Valve actuating mechanism with roller tappet

Abstract

The utility model discloses a valve actuating mechanism with a roller tappet, which comprises the roller tappet, a valve actuating mechanism, a valve actuating mechanism, a valve actuating mechanism and a valve actuating mechanism, and is characterized in that the roller tappet comprises a tappet body, a roller and a U-shaped bracket; the tappet body is cylindrical, and a positioning piece is arranged on the side wall of the tappet body; the U-shaped support comprises two symmetrical vertical walls, the U-shaped support is located at one end of the tappet body, the U-shaped support can contain the idler wheel, connecting structures are arranged on the two vertical walls, and the idler wheel is rotatably fixed to the U-shaped support through the connecting structures; and the air cylinder body is internally provided with a tappet chamber, the tappet chamber is used for containing the roller tappet, the tappet chamber is internally provided with a tappet movement guide rail, and the tappet movement guide rail can be matched with the positioning piece to prevent the roller tappet from rotating when moving up and down. And the movement guide rail is arranged to prevent the tappet from rotating in the movement process, and an engine oil flowing channel is arranged to fully lubricate moving parts.

Description

Technical Field

[0001] The utility model relates to the technical field of engine parts, in particular to a valve train with a roller tappet. Background Art

[0002] In a traditional in - line camshaft engine, the camshaft is arranged in the middle of the cylinder block. The rotation of the camshaft drives the tappet to reciprocate up and down in the tappet chamber of the cylinder block. The tappet pushes the push rod, and transmits the force to the rocker shaft, valve, etc., to realize the opening and closing of the valve. Among them: in terms of contact, the contact between the tappet and the camshaft is sliding friction, which belongs to a "hard - on - hard" contact method. The contact part between the tappet and the camshaft is easily worn, resulting in component failure; in terms of lubrication, the traditional arrangement only relies on the engine oil flowing down due to gravity from the cylinder head to lubricate the three parts that need to contact each other, namely the push rod and the tappet, the tappet and the camshaft, and the tappet and the cylinder block tappet chamber. The lubrication efficiency is low, and it is easy to cause dry friction between components, resulting in excessive wear.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a valve train with a roller tappet that can reduce contact stress and is fully lubricated.

[0005] To achieve the above purpose, the present utility model provides a valve train with a roller tappet, including: a roller tappet, including a tappet body, a roller, and a U - shaped bracket; the tappet body is cylindrical, and a positioning member is provided on the side wall of the tappet body; the U - shaped bracket includes two symmetric vertical walls, the U - shaped bracket is located at one end of the tappet body, the U - shaped bracket can accommodate the roller, and a connection structure is provided on the two vertical walls, and the roller is rotatably fixed on the U - shaped bracket through the connection structure; a cylinder block, a tappet chamber is provided in the cylinder block, the tappet chamber is used to accommodate the roller tappet, and a tappet movement guide rail is provided in the tappet chamber, and the tappet movement guide rail can cooperate with the positioning member to prevent the roller tappet from rotating during the up - and - down movement.

[0006] In one or more embodiments, a first oil inlet is further provided on the side wall of the tappet body, and a second oil inlet corresponding to the first oil inlet is provided in the cylinder block. When the first oil inlet moves to be aligned with the second oil hole, lubricating oil can directly enter the inside of the roller tappet through the second oil inlet and the first oil inlet.

[0007] In one or more embodiments, an oil collecting tank is provided inside the tappet body, an oil outlet is provided at the bottom of the oil collecting tank, one end of the oil outlet is located at the bottom of the oil collecting tank, and the other end is located at the top of the roller.

[0008] In one or more embodiments, the width of the U-shaped bracket is smaller than the width of the tappet body.

[0009] In one or more embodiments, the connection mechanism is a fastening pin, and the two vertical walls of the U-shaped bracket are respectively provided with a first through hole and a second through hole for installing the fastening pin.

[0010] In one or more embodiments, the oil outlet is a tapered structure that is thicker at the top and thinner at the bottom.

[0011] In one or more embodiments, the positioning member is a positioning pin protruding from the tappet body, and the tappet motion guide rail is a linear groove whose width and depth match those of the positioning pin.

