Intake Camshaft and Active Prechamber Engine

Abstract

The present invention belongs to the technical field of engines, and discloses an intake camshaft and a pre-chamber engine with active pre-chamber. The intake camshaft includes a camshaft body, a shaft head end piece, at least one set of valve drive assemblies, a first high-pressure oil pump cam, and a second high-pressure oil pump cam. The shaft head end piece is connected to the end of the camshaft body, and the shaft head end piece is configured to connect to a sprocket; the valve drive assembly is sleeved outside the camshaft body; the first high-pressure oil pump cam and the second high-pressure oil pump cam are arranged at intervals along the axis direction of the camshaft body on the camshaft body, and the first high-pressure oil pump cam and the second high-pressure oil pump cam are respectively configured to drive two high-pressure oil pumps. The intake camshaft can drive two high-pressure oil pumps simultaneously, with a simple structure, effectively reducing the complexity of the engine structure and the overall width of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an intake camshaft and a pre-chamber engine with active pre-chamber. Background Art

[0002] The gasoline direct injection engine is the mainstream engine for fuel vehicles, which is equipped with a high-pressure oil pump to inject gasoline into the cylinder in a high-pressure form for combustion. In order to control the emissions and fuel consumption of fuel vehicles and further reduce the emission and fuel consumption levels of gasoline engines, the pre-chamber engine with active pre-chamber is widely used.

[0003] The pre-chamber engine with active pre-chamber consists of two parts: a pre-chamber and a main combustion chamber, which are connected by one or more holes. The pre-chamber is located in the cylinder head and accounts for 25%-40% of the compression volume. This pre-chamber engine with active pre-chamber is equipped with two high-pressure oil pumps, while the current gasoline direct injection engine is only equipped with one high-pressure oil pump. Generally, the high-pressure oil pump is driven by a camshaft, a balance shaft or an independent shaft, and there is a high-pressure oil pump cam on the above-mentioned drive shafts to drive the high-pressure oil pump.

[0004] In the prior art, only one high-pressure oil pump cam is provided on the drive shaft, that is, only one high-pressure oil pump can be driven, which is not suitable for the working condition of driving two high-pressure oil pumps simultaneously in the pre-chamber engine with active pre-chamber. However, in the pre-chamber engine with active pre-chamber, if only one high-pressure oil pump is driven, the flammability risk of the high-pressure oil pump when it is exposed to heat radiation will be increased.

[0005] Therefore, there is an urgent need for an intake camshaft and a pre-chamber engine with active pre-chamber to solve the above problems. Summary of the Invention

[0006] According to one aspect of the present invention, an object is to provide an intake camshaft that can drive two high-pressure oil pumps simultaneously, has a simple structure, and effectively reduces the complexity of the engine structure and the overall width of the engine.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The intake camshaft includes: a camshaft body, a shaft head end piece, at least one set of valve drive components, a first high-pressure oil pump cam and a second high-pressure oil pump cam; the shaft head end piece is connected to the end of the camshaft body, and the shaft head end piece is configured to connect a sprocket; the valve drive components are sleeved outside the camshaft body; the first high-pressure oil pump cam and the second high-pressure oil pump cam are arranged at intervals along the axis of the camshaft body on the camshaft body, and the first high-pressure oil pump cam and the second high-pressure oil pump cam are respectively configured to drive two high-pressure oil pumps.

[0009] As a preferred solution of the intake camshaft provided by the present invention, the second high-pressure oil pump cam is arranged at the end of the camshaft body away from the shaft head end piece. When the valve drive assembly is a group, the first high-pressure oil pump cam and the valve drive assembly are arranged at intervals; when the valve drive assembly is more than one group, the first high-pressure oil pump cam is arranged between two adjacent valve drive assemblies.

[0010] As a preferred embodiment of the intake camshaft provided by the present invention, the intake camshaft further includes a signal wheel, which is sleeved on the outside of the camshaft body, arranged adjacent to the second high-pressure oil pump cam, and sandwiched between one of the valve drive components and the second high-pressure oil pump cam.

