Engine rocker arm structure with heat dissipation fins
By installing cooling fins and guide slots on the engine rocker arm, the problem of poor rocker arm heat dissipation is solved by utilizing the airflow turbulence effect and directional heat transfer, thereby improving heat dissipation efficiency and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUHUAN JUYU MACHINERY CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-06-26
AI Technical Summary
The existing engine rocker arm has poor heat dissipation performance, resulting in a shortened service life.
Heat dissipation fins and guide grooves are set on the rocker arm body, combined with V-shaped heat dissipation fins and arc-shaped oil guide holes, to improve the heat dissipation effect by utilizing airflow turbulence effect and directional heat exchange.
It improves heat dissipation efficiency, prevents localized overheating, and extends the service life of the rocker arm.
Smart Images
Figure CN224413728U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine rocker arm technology, and in particular to an engine rocker arm structure with heat dissipation fins. Background Technology
[0002] Engine valve rocker arms work in conjunction with the camshaft to perform the functions of intake and exhaust. When the engine is running, the crankshaft drives the camshaft to rotate via gears. When the camshaft's camshaft protrusion pushes up the tappet, the tappet pushes the pushrod upwards, and the pushing force acting on the rocker arm causes the rocker arm to rotate around the shaft. This causes the end of the rocker arm connected to the engine valve to compress the valve spring, causing the valve to move downwards and open. As the camshaft continues to rotate, when the camshaft's camshaft protrusion moves away from the tappet, the force acting on the rocker arm to compress the valve spring disappears, and the valve moves upwards under the tension of the valve spring, thus closing.
[0003] Currently, a Chinese patent discloses an engine rocker arm (authorization announcement number CN202370604U). This utility model includes a rocker arm body with a rocker arm bearing, valve clearance adjusting bolts on both sides of the rocker arm bearing, and wear-resistant contacts. The lubricating oil groove can guide lubricating oil to the wear-resistant contacts and valve clearance adjusting bolts. In this technical solution, there is no need to add a dedicated oil passage inside the rocker arm to complete lubrication. This solution achieves lubrication by adding oil guide grooves and lubricating oil grooves on both sides of the rocker arm bearing to guide lubricating oil to the valve clearance adjusting bolts and wear-resistant contacts at both ends. However, the above method has the following defects in actual use: its heat dissipation performance is poor, and the heat dissipation is not timely, which will affect the service life of the rocker arm. Utility Model Content
[0004] Therefore, it is necessary to provide an engine rocker arm structure with cooling fins to address the problem that poor heat dissipation performance and untimely heat dissipation will affect the service life of the rocker arm.
[0005] An engine rocker arm structure with cooling fins includes: a rocker arm body, a shaft hole on the rocker arm body, a wear-resistant contact fixedly connected to one end of the rocker arm body, an adjusting bolt on the other end of the rocker arm body, and a cooling mechanism on the rocker arm body; the cooling mechanism includes cooling fins evenly distributed on the valve contact end surface of the rocker arm body, guide grooves on the surface of the cooling fins, the cooling fins being arc-shaped, and the guide grooves corresponding to the cooling fins.
[0006] In one embodiment, the heat dissipation mechanism further includes a heat sink disposed on the surface of the wear-resistant contact, the heat sink being arranged in a V-shape.
[0007] In one embodiment, the bottom of the heat sink is provided with an arc-shaped portion, and an oil guide hole is provided on the arc-shaped portion.
[0008] In one embodiment, the heat sinks are symmetrically and evenly distributed on both sides of the wear-resistant contact, and the width of the heat sinks increases sequentially from top to bottom.
[0009] In one embodiment, the rocker arm body has weight-reducing grooves on both sides, and the weight-reducing grooves have rounded corners.
[0010] In one embodiment, the axis of the oil guide hole forms an angle of 15°-30° with the horizontal direction, and the edge of the hole is rounded.
[0011] In one embodiment, the wear-resistant contact is fixed to the end of the rocker arm body by laser welding, and the welding area forms an annular penetration reinforcement zone.
[0012] In one embodiment, the connection between the heat dissipation fins and the rocker arm body is provided with a trapezoidal tenon and mortise structure, and the width of the heat dissipation fins is 3-8mm.
