Cam shaft for transmission

Abstract

The utility model discloses a cam shaft for transmission, which comprises a shaft body, a shaft head arranged at one end of the shaft body, a shaft neck arranged at the other end of the shaft body, a shaft head mounting gear and a shaft diameter mounting bearing, the shaft shoulders are distributed on the shaft body at intervals, and the shaft shoulders have different shaft diameters; the multiple cams are distributed on the shaft body at intervals, and the cams have different steering angles; the left transmission wheel is relatively located at the left end of the shaft body, and an inner groove is annularly formed in the center of the left transmission wheel; the right transmission wheel is relatively located at the right end of the shaft body, and the surface of the right transmission wheel is provided with a helical tooth part. The left transmission wheel and the right transmission wheel are arranged at the two ends of the shaft body, the inner groove is matched with the ball bearing, and the helical tooth portion is matched with the helical gear, so that rotation stability is enhanced, torque force borne by the end shaft heads is reduced, tooth scraping is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of camshafts, and in particular relates to a transmission camshaft. Background Art

[0002] The camshaft is a component in a piston engine. Its function is to control the opening and closing of the valves. Although the speed of the camshaft in a four-stroke engine is half that of the crankshaft (in a two-stroke engine, the camshaft speed is the same as the crankshaft), its speed is usually still very high and it needs to withstand a large torque. Therefore, the design of the camshaft has high requirements for strength and support, and its material is generally high-quality alloy steel or alloy steel. Since the movement of the valves is related to the power and operating characteristics of an engine, the camshaft design occupies a very important position in the design process of the engine.

[0003] Most existing camshafts are one-piece structures. During the torsional transmission process, the cam on its surface is subjected to great torque, which will cause large end gears and key scrapping, thereby affecting transmission efficiency and accuracy, resulting in scrapping and increasing costs.

[0004] Therefore, there is a need for a transmission camshaft structure that can maintain strong stability under high torque conditions. Utility Model Content

[0005] In view of this, the technical problem to be solved by the utility model is to provide a transmission camshaft to avoid the trouble that the gears and keys of the camshaft are easily scraped under high torque, thus affecting the smooth transmission.

[0006] In order to solve the above technical problems, the utility model discloses a transmission camshaft, comprising:

[0007] A shaft body, with a shaft head at one end and a shaft journal at the other end, a gear mounted on the shaft head and a bearing mounted on the shaft diameter;

[0008] Shaft shoulders, multiple shaft shoulders are provided and are distributed at intervals on the shaft body, and the shaft shoulders have different shaft diameters;

[0009] Cams, multiple cams are provided and spaced apart on the shaft body, and the cams have different steering angles;

[0010] The left transmission wheel is relatively located at the left end of the shaft body and has an inner groove arranged in an annular manner in the center;

[0011] The right transmission wheel is relatively located at the right end of the shaft body and has a helical tooth portion on its surface.

[0012] According to one embodiment of the utility model, the left transmission wheel is provided with a roller bearing, and the inner groove is used to accommodate the ball.

[0013] According to an embodiment of the present invention, the helical tooth portion meshes with a helical gear.

[0014] According to an embodiment of the utility model, the shaft head is provided with a keyway, and the keyway cooperates with the gear through a key.

[0015] According to an embodiment of the utility model, the right transmission wheel is located at one end of the journal.

[0016] Compared with the prior art, the utility model can obtain the following technical effects:

[0017] By arranging left and right transmission wheels at both ends of the shaft body, the inner groove is matched with ball bearings, and the helical tooth part is matched with helical gears, the rotation stability is enhanced, and at the same time the torque force on the end shaft head is reduced, the gear scraping is avoided, and the service life is increased.

[0018] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 It is a schematic diagram of a transmission camshaft according to an embodiment of the utility model.

[0021] Figure ID

[0022] Axle body 10 , shaft head 11 , shaft journal 12 , shaft shoulder 20 , cam 30 , left transmission wheel 40 , inner groove 41 , right transmission wheel 50 , bevel gear portion 51 . DETAILED DESCRIPTION

[0023] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0024] Please refer to Figure 1 , Figure 1 It is a schematic diagram of a transmission camshaft according to an embodiment of the utility model.

