Tappet capable of improving lubrication of tappet and cam

Abstract

The utility model discloses a tappet capable of improving lubrication of the tappet and a cam, which comprises a tappet rod and a tappet base, the tappet base is arranged at the lower end of the tappet rod, and the lower end face of the tappet base is in contact with the cam; the tappet rod penetrates through the cylinder cover and the cylinder body and is vertically arranged with a gap, and a plurality of oil holes are formed in the tappet base and penetrate through the upper surface and the lower surface of the tappet base. On the premise of not obviously changing the arrangement scheme of the existing centrally-mounted camshaft and on the basis of not changing the original lubricating system architecture, the plurality of oil holes are formed in the tappet base, so that lubricating oil can reach the contact surface of the tappet base and the cam from the oil holes, the lubricating effect of a working surface is obviously improved, and the service life of the tappet base is prolonged. The improved mode has the remarkable advantages of being simple in structure, high in compatibility, low in improvement cost and the like, and a feasible technical path is provided for improving the reliability of the middle-mounted camshaft system.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a tappet that can improve the lubrication of the tappet and the cam. Background Technology

[0002] In modern internal combustion engine valve trains, the centrally located camshaft arrangement is widely used due to its advantages of both compact structure and transmission efficiency. This structure uses tappets as the core transmission component to convert the rotational motion of the camshaft into linear reciprocating motion, thereby driving the valves to achieve precise opening and closing control. As a key kinematic pair, the working surfaces of the tappets and camshafts are subjected to significant contact stress and relative sliding speed during high-frequency reciprocating contact. The resulting friction directly affects the reliability and durability of the valve train system. Existing technologies mainly employ two methods: forced lubrication and splash lubrication. The latter relies on oil droplets and mist splashed by crankshaft rotation or other moving parts for lubrication. However, in practical engineering applications, the vertical distance of the oil pan is relatively large, and it is often surrounded by components such as the cylinder block and timing transmission mechanism. This makes it easy for the oil splash trajectory required for splash lubrication to be blocked, resulting in the lubricating medium failing to continuously and evenly reach the contact area between the tappets and camshafts. Insufficient lubrication can cause a number of problems. Abrasive wear caused by direct contact between metal surfaces will increase the roughness of the working surface, which will intensify stress concentration. Metal debris generated by abnormal wear may also block oil passages and cause a chain of failures. At the same time, the increase in frictional power consumption will lead to a decrease in the efficiency of the valve train, affecting engine power output and fuel economy.

[0003] To address the inherent drawbacks of splash lubrication, existing technologies have attempted to improve lubrication by optimizing the engine oil pan structure, adding deflectors, or improving the surface coating of the tappets. For example, adding oil guide grooves to the side of the cylinder block guides splashed oil to the camshaft area. However, these solutions generally have limitations: complex oil guide devices increase engine weight and manufacturing costs and may conflict with the layout of other components; while surface coating technology can alleviate wear to some extent, it cannot fundamentally solve the problem of insufficient lubrication medium supply, and the durability of coating materials still needs long-term verification. Especially for existing, finalized engine designs, the above-mentioned improvement solutions often require redesigning core components such as the cylinder block and oil pan, resulting in high modification costs and long cycles, making it difficult to meet the upgrade requirements of existing engine production lines. Therefore, how to improve splash lubrication efficiency through optimized design of the tappet structure without significantly altering the existing mid-mounted camshaft layout has become a pressing technical problem in this field.

[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 invention is to propose a tappet that can improve the lubrication of the tappet and the cam, so as to solve the technical problem in the above-mentioned splash lubrication method that the lubricating medium is difficult to continuously and evenly reach the contact area of ​​the tappet and the cam.

[0006] Therefore, this utility model proposes a tappet that can improve the lubrication of the tappet and the cam.

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

[0008] A tappet for improving the lubrication of tappets and cams includes a tappet rod and a tappet base. The tappet base is disposed at the lower end of the tappet rod, and the lower end face of the tappet base is in contact with the cam. The tappet rod is vertically disposed with a gap through the cylinder head and cylinder block, and a plurality of oil holes are provided on the tappet base, penetrating its upper and lower surfaces.