[0011] As a preferred solution of the intake camshaft provided by the present invention, the shaft head end piece includes a connecting shaft segment, and the connecting shaft segment is configured to be connected to the sprocket.

[0012] As a preferred solution of the intake camshaft provided by the present invention, the shaft head end piece also includes a first stop shaft segment and a second stop shaft segment, the connecting shaft segment is fixedly connected to the first stop shaft segment, the first stop shaft segment and the second stop shaft segment are spaced apart and connected by the connecting segment, and the diameters of the first stop shaft segment and the second stop shaft segment are both larger than the diameter of the camshaft body.

[0013] As a preferred solution of the intake camshaft provided by the present invention, the cross-sectional shape of the second stop shaft segment can indicate the installation direction of the camshaft body.

[0014] As a preferred solution of the intake camshaft provided by the present invention, an annular groove is provided in the connecting section between the first stop shaft segment and the second stop shaft segment, a radial oil channel is provided at the bottom of the annular groove, and the radial oil channel is configured to provide engine oil to the timing mechanism.

[0015] As a preferred solution of the intake camshaft provided by the present invention, the valve drive assembly includes two intake cams, and the two intake cams are axially spaced apart and arranged on the camshaft body.

[0016] As a preferred solution of the intake camshaft provided by the present invention, the valve drive assemblies are in four groups, and the four groups of valve drive assemblies are axially spaced apart and arranged on the camshaft body.

[0017] As a preferred solution of the intake camshaft provided by the present invention, the shaft head end piece, the valve drive assembly, the first high-pressure oil pump cam and the second high-pressure oil pump cam are all sleeved on the outside of the camshaft body to form an interference fit.

[0018] As a preferred solution of the intake camshaft provided by the present invention, the shaft head end piece, the valve drive assembly, the first high-pressure oil pump cam, and the second high-pressure oil pump cam are integrally formed with the camshaft body.

[0019] According to another aspect of the present invention, an object is to provide an active pre-chamber engine. The active pre-chamber engine includes a sprocket, a timing mechanism, and two high-pressure oil pumps, and further includes the intake camshaft described in any of the above solutions. The sprocket and the timing mechanism are respectively connected to the shaft head end piece, and the two high-pressure oil pumps are respectively driven by the first high-pressure oil pump cam and the second high-pressure oil pump cam.

[0020] Advantages of the present invention:

[0021] The intake camshaft provided by the present invention includes a camshaft body, a shaft head end piece, at least one set of valve drive assemblies, a first high-pressure oil pump cam, and a second high-pressure oil pump cam. The shaft head end piece is connected to the end of the camshaft body, and the shaft head end piece is configured to connect to a sprocket; the valve drive assembly is sleeved outside the camshaft body, that is to say, the valve drive assembly is used to realize the linkage control of each intake component of the active pre-chamber engine. The first high-pressure oil pump cam and the second high-pressure oil pump cam are arranged on the camshaft body at intervals along the axis direction of the camshaft body, and the first high-pressure oil pump cam and the second high-pressure oil pump cam are respectively configured to drive two high-pressure oil pumps. That is to say, the simultaneous control of the two high-pressure oil pumps can be realized through the first high-pressure oil pump cam and the second high-pressure oil pump cam, with a simple structure, effectively reducing the complexity of the engine structure and the overall width of the engine. Description of the drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0023] Figure 1 is a schematic structural diagram of the intake camshaft provided by the embodiment of the present invention;

[0024] Figure 2 is a front view of the intake camshaft provided by the embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of the shaft head end piece provided by the embodiment of the present invention;

[0026] Figure 4 is a cross-sectional schematic diagram of the second stop shaft section provided by the embodiment of the present invention.