[0025] As shown in the figure, a transmission camshaft includes: a shaft body 10, a shaft head 11 is arranged at one end of the shaft body 10, and a shaft neck 12 is arranged at the other end, the shaft head 11 is installed with a gear, and the shaft diameter 12 is installed with a bearing; a shaft shoulder 20, a plurality of shaft shoulders 20 are arranged and are distributed at intervals on the shaft body 10, and the shaft shoulders 20 have different shaft diameters; a cam 30, a plurality of cams 30 are arranged and are distributed at intervals on the shaft body 10, and the cams 30 have different steering angles; a left transmission wheel 40, the left transmission wheel 40 is relatively located at the left end of the shaft body 10, and has a ring-shaped inner groove 41 in the center; a right transmission wheel 50, the right transmission wheel 50 is relatively located at the right end of the shaft body 10, and has a helical tooth portion 51 on the surface.

[0026] In one embodiment of the utility model, a shaft head 11 and a shaft journal 12 are respectively provided at both ends of the shaft body 10 of the camshaft, wherein the shaft head 11 is installed with a gear, and the shaft journal 12 is installed with a bearing. A flat key is provided at the shaft head 11 to facilitate the installation of the gear, and the surface of the shaft journal 12 is polished. The shaft shoulder 20 is a ring portion with different shaft diameters, and its shaft diameter is larger than the shaft body, which is used for step changes to improve the strength of the camshaft itself. The cam 30 is used to cooperate with the transmission and drive the piston to operate. It is provided in multiples according to needs, and is distributed in different directions to meet the piston's air intake and exhaust requirements.

[0027] A left transmission wheel 40 and a right transmission wheel 50 are also provided at both ends of the shaft body 10 to improve the rotation stability of the camshaft. Specifically, an inner groove is provided in the middle of the left transmission wheel 40 for accommodating a ball bearing and sleeved with a roller bearing, which is convenient for assembly, maintenance and adding lubricating oil. The right transmission wheel 50 is provided with a helical tooth portion 51 for meshing with a helical gear to enhance the stability of the transmission, and it runs synchronously with the driving gear installed at the shaft head 11.

[0028] In addition, the right transmission wheel 50 is located at one end of the journal 12, opposite to the driving gear, to enhance the stability of both ends.

[0029] In summary, the utility model provides left and right transmission wheels at both ends of the shaft body 10, the inner groove 41 cooperates with the ball bearing, and the helical tooth part 51 cooperates with the helical gear, so as to enhance the stability of rotation, reduce the torque force on the end shaft head 11, avoid scraping, and improve the service life.

[0030] The above description shows and describes several preferred embodiments of the utility model, but as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A transmission camshaft, characterized in that: include: A shaft body, wherein a shaft head is arranged at one end of the shaft body and a shaft neck is arranged at the other end, a gear is mounted on the shaft head, and a bearing is mounted on the shaft neck; Axle shoulders, wherein a plurality of the axle shoulders are provided and are distributed at intervals on the axle body, and the axle shoulders have different axle diameters; Cams, wherein a plurality of cams are provided and are spaced apart on the shaft body, and the cams have different steering angles; A left transmission wheel, the left transmission wheel is relatively located at the left end of the shaft body and has an annular inner groove in the center; A right transmission wheel is located relatively at the right end of the shaft body and has a helical tooth portion on its surface.

2. The transmission camshaft according to claim 1, characterized in that: The left transmission wheel is sleeved with a roller bearing, and the inner groove is used to accommodate balls.

3. The transmission camshaft according to claim 1, characterized in that: The helical tooth portion meshes with the helical gear.

4. The transmission camshaft according to claim 1, characterized in that: The shaft head is provided with a keyway, and the keyway is matched with the gear through a key.

5. The transmission camshaft according to claim 1, characterized in that: The right transmission wheel is located at one end of the journal.

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