Camshaft sprocket positioning structure

Abstract

The utility model relates to a kind of camshaft sprocket positioning structure, including sprocket body, installation through-hole is equipped in the center of sprocket body, annular protrusion is equipped on one side of sprocket body, annular protrusion is located the periphery of installation through-hole, annular protrusion and the side surface of sprocket body cooperation form the slot for the insertion of camshaft, plug is equipped on the front end surface of camshaft, plug is inserted into installation through-hole;Positioning pin for positioning camshaft is installed on sprocket body.The utility model reconstructs the positioning form of camshaft, camshaft is positioned by the mode of installing positioning pin on sprocket body, the positioning mode of positioning pin is compared to the mode of keyway positioning, the influence of sprocket body structural strength will significantly reduce.At the same time, annular protrusion also assists to improve the structural strength of sprocket body.

Description

Technical Field

[0001] This utility model relates to the field of camshaft sprocket manufacturing technology, and in particular to a camshaft sprocket positioning structure. Background Technology

[0002] The camshaft sprocket is a key component in the engine's valve train. During engine operation, its primary function is to transmit power from the crankshaft to the camshaft to precisely control the opening and closing timing of the valves.

[0003] Currently, the structure of conventional camshaft sprockets is basically the same as that disclosed in patent application number 2011201679280. Patent application number 2011201679280 provides a camshaft timing sprocket, including a sprocket body, a shaft hole for cooperating with the camshaft on the sprocket body, and a keyway on the sprocket body, the opening of which is located at the shaft hole; at the same time, the sprocket body has a plurality of circumferentially arranged weight-reducing holes, and the sprocket body is formed by powder metallurgy.

[0004] The sprocket structure disclosed in the above application reduces the structural strength of the sprocket body due to the setting of multiple weight-reducing holes. In this case, the setting of the keyway greatly reduces the structural strength at the location of the keyway, further reducing the structural strength of the sprocket body.

[0005] To reduce the impact on the structural strength of the sprocket body, this invention modifies the positioning method of the camshaft by pressing a positioning pin into the sprocket body. Compared with the keyway positioning method, the positioning pin positioning method significantly reduces the impact on the structural strength of the sprocket body. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing a camshaft sprocket positioning structure.

[0007] This utility model is achieved through the following technical solution: a camshaft sprocket positioning structure is provided, including a sprocket body, a mounting through hole at the center of the sprocket body, an annular protrusion on one side of the sprocket body, the annular protrusion being located around the mounting through hole, the annular protrusion cooperating with the side of the sprocket body to form a slot for inserting a camshaft, a plug on the front end face of the camshaft, the plug being inserted into the mounting through hole; and a positioning pin for positioning the camshaft is installed on the sprocket body.

[0008] Preferably, the sprocket body has a mounting through hole on its disc surface, a locating pin is inserted into the mounting through hole and is interference-fitted, and an avoidance notch is provided on the annular protrusion to avoid the locating pin.

[0009] Preferably, the end face of the locating pin is flush with the top surface of the annular protrusion. The annular protrusion improves the structural strength of the sprocket body and forms a slot for mounting the camshaft, thus facilitating the positioning and installation of the camshaft.

[0010] Preferably, the camshaft has a positioning groove that mates with a positioning pin, and the positioning pin is embedded in the positioning groove.

[0011] Preferably, the annular protrusion and the sprocket body are integrally formed by powder metallurgy.

[0012] Preferably, the plug has a threaded hole. After the plug is inserted into the mounting hole, the sprocket body is pressed down by a pressure plate. A bolt passes through the pressure plate and is threaded into the threaded hole. The sprocket body is fixed to the camshaft by the cooperation of the pressure plate and the bolt.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model modifies the positioning method of the camshaft by installing a locating pin on the sprocket body to position the camshaft. Compared with the keyway positioning method, the locating pin positioning method significantly reduces the impact on the structural strength of the sprocket body. At the same time, the annular protrusion also helps to improve the structural strength of the sprocket body.