[0013] Beneficial effects
[0014] A heat dissipation mechanism is set up, and the curved surface creates a turbulent airflow effect, breaking the boundary layer restriction and improving the heat dissipation efficiency compared with traditional planar fins. The guide groove guides the oil to flow along a specific path, improving the heat dissipation effect of the heat dissipation fins and realizing directional heat exchange.
[0015] The V-shaped heat sink design increases the heat dissipation area and guides the engine oil, further improving the heat dissipation effect. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the weight reduction groove of this utility model;
[0019] Figure 3 For the present utility model Figure 2 Enlarged view of the structure at point A in the middle;
[0020] Figure 4 For the present utility model Figure 2 Enlarged view of the structure at point B in the middle.
[0021] Figure label:
[0022] 100. Rocker arm body; 110. Wear-resistant contact; 111. Shaft hole; 112. Adjusting bolt; 113. Weight reduction groove; 200. Heat dissipation mechanism; 210. Heat dissipation fins; 211. Guide groove; 220. Heat dissipation fins; 221. Arc-shaped part; 222. Oil guide hole. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.
[0025] 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.
[0026] 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 and the second feature are in indirect contact 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 indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.
[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0028] The following is combined Figures 1-4 This invention describes an engine rocker arm structure with cooling fins.
[0029] In one embodiment, an engine rocker arm structure with cooling fins includes: a rocker arm body 100, a shaft hole 111 on the rocker arm body 100, a wear-resistant contact 110 fixedly connected to one end of the rocker arm body 100, an adjusting bolt 112 on the other end of the rocker arm body 100, and a cooling mechanism 200 on the rocker arm body 100; the cooling mechanism 200 includes cooling fins 210 evenly distributed on the valve contact end surface of the rocker arm body 100, a guide groove 211 on the surface of the cooling fins 210, the cooling fins 210 being arc-shaped, and the guide groove 211 corresponding to the cooling fins 210.
[0030] like Figure 3 As shown, the heat dissipation mechanism 200 also includes a heat sink 220 disposed on the surface of the wear-resistant contact 110, and the heat sink 220 is arranged in a V-shape.
[0031] In this embodiment, when the engine is running, the guide grooves 211 on the surface of the arc-shaped heat dissipation fins 210 disturb the airflow. The high-speed airflow impacts the V-shaped heat dissipation fins 220 and splits into double vortices, accelerating the flow along the gradually widening flow channel, thus improving heat exchange efficiency. The heat dissipation fins 210 increase the contact area with air, improving heat dissipation. Furthermore, the heat dissipation fins 210 are located at the upper valve contact end, where they receive heat conducted from the high-temperature exhaust valve. The fins help dissipate this heat, preventing overheating in this area from affecting valve clearance or material properties. Heat transfer to the center of the rocker arm body 100 is avoided. The heat dissipation fins 220 are located on both sides of the wear-resistant contact 110, which is the frictional heat source of the rocker arm. The fins directly dissipate heat from this location, preventing localized overheating that could lead to oil film failure, material annealing, or abnormal wear.
[0032] The surface of the heat dissipation fins 210 is coated with an Al2O3-ZrO2 gradient ceramic coating, with the thermal conductivity gradually changing from high to low. This accelerates heat conduction in the high-temperature zone and suppresses heat return in the low-temperature zone.
[0033] like Figure 3As shown, the bottom of the heat sink 220 is provided with an arc-shaped portion 221, and an oil guide hole 222 is provided on the arc-shaped portion 221. The axis of the oil guide hole 222 forms an angle of 15°-30° with the horizontal direction, and the edge of the hole is rounded.
[0034] In this embodiment, the arc-shaped portion 221 has an oil guide hole 222, and the edge of the hole is rounded to avoid carbon buildup.
[0035] like Figure 3 As shown, the heat sink 220 is symmetrically and evenly distributed on both sides of the wear-resistant contact 110, and the width of the heat sink 220 increases from top to bottom.
[0036] In this embodiment, the lower heat sink 220 is closer to the bottom of the wear-resistant contact 110, where the temperature is higher and a higher heat dissipation effect is required. Since the temperature is conducted from bottom to top, the required upper temperature angle is lower, and the heat sink 220 is narrower to reduce weight.