[0012] The utility model provides a valve mechanism with a roller tappet, wherein the bottom of the tappet is provided with a roller, and when the camshaft moves, the roller moves accordingly, and the sliding friction of the traditional solution is changed into rolling friction, thereby reducing contact stress and wear. A tappet movement guide rail is provided in the tappet chamber of the cylinder body, and the roller tappet can be fixed in cooperation with the positioning piece on the roller tappet, so that the roller tappet will not rotate along the circumferential direction when it moves up and down in the tappet chamber, thereby ensuring that the roller and the camshaft run in parallel. The roller tappet is provided with a first oil inlet, and the cylinder main oil channel is provided with a corresponding second oil inlet. After the engine is started and the oil pressure is established, the oil passes through the main oil channel and enters the tappet chamber from the second oil inlet on the main oil channel to force lubricate the tappet and avoid dry grinding between the tappet and the inner wall of the tappet chamber. When the first oil inlet on the roller tappet moves to the same level as the second oil inlet on the cylinder block, the oil inlet hole on the cylinder block directly sprays oil into the inside of the tappet. After the oil enters the inside of the tappet to lubricate the contact surface between the push rod and the tappet, it flows down from the tappet oil outlet to continue lubricating the roller, the fastening pin and the camshaft surface. The left and right sides of the roller are exposed outside the tappet body. During the movement of the roller, the oil dripping from the oil outlet splashes left and right with the movement of the roller and quickly forms a uniform oil film on the camshaft and other contacting structures. The splashing oil droplets can take away the heat generated by the friction between the parts. The sliding friction is changed into rolling friction, which reduces the wear between parts. A moving guide rail is set to prevent the tappet from rotating during movement. An oil flow channel is set to fully lubricate the moving parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a valve mechanism with a roller tappet provided in an embodiment of the utility model.

[0014] Figure 2 It is a schematic structural view of a roller tappet of a valve train provided in an embodiment of the present utility model.

[0015] Figure 3 It is a sectional view of a roller tappet of a valve train provided in an embodiment of the present utility model.

[0016] Main reference numerals description:

[0017] 1 - roller tappet, 11 - tappet body, 111 - positioning member, 112 - first oil inlet, 113 - oil collecting groove, 114 - oil outlet, 12 - roller, 13 - U-shaped bracket, 131 - vertical wall, 132 - connecting structure, 2 - cylinder block, 21 - tappet chamber, 211 - tappet movement guide rail, 22 - second oil inlet, 3 - camshaft. Specific embodiments

[0018] The following combines with the drawings to describe in detail the specific embodiments of the present utility model, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiments.

[0019] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0020] A valve train with a roller tappet, as Figures 1 to 3 shown, includes: a roller tappet 1, including a tappet body 11, a roller 12, and a U-shaped bracket 13; the tappet body 11 is cylindrical, and a positioning member 111 is provided on the side wall of the tappet body 11; the U-shaped bracket 13 includes two symmetrical vertical walls 131, the U-shaped bracket 13 is located at one end of the tappet body 11, the U-shaped bracket 13 can accommodate the roller 12, and a connecting structure 132 is provided on the two vertical walls 131, and the roller 12 is rotatably fixed on the U-shaped bracket through the connecting structure 132; a cylinder block 2, a tappet chamber 21 is provided in the cylinder block 2, the tappet chamber 21 is used to accommodate the roller tappet 1, and a tappet movement guide rail 211 is provided in the tappet chamber 21, and the tappet movement guide rail 211 can cooperate with the positioning member 111 to prevent the roller tappet 1 from rotating when moving up and down.

[0021] Specifically, when the camshaft 3 moves, rolling friction occurs between the tappet roller 12 and the camshaft 3. Compared with the sliding friction in the traditional solution, it can reduce the contact stress and wear. A tappet movement guide rail 211 is provided in the tappet chamber 21 of the cylinder block 2. Cooperating with the positioning member 111 on the tappet, when the roller tappet 1 makes a piston-like movement in the tappet chamber 21, it will not rotate circumferentially, ensuring that the roller 12 and the camshaft 3 run parallel. The axis of the roller 12 is parallel to the camshaft 3, so that when the roller 12 contacts the cam, the roller 12 can move smoothly under the drive of the cam. The wheel axle of the roller 12 is fixed between the two vertical walls 131 of the U-shaped bracket 13 by the connecting structure 132. Only the top of the roller 12 is wrapped by the U-shaped bracket 13, and the bottom and the left and right sides can directly contact the camshaft 3 or the tappet chamber 21. During the process of the oil dripping downward along the oil outlet 114, as the camshaft 3 continuously moves, the dripping oil droplets are evenly splashed left and right onto the surface of the camshaft 3 and other adjacent structures through the rotating roller 12. The splashed oil droplets can quickly form an oil film on the surface of the camshaft 3, and the oil droplets can also dissipate heat better during the splashing process.

