A camshaft

Abstract

This utility model discloses a camshaft, relating to the field of engine technology. The utility model includes a shaft body on which at least one set of cams is constructed. A timing positioning mechanism is coaxially mounted at one end of the shaft body, and a timing signal disk is coaxially mounted at the other end. The timing positioning mechanism has a positioning part and a connecting part sequentially arranged along the axis of the shaft body. The positioning part contains a limit mechanism and a positioning mechanism. This simplifies camshaft timing positioning, provides high positioning accuracy, and facilitates engine disassembly and assembly.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to a camshaft. Background Technology

[0002] The working cycle of a modern four-stroke piston engine relies on a precise phase synchronization between the crankshaft and the camshaft. The crankshaft is driven by the linear motion of the pistons, while the camshaft controls the opening and closing of the valves to precisely draw in fresh air / mixture and expel exhaust gases.

[0003] Camshaft timing refers to the angular position of the camshaft relative to the crankshaft. The core purpose of timing alignment is to recalibrate the camshaft and crankshaft to the absolute phase relationship specified by the engine manufacturer after assembly and maintenance. Inaccurate timing alignment will lead to serious engine performance problems or even mechanical damage.

[0004] Currently, when performing timing positioning on engine camshafts, timing positioning fixtures need to be installed between the intake and exhaust camshafts. This positioning method requires high precision in the machining of the fixtures and camshaft positioning surfaces, making it difficult to guarantee timing positioning accuracy and affecting assembly line efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a camshaft that simplifies camshaft timing positioning, achieves high positioning accuracy, and facilitates engine disassembly and assembly.

[0006] To achieve the above objectives, the present invention employs the following technical means: A camshaft includes a shaft body on which at least one set of cams is configured. A timing positioning mechanism is coaxially mounted at one end of the shaft body, and a timing signal disk is coaxially mounted at the other end of the shaft body. The timing positioning mechanism is provided with a positioning part and a connecting part in sequence along the axis of the shaft. The positioning part has a built-in limit mechanism and a positioning mechanism.

[0007] Preferably, the connecting part is a tapered head constructed at the end of the shaft, and the outer diameter of the tapered head is reduced along the axial extension direction of the shaft.

[0008] Furthermore, the limiting mechanism includes a limiting disk connected to the large outer diameter end of the conical head, the outer diameter of the limiting disk being larger than the maximum outer diameter of the conical head.

[0009] Furthermore, the positioning mechanism is a positioning groove disposed on the outer edge of the limiting disc, and the opening direction of the positioning groove extends radially along the limiting disc.

[0010] Furthermore, the cam assembly includes a first cam and a second cam with the same protrusion direction, and the protrusion direction of the first cam and the second cam is perpendicular to the axis of the shaft.

[0011] Furthermore, a positioning plate is coaxially mounted on the shaft between the cam assembly and the timing positioning mechanism, and the shaft between the positioning plate and the timing positioning mechanism serves as a journal.

[0012] Furthermore, one end of the shaft with the timing positioning mechanism is coaxially provided with a positioning hole extending in the extension direction, the positioning hole being used for disassembly and connection with the installation fixture.

[0013] This utility model has the following beneficial effects during use: The camshaft timing positioning mechanism is located on the timing pulley mounting cone end disc on the shaft. This timing positioning mechanism has a simple structure, simplifies the camshaft timing positioning tooling, has high positioning accuracy, and is beneficial for engine disassembly and assembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this year's utility model.

[0015] Figure 2 This is a front view structural diagram of the timing positioning mechanism of this utility model.

[0016] Among them, 1-timing positioning mechanism, 101-limiting disc, 102-positioning groove, 103-connecting part, 2-shaft journal, 3-cam group, 301-first cam, 302-second cam, 4-shaft body, 5-timing signal disc, 6-installation fixture. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and 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 orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0023] Please refer to Figure 1 and Figure 2 As shown, a camshaft includes a shaft body 4, on which at least one set of cam groups 3 are constructed. A timing positioning mechanism 1 is coaxially mounted at one end of the shaft body 4, and a timing signal disk 5 is coaxially mounted at the other end of the shaft body 4. The timing positioning mechanism 1 is provided with a positioning part and a connecting part 103 in sequence along the axial direction of the shaft 4. The positioning part has a built-in limit mechanism and a positioning mechanism.

