Engine valve tappet layout structure

Abstract

The utility model relates to the technical field of engines, in particular to an engine valve tappet layout structure which comprises a cam shaft arranged in an engine box body, tappets are arranged on the engine box body and correspond to two valve cams arranged on the cam shaft in pairs, the upper ends of the tappets are used for being connected with valve push rods, and the lower ends of the tappets are used for being connected with valve push rods. The upper ends of the valve push rods extend upwards and are arranged on a cylinder cover above an engine cylinder head; an oil pump is arranged on the engine box body and corresponds to a pressure supply cam arranged on the cam shaft, and the pressure supply cam is matched with the pressure supply end of the oil pump. The paired two valve cams are arranged at one end of the cam shaft, and the pressure supply cam is arranged at the other end of the cam shaft. The utility model has the characteristics that the structural design is simpler and more reasonable, the layout is more compact, and the working reliability can be improved.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an engine valve tappet layout structure. Background Technology

[0002] The engine block includes a housing with a cover, and the housing also forms the cylinder head, on which the cylinder head is mounted. The housing also houses assemblies such as the fuel tank, air filter, and muffler.

[0003] like Figures 1 to 3 The diagram shows an existing engine structure. A camshaft is housed within the engine housing. Cams on the camshaft, corresponding to the intake valve tappets 1 and 2 respectively, drive the intake and exhaust valve tappets. In this layout, an oil pump 3 is installed on the engine housing, positioned between the moving intake and exhaust valve tappets. The oil pump engages with the cams on the camshaft and provides pressure to the pump. This layout results in a large distance between the intake and exhaust valve tappets, leading to a large distance between the corresponding intake valve pushrods 4 and 5 connected to them. The upper ends of the intake and exhaust valve pushrods are mounted on the cylinder head. To make the cylinder head structure more compact, existing structures typically arrange the upper ends of the intake and exhaust valve pushrods at an angle to reduce the distance between their upper ends. However, this structural design is not reasonable enough, which reduces the reliability of the intake valve pushrod and exhaust valve pushrod, and reduces the reliability of the cooperation between the intake valve tappet and exhaust valve tappet and the cam.

[0004] Therefore, how to design an engine valve tappet layout structure that is simpler and more reasonable in structure, more compact in layout, and can improve operational reliability has become a technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is how to design an engine valve tappet layout structure with a simpler and more reasonable structure, a more compact layout, and improved working reliability.

[0006] To achieve the above objectives, this utility model provides an engine valve tappet layout structure, including a camshaft installed in the engine housing, two valve cams arranged in pairs on the engine housing and corresponding to the camshaft, each equipped with a tappet, the upper end of which is connected to a valve pushrod, and the upper ends of the valve pushrods extend upward and are installed on the cylinder head above the engine cylinder head; an oil pump is provided on a pressure supply cam on the engine housing and corresponding to the camshaft, and the pressure supply cam cooperates with the pressure supply end of the oil pump; the characteristic feature is that the two valve cams are arranged at one end of the camshaft, and the pressure supply cam is arranged at the other end of the camshaft.

[0007] In this structure, by placing the paired valve cams at one end of the camshaft and the pressure supply cam at the other end, the two tappets are positioned at one end of the camshaft, and the oil pump at the other end. This reduces the distance between the two tappets, which in turn reduces the distance between the two valve pushrods connected to them. This allows the valve pushrods to maintain a more vertical arrangement. Compared to the original structure where the upper ends of the valve pushrods are tilted inwards, changing the arrangement of the oil pump and the two tappets allows for a more compact tappet layout, better cooperation with the valve pushrods, and thus improved operational reliability.

[0008] As an optimization, the engine also includes a cover mounted on the open end of the housing, such that a pair of valve cams are positioned on the camshaft away from the cover; and a pressure supply cam is positioned on the camshaft adjacent to the cover.

[0009] This makes the position of the pressure supply cam and the two valve cams on the camshaft more reasonable.

[0010] As an optimization, the tappets include an intake valve tappet and an exhaust valve tappet; an intake valve push rod is connected to the intake valve tappet, and an exhaust valve push rod is connected to the exhaust valve tappet.

[0011] This design, with intake and exhaust valve tappets, and corresponding intake and exhaust valve pushrods, is more rational.

[0012] As an optimization, the upper end face of the tappet is provided with a concave mating spherical surface, and the lower end of the valve push rod is provided with a mating ball head, such that the mating ball head is mated within the mating spherical surface.

[0013] This makes the coordination between the tappet and the valve pushrod more reasonable.

[0014] As an optimization, a cylinder head cover is provided on the cylinder head that can be detachably connected.

[0015] In this way, installing a cylinder head cover on the cylinder head can protect the internal structure of the cylinder head.