[0022] As an alternative embodiment, a first oil inlet 112 is further provided on the side wall of the tappet body 11, and a second oil inlet 22 corresponding to the first oil inlet 112 is provided in the cylinder block 2. When the first oil inlet 112 moves to be flush with the second oil inlet hole, lubricating oil can directly enter the inside of the roller tappet 1 through the second oil inlet 22 and the first oil inlet 112.

[0023] Specifically, a second oil inlet 22 is provided on the main oil passage of the cylinder block 2. The second oil inlet 22 is matched with the first oil inlet 112 in the circumferential direction, that is, when the tappet piston moves to a certain height, the first oil inlet 112 can be flush with the second oil inlet 22. After the engine starts to build oil pressure, the engine oil passes through the main oil passage and enters the tappet chamber 21 from the oil inlet hole on the main oil passage to perform forced lubrication on the roller tappet 1, avoiding dry friction between the roller tappet 1 and the inner wall of the tappet chamber 21; when the first oil inlet 112 on the tappet moves to be flush with the second oil inlet 22 on the cylinder block 2, the second oil inlet 22 on the cylinder block 2 directly sprays oil into the tappet.

[0024] As an alternative embodiment, an oil collecting groove 113 is provided inside the tappet body 11, and an oil outlet 114 is provided at the bottom of the oil collecting groove 113. One end of the oil outlet 114 is located at the bottom of the oil collecting groove 113, and the other end is located at the top of the roller 12.

[0025] Specifically, after the engine oil enters the interior of the tappet and lubricates the contact surface between the push rod and the tappet, it flows down through the oil outlet 114 hole, continues to lubricate the roller 12, the fastening pin and the surface of the camshaft 3, and the continuously flowing engine oil can take away the heat generated by the mutual contact and friction of the parts.

[0026] As an alternative embodiment, the width of the U-shaped bracket 13 is smaller than the width of the tappet body 11.

[0027] Specifically, after installing the connecting structure 132, the width of the U-shaped bracket 13 is still smaller than that of the tappet body 11. The tappet body 11 is cylindrical, and the positioning member 111 on the tappet body 11 is completely accommodated by the tappet movement guide 211. During the piston movement of the roller tappet 1, the U-shaped bracket 13 with a width smaller than that of the tappet body 11 will not obstruct the movement of the roller tappet 1.

[0028] As an alternative embodiment, the connecting mechanism is a fastening pin, and the two vertical walls 131 of the U-shaped bracket 13 are respectively provided with a first through hole and a second through hole for installing the fastening pin.

[0029] Specifically, the distance between the two vertical walls 131 of the U-shaped bracket 13 matches the width of the roller 12. The fastening pin is coaxial with the axle of the roller 12, and the fastening pin sequentially passes through the first through hole, the roller 12, and the second through hole to fix the roller 12 on the U-shaped bracket 13.

[0030] As an alternative embodiment, the oil outlet 114 is a tapered structure that is wider at the top and narrower at the bottom.

[0031] Specifically, the oil outlet 114 is a tapered structure, which has a larger pressure difference compared with the tubular oil outlet 114 with the same width up and down. When there is not much engine oil left in the oil collecting groove 113, it can also make the engine oil flow smoothly out of the oil collecting groove 113. The tapered structure has a smaller aperture, which can increase the strength of the roller tappet 1.

[0032] As an alternative embodiment, the positioning member 111 is a positioning pin protruding from the tappet body 11, and the tappet movement guide 211 is a linear groove with a width and depth matching that of the positioning pin.