[0009] Preferably, the oil hole is vertically arranged, penetrating the upper and lower surfaces of the tappet base.

[0010] Preferably, the oil hole is located within the cam profile.

[0011] Preferably, three oil holes are arranged around the central axis of the tappet base.

[0012] Preferably, the three oil holes are arranged at equal 120° intervals, with their axial projections forming an equilateral triangle.

[0013] Preferably, two of the oil holes are spaced 140° apart, and the other oil hole is spaced 110° apart from the adjacent oil hole.

[0014] The beneficial effects of this utility model compared with the prior art include:

[0015] 1. Without significantly altering the existing central camshaft arrangement or the original lubrication system architecture, this utility model provides several oil holes on the tappet base, allowing lubricating oil to reach the contact surface between the tappet base and the cam, significantly improving the lubrication effect of the working surface and reducing the risk of wear due to insufficient lubrication. This improvement method has significant advantages such as simple structure, strong compatibility, and low modification cost, providing a practical and feasible technical path for improving the reliability of central camshaft systems.

[0016] 2. The oil hole of this utility model is vertically set through the upper and lower surfaces of the tappet base to increase the oil flow rate, so that the oil reaching the upper surface of the tappet can better reach the contact surface between the tappet base and the cam, ensuring instantaneous lubrication response of the contact surface between the cam and the tappet and improving the lubrication effect; the oil in the vertical channel is affected by gravity and oil pressure, and air bubbles can be directly discharged along the channel, which reduces the risk of cavitation compared with oblique holes.

[0017] 3. The oil hole of this utility model is set inside the cam profile, so that the oil hole can directly supply oil to the working surface of the cam, and the oil can be directly sprayed onto the contact surface between the tappet and the cam, reducing the lubrication response time and improving the lubrication effect. Attached Figure Description

[0018] Figure 1 This is a first schematic diagram of a specific embodiment of the present utility model.

[0019] Figure 2 This is a second schematic diagram of a specific embodiment of the present utility model (in... Figure 1 (The cylinder block is hidden on the basis of the structure).

[0020] Figure 3 This is a specific embodiment of the present utility model. Figure 2 A magnified view of point A in the middle.

[0021] Figure 4 This is the third schematic diagram of a specific embodiment of the present utility model.

[0022] Figure 5 This is a specific embodiment of the present utility model. Figure 4 Sectional view along the middle FF.

[0023] Figure 6 This is a specific embodiment of the present utility model. Figure 5 A magnified view of point B in the middle.

[0024] Explanation of reference numerals in the attached diagram: 11-Taper rod; 12-Taper base; 121-Oil hole; 122-Oil groove; 13-Camshaft; 131-Cam; 14-Cylinder head; 15-Cylinder block; 151-Oil return chamber. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] A type of tappet that can improve lubrication between the tappet and the cam, such as Figures 1-6 As shown, the tappet includes a tappet rod 11 and a tappet base 12. The tappet base 12 is disposed at the lower end of the tappet rod 11, and the lower end face of the tappet base 12 is in contact with the cam 131. The tappet rod 11 is vertically disposed with a gap through the cylinder head 14 and the cylinder block 15. A plurality of oil holes 121 are provided on the tappet base 12, penetrating its upper and lower surfaces, so that lubricating oil can flow from the oil return chamber 151 of the cylinder block 15 through the gap between the tappet rod 11 and the cylinder block 15 to the upper surface of the tappet base 12, and finally reach the contact surface between the tappet base 12 and the cam 131 through the oil holes 121, thereby improving the lubrication effect of the contact surface.

[0028] The above solution is based on the splash lubrication method. Without significantly changing the existing central camshaft 13 arrangement and without altering the original lubrication system architecture (i.e., the lubricating oil splashed into the engine cylinder block 15 can still lubricate the cam 131), several oil holes 121 are provided on the tappet base 12, so that the lubricating oil can reach the contact surface between the tappet base 12 and the cam 131 through the oil holes 121. This significantly improves the lubrication effect of the working surface and reduces the risk of wear due to insufficient lubrication. This improvement method has significant advantages such as simple structure, strong compatibility, and low modification cost, providing a practical and feasible technical path for improving the reliability of the central camshaft 13 system.