[0027] In the figure:

[0028] 100, camshaft body;

[0029] 200, shaft end piece; 210, connecting shaft section; 220, first stop shaft section; 230, second stop shaft section; 231, horizontal part; 232, first vertical part; 233, second vertical part; 234, arc part; 240, annular groove; 241, radial oil passage;

[0030] 300, valve drive assembly; 310, intake cam;

[0031] 400, first high-pressure oil pump cam;

[0032] 500, second high-pressure oil pump cam;

[0033] 600, signal wheel. Specific embodiments

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", "left", etc. are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0039] This embodiment provides an intake camshaft and an active pre-chamber engine. The active pre-chamber engine includes a sprocket, a timing mechanism and two high-pressure oil pumps, and also includes the intake camshaft provided in this embodiment. The sprocket and the timing mechanism are respectively connected to the intake camshaft, and the two high-pressure oil pumps can be simultaneously driven by the intake camshaft.

[0040] Figure 1 The structural schematic diagram of the intake camshaft provided by the embodiment of the present invention is shown; Figure 2 The front view of the intake camshaft provided by the embodiment of the present invention is shown. Refer to Figure 1 and Figure 2 , the intake camshaft provided in this embodiment includes a camshaft body 100, a shaft head end piece 200, at least one set of valve drive assemblies 300, a first high-pressure oil pump cam 400 and a second high-pressure oil pump cam 500. The shaft head end piece 200 is connected to the sprocket and the timing mechanism, and the above two high-pressure oil pumps are respectively driven by the first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500.

[0041] Specifically, the shaft head end piece 200 is connected to the end of the camshaft body 100, and the shaft head end piece 200 is configured to connect the sprocket and the timing mechanism. The valve drive assembly 300 is sleeved outside the camshaft body 100 and is configured to realize the linkage control of each intake component of the active pre-chamber engine. The first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500 are arranged at intervals along the axis direction of the camshaft body 100 on the camshaft body 100, and the first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500 are respectively configured to drive the two high-pressure oil pumps. The simultaneous control of the two high-pressure oil pumps can be realized through the first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500, with a simple structure, effectively reducing the complexity of the engine structure and the overall width of the whole machine.

[0042] More specifically, the second high-pressure oil pump cam 500 is arranged at the end of the camshaft body 100 away from the shaft head end piece 200. When the valve drive assembly 300 is a set, the first high-pressure oil pump cam 400 is arranged at an interval from the valve drive assembly 300; when the valve drive assembly 300 is more than one set, the first high-pressure oil pump cam 400 is arranged between two adjacent valve drive assemblies 300.

[0043] In this embodiment, the axial positions of the first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500 along the camshaft body 100 can be adjusted according to the specific space conditions of the engine, improving the flexibility of the layout of the high-pressure oil pump in the engine.

[0044] Preferably, in the initial design, the circumferential positions of the first high-pressure oil pump cam 400 and the second high-pressure oil pump cam 500 can be phase-optimized according to the drive torque characteristics of the two, which can play a role in weakening the drive torque of the two high-pressure oil pumps, and is beneficial to reducing the torsional vibration of the intake camshaft and the chain tension.

[0045] More specifically, the valve drive assembly 300 includes two intake cams 310, and the two intake cams 310 are arranged at intervals along the axial direction on the camshaft body 100. Exemplarily, in this embodiment, the valve drive assembly 300 is four sets, and the four sets of valve drive assemblies 300 are arranged at intervals along the axial direction on the camshaft body 100. The intake cams 310 of the above four sets of valve drive assemblies 300 respectively correspond to the eight valves of the four cylinders on the active pre-chamber engine to realize the linkage control of each intake component of the active pre-chamber engine. The specific cooperation is the prior art and will not be elaborated in this embodiment.

[0046] Continue to refer to Figure 1 and Figure 2 , the intake camshaft further includes a signal wheel 600, the signal wheel 600 is sleeved outside the camshaft body 100, is arranged adjacent to the second high-pressure oil pump cam 500, and is clamped between a valve drive assembly 300 and the second high-pressure oil pump cam 500. The signal wheel 600 has a number of tooth missing positions and can provide signals to the speed sensor according to the rotation position of the camshaft body 100. Its specific structure and signal sending principle belong to the prior art and will not be elaborated in this embodiment.

