Combined gear shaft

Abstract

The utility model provides a combined gear shaft, and belongs to the technical field of machinery. The problem that an existing gear shaft is inconvenient to assemble is solved. The combined gear shaft comprises a shaft body and a cam, a shaft hole allowing the front end of the shaft body to penetrate through is formed in the cam, and a bevel gear is integrally formed on the outer wall of the front end of the shaft body; a section of internal thread is formed on the inner wall of the shaft hole, and an external thread meshed with the internal thread is formed on the outer wall of the shaft body; a protruding ring coaxial with the shaft hole is arranged on the rear end face of the cam, an annular filling groove is formed among the protruding ring, the shaft body and the cam, and an annular plastic ring enabling the shaft body and the cam to be fixed into a whole is formed in the filling groove in an injection molding mode. The combined gear shaft is convenient to assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a gear shaft, in particular to a combined gear shaft. Background Art

[0002] Camshaft generally refers to a camshaft with gears or teeth.

[0003] The above-mentioned cam gear shaft is a composite camshaft disclosed in the Chinese Patent Library (application number: 201420077079.3), which includes a camshaft, two cams are arranged on the camshaft, one is used as an intake cam, and the other is used as an exhaust cam. Bearings are sleeved at both ends of the camshaft, and one end is fixedly connected to a driving gear. An axial hole is provided on the cam, and the hole diameter is larger than the outer diameter of the camshaft. Four inlay grooves are opened on the inner wall of the axial hole, and the intervals between the inlay grooves are ninety degrees. After the camshaft is sleeved with the axial hole, the diameter is expanded, and the outer wall part of the camshaft is pressed into the inlay groove to form a fixed block with a raised limit for circumferential fixation. The part of the camshaft on both sides of the cam is raised to form an axial limit groove to clamp the cam on the camshaft.

[0004] In the above camshaft, the driving gear is fixed to one end of the camshaft, one side of the cam is pressed on one of the limit grooves, and the cam is clamped by being inserted into the other limit groove. The above assembly process has many steps and is cumbersome, which is inconvenient to assemble. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a combined gear shaft that is easy to assemble.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a combined gear shaft, including a shaft body and a cam, the cam is provided with a shaft hole for the front end of the shaft body to pass through, characterized in that a bevel gear is integrally formed on the outer wall of the front end of the shaft body; an internal thread is formed on the inner wall of the shaft hole, and an external thread meshing with the internal thread is formed on the outer wall of the shaft body; a convex ring coaxial with the shaft hole is provided on the rear end face of the cam, an annular filling groove is formed between the convex ring, the shaft body and the cam, and an annular plastic ring is injection molded in the filling groove to fix the shaft body and the cam as a whole.

[0007] During assembly, the shaft body is simply screwed into the shaft hole, and then plastic is injected into the filling groove to form a plastic ring so that the shaft body and the cam can be stably connected together, thereby simplifying the assembly steps and making the entire assembly more convenient.

[0008] The shaft and the cam are connected by both threads and plastic rings, making the connection between the shaft and the cam both rigid and tough, effectively enhancing the connection strength and stability between the two.

[0009] In the above-mentioned combined gear shaft, the above-mentioned shaft hole is composed of a tapered hole and a threaded hole, and the tapered hole is located in front of the threaded hole; the above-mentioned internal thread is arranged in the threaded hole, the diameter of the tapered hole gradually decreases from front to back, and a tapered surface 1 matching the tapered hole is formed on the outer wall of the shaft body, and the tapered surface 1 is attached to the inner wall of the tapered hole. The cooperation between the tapered surface 1 and the tapered hole can not only limit the installation position of the shaft body, so that the shaft body can be screwed into place at one time, which is convenient for assembly, but also can forcibly correct the connection accuracy of the shaft body and the shaft hole, enhance the coaxiality of the shaft body and the shaft hole, and improve the transmission stability and accuracy of the gear shaft.

[0010] In the above-mentioned combined gear shaft, the front side of the tapered hole 1 extends to the rear end face of the bevel gear, so that the bevel gear can obtain stronger support, thereby improving the transmission accuracy and stability.