[0029] In some examples of this embodiment, several oil holes 121 are vertically arranged through the upper and lower surfaces of the tappet base 12. The oil path of the vertical holes has no bends, and the oil flow rate is increased, so that the oil reaching the upper surface of the tappet base 12 can better reach the contact surface between the tappet base 12 and the cam 131, ensuring instantaneous lubrication response between the cam 131 and the tappet contact surface and improving the lubrication effect. The oil in the vertical channel is affected by gravity and oil pressure, and air bubbles can be directly discharged along the channel, reducing the risk of cavitation compared to oblique holes.

[0030] Specifically, in order to better lubricate the working surface (i.e., the contact surface between the tappet base 12 and the cam 131), such as Figure 3 As shown, the oil hole 121 is located within the contour of the cam 131, that is, the oil hole 121 is located within the axial and radial contours of the cam 131, so that the oil hole 121 can directly supply oil to the working surface of the cam 131, and the oil can be directly sprayed onto the contact surface between the tappet base 12 and the cam 131, reducing the lubrication response time and improving the lubrication effect. Of course, the oil hole 121 should also be located away from the edge of the cam 131 so that as much oil as possible can reach the working surface.

[0031] To ensure the strength of the tappet, the diameter and number of oil holes 121 should not be too large. In some examples of this embodiment, three oil holes 121 are arranged around the central axis of the tappet base 12. In some examples, the three oil holes 121 are arranged at equal 120° intervals, with the axis projection forming an equilateral triangle. That is, the distance from the center line of the three oil holes 121 to the central axis of the tappet base 12 is the same, so that the oil spray covers a 360° range of the working surface of the cam 131, improving lubrication uniformity; it also makes the circumferential oil film pressure of the working surface uniform, which can reduce the risk of tappet wear. In other examples, two of the oil holes 121 are spaced 140° apart, and another oil hole 121 is spaced 110° apart from the adjacent oil hole 121, which is biased towards the area of ​​maximum contact pressure of the cam 131 (such as the position corresponding to the tip of the cam 131), so that the amount of oil sprayed in the area of ​​maximum contact pressure of the cam 131 increases, effectively reducing abrasive wear on the contact surface between the cam 131 and the tappet base 12.

[0032] In other examples of this embodiment, such as Figure 3 As shown, an oil groove 122 is provided at the junction of the tappet rod 11 and the tappet base 12. The position of the oil hole 121 coincides at least partially with the position of the oil groove 122, so that the oil can be partially stored in the oil groove 122 and can continuously supply lubricating oil to the contact surface between the tappet base 12 and the cam 131 from the oil hole 121. The oil is partially stored in the oil groove 122 and slowly released through the oil hole 121, which optimizes the lubricating oil supply and can store enough oil to cope with instantaneous oil supply fluctuations, thus avoiding dry friction on the contact surface between the tappet base 12 and the cam 131.

[0033] 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.

[0034] 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 liftable lifter and cam lubricated lifter post, characterized by: The application relates to a tappet rod (11) and a tappet base (12) arranged at the lower end of the tappet rod (11), the lower end face of the tappet base (12) being arranged in contact with a cam (131); the tappet rod (11) is arranged vertically and with a gap through a cylinder head (14) and a cylinder block (15), a plurality of oil holes (121) are arranged on the tappet base (12) and pass through the upper surface and the lower surface thereof.

2. The liftable lifter and cam-lubricated lifter as set forth in claim 1, characterized in that: The oil holes (121) are arranged vertically through the upper surface and the lower surface of the tappet base (12).

3. The liftable lifter and cam lubricated lifter of claim 1 wherein: The oil holes (121) are arranged in the profile of the cam (131).

4. The liftable lifter and cam lubricated lifter of claim 1 wherein: Three oil holes (121) are arranged around the central axis of the tappet base (12).

5. The liftable lifter and cam lubricated lifter of claim 4 wherein: The three oil holes (121) are arranged at equal angles of 120 DEG, and the axis projection is in the shape of an equilateral triangle.

6. The liftable lifter and cam lubricated lifter of claim 1 wherein: Two of the oil holes (121) are arranged at an interval of 140 DEG, and the other oil hole (121) is arranged at an interval of 110 DEG from the adjacent oil hole (121).

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