[0033] Specifically, the positioning member 111 protrudes and the tappet movement guide 211 is concave. Since the volume of the tappet body 11 is small and there is a hollow oil collecting groove 113 inside, the outward protruding positioning member 111 can improve the strength of the roller tappet 1 more than the inward concave positioning member 111. Since the length of the tappet chamber 21 is long and the tappet body is small, setting the concave tappet movement guide 211 can save more materials.

[0034] By adopting the above technical solution, the bottom of the tappet is provided with a roller 12. When the camshaft 3 moves, the roller 12 moves accordingly, changing from the sliding friction in the traditional solution to rolling friction, reducing the contact stress and wear. A tappet movement guide rail 211 is provided in the tappet chamber 21 of the cylinder block 2. Cooperating with the positioning member 111 on the roller tappet 1, the roller tappet 1 can be fixed so that it will not rotate circumferentially when moving up and down in the tappet chamber 21, ensuring that the roller 12 and the camshaft 3 run parallel. A first oil inlet 112 is provided on the roller tappet 1, and a corresponding second oil inlet 22 is provided on the main oil passage of the cylinder block 2. After the engine starts and builds up oil pressure, the engine oil passes through the main oil passage and enters the tappet chamber 21 from the second oil inlet 22 on the main oil passage to forcibly lubricate the tappet, avoiding dry grinding between the tappet and the inner wall of the tappet chamber 21; when the first oil inlet 112 on the roller tappet 1 moves to align with the second oil inlet 22 on the cylinder block 2, the oil inlet hole on the cylinder block 2 directly sprays oil into the tappet. After the engine oil enters the tappet and lubricates the contact surface between the push rod and the tappet, it flows down from the oil outlet 114 of the tappet and continues to lubricate the surfaces of the roller 12, the fastening pin and the camshaft 3. The left and right sides of the roller 12 are exposed outside the tappet body 11. During the movement of the roller 12, the engine oil dripping from the oil outlet 114 splashes to the left and right along with the movement of the roller 12 and quickly forms a uniform oil film on the camshaft 3 and other contacting structures. The splashing oil droplets can take away the heat generated by the mutual contact and friction of the parts. Changing from sliding friction to rolling friction reduces the wear between parts. A movement guide rail is provided to prevent the tappet from rotating during movement, and an oil flow channel is provided to fully lubricate the moving parts.

[0035] The foregoing description of specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A valve train with roller tappets, characterized in that, Including: A roller tappet, including a tappet body, a roller, and a U-shaped bracket; the tappet body is cylindrical, and a positioning member is provided on the side wall of the tappet body; the U-shaped bracket includes two symmetric vertical walls, the U-shaped bracket is located at one end of the tappet body, the U-shaped bracket can accommodate the roller, connection structures are provided on the two vertical walls, and the roller is rotatably fixed on the U-shaped bracket through the connection structures; A cylinder block, in which a tappet chamber is provided, the tappet chamber is used to accommodate the roller tappet, and a tappet movement guide rail is provided in the tappet chamber, and the tappet movement guide rail can cooperate with the positioning member to prevent the roller tappet from rotating when moving up and down.

2. The valve train with roller tappets according to claim 1, characterized in that, A first oil inlet is further provided on the side wall of the tappet body, and a second oil inlet corresponding to the first oil inlet is provided in the cylinder block. When the first oil inlet moves to be flush with the second oil hole, lubricating oil can directly enter the inside of the roller tappet through the second oil inlet and the first oil inlet.

3. The valve train with roller tappets as claimed in claim 1, characterized in that, An oil sump is provided inside the tappet body, an oil outlet is provided at the bottom of the oil sump, one end of the oil outlet is located at the bottom of the oil sump, and the other end is located at the top of the roller.

4. The valve train with a roller tappet according to claim 1, characterized in that, The width of the U-shaped bracket is smaller than the width of the tappet body.

5. The valve train with roller tappets according to claim 1, characterized in that, The connection mechanism is a fastening pin, and the two vertical walls of the U-shaped bracket are respectively provided with a first through hole and a second through hole for installing the fastening pin.

6. The valve train with roller tappets according to claim 3, characterized in that, The oil outlet is a tapered structure that is thick at the top and thin at the bottom.

7. The valve train with roller tappets according to claim 1, characterized in that, The positioning member is a positioning pin protruding from the tappet body, and the tappet movement guide rail is a linear groove with a width and depth matching the positioning pin.

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