Engine structure and vehicle

Abstract

The utility model provides an engine structure and a vehicle, and the engine structure comprises a rocker arm shaft, a rocker arm and a limiting block, a cam assembly; the cylinder cover comprises a columnar shell with an installation opening, the rocker arm shaft penetrates through the cylinder cover, and a part of the rocker arm shaft is exposed out of the installation opening and arranged on the cylinder cover; the air valve assembly is arranged between the engine air port and the rocker arm assembly; the rocker arm and the limiting block respectively sleeve the part, exposed out of the mounting port, of the rocker arm shaft; the cylinder covers on two opposite sides of the mounting port limit the axial movement of the rocker arm and the limiting block on the rocker arm shaft; the cam assembly is parallel to the rocker arm shaft. In the engine structure, the cam assembly is installed in place before the rocker arm, after the cam assembly is installed in place, the cam assembly is in a second state away from the rocker arm, after the rocker arm is moved in place, the limiting block is installed in place, then the cam assembly is in the state of extruding the rocker arm, and the situation that the cam assembly has a play space in the axial direction of the cam shaft is avoided. And under the action of axial force between a peach tip of a certain cam and an air valve, the condition that the cam shaft is inclined is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to an engine structure and a vehicle. Background Art

[0002] During the installation of the engine, the gap between the camshaft lobe and the end of the valve stem is very small. When installing the camshaft, the camshaft lobe of a certain cylinder will press against the rocker arm, and the rocker arm will press against the valve. The valve spring applies a reverse elastic force, causing the camshaft to be subjected to a vertical upward reaction force. At the same time, since the camshaft has axial movement space, if the camshaft is affected by the axial force between the cam lobe of a certain cylinder and the valve, it will cause the camshaft to tilt during installation. Subsequently, the camshaft and the cylinder head thrust surface will wear, resulting in damage to the camshaft thrust surface or the cylinder head thrust surface. Utility Model Content

[0003] The utility model aims to provide an engine structure and a vehicle, which are used to solve the problem in the prior art that, during the installation of the engine, the camshaft has axial movement space, so if the camshaft is acted upon by the axial force between a cam lobe and a valve, the camshaft may tilt during installation.

[0004] In order to solve the above technical problems, the present utility model provides an engine structure, which includes:

[0005] A rocker arm assembly, comprising a rocker arm shaft, a rocker arm and a limit block;

[0006] Cam assembly;

[0007] The cylinder head comprises a columnar housing with a mounting opening, the rocker arm shaft passes through the cylinder head and is partially exposed at the mounting opening; the cam assembly is arranged on the cylinder head;

[0008] A valve assembly, disposed between the engine air port and the rocker arm assembly;

[0009] Wherein, the rocker arm and the limit block are respectively sleeved on the exposed portion of the rocker arm shaft at the mounting opening, and the cylinder heads on opposite sides of the mounting opening limit the axial movement of the rocker arm and the limit block in the rocker arm shaft; the cam assembly is arranged parallel to the rocker arm shaft;

[0010] The valve assembly is in contact with the rocker arm, and the cam assembly includes a first state and a second state during rotation; in the first state, the cam assembly squeezes the rocker arm, the rocker arm squeezes the valve assembly, and the valve assembly opens the engine air port; in the second state, the cam assembly is away from the rocker arm, the rocker arm is away from the valve assembly, and the valve assembly closes the engine air port.

[0011] Optionally, in the engine structure, the valve assembly includes a valve, which is arranged at the engine air port; in the first state, the valve is away from the engine air port; in the second state, the valve covers the engine air port.

[0012] Optionally, in the engine structure, the valve assembly further comprises a clearance adjustment head, a valve spring seat and a valve spring;

[0013] Among them, the valve spring is sleeved with the valve, one end of which is connected to the valve spring seat, and the other end is connected to the engine air port; the clearance adjustment head is arranged on the side of the valve spring seat away from the spring, and the rocker arm is squeezed by the cam assembly to squeeze the clearance adjustment head, driving the valve spring seat to move toward the engine air port, and the valve spring contracts.

[0014] Optionally, in the engine structure, the cam assembly comprises a cam and a camshaft; the camshaft is rotatably connected to the cylinder head, and the cam is fixed to the camshaft; the cam and the rocker arm are coaxial with respect to the orthographic projection of the rocker arm shaft;

[0015] Wherein, in the first state, the lobe of the cam squeezes the rocker arm; in the second state, the lobe is away from the rocker arm.

