Engine cam, cam shaft structure, engine and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and discloses an engine cam, a cam shaft structure, an engine and a vehicle. The engine cam comprises a base circle part and a protruding part connected to the periphery of the base circle part, a groove is formed in the peripheral wall of the base circle part in a concave mode in the first radial direction, an opening of the groove is opposite to the protruding part in the first radial direction, and the central axis of the groove passes through the vertex of the protruding contour line of the protruding part. According to the engine cam, due to the fact that the opening of the groove is back on to the protruding part in the first radial direction, and the central axis of the groove passes through the vertex of the protruding contour line of the protruding part, the base circle part of the engine cam is small in stress relative to the protruding part in the working process of an engine; therefore, the weight and the rotational inertia of the engine cam can be effectively reduced, the structural strength of the cam part can be effectively guaranteed, the working performance of the engine cam can be effectively improved, and the service life of the engine cam can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially relates to engine cam, cam shaft structure, engine and vehicle. BACKGROUND

[0002] As a key component of the vehicle engine valve train mechanism, the cam shaft rotates with variable acceleration along with the engine speed, and the cam shaft consumes energy during acceleration and deceleration. Therefore, reducing the weight and inertia of the cam shaft is of great significance to engine energy saving. The cam is a key component of the cam shaft, so the structural design of the cam directly affects the working performance of the cam shaft.

[0003] An engine cam in the prior art has a weight-reducing groove recessed at both axial ends, the profile shape of the weight-reducing groove corresponds to the profile shape of the cam, and the engine cam is drilled through the two weight-reducing grooves along the axial direction. Although it can effectively reduce the weight and moment of inertia of the engine cam, the lift section of the engine cam is subjected to a large force during the working process, and long-term working of the engine cam can cause deformation, damage or even damage to the lift section. The working performance and service life of the engine cam need to be improved. SUMMARY

[0004] The utility model aims at providing engine cam, cam shaft structure, engine and vehicle to solve the above problems existing in the prior art engine cam.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The engine cam comprises a base circle part and a protruding part connected to the outer periphery of the base circle part, the outer peripheral wall of the base circle part is recessed with a groove along a first radial direction, the opening of the groove is away from the protruding part along the first radial direction, and the center axis of the groove passes through the top point of the protruding profile line of the protruding part.

[0007] As a preferred scheme of the above engine cam, the groove penetrates the outer peripheral wall of the base circle part along a second radial direction, and the first radial direction is perpendicular to the second radial direction.

[0008] As a preferred scheme of the above engine cam, along the axial direction of the base circle part, the groove is located in the middle region of the base circle part.

[0009] As a preferred scheme of the above engine cam, the value of h / d is greater than zero and less than or equal to 0.55; wherein h is the maximum recessed depth of the groove along the first radial direction, and d is the diameter of the base circle part.

[0010] As a preferred form of the engine cam, a / b is greater than zero and less than or equal to 0.5, wherein a is the maximum width of the groove along the axial direction of the base circle portion, and b is the axial thickness of the base circle portion.

[0011] As a preferred form of the engine cam, the engine cam is an engine intake cam, or the engine cam is an engine exhaust cam.

[0012] The camshaft structure comprises a wheel shaft body and the engine cam described above, and the base circle portion is fixedly sleeved or integrally formed on the wheel shaft body.

[0013] As a preferred form of the camshaft structure, the number of the engine cams is multiple, and the multiple engine cams are distributed along the axial direction of the wheel shaft body.

[0014] The engine comprises the camshaft structure described above.

[0015] The vehicle comprises the engine described above.

[0016] The beneficial effects of the utility model are as follows:

[0017] The utility model provides an engine cam, which comprises a base circle portion and a protruding portion connected to the outer periphery of the base circle portion, wherein the outer peripheral wall of the base circle portion is concavely provided with a groove along a first radial direction, the opening of the groove faces away from the protruding portion along the first radial direction, and the central axis of the groove passes through the top point of the protruding contour line of the protruding portion.

[0018] The engine cam is provided with the opening of the groove facing away from the protruding portion along the first radial direction and the central axis of the groove passing through the top point of the protruding contour line of the protruding portion, so that the base circle portion of the engine cam is subjected to smaller force relative to the protruding portion during the operation of the engine, and thus the weight and the moment of inertia of the engine cam can be effectively reduced, the structural strength of the cam portion can be effectively ensured, and the working performance and the service life of the engine cam can be effectively improved.