[0024] Preferably, the connecting part 103 is a tapered head constructed at the end of the shaft body 4, and the outer diameter of the tapered head is reduced along the axial extension direction of the shaft body 4.

[0025] Furthermore, the limiting mechanism includes a limiting disk 101 connected to the large outer diameter end of the conical head, the outer diameter of the limiting disk 101 being larger than the maximum outer diameter of the conical head.

[0026] Furthermore, the positioning mechanism is a positioning groove 102 disposed on the outer edge of the limiting disk 101, and the opening direction of the positioning groove 102 extends radially along the limiting disk 101.

[0027] Furthermore, the cam assembly 3 includes a first cam 301 and a second cam 302 with the same protrusion direction, and the protrusion direction of the first cam 301 and the second cam 302 is perpendicular to the axis of the shaft 4.

[0028] Furthermore, a positioning plate is coaxially mounted on the shaft 4 between the cam group 3 and the timing positioning mechanism 1, and the shaft 4 between the positioning plate and the timing positioning mechanism serves as the journal 2.

[0029] Furthermore, the shaft 4 is provided with a positioning hole coaxially extending in the extension direction at one end of the timing positioning mechanism 1, and the positioning hole is used for disassembly and connection with the mounting fixture 6.

[0030] This utility model has the following beneficial effects during use: The camshaft timing positioning mechanism 1 is located on the timing pulley mounting cone end disc on the shaft 4. The timing positioning mechanism 1 has a simple structure, simplifies the camshaft timing positioning fixture, has high positioning accuracy, and is beneficial for engine disassembly and assembly.

[0031] In this embodiment, a positioning groove 102 is machined on the limiting disc 101, and the connecting part 103 cooperates with the timing belt pulley and is fixedly positioned by the pulley bolt; the journal 2 mainly restricts the axial degree of freedom of the camshaft; the cam group 3 is used to control the opening and closing of the valves; the timing signal disc 5 is used to determine the crankshaft position and angle, and works with the sensor to ensure the normal operation of the engine; the mounting fixture 6 for assembly is used to install the entire shaft 4.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A camshaft, comprising a shaft body (4), characterized in that, At least one set of cams (3) is constructed on the shaft (4), a timing positioning mechanism (1) is coaxially mounted on one end of the shaft (4), and a timing signal disk (5) is coaxially mounted on the other end of the shaft (4). The timing positioning mechanism (1) is provided with a positioning part and a connecting part (103) in sequence along the axis of the shaft (4). The positioning part has a built-in limit mechanism and a positioning mechanism.

2. A camshaft according to claim 1, characterized in that, The connecting part (103) is a tapered head constructed at the end of the shaft (4), and the outer diameter of the tapered head is reduced along the axial extension direction of the shaft (4).

3. A camshaft according to claim 2, characterized in that, The limiting mechanism includes a limiting disk (101) connected to the large outer diameter end of the conical head, the outer diameter of the limiting disk (101) being larger than the maximum outer diameter of the conical head.

4. A camshaft according to claim 3, characterized in that, The positioning mechanism is a positioning groove (102) provided on the outer edge of the limiting disk (101), and the opening direction of the positioning groove (102) extends radially along the limiting disk (101).

5. A camshaft according to claim 1, characterized in that, The cam assembly (3) includes a first cam (301) and a second cam (302) with the same protrusion direction. The protrusion direction of the first cam (301) and the second cam (302) is perpendicular to the axis of the shaft (4).

6. A camshaft according to claim 1, characterized in that, The shaft (4) is coaxially mounted with a positioning disk between the cam group (3) and the timing positioning mechanism (1), and the shaft (4) between the positioning disk and the timing positioning mechanism serves as the journal (2).

7. A camshaft according to claim 1, characterized in that, The shaft (4) is provided with a positioning hole coaxially extending in the extension direction at one end of the timing positioning mechanism (1), and the positioning hole is used for disassembly and connection with the installation fixture (6).

Images