[0015] 2. The annular protrusion not only improves the structural strength of the sprocket body, but also forms a slot for mounting the camshaft, thus facilitating the positioning and installation of the camshaft. Attached Figure Description

[0016] Figure 1 A front view of an existing camshaft sprocket;

[0017] Figure 2 This is a front view of the present invention without the locating pin installed;

[0018] Figure 3 yes Figure 2 Sectional view along line AA;

[0019] Figure 4 This is a front view of the present invention when the positioning pin is installed;

[0020] Figure 5 This is a front view of the camshaft of this utility model;

[0021] Figure 6 This is a front view of the camshaft and sprocket assembly relationship of this utility model;

[0022] Figure 7 yes Figure 6 Sectional view along the BB direction;

[0023] As shown in the figure:

[0024] 1. Sprocket body, 2. Weight reduction hole, 3. Annular protrusion, 4. Mounting through hole, 5. Slot, 6. Assembly through hole, 7. Clearance notch, 8. Locating pin, 9. Camshaft, 10. Plug, 11. Locating groove, 12. Pressure plate, 13. Bolt, 14. Threaded hole. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0026] like Figure 2-7 As shown, this utility model includes a sprocket body 1, with a mounting through hole 4 at the center of the sprocket body 1. An annular protrusion 3 is located on one side of the sprocket body 1, surrounding the mounting through hole 4. The annular protrusion 3 mates with the side of the sprocket body 1 to form a slot 5 for inserting a camshaft 9. A plug 10 is provided on the front end face of the camshaft 9, and the plug 10 is inserted into the mounting through hole 4. A positioning pin 8 for positioning the camshaft 9 is installed on the sprocket body 1.

[0027] In this embodiment, a mounting through hole 6 is provided on the disc surface of the sprocket body 1. A positioning pin 8 is inserted into the mounting through hole 6 with an interference fit. A clearance notch 7 is provided on the annular protrusion 3 to avoid the positioning pin 8. Furthermore, the end face of the positioning pin 8 is flush with the top surface of the annular protrusion 3. The annular protrusion 3 can improve the structural strength of the sprocket body 1 on the one hand, and form a slot 5 for mounting the camshaft 9 on the other hand, thereby facilitating the positioning and installation of the camshaft 9.

[0028] In this embodiment, a positioning groove 11 is provided on the camshaft 9 to cooperate with the positioning pin 8, and the positioning pin 8 is embedded in the positioning groove 11.

[0029] In this embodiment, the annular protrusion 3 and the sprocket body 1 are integrally formed by powder metallurgy.

[0030] In this embodiment, the plug 10 is provided with a threaded hole 14. After the plug 10 is inserted into the mounting through hole 4, the sprocket body 1 is pressed down by the pressure plate 12. The bolt 13 passes through the pressure plate 12 and is threadedly connected to the threaded hole 14. The sprocket body 1 is fixed to the camshaft 9 by the cooperation of the pressure plate 12 and the bolt 13.

[0031] In this embodiment, the sprocket body 1 has a plurality of weight-reducing holes 2 distributed circumferentially along the disc surface.

[0032] In practical use, insert the camshaft 9 into the slot 5 and insert the plug 10 into the mounting through hole 4. Then, fix the sprocket body 1 and the camshaft 9 together using the pressure plate 12 and the bolt 13.

[0033] This invention modifies the positioning method of the camshaft 9 by installing a positioning pin 8 on the sprocket body 1 to position the camshaft 9. Compared with the keyway positioning method, the positioning pin 8 method significantly reduces the impact on the structural strength of the sprocket body 1. At the same time, the annular protrusion 3 also helps to improve the structural strength of the sprocket body 1.

[0034] Of course, the above description is not limited to the examples above. Technical features not described in this utility model can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A camshaft sprocket positioning structure, characterized in that: The sprocket body includes a mounting through hole at its center and an annular protrusion on one side of the sprocket body. The annular protrusion is located around the mounting through hole and mates with the side of the sprocket body to form a slot for inserting a camshaft. A plug is provided on the front end face of the camshaft and is inserted into the mounting through hole. A locating pin for positioning the camshaft is installed on the sprocket body.

2. The camshaft sprocket positioning structure according to claim 1, characterized in that: The sprocket body has an assembly through hole on its disc surface. The locating pin is inserted into the assembly through hole with an interference fit. The annular protrusion has a clearance notch to avoid the locating pin.

3. The camshaft sprocket positioning structure according to claim 2, characterized in that: The end face of the locating pin is flush with the top face of the annular protrusion.

4. The camshaft sprocket positioning structure according to claim 1, characterized in that: The camshaft has a locating groove that mates with a locating pin, and the locating pin is embedded in the locating groove.

5. The camshaft sprocket positioning structure according to claim 1, characterized in that: The annular protrusion and the sprocket body are integrally formed by powder metallurgy.

6. The camshaft sprocket positioning structure according to claim 1, characterized in that: The plug has a threaded hole. After the plug is inserted into the mounting hole, the sprocket body is pressed down by the pressure plate. The bolt passes through the pressure plate and is threadedly connected to the threaded hole.

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