inner surface of the inner layer, the area covered by the oil receiving groove in the circumferential direction forming a circumferential region, the circumferential region being defined by the first motion trajectory of the rocker arm shaft oil hole relative to the bushing when the left rocker arm is working and the second motion trajectory of the rocker arm shaft oil hole relative to the bushing when the right rocker arm is working; a first oil hole is formed in the oil receiving groove, the first oil hole being connected to the oil receiving groove, and a second oil hole is formed in the outer layer, the second oil hole being connected to the first oil hole and also connected to the oil supply hole of the rocker arm.

[0005] Preferably, the oil receiving groove includes a receiving groove, an oil storage groove, a first flow channel, a second flow channel, and an arc-shaped groove. The receiving groove cooperates with the rocker arm shaft oil hole to receive the lubricating oil flowing out of the rocker arm shaft oil hole. The first flow channel is located between the receiving groove and the oil storage groove and is used to transport part of the lubricating oil to the oil storage groove, thereby storing a certain amount of lubricating oil to ensure that there is sufficient lubricating oil between the rocker arm shaft and the bushing. The second flow channel is located between the receiving groove and the arc-shaped groove and is used to transport part of the lubricating oil to the arc-shaped groove. The first oil hole is opened in the arc-shaped groove, so that the lubricating oil enters the second oil hole through the first oil hole and enters the oil supply hole of the rocker arm.

[0006] Preferably, the width of the receiving groove is greater than the width of the first flow channel and the second flow channel.

[0007] Preferably, the first oil hole is located at both ends of the arc-shaped groove.

[0008] The beneficial effects of this invention are as follows: The circumferential area of ​​the oil receiving groove is defined by the movement trajectories of the left and right rocker arms, allowing a single component to meet the lubrication needs of the mirror-symmetrical rocker arms. This effectively avoids the risk of mis-installation of the left and right bushings and reduces management and production costs. Simultaneously, its integrated multi-chamber oil groove reliably collects, stores, and distributes lubricating oil, ensuring continuous and stable lubrication between the rocker arm shaft and bushings, as well as at the rocker arm hinge points, thus improving the reliability of the system. Attached Figure Description

[0009] Figure 1 This is a schematic diagram showing the positional relationship between the mirror-shaped rocker arm and the rocker arm axis; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is an unfolded view of the bushing of this utility model; Figure 4 This is a cross-sectional view of the bushing and the mirror-arranged rocker arm of this utility model during assembly.

[0010] The components in the attached diagram are labeled as follows: 11. Inner layer; 12. Outer layer; 2. Oil receiving groove; 21. Receiving groove; 22. Oil storage groove; 23. First flow channel; 24. Second flow channel; 25. Arc groove; 3. First oil hole; 4. Second oil hole; 5. Rocker arm; 6. Rocker arm shaft. Detailed Implementation

[0011] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0012] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0013] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0014] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0015] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0016] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0017] Unless otherwise specified, physical quantities in formulas should be understood as basic quantities of SI base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0018] Example: refer to Figures 1-4A bushing for a mirror-type rocker arm includes: an inner layer 11 and an outer layer 12 coaxially arranged and fixedly connected. The inner layer 11 is used to contact the rocker arm shaft 6, and the outer layer 12 is used to contact the rocker arm 5. An oil receiving groove 2 is formed on the inner surface of the inner layer 11. The area covered by the oil receiving groove 2 in the circumferential direction of the inner layer 11 forms a circumferential region. The circumferential region is defined by the first motion trajectory of the rocker arm shaft oil hole relative to the bushing when the left rocker arm 5 is working and the second motion trajectory of the rocker arm shaft oil hole relative to the bushing when the right rocker arm 5 is working. A first oil hole 3 is formed in the oil receiving groove 2 and communicates with the oil receiving groove 2. A second oil hole 4 is formed in the outer layer 12 and communicates with the first oil hole 3 and the oil supply hole of the rocker arm 5. By creating an oil collecting groove 2 on the surface of the inner layer 11, the circumferential coverage area of ​​the oil collecting groove 2 is defined by the combined motion trajectory of the oil holes of the rocker arm shaft 6 when the left and right rocker arms 5 are working, thus forming a composite oil collection area that can simultaneously adapt to the swinging conditions of both rocker arms 5. This fundamentally solves the problem of lubrication blind spots that may occur in the application of mirror-type rocker arms 5 due to the different relative motion trajectories caused by traditional single oil grooves, ensuring that lubricating oil can be reliably captured and collected regardless of whether the left or right rocker arm 5 is working. At the same time, by creating a first oil hole 3 in the oil collecting groove 2 of the inner layer 11 and connecting it with the second oil hole 4 of the outer layer 12, an internal oil guiding passage is formed from the rocker arm shaft 6 to the oil supply hole of the rocker arm 5, realizing efficient and directional transmission of lubricating oil, providing stable and reliable lubrication guarantee for the hinge point of the rocker arm 5, effectively reducing the wear between the bushing and the rocker arm shaft 6, and improving the service life and reliability of the entire rocker arm 5 assembly.