[0011] In the above-mentioned combined gear shaft, the inner side surface of the convex ring is a conical surface 2 whose diameter gradually increases from front to back. The conical surface 2 plays a guiding role, so that the plastic liquid is evenly filled in the filling groove, and the connection between the shaft body and the cam is strengthened.

[0012] In the above-mentioned combined gear shaft, an annular groove coaxial with the shaft body is provided on the outer wall of the shaft body, and the plastic ring extends into the annular groove to form an annular convex portion matching the annular groove. Under the action of the annular convex portion, the axial connection strength between the gear shaft and the cam can be strengthened, so that the cam and the shaft body are more stably connected.

[0013] In the above-mentioned combined gear shaft, the axial cross-section of the annular groove is in the shape of an arc, so that the annular protrusion is more stably formed.

[0014] In the above-mentioned combined gear shaft, there are at least two annular grooves distributed along the axial direction of the shaft body to further enhance the connection stability between the cam and the shaft body.

[0015] In the above-mentioned combined gear shaft, the cam and the convex ring are an integrated structure.

[0016] Compared with the prior art, this combined gear shaft has the following advantages:

[0017] 1. During assembly, just screw the shaft into the shaft hole, and then inject plastic into the filling groove to form a plastic ring so that the shaft and the cam can be stably connected together, thereby simplifying the assembly steps and making the entire assembly more convenient.

[0018] 2. The shaft and the cam are connected by both threads and plastic rings, making the connection between the shaft and the cam both rigid and tough, effectively enhancing the connection strength and stability between the two.

[0019] 3. The combination of the conical surface and the conical hole can not only limit the installation position of the shaft body, so that the shaft body can be screwed into place at one time for easy assembly, but also can forcibly correct the connection accuracy between the shaft body and the shaft hole, enhance the coaxiality of the shaft body and the shaft hole, and improve the stability and accuracy of the gear shaft transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the combined gear shaft.

[0021] Figure 2 It is a cross-sectional schematic diagram of the combined gear shaft.

[0022] Figure 3 It is a cross-sectional schematic diagram of the cam.

[0023] In the figure, 1, shaft body; 1a, bevel gear; 1b, cone surface one; 2, cam; 2a, convex ring; 2a1, cone surface two; 2b, threaded hole; 2c, cone hole; 3, plastic ring; 3a, annular convex part. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 As shown, the combined gear shaft includes a shaft body 1 and a cam 2, and preferably the shaft body 1 and the cam 2 are both made of metal material.

[0026] in,

[0027] like Figure 1 and Figure 3 As shown, the cam 2 is provided with an axial hole for the front end of the shaft body 1 to pass through, and a bevel gear 1a is integrally formed on the outer wall of the front end of the shaft body 1, and the bevel gear 1a and the shaft body 1 are coaxially arranged. In the actual product, the diameter of the bevel teeth of the bevel gear 1a gradually increases from front to back. An internal thread is formed on the inner wall of the axial hole, and an external thread that meshes with the internal thread is formed on the outer wall of the shaft body 1. A convex ring 2a coaxial with the axial hole is provided on the rear end face of the cam 2, and an annular filling groove is formed between the convex ring 2a, the shaft body 1 and the cam 2, and the filling groove is coaxially arranged with the shaft body 1. An annular plastic ring 3 is injection molded in the filling groove to fix the shaft body 1 and the cam 2 as a whole.

[0028] During assembly, the shaft body 1 only needs to be screwed into the shaft hole, and then plastic is injected into the filling groove to form the plastic ring 3 so that the shaft body 1 and the cam 2 can be stably connected together, thereby simplifying the assembly steps and making the entire assembly more convenient.

[0029] The shaft body 1 and the cam 2 are connected by both threads and plastic rings 3, so that the connection between the shaft body 1 and the cam 2 has both rigidity and toughness, effectively enhancing the connection strength and stability between the two.