[0016] As an optimization, each valve pushrod has a clearance hole on the housing for the upper end of the valve pushrod to pass through to the top of the housing; each valve pushrod has a mounting hole on the cylinder head for the valve pushrod to pass through the mounting hole and extend into the cylinder head; each valve pushrod is fitted with a tubular guide sleeve, with the upper end of the guide sleeve connected to the cylinder head and the lower end of the guide sleeve connected to the housing.

[0017] In this way, by setting a guide sleeve to protect the valve pushrod, the overall structural design is simpler and more reasonable than the original structure which sets a channel on the cylinder head. It also makes the cylinder head structure more compact, easier to process and manufacture, and reduces costs.

[0018] As an optimization, an installation protrusion is integrally formed on the cylinder block at a position opposite to the lower end of the guide sleeve, and the aforementioned clearance hole is provided on the installation protrusion.

[0019] In this way, by setting the mounting protrusion, the structural strength of this part can be improved, and the axial dimension of the relief hole can be made larger, making it easier to install the conduit sleeve.

[0020] Furthermore, the lower end of the mounting hole has an annular upper mounting step surface on its inner peripheral wall, and the upper end of the positioning hole has an annular lower mounting step surface on its inner peripheral wall; and the upper and lower ends of the guide sleeve are respectively abutted against the upper mounting step surface and the lower mounting step surface.

[0021] This makes it easier to install the catheter sleeve, and the installation is more stable and reliable.

[0022] Furthermore, an upper mating flange and a lower mating flange with annular structures are respectively provided on the outer peripheral walls of the upper and lower ends of the conduit sleeve; and the upper mating flange and the lower mating flange can respectively abut against the inner peripheral wall of the lower end of the mounting hole and the inner peripheral wall of the upper end of the clearance hole.

[0023] This makes the catheter sleeve's structural design more reasonable, allowing for better assembly.

[0024] Furthermore, a protective cover is installed on the outside of the guide sleeve, and the protective cover is attached to the cylinder head by screws.

[0025] In this way, by setting a protective shell to shield and protect the conduit sleeve, the structural design becomes simpler and more reasonable.

[0026] In summary, the above structure, by changing the layout of the tappet and oil pump, has the characteristics of simpler and more reasonable structural design, more compact layout, and improved operational reliability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the existing engine mechanism structure.

[0028] Figure 2 yes Figure 1 A structural diagram omitting the box section.

[0029] Figure 3 yes Figure 2 A magnified view of position A in the diagram.

[0030] Figure 4 This is a schematic diagram of the engine in a specific embodiment of this utility model.

[0031] Figure 5 yes Figure 4 A schematic diagram of the structure after rotation by one angle.

[0032] Figure 6 yes Figure 5 A schematic diagram of the structure without the protective casing.

[0033] Figure 7 yes Figure 6 A structural diagram omitting the box section.

[0034] Figure 8 yes Figure 7 A magnified view of position B in the diagram. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] like Figures 4 to 8As shown, an engine valve tappet layout structure includes a camshaft 11 installed in an engine housing 10. Two valve cams 12 arranged in pairs on the engine housing and corresponding to the camshaft are each provided with a tappet 13. The upper end of the tappet is used to connect to a valve pushrod 14, and the upper end of each valve pushrod extends upward and is installed on the cylinder head 16 above the engine cylinder head 15. An oil pump 18 is provided on a pressure supply cam 17 on the engine housing and corresponding to the camshaft, and the pressure supply cam cooperates with the pressure supply end of the oil pump. The two valve cams are arranged at one end of the camshaft, and the pressure supply cam is arranged at the other end of the camshaft.

[0037] In this structure, by placing the paired valve cams at one end of the camshaft and the pressure supply cam at the other end, the two tappets are positioned at one end of the camshaft, and the oil pump at the other end. This reduces the distance between the two tappets, which in turn reduces the distance between the two valve pushrods connected to them. This allows the valve pushrods to maintain a more vertical arrangement. Compared to the original structure where the upper ends of the valve pushrods are tilted inwards, changing the arrangement of the oil pump and the two tappets allows for a more compact tappet layout, better cooperation with the valve pushrods, and thus improved operational reliability.

[0038] In this specific embodiment, the engine also includes a cover 19 mounted on the open end of the housing, such that a pair of valve cams are arranged on the camshaft at a position away from the cover; the pressure supply cam is arranged on the camshaft at a position adjacent to the cover.

[0039] This makes the position of the pressure supply cam and the two valve cams on the camshaft more reasonable.

[0040] In this specific embodiment, the tappets include an intake valve tappet and an exhaust valve tappet; an intake valve push rod is connected to the intake valve tappet, and an exhaust valve push rod is connected to the exhaust valve tappet.

[0041] This design, with intake and exhaust valve tappets, and corresponding intake and exhaust valve pushrods, is more rational.

[0042] In this specific embodiment, a recessed mating spherical surface is provided on the upper end face of the tappet, and a mating ball head is provided on the lower end of the valve push rod, such that the mating ball head is mated within the mating spherical surface.

[0043] This makes the coordination between the tappet and the valve pushrod more reasonable.