[0019] refer to Figures 1-4The oil receiving groove 2 includes a receiving groove 21, an oil storage groove 22, a first flow channel 23, a second flow channel 24, and an arc-shaped groove 25. The receiving groove 21 cooperates with the oil hole of the rocker arm shaft 6 to receive the lubricating oil flowing out of the oil hole of the rocker arm shaft 6. The first flow channel 23 is located between the receiving groove 21 and the oil storage groove 22, and is used to transport part of the lubricating oil to the oil storage groove 22, thereby storing a certain amount of lubricating oil to ensure that there is sufficient lubricating oil between the rocker arm shaft 6 and the bushing. The second flow channel 24 is located between the receiving groove 21 and the arc-shaped groove 25, and is used to transport part of the lubricating oil to the arc-shaped groove 25. The first oil hole 3 is opened in the arc-shaped groove 25, so that the lubricating oil enters the second oil hole 4 through the first oil hole 3 and then enters the oil supply hole of the rocker arm 5. Through the receiving groove 21, the oil storage groove 22, the first flow channel 23, the second flow channel 24, and the arc-shaped groove 25, the distribution and management of lubricating oil are realized. The receiving groove 21 serves as the initial interface, responsible for efficiently capturing lubricating oil from the oil hole of the rocker arm shaft 6. The first flow channel 23 guides part of the oil to the oil storage tank 22 for temporary storage, forming a lubricating oil buffer zone. This is particularly crucial during intermittent oil supply or oil pressure fluctuations, ensuring a continuous supply of sufficient lubricating oil to the friction pair between the bushing and the rocker arm shaft 6, preventing dry friction. The second flow channel 24 delivers another portion of the oil to the arc-shaped groove 25, and through the first oil hole 3 on the arc-shaped groove 25, accurately guides the lubricating oil into the oil passage leading to the rocker arm 5. This achieves a comprehensive function integrating receiving, storage, diversion, and delivery, ensuring that the lubrication system remains efficient and stable under various operating conditions.

[0020] refer to Figures 1-4 The width of the receiving groove 21 is greater than that of the first flow channel 23 and the second flow channel 24, thus enabling it to quickly and massively collect lubricating oil from the oil hole of the rocker arm shaft 6. The receiving groove 21, with its larger opening area, ensures the rapid and large-scale collection of lubricating oil flowing instantaneously from the oil hole of the rocker arm shaft 6, effectively reducing splashing and loss of lubricating oil at the inlet and improving initial oil capture efficiency. This "wide inlet, narrow outlet" structure, like a funnel, first gathers the oil flow and then distributes it controllably through a narrower flow channel. This ensures sufficient oil supply while avoiding uncontrollable problems caused by instantaneous overflow in the oil circuit system, laying a solid foundation for subsequent oil storage and precise delivery.

[0021] refer to Figures 1-4The first oil hole 3 is located at both ends of the arc-shaped groove 25, facilitating the collection of lubricating oil. This design fully utilizes the flow characteristics of lubricating oil within the arc-shaped groove 25. When the lubricating oil enters the arc-shaped groove 25 through the second flow channel 24, it diffuses along the channel to both ends. Positioning the first oil hole 3 at these two locations effectively creates collection points at the ends of the oil path, efficiently receiving and guiding the diffused lubricating oil. This ensures that the oil is successfully captured regardless of its flow direction, preventing accumulation or stagnation within the groove. This significantly improves the transmission efficiency from the oil receiving groove 2 to the first oil hole 3 and the second oil hole 4, reduces the stringent requirements on the lubricating oil flow direction, and enhances the reliability and adaptability of the lubrication system.