[0016] Optionally, in the engine structure, the axial distance of the portion of the rocker arm shaft exposed at the mounting opening is greater than or equal to twice the size of the orthographic projection of the rocker arm on the axis of the rocker arm shaft, and the sum of the sizes of the limit block and the orthographic projection of the rocker arm on the axis of the rocker arm shaft is equal to the axial distance of the portion of the rocker arm shaft exposed at the mounting opening.

[0017] Optionally, in the engine structure, the size of the orthographic projection of the cam in the cam assembly on the axis of the rocker shaft is equal to that of the rocker arm.

[0018] In order to achieve the above-mentioned object, an embodiment of the utility model further provides a vehicle, wherein the vehicle includes the engine structure as described above.

[0019] The beneficial effects of the above technical solution of the utility model are as follows:

[0020] In the above scheme, a limit block is provided on the rocker arm shaft in the engine structure to limit the movement of the rocker arm on the rocker arm shaft, so that the cam assembly is installed in place before the rocker arm during installation. When the cam assembly is installed in place, it is placed in a second state away from the rocker arm. After the rocker arm is moved into place, the limit block is installed in place, and then the cam assembly is placed in a state of squeezing the rocker arm. The camshaft will not tilt under the action of the axial force between a certain cam lobe and the valve due to the axial movement space of the camshaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the schematic diagrams of the engine structure described in the embodiment of the utility model;

[0022] Figure 2 This is a second schematic diagram of the engine structure described in an embodiment of the utility model;

[0023] Figure 3 This is a third schematic diagram of the engine structure described in an embodiment of the utility model;

[0024] Figure 4 This is the fourth schematic diagram of the engine structure described in the embodiment of the utility model.

[0025] Explanation of symbols:

[0026] 100- rocker arm assembly; 110- rocker arm shaft; 120- rocker arm; 130- limit block; 200- cam assembly; 210- camshaft; 220- cam; 300- cylinder head; 400- valve assembly; 410- valve; 420- clearance adjustment head; 430- valve spring seat; 440- valve spring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model provides an engine structure and a vehicle to solve the problem that in the prior art, since there is axial movement space of the camshaft during engine installation, if the camshaft is acted upon by an axial force between a cam lobe and a valve, the camshaft may tilt during installation.

[0029] like Figure 3 As shown, the embodiment of the utility model provides an engine structure, which includes:

[0030] The rocker arm assembly 100 includes a rocker arm shaft 110, a rocker arm 120 and a limit block 130;

[0031] Cam assembly 200;

[0032] The cylinder head 300 includes a columnar housing with a mounting opening, the rocker arm shaft 110 passes through the cylinder head 300 and is partially exposed at the mounting opening; the cam assembly 200 is disposed on the cylinder head 300;

[0033] The valve assembly 400 is disposed between the engine air port and the rocker arm assembly 100;

[0034] The rocker arm 120 and the stopper 130 are respectively sleeved on the exposed portion of the rocker arm shaft 110 at the installation opening, and the cylinder heads 300 on opposite sides of the installation opening limit the axial movement of the rocker arm 120 and the stopper 130 in the rocker arm shaft 110; the cam assembly 200 is arranged parallel to the rocker arm shaft 110;

[0035] The valve assembly 400 is in contact with and connected to the rocker arm 120, and the cam assembly 200 includes a first state and a second state during rotation; in the first state, the cam assembly 200 squeezes the rocker arm 120, the rocker arm 120 squeezes the valve assembly 400, and the valve assembly 400 opens the engine air port; in the second state, the cam assembly 200 is away from the rocker arm 120, the rocker arm 120 is away from the valve assembly 400, and the valve assembly 400 closes the engine air port.

[0036] In this embodiment, the limit block 130 is arranged on the rocker arm shaft 110 in the engine structure to limit the movement of the rocker arm 120 on the rocker arm shaft 110, so that the cam assembly 200 is installed in place before the rocker arm 120 during installation. When the cam assembly 200 is installed in place, it is placed in a second state away from the rocker arm 120. After the rocker arm 120 is moved in place, the limit block 130 is installed in place. Then, the cam assembly 200 is placed in a state of squeezing the rocker arm 120. The camshaft will not tilt due to the axial movement space of the camshaft under the action of the axial force between a cam lobe and the valve. In addition, the side where the limit block 130 is installed with the rocker arm shaft 110 adopts a C-shaped side design, which is convenient for installing the limit block 130 after the rocker arm shaft 110 is installed.