[0044] In this specific embodiment, a cylinder head cover 20 is detachably connected to the cylinder head.

[0045] In this way, installing a cylinder head cover on the cylinder head can protect the internal structure of the cylinder head.

[0046] In this specific embodiment, a clearance hole is provided on the housing for each corresponding valve push rod to allow the upper end of the valve push rod to pass through to the top of the housing; a mounting hole is provided on the cylinder head for each corresponding valve push rod, so that each valve push rod passes through the mounting hole and extends into the cylinder head; a tubular guide sleeve 21 is sleeved on the outside of each valve push rod, so that the upper end of the guide sleeve is connected to the cylinder head and the lower end of the guide sleeve is connected to the housing.

[0047] In this way, by setting a guide sleeve to protect the valve pushrod, the overall structural design is simpler and more reasonable than the original structure which sets a channel on the cylinder head. It also makes the cylinder head structure more compact, easier to process and manufacture, and reduces costs.

[0048] In this specific embodiment, an mounting protrusion 22 is integrally formed on the cylinder body at a position opposite to the lower end of the guide sleeve, and the clearance hole is provided on the mounting protrusion.

[0049] In this way, by setting the mounting protrusion, the structural strength of this part can be improved, and the axial dimension of the relief hole can be made larger, making it easier to install the conduit sleeve.

[0050] Furthermore, the lower end of the mounting hole has an annular upper mounting step surface on its inner peripheral wall, and the upper end of the positioning hole has an annular lower mounting step surface on its inner peripheral wall; and the upper and lower ends of the guide sleeve are respectively abutted against the upper mounting step surface and the lower mounting step surface.

[0051] This makes it easier to install the catheter sleeve, and the installation is more stable and reliable.

[0052] Furthermore, an upper mating flange and a lower mating flange 23 with annular structures are respectively provided on the outer peripheral walls of the upper and lower ends of the conduit sleeve; and the upper mating flange and the lower mating flange can respectively abut against the inner peripheral wall of the lower end of the mounting hole and the inner peripheral wall of the upper end of the clearance hole.

[0053] This makes the catheter sleeve's structural design more reasonable, allowing for better assembly.

[0054] Furthermore, a protective cover 24 is installed on the outside of the guide sleeve, and the protective cover is attached to the cylinder head by screws.

[0055] In this way, by setting a protective shell to shield and protect the conduit sleeve, the structural design becomes simpler and more reasonable.

[0056] In summary, the above structure, by changing the layout of the tappet and oil pump, has the characteristics of simpler and more reasonable structural design, more compact layout, and improved operational reliability.

[0057] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An engine valve tappet layout structure, comprising a camshaft mounted in an engine housing, two valve cams arranged in pairs on the engine housing and corresponding to the camshaft, each equipped with a tappet, the upper end of the tappet being connected to a valve pushrod, and the upper ends of the valve pushrods extending upwards and mounted on the cylinder head above the engine cylinder head; an oil pump is provided on a pressure supply cam on the engine housing and corresponding to the camshaft, and the pressure supply cam cooperates with the pressure supply end of the oil pump; characterized in that... ; the pair of two valve cams are arranged at one end position of the cam shaft, and the pressure supply cam is arranged at the other end position of the cam shaft.

2. An engine valve lifter arrangement as claimed in claim 1, wherein; The engine further comprises a cover arranged at the open end of the box, and the pair of two valve cams are arranged at a position on the cam shaft away from the cover; the pressure supply cam is correspondingly arranged at a position on the cam shaft adjacent to the cover.

3. An engine valve lifter arrangement as claimed in claim 1, wherein: The tappet comprises an intake valve tappet and an exhaust valve tappet; an intake valve push rod is connected to the intake valve tappet, and an exhaust valve push rod is connected to the exhaust valve tappet.

4. An engine valve lifter arrangement as claimed in claim 1, wherein; A concave matching spherical surface is arranged on the upper end surface of the tappet, and a matching spherical head is arranged at the lower end of the valve push rod, and the matching spherical head is arranged in the matching spherical surface.

5. An engine valve lifter arrangement as claimed in claim 1, wherein; A cylinder head cover is detachably connected to the cylinder head.

6. An engine valve lifter arrangement as claimed in claim 1 wherein; Respective accommodation holes are arranged on the box and correspond to the valve push rods, and are used for the upper ends of the valve push rods to pass out of the box; respective mounting holes are arranged on the cylinder head and correspond to the valve push rods, and the valve push rods pass through the mounting holes and extend into the cylinder head; respective pipes are arranged on the outer sides of the valve push rods, and the pipes are designed in a tubular structure, and the upper ends of the pipes are connected to the cylinder head, and the lower ends of the pipes are connected to the box.

7. An engine valve lifter arrangement as claimed in claim 6 wherein; An installation protrusion is integrally formed on the cylinder body at a position opposite to the lower end of the pipe, and the accommodation hole is arranged on the installation protrusion.

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