[0047] Figure 3 Show the structural schematic diagram of the shaft head end piece provided by the embodiment of the present invention. Refer to Figures 1-3 , the shaft head end piece 200 includes a connecting shaft section 210, and the connecting shaft section 210 is configured to connect the sprocket and the timing mechanism, and the sprocket and the timing mechanism are pressed onto the intake camshaft through bolts to drive the intake camshaft to rotate.

[0048] Specifically, the shaft head end member 200 further includes a first stop shaft section 220 and a second stop shaft section 230. The connecting shaft section 210 is fixedly connected to the first stop shaft section 220. The first stop shaft section 220 and the second stop shaft section 230 are arranged at intervals and are connected by a connecting section. The diameters of both the first stop shaft section 220 and the second stop shaft section 230 are larger than the diameter of the camshaft body 100. Through the above settings, the axial thrust function of the intake camshaft can be realized.

[0049] More specifically, a ring groove 240 is formed in the connecting section between the first stop shaft section 220 and the second stop shaft section 230. A radial oil passage 241 is formed at the bottom of the ring groove 240. The radial oil passage 241 communicates with an oil supply mechanism and is configured to supply oil to a timing mechanism to drive the timing mechanism to operate.

[0050] Figure 4 The cross-sectional schematic diagram of the second stop shaft section provided by the embodiment of the present invention is shown. Refer to Figure 1 、 Figure 2 and Figure 4 , the cross-sectional shape of the second stop shaft section 230 can indicate the installation direction of the camshaft body 100. Specifically, the side portion of the second stop shaft section 230 includes a horizontal portion 231, a first vertical portion 232, a second vertical portion 233, and an arc portion 234. When installing the intake camshaft, place the second stop shaft section 230 on the intake camshaft in the Figure 4 shown orientation, that is, the first vertical portion 232 and the second vertical portion 233 are vertical, the horizontal portion 231 faces upward, and the arc portion 234 faces downward. At this time, the intake camshaft is in the engine timing position. A special tool for installing the timing mechanism is sleeved on the second stop shaft section 230, and its working surface is attached to the first vertical portion 232 and the second vertical portion 233, which is used to clamp the intake camshaft, realizing the function of fixing the intake camshaft when tightening the bolt. Since the heights of the horizontal portion 231 and the arc portion 234 are different, the above special tool can only be installed in place when the second stop shaft section 230 is in the Figure 4 shown orientation state. If the intake camshaft is placed in the wrong position, that is, the horizontal portion 231 faces downward and the arc portion 234 faces upward, even if the first vertical portion 232 and the second vertical portion 233 are still vertical, the above special tool cannot be installed in place. The above settings enable the second stop shaft section 230 to have an anti-misalignment function, avoiding the risk of misinstalling the intake camshaft.

[0051] Optionally, in this embodiment, the shaft end member 200, the plurality of valve driving components 300, the first high-pressure oil pump cam 400, the second high-pressure oil pump cam 500, and the signal wheel 600 are all sleeved outside the camshaft body 100 and form an interference fit. Or in another embodiment, the shaft end member 200, the valve driving component 300, the first high-pressure oil pump cam 400, and the second high-pressure oil pump cam 500 are integrally formed with the camshaft body 100. The shaft end member 200 can provide an end support function for the camshaft body 100, and the camshaft body 100 can provide full support for the plurality of valve driving components 300, the first high-pressure oil pump cam 400, the second high-pressure oil pump cam 500, and the signal wheel 600. The above full support structure increases the stiffness of the entire intake camshaft, improves the running stability of the intake camshaft, and is beneficial to the reliable operation of the engine.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Intake camshaft, characterized in that, Comprising: A camshaft body (100); A shaft head end piece (200), the shaft head end piece (200) being connected to the end of the camshaft body (100), and the shaft head end piece (200) being configured to connect to a sprocket; At least one set of valve drive assemblies (300), the valve drive assemblies (300) being arranged outside the camshaft body (100); A first high-pressure oil pump cam (400) and a second high-pressure oil pump cam (500), the first high-pressure oil pump cam (400) and the second high-pressure oil pump cam (500) being arranged at intervals along the axial direction of the camshaft body (100) on the camshaft body (100), and the first high-pressure oil pump cam (400) and the second high-pressure oil pump cam (500) being respectively configured to drive two high-pressure oil pumps.