[0037] Optionally, in the engine structure, the valve assembly 400 includes a valve 410, which is arranged at the engine air port; in the first state, the valve 410 is away from the engine air port; in the second state, the valve 410 covers the engine air port.

[0038] In this embodiment, the opening and closing of the engine air port is realized by switching the valve 410 between the first state and the second state, thereby achieving the purpose of air intake, exhaust and closing.

[0039] Optionally, in the engine structure, the valve assembly 400 further includes a clearance adjustment head 420, a valve spring seat 430 and a valve spring 440;

[0040] Among them, the valve spring 440 is sleeved on the valve 410, one end of which is connected to the valve spring seat 430, and the other end is connected to the engine air port; the clearance adjustment head 420 is arranged on the side of the valve spring seat 430 away from the spring, and the rocker arm 120 is squeezed by the cam assembly 200 to squeeze the clearance adjustment head 420, driving the valve spring seat 430 to move toward the direction of the engine air port, and the valve spring 440 contracts.

[0041] In this embodiment, if Figure 4 As shown, when the cam assembly 200 squeezes the rocker arm 120, the rocker arm 120 squeezes the clearance adjustment head 420 on the valve spring seat 430, so that the valve spring 440 is squeezed. Since the valve spring 440 is sleeved on the valve 410, one end is connected to the valve spring seat 430, and the other end is connected to the engine air port, the valve spring 440 is pressed against the engine air port and compressed, so that the valve 410 extends into the interior of the engine, thereby away from the engine air port, and the engine can take in and out air.

[0042] Optionally, in the engine structure, the cam assembly 200 includes a cam 220 and a camshaft 210; the camshaft 210 is rotatably connected to the cylinder head 300, and the cam 220 is fixed to the camshaft 210; the cam 220 and the rocker arm 120 are coaxial with the orthographic projection of the rocker arm shaft 110;

[0043] In the first state, the lobe of the cam 220 presses the rocker arm 120 ; in the second state, the lobe is away from the rocker arm 120 .

[0044] In this embodiment, when the camshaft 210 is installed on the cylinder head 300, the camshaft 210 is locked at the cylinder top dead center position according to the timing phase design requirements. For the part where the lobe tip of the cam 220 and the clearance adjustment head 420 are subjected to force, the rocker arm 120 is moved axially along the rocker arm shaft 110 for a distance so that the gap between the lobe tip of the cam 220 and the clearance adjustment head 420 is maintained, and the gap is in a state as shown in FIG. Figure 1 and Figure 2The state shown. After that, the camshaft 210 is installed. Since there is no contact between the rocker arm 120 and the valve assembly 400, the camshaft 210 will not be subjected to the contact force transmitted from the valve 410 to the rocker arm 120. Therefore, it can be ensured that the cylinder head 300 (or cam bearing cover) thrust will not be damaged during installation, thereby effectively ensuring the assembly quality of the engine. After the camshaft 210 is installed, since there are multiple cams 220, each of the cams 220 rotates the direction of the camshaft 210 so that the corresponding lobe is away from the position of the valve assembly 400, and the rocker arm 120 is moved to a position coaxial with the positive projection of the cam 220 on the rocker arm shaft 110, and the position of the rocker arm 120 is limited by the limit block 130, so as to achieve the following. Figure 3 and Figure 4 The state shown prevents the rocker arm 120 from being deviated from the designed position due to pressure, thereby ensuring functional requirements.

[0045] Optionally, in the engine structure, the axial distance of the portion of the rocker arm shaft 110 exposed at the mounting opening is greater than or equal to twice the size of the orthographic projection of the rocker arm 120 on the axis of the rocker arm shaft 110, and the sum of the sizes of the limit block 130 and the orthographic projection of the rocker arm 120 on the axis of the rocker arm shaft 110 is equal to the axial distance of the portion of the rocker arm shaft 110 exposed at the mounting opening.

[0046] In this embodiment, before and after the cam assembly 200 is installed, the rocker arm 120 changes from a position where the orthographic projection on the rocker shaft 110 is completely non-coincident with the orthographic projection of the cam 220 on the rocker shaft 110 to a position where it is coaxial with the orthographic projection of the cam 220 on the rocker shaft 110. This requires that the rocker shaft 110 has a movable portion that is greater than or equal to twice the size of the orthographic projection of the rocker arm 120 on the axis of the rocker shaft 110. In addition, in order to ensure that the limit block 130 can abut between the rocker arm 120 and one side of the mounting opening of the cylinder head 300, the sum of the sizes of the orthographic projections of the limit block 130 and the rocker arm 120 on the axis of the rocker shaft 110 needs to be equal to the axial distance of the portion of the rocker shaft 110 exposed at the mounting opening.