[0030] Further explanation, such as Figure 2 and Figure 3As shown, the shaft hole is composed of a connected tapered hole 2c and a threaded hole 2b, and the tapered hole 2c is located in front of the threaded hole 2b. The internal thread is arranged in the threaded hole 2b; the diameter of the tapered hole 2c gradually decreases from front to back, and a tapered surface 1b matching the tapered hole 2c is formed on the outer wall of the shaft body 1, and the tapered surface 1b is attached to the inner wall of the tapered hole 2c. The cooperation between the tapered surface 1b and the tapered hole 2c can not only limit the installation position of the shaft body 1, so that the shaft body 1 can be screwed into place at one time, which is convenient for assembly, but also can force the connection accuracy of the shaft body 1 and the shaft hole to be corrected, enhance the coaxiality of the shaft body 1 and the shaft hole, and improve the transmission stability and accuracy of the gear shaft. It is preferred that the front side of the tapered hole 2c extends to the rear end face of the bevel gear 1a, so that the bevel gear 1a can obtain stronger support and improve the transmission accuracy and stability.

[0031] like Figure 2 and Figure 3 As shown, the inner side of the convex ring 2a is a conical surface 2a1 whose diameter gradually increases from front to back. The conical surface 2a1 plays a guiding role, so that the plastic liquid is evenly filled in the filling groove, and the connection between the shaft body 1 and the cam 2 is strengthened. An annular groove coaxial with the shaft body 1 is provided on the outer wall of the shaft body 1, and the plastic ring 3 extends into the annular groove to form an annular convex portion 3a matching the annular groove. Under the action of the annular convex portion 3a, the axial connection strength between the gear shaft and the cam 2 can be strengthened, so that the cam 2 and the shaft body 1 are more stably connected. Preferably, the axial cross-section of the annular groove is in the shape of a circular arc, so that the annular convex portion 3a is more stably formed. There are at least two annular grooves and they are distributed axially along the shaft body 1 to further enhance the connection stability between the cam 2 and the shaft body 1.

[0032] In actual products, the cam 2 and the convex ring 2a are an integrated structure, and preferably the cam 2 and the convex ring 2a are integrally formed by casting.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A combined gear shaft, comprising a shaft body (1) and a cam (2), wherein the cam (2) is provided with a shaft hole for the front end of the shaft body (1) to pass through, characterized in that: A bevel gear (1a) is integrally formed on the outer wall of the front end of the shaft body (1); an internal thread is formed on the inner wall of the shaft hole, and an external thread meshing with the internal thread is formed on the outer wall of the shaft body (1); a convex ring (2a) coaxial with the shaft hole is provided on the rear end surface of the cam (2); an annular filling groove is formed between the convex ring (2a), the shaft body (1) and the cam (2); an annular plastic ring (3) is injection-molded in the filling groove for fixing the shaft body (1) and the cam (2) as a whole.

2. The combined gear shaft according to claim 1, characterized in that: The shaft hole is composed of a tapered hole (2c) and a threaded hole (2b), and the tapered hole (2c) is located in front of the threaded hole (2b); the internal thread is arranged in the threaded hole (2b), the diameter of the tapered hole (2c) gradually decreases from front to back, and a tapered surface (1b) matching the tapered hole (2c) is formed on the outer wall of the shaft body (1), and the tapered surface (1b) is attached to the inner wall of the tapered hole (2c).

3. The combined gear shaft according to claim 2, characterized in that: The front side of the tapered hole (2c) extends to the rear end surface of the bevel gear (1a).

4. The combined gear shaft according to claim 1, characterized in that: The inner side surface of the convex ring (2a) is a conical surface 2 (2a1) whose diameter gradually increases from front to back.

5. The combined gear shaft according to claim 4, characterized in that: An annular groove coaxial with the shaft body (1) is provided on the outer wall of the shaft body (1), and the plastic ring (3) extends into the annular groove to form an annular convex portion (3a) matching the annular groove.

6. The combined gear shaft according to claim 5, characterized in that: The axial cross section of the annular groove is in the shape of a circular arc.

7. The combined gear shaft according to claim 5 or 6, characterized in that: There are at least two annular grooves distributed axially along the shaft body (1).

8. The combined gear shaft according to claim 1, characterized in that: The cam (2) and the convex ring (2a) are an integrated structure.

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