[0037] like Figure 1 and Figure 2 As shown, the rocker arm body 100 has weight reduction grooves 113 on both sides, and the weight reduction grooves 113 have rounded corners.
[0038] In this embodiment, a weight-reducing groove 113 is provided to reduce the weight of the rocker arm body 100, and the groove wall is rounded to reduce stress concentration. Honeycomb-shaped reinforcing ribs are distributed inside the groove, which reduces weight while improving structural strength.
[0039] like Figure 1 and Figure 2 As shown, the wear-resistant contact 110 is fixed to the end of the rocker arm body 100 by laser welding, and the welding area forms an annular weld reinforcement zone. The connection between the heat dissipation fin 210 and the rocker arm body 100 is provided with a trapezoidal tenon and mortise structure, and the width of the heat dissipation fin 210 is 3-8mm.
[0040] In this embodiment, the annular weld zone enhances the thermal deformation synergy between the wear-resistant contact 110 and the main rocker arm body 100, improves the structural strength at the connection, and the trapezoidal tenon and mortise structure eliminates casting thermal stress cracks and improves shear strength.
[0041] Working principle: The rocker arm body 100 is installed inside the engine. When the engine is running, the camshaft pushes the wear-resistant contact 110, generating high temperatures at the contact surface. This heat is rapidly conducted to the rocker arm body 100 via the laser-welded weld penetration reinforcement band, with the high-temperature area concentrated at the valve contact end and the bottom of the wear-resistant contact 110. High-speed airflow impacts the heat sink 220, splitting into a double vortex flow that accelerates along the surface of the arc-shaped portion 221, carrying away most of the heat from the wear-resistant contact 110. Splashed engine oil, through the inclined oil guide hole 222, covers the high-temperature area of the arc-shaped portion 221 under centrifugal force, dissipating heat from the wear-resistant contact 110; the oil also flows through the guide groove 211 across the surface of the heat sink fins 210, carrying away heat.
[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0043] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.
Claims
1. An engine rocker arm structure with cooling fins, characterized in that, include: A rocker arm body (100) is provided with a shaft hole (111), a wear-resistant contact (110) is fixedly connected to one end of the rocker arm body (100), an adjusting bolt (112) is provided at the other end of the rocker arm body (100), and a heat dissipation mechanism (200) is provided on the rocker arm body (100). The heat dissipation mechanism (200) includes heat dissipation fins (210) evenly distributed on the valve contact end surface of the rocker arm body (100). The surface of the heat dissipation fins (210) is provided with guide grooves (211). The heat dissipation fins (210) are arranged in an arc shape. The guide grooves (211) are correspondingly arranged with the heat dissipation fins (210).
2. The engine rocker arm structure with cooling fins according to claim 1, characterized in that, The heat dissipation mechanism (200) further includes a heat sink (220) disposed on the surface of the wear-resistant contact (110), the heat sink (220) being arranged in a V-shape.
3. The engine rocker arm structure with cooling fins according to claim 2, characterized in that, The bottom of the heat sink (220) is provided with an arc-shaped part (221), and an oil guide hole (222) is provided on the arc-shaped part (221) through the arc-shaped part (221).
4. The engine rocker arm structure with cooling fins according to claim 3, characterized in that, The heat sink (220) is symmetrically and evenly distributed on both sides of the wear-resistant contact (110), and the width of the heat sink (220) increases from top to bottom.
5. The engine rocker arm structure with cooling fins according to claim 1, characterized in that, The rocker arm body (100) has weight reduction grooves (113) on both sides, and the weight reduction grooves (113) have rounded corners.
6. The engine rocker arm structure with cooling fins according to claim 3, characterized in that, The axis of the oil guide hole (222) forms an angle of 15°-30° with the horizontal direction, and the edge of the hole is rounded.
7. The engine rocker arm structure with cooling fins according to claim 1, characterized in that, The wear-resistant contact (110) is fixed to the end of the rocker arm body (100) by laser welding, and the welding area forms an annular weld depth strengthening zone.
8. The engine rocker arm structure with cooling fins according to claim 1, characterized in that, The connection between the heat dissipation fins (210) and the rocker arm body (100) is provided with a trapezoidal tenon and mortise structure, and the width of the heat dissipation fins (210) is 3-8mm.