[0019] The utility model further provides a camshaft structure, which comprises a wheel shaft body and the engine cam described above, and the base circle portion is fixedly sleeved or integrally formed on the wheel shaft body. By adopting the engine cam described above, the working performance and the service life of the camshaft structure can be effectively improved.

[0020] The utility model further provides an engine, which comprises the camshaft structure described above. By adopting the camshaft structure described above, the working performance and the service life of the engine can be effectively improved, and the energy consumption of the engine can be effectively reduced.

[0021] This utility model also provides a vehicle, including the aforementioned engine. By using the aforementioned engine, the vehicle's performance can be effectively improved and fuel consumption reduced. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of the engine cam along a first-view perspective provided in a specific embodiment of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the engine cam along a second perspective provided in a specific embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the engine cam provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 1. Engine cam; 11. Base circle; 111. Groove; 112. Sub-section; 12. Protrusion. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figures 1-3 As shown, the present invention provides an engine cam 1, which includes a base circle portion 11 and a protrusion portion 12 connected to the outer periphery of the base circle portion 11. The outer peripheral wall of the base circle portion 11 is recessed along a first radial direction with a groove 111. The opening of the groove 111 faces away from the protrusion portion 12 along the first radial direction, and the central axis of the groove 111 passes through the apex of the protrusion outline of the protrusion portion 12.

[0032] The engine cam 1 has an opening of a groove 111 that faces away from the protrusion 12 along the first radial direction, and the central axis of the groove 111 passes through the apex of the protrusion outline of the protrusion 12. Since the base circle portion 11 of the engine cam 1 experiences less force than the protrusion 12 during engine operation, this configuration, compared with the prior art, can effectively reduce the weight and moment of inertia of the engine cam 1, and effectively ensure the structural strength of the cam portion, thereby effectively improving the working performance and service life of the engine cam 1.

[0033] It is understandable that the first radial direction is parallel to the central axis of the groove 111.

[0034] Specifically, the cam portion includes a lift portion and a return portion that are circumferentially connected along the base circle portion 11. In this embodiment, the lift portion and return portion of the cam portion are symmetrically distributed. In other embodiments, the lift portion and return portion of the cam portion may also be configured as an asymmetrical structure.

[0035] Preferably, the base circle portion 11 and the protrusion portion 12 of the engine cam 1 are integrally formed. This further improves the structural strength and service life of the engine cam 1. Specifically, the integral forming method is forging, casting, or milling, etc.

[0036] Preferably, such as Figure 2 and Figure 3 As shown, the groove 111 penetrates the outer peripheral wall of the base circle portion 11 along the second radial direction, and the first radial direction is perpendicular to the second radial direction. This arrangement can further reduce the weight and moment of inertia of the engine cam 1 while ensuring the structural strength of the engine cam; secondly, it is easier to process and manufacture compared to the groove 111 not penetrating the outer peripheral wall of the base circle portion 11 along the second radial direction.

[0037] It is understood that the cross-sectional shape of the formed groove 111 along the axial direction of the base circle portion 11 is semi-circular or arc-shaped. Specifically, when the maximum depth of the groove 111 along the first radial direction is equal to the radius of the base circle portion 11, the cross-sectional shape of the formed groove 111 along the axial direction of the base circle portion 11 is semi-circular; when the maximum depth of the groove 111 along the first radial direction is less than or greater than the radius of the base circle portion 11, the cross-sectional shape of the formed groove 111 along the axial direction of the base circle portion 11 is arc-shaped.

[0038] As an alternative, the groove 111 does not penetrate the outer peripheral wall of the base circle portion 11 along the second radial direction, and the first radial direction is perpendicular to the second radial direction. In this case, the cross-sectional shape of the groove 111 along the axial direction of the base circle portion 11 is square, rectangular, semi-circular, or arc-shaped, etc.

[0039] Preferably, such as Figure 2 As shown, along the axial direction of the base circle 11, the groove 111 is located in the middle region of the base circle 11. This arrangement results in two symmetrically distributed sub-sections 112 forming on both sides of the groove 111 along the axial direction of the base circle 11. During engine operation, the two sub-sections 112 experience uniform force, thereby further improving the working performance and service life of the engine cam 1.

[0040] As an alternative, along the axial direction of the base circle portion 11, the groove 111 may also be provided in any set area that is offset from the middle region of the base circle portion 11.