[0047] Optionally, in the engine structure, the size of the orthographic projection of the cam 220 in the cam assembly 200 on the axis of the rocker shaft 110 is equal to that of the rocker arm 120 .

[0048] In this embodiment, if Figure 3 and Figure 4As shown, in order to ensure that the structure of the cam 220 and the rocker arm 120 is stable and the force is balanced when they are squeezed, the cam 220 and the rocker arm 120 are coaxial in their orthographic projections on the axis of the rocker arm shaft 110. In order to facilitate the axial movement of the rocker arm 120 on the rocker arm shaft 110 from a state completely separated from the cam 220 to a state directly facing the cam 220, the size of the orthographic projection of the cam 220 on the axis of the rocker arm shaft 110 is set to be equal to that of the rocker arm 120.

[0049] In order to achieve the above-mentioned object, an embodiment of the utility model further provides a vehicle, wherein the vehicle includes the engine structure as described above.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An engine structure, characterized in that: include: A rocker arm assembly (100) comprises a rocker arm shaft (110), a rocker arm (120) and a limit block (130); Cam assembly (200); The cylinder head (300) comprises a columnar housing with a mounting opening, the rocker arm shaft (110) passes through the cylinder head (300) and is partially exposed at the mounting opening; the cam assembly (200) is arranged on the cylinder head (300); A valve assembly (400) is arranged between the engine air port and the rocker arm assembly (100); The rocker arm (120) and the limit block (130) are respectively sleeved on the exposed portion of the rocker arm shaft (110) at the mounting opening, and the cylinder cover (300) on opposite sides of the mounting opening limits the axial movement of the rocker arm (120) and the limit block (130) on the rocker arm shaft (110); the cam assembly (200) is arranged parallel to the rocker arm shaft (110); The valve assembly (400) is in contact with and connected to the rocker arm (120), and the cam assembly (200) includes a first state and a second state during its rotation; in the first state, the cam assembly (200) squeezes the rocker arm (120), the rocker arm (120) squeezes the valve assembly (400), and the valve assembly (400) opens the engine air port; in the second state, the cam assembly (200) is away from the rocker arm (120), the rocker arm (120) is away from the valve assembly (400), and the valve assembly (400) closes the engine air port.

2. The engine structure according to claim 1, characterized in that: The valve assembly (400) comprises a valve (410) arranged at the engine air port; in the first state, the valve (410) is away from the engine air port; in the second state, the valve (410) covers the engine air port.

3. The engine structure according to claim 2, characterized in that: The valve assembly (400) further comprises a clearance adjustment head (420), a valve spring seat (430) and a valve spring (440); The valve spring (440) is sleeved on the valve (410), one end of which is connected to the valve spring seat (430) and the other end of which is connected to the engine air port; the clearance adjustment head (420) is arranged on a side of the valve spring seat (430) away from the spring, and the rocker arm (120) is squeezed by the cam assembly (200) to squeeze the clearance adjustment head (420), thereby driving the valve spring seat (430) to move toward the engine air port, and the valve spring (440) contracts.

4. The engine structure according to claim 1, characterized in that: The cam assembly (200) comprises a cam (220) and a camshaft (210); the camshaft (210) is rotatably connected to the cylinder head (300), and the cam (220) is fixed to the camshaft (210); the cam (220) and the rocker arm (120) are coaxial in their orthographic projection on the rocker arm shaft (110); Wherein, in the first state, the lobe tip of the cam (220) presses the rocker arm (120); and in the second state, the lobe tip is away from the rocker arm (120).

5. The engine structure according to claim 1, characterized in that: The axial distance of the portion of the rocker arm shaft (110) exposed at the installation opening is greater than or equal to twice the size of the orthographic projection of the rocker arm (120) on the axis of the rocker arm shaft (110), and the sum of the sizes of the limit block (130) and the orthographic projection of the rocker arm (120) on the axis of the rocker arm shaft (110) is equal to the axial distance of the portion of the rocker arm shaft (110) exposed at the installation opening.

6. The engine structure according to claim 4 or 5, characterized in that: The size of the orthographic projection of the cam (220) in the cam assembly (200) on the axis of the rocker arm shaft (110) is equal to that of the rocker arm (120).

7. A vehicle, characterized in that: The vehicle comprises the engine structure according to any one of claims 1-6.

Images