[0022] Working process: When the engine is running, pressurized lubricating oil is periodically sprayed from the oil hole of the rocker arm shaft 6. Since the bushing is installed in the mirror-arranged left and right rocker arms 5, it swings around the rocker arm shaft 6 along with the rocker arms 5. Therefore, the position of the oil hole on the rocker arm shaft 6 relative to the inner surface of the bushing is dynamically changing. The oil receiving groove 2 opened on the surface of the inner layer 11 of the bushing has a circumferential area defined by the two movement trajectories of the oil hole on the rocker arm shaft 6 relative to the bushing when the left and right rocker arms 5 are working. This means that regardless of whether the left or right rocker arm 5 is working, the oil hole on the rocker arm shaft 6 will always sweep across the area of ​​this oil receiving groove 2 during the swing, thus ensuring that the lubricating oil can always be reliably received into the oil receiving groove 2, solving the lubrication blind spot problem that may occur with traditional bushings under mirror-swing conditions.

[0023] The lubricating oil is first captured in large quantities by the receiving groove 21 in the oil receiving groove 2. Then, the oil is divided inside the oil receiving groove 2: a portion of the lubricating oil is guided through the first flow channel 23 into the oil storage tank 22 for storage, forming a lubricating oil reservoir. Its function is to continuously and stably provide lubrication to the friction pair between the inner bushing layer 11 and the rocker arm shaft 6, preventing dry friction during oil supply intervals or when oil pressure is unstable. The other portion of the lubricating oil is guided to the arc-shaped groove 25 through the second flow channel 24. After entering the arc-shaped groove 25, the lubricating oil diffuses along the groove to both ends and is eventually collected by the first oil holes 3 at both ends of the arc-shaped groove 25. The lubricating oil then enters the second oil hole 4 penetrating the outer bushing layer 12 through the first oil hole 3, and is finally delivered to the oil supply hole of the rocker arm 5 body, providing the necessary lubrication and cooling for the contact points between the rocker arm 5 and other components (such as rollers or valve bridges). The entire working process achieves efficient collection, reasonable storage, and precise directional delivery of limited lubricating oil, thereby significantly improving the lubrication reliability and durability of the mirror rocker arm 5 system under various working conditions.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A bushing for a mirror-type rocker arm, characterized in that, include: An inner layer (11) and an outer layer (12) are coaxially arranged and fixedly connected. The inner layer (11) is used to contact the rocker arm shaft (6), and the outer layer (12) is used to contact the rocker arm (5). The inner surface of the inner layer (11) is provided with an oil receiving groove (2). The area covered by the oil receiving groove (2) in the circumferential direction forms a circumferential region. The circumferential region is defined by the first motion trajectory of the rocker arm shaft oil hole relative to the bushing when the left rocker arm (5) is working and the second motion trajectory of the rocker arm shaft oil hole relative to the bushing when the right rocker arm (5) is working. The oil receiving groove (2) has a first oil hole (3) connected to the oil receiving groove (2), and the outer layer (12) has a second oil hole (4) connected to the first oil hole (3) and connected to the oil supply hole of the rocker arm (5).

2. A bushing for a mirror-type rocker arm according to claim 1, characterized in that: The oil receiving groove (2) includes a receiving groove (21), an oil storage groove (22), a first flow channel (23), a second flow channel (24), and an arc-shaped groove (25). The receiving groove (21) is matched with the oil hole of the rocker arm shaft (6) and is used to receive the lubricating oil flowing out of the oil hole of the rocker arm shaft (6). The first flow channel (23) is located between the receiving groove (21) and the oil storage groove (22) and is used to transport part of the lubricating oil to the oil storage groove (22) so as to store a certain amount of lubricating oil to ensure that there is enough lubricating oil between the rocker arm shaft (6) and the bushing. The second flow channel (24) is located between the receiving groove (21) and the arc-shaped groove (25) and is used to transport part of the lubricating oil to the arc-shaped groove (25). The first oil hole (3) is opened in the arc-shaped groove (25) so that the lubricating oil enters the second oil hole (4) through the first oil hole (3) and enters the oil supply hole of the rocker arm (5).

3. A bushing for a mirror-type rocker arm according to claim 2, characterized in that: The width of the receiving groove (21) is greater than the width of the first flow channel (23) and the second flow channel (24).

4. A bushing for a mirror-type rocker arm according to claim 2, characterized in that: The first oil hole (3) is located at both ends of the arc groove (25).

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