2. The intake camshaft according to claim 1, wherein The second high-pressure oil pump cam (500) is arranged at the end of the camshaft body (100) facing away from the shaft head end piece (200). When the valve drive assembly (300) is one set, the first high-pressure oil pump cam (400) is arranged at intervals from the valve drive assembly (300); when the valve drive assembly (300) is more than one set, the first high-pressure oil pump cam (400) is arranged between two adjacent valve drive assemblies (300).

3. The intake camshaft according to claim 1, characterized in that, The intake camshaft further includes a signal wheel (600), the signal wheel (600) being sleeved outside the camshaft body (100), being arranged adjacent to the second high-pressure oil pump cam (500), and being clamped between one valve drive assembly (300) and the second high-pressure oil pump cam (500).

4. The intake camshaft according to claim 1, characterized in that, The shaft head end piece (200) includes a connecting shaft section (210), and the connecting shaft section (210) is configured to connect to the sprocket.

5. The intake camshaft according to claim 4, characterized in that, The shaft head end piece (200) further includes a first stop shaft section (220) and a second stop shaft section (230). The connecting shaft section (210) is fixedly connected to the first stop shaft section (220). The first stop shaft section (220) and the second stop shaft section (230) are arranged at intervals and are connected by a connecting section. The diameters of the first stop shaft section (220) and the second stop shaft section (230) are both larger than the diameter of the camshaft body (100).

6. The intake camshaft according to claim 5, wherein, The side of the second stop shaft section (230) includes a horizontal portion (231), a first vertical portion (232), a second vertical portion (233), and an arc portion (234). The cross-sectional shape of the second stop shaft section (230) can indicate the installation direction of the camshaft body (100).

7. The intake camshaft according to claim 5, characterized in that, A ring groove (240) is formed in the connecting section between the first stop shaft section (220) and the second stop shaft section (230), and a radial oil passage (241) is formed at the bottom of the ring groove (240). The radial oil passage (241) is configured to supply engine oil to the timing mechanism.

8. The intake camshaft according to claim 1, characterized in that, The valve drive assembly (300) includes two intake cams (310), and the two intake cams (310) are arranged at intervals along the axial direction on the camshaft body (100).

9. The intake camshaft according to claim 1, wherein, The valve drive assemblies (300) are four in number, and the four valve drive assemblies (300) are arranged axially spaced apart on the camshaft body (100).

10. The intake camshaft according to any one of claims 1-9, characterized in that, The shaft end piece (200), the valve drive assembly (300), the first high-pressure oil pump cam (400), and the second high-pressure oil pump cam (500) are all sleeved outside the camshaft body (100) and form an interference fit.

11. The intake camshaft according to any one of claims 1-9, characterized in that, The shaft end piece (200), the valve drive assembly (300), the first high-pressure oil pump cam (400), and the second high-pressure oil pump cam (500) are integrally formed with the camshaft body (100).

12. The active pre-chamber engine includes a sprocket, a timing mechanism and two high-pressure oil pumps, characterized in that, It further includes the intake camshaft according to any one of claims 1-11, the sprocket and the timing mechanism are respectively connected to the shaft end piece (200), and the two high-pressure oil pumps are respectively driven by the first high-pressure oil pump cam (400) and the second high-pressure oil pump cam (500).

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