[0041] Among them, such as Figure 1 and Figure 2 As shown, the value of h / d is greater than zero and less than or equal to 0.55; h is the maximum recessed depth of the groove 111 along the first radial direction, and d is the diameter of the base circle 11. It can be understood that the value of h / d can be 0.55, 0.5, 0.4, 0.3, or 0.2, etc. The value of h / d is selected based on the actual working conditions. The range of h / d is an empirical range obtained by combining theoretical analysis and a large number of previous experiments.

[0042] Among them, such as Figure 2 As shown, the value of a / b is greater than zero and less than or equal to 0.5; a is the maximum width of the groove 111 along the axial direction of the base circle 11, and b is the axial thickness of the base circle 11. It can be understood that the value of a / b can be 0.5, 0.4, 0.3, or 0.2, etc. The value of a / b is selected based on the actual working conditions. The value of a / b is an empirical range obtained by combining theoretical analysis and a large number of previous experiments.

[0043] In this embodiment, as Figures 1-3As shown, preferably along the axial direction of the base circle 11, the groove 111 is located in the middle region of the base circle 11. The value of h / d is 0.55. The value of a / b is 0.5. The groove 111 penetrates the outer peripheral wall of the base circle 11 along the second radial direction. Specifically, compared with an engine cam of the same shape and size but without the groove, the weight of the engine cam 1 in this embodiment is reduced by 23%, and the moment of inertia is reduced by 28%.

[0044] Optionally, the engine cam 1 is an engine intake cam. This can improve the performance and service life of the engine intake cam.

[0045] Optionally, the engine cam 1 is an engine exhaust cam. This can improve the working performance and service life of the engine exhaust cam.

[0046] This utility model also provides a camshaft structure, including a wheel axle body and the aforementioned engine cam 1, with the base circle portion 11 fixedly sleeved or integrally formed onto the wheel axle body. By using the aforementioned engine cam 1, the working performance and service life of the camshaft structure can be effectively improved. The base circle portion 11 is fixedly sleeved onto the wheel axle body via key connection, interference fit, or welding, etc.

[0047] Specifically, there are multiple engine cams 1, which are distributed at intervals along the axial direction of the wheel axle body. Furthermore, the multiple engine cams 1 include at least an engine intake cam and an engine exhaust cam.

[0048] This invention also provides an engine including the aforementioned camshaft structure. By adopting the aforementioned camshaft structure, the engine's performance and service life can be effectively improved, and engine energy consumption can be effectively reduced.

[0049] This utility model also provides a vehicle, including the aforementioned engine. By using the aforementioned engine, the vehicle's performance can be effectively improved, and fuel consumption can be effectively reduced.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An engine cam, characterized in that, It includes a base circle portion (11) and a protrusion portion (12) connected to the outer periphery of the base circle portion (11). The outer peripheral wall of the base circle portion (11) is recessed with a groove (111) along a first radial direction. The opening of the groove (111) faces away from the protrusion portion (12) along the first radial direction, and the central axis of the groove (111) passes through the apex of the protrusion outline of the protrusion portion (12).

2. The engine cam according to claim 1, characterized in that, The groove (111) penetrates the outer peripheral wall of the base circle portion (11) along the second radial direction, and the first radial direction is perpendicular to the second radial direction.

3. The engine cam according to claim 1, characterized in that, Along the axial direction of the base circle portion (11), the groove (111) is located in the middle region of the base circle portion (11).

4. The engine cam according to claim 1, characterized in that, The value of h / d is greater than zero and less than or equal to 0.55; where h is the maximum recessed depth of the groove (111) along the first radial direction, and d is the diameter of the base circle (11).

5. The engine cam according to claim 1, characterized in that, The value of a / b is greater than zero and less than or equal to 0.5; where a is the maximum width of the groove (111) along the axial direction of the base circle portion (11), and b is the axial thickness of the base circle portion (11).

6. The engine cam according to claim 1, characterized in that, The engine cam is an engine intake cam; or, the engine cam is an engine exhaust cam.

7. A camshaft structure, including a wheel axle body, characterized in that, It also includes the engine cam as described in any one of claims 1-6, wherein the base circle portion (11) is fixedly sleeved or integrally formed on the wheel axle body.

8. The camshaft structure according to claim 7, characterized in that, The number of engine cams is multiple, and the multiple engine cams are distributed at intervals along the axial direction of the wheel axle body.

9. An engine, characterized in that, Includes the camshaft structure as described in any one of claims 7-8.

10. A vehicle, characterized in that, Includes the engine as described in claim 9.

Images