A combined drive gear

Abstract

The utility model provides a combined transmission gear belongs to mechanical technical field. It has solved the problem of complex gear structure. The combined transmission gear of this utility model includes two cylinder bodies, and the two cylinder bodies are coaxial and symmetrically arranged, and the inner sides of the distal ends of the two cylinder bodies are both formed with gear rings, and the cylinder body is provided with a ring of through holes which penetrate axially, the through holes are step holes, the through holes are composed of large holes and small holes which are connected, the two large holes are between the two small holes, and a same screw rod is arranged in the two through holes which are arranged in position correspondence, and the two ends of each screw rod are both connected with nuts in screw threads, and the nuts are pressed on the corresponding cylinder body; the outer wall of the middle part of the screw rod is provided with a ring-shaped connecting seat, and the two ends of the connecting seat are respectively inserted into the corresponding two large holes; the wall of the large hole is provided with a taper surface one; on the same cylinder body, the diameter of the taper surface gradually decreases from the large hole to the small hole; the outer walls of the two ends of the connecting seat are both provided with taper surfaces two, and the taper surface one is tightly attached to the corresponding taper surface two. The combined transmission gear has simple structure.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a transmission gear, particularly a combined transmission gear. Background Technology

[0002] Transmission gears are the core components in mechanical systems that enable power transmission, speed change, or change of motion direction.

[0003] An existing transmission gear assembly, such as the one previously proposed by the applicant (application number: 202421122521.X), includes two coaxially arranged cylindrical bodies with adjacent end faces touching each other. Gear rings are formed on the inner sides of the distant ends of the two cylindrical bodies. Gear shafts are inserted into both cylindrical bodies, and each gear shaft meshes with a gear ring. The two cylindrical bodies are fixed together by a bolt and nut assembly, which includes bolts. Each cylindrical body has through holes through which the bolt shank passes. The number of through holes on each cylindrical body is the same as the number of bolts, and their positions correspond one-to-one. The through holes are characterized by being stepped holes, with two corresponding through holes on the two cylindrical bodies arranged symmetrically. Each through hole consists of a large hole and a small hole connected together, with the large holes positioned between the two small holes. The large holes are circular, and the same annular body is fitted inside each of the two corresponding holes. The shape and size of the annular body match the large hole, and the annular body fits around the corresponding bolt shank.

[0004] The aforementioned gear assembly requires additional machining of rings, and each ring needs to be pressed into the corresponding through hole. This not only results in more parts but also makes the installation process more complicated and difficult to assemble. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a simplified combined transmission gear.

[0006] The objective of this utility model can be achieved through the following technical solution: A combined transmission gear includes two cylindrical bodies with identical structures, coaxially arranged and symmetrically positioned. Gear rings are formed on the inner sides of the distant ends of the two cylindrical bodies. Each cylindrical body has a ring of axially penetrating through holes, which are stepped holes composed of interconnected large and small holes, with the large holes positioned between the two small holes. The key feature is that the same screw rod passes through the two corresponding through holes, and each screw rod has a nut threaded to both ends, with the nuts pressed against the corresponding cylindrical body. The outer wall of the middle portion of the screw rod has an annular connecting seat that matches the large hole, and both ends of the connecting seat are respectively inserted into the corresponding large holes. The wall of the large hole has a conical surface (I). On the same cylindrical body, the diameter of the conical surface (I) gradually decreases from the large hole to the small hole. The outer walls of both ends of the connecting seat have conical surfaces (II) that match the conical surface (I), and the conical surface (I) is tightly attached to the corresponding conical surface (II).

[0007] By using the combination of conical surface one and conical surface two, the relative position of the two cylinders is forcibly corrected, effectively improving the coaxiality of the two cylinders and enhancing the transmission accuracy.

[0008] Conical surface one is formed on the cylinder, and conical surface two is formed on the screw. That is, the screw and cylinder only need to rely on their own structure to achieve the purpose of improving the coaxiality of the two cylinders, thereby reducing the input of parts and achieving simple structure, reduced cost and convenient assembly.

[0009] In the aforementioned combined transmission gear, an annular rubber pad is clamped between the two cylinders. The rubber pad and the cylinders are coaxially arranged, and the screw is located outside the rubber pad. In actual products, due to limitations in machining accuracy, there may be gaps at the adjacent ends of the two cylinders. The annular rubber pad clamped between the two cylinders creates a circumferentially closed space between the rubber pad and the two cylinders, providing waterproofing and dustproofing.

[0010] Meanwhile, the rubber pads also provide a certain degree of cushioning, thereby improving the structural stability and transmission accuracy of the transmission gears.

[0011] In the aforementioned combined transmission gear, annular positioning grooves are formed on the adjacent end faces of the two cylinders, and an annular groove for accommodating a rubber pad is formed between the two positioning grooves. The two end faces of the rubber pad are respectively pressed against the bottom surfaces of the two annular grooves. This design facilitates assembly.

[0012] In the aforementioned combined transmission gear, a ring-shaped metal skeleton is embedded within the rubber pad, and the metal skeleton and the rubber pad are coaxially arranged. Embedding the metal skeleton within the rubber pad enhances its compressive strength and improves its sealing power.

[0013] In the aforementioned combined transmission gear, the rubber pad and the metal frame are formed into a single unit through injection molding.

[0014] In the aforementioned combined transmission gear, annular mounting grooves are provided on both the inner and outer walls of the metal frame, and the mounting grooves and the metal frame are coaxially arranged; the rubber pad extends into the mounting groove to form annular protrusions that match the mounting grooves, and each mounting groove is provided with the aforementioned annular protrusions to enhance the bonding strength and stability between the metal frame and the rubber pad.

[0015] Compared with existing technologies, this combined transmission gear has the following advantages: 1. By using the combination of conical surface one and conical surface two, the relative position of the two cylinders is forcibly corrected, effectively improving the coaxiality of the two cylinders and improving the transmission accuracy.

[0016] 2. Conical surface one is formed on the cylinder, and conical surface two is formed on the screw. That is, the screw and cylinder can improve the coaxiality of the two cylinders by relying on their own structure, thereby reducing the input of parts and achieving simple structure, reduced cost and convenient assembly.

[0017] 3. Embedding a metal skeleton inside the rubber gasket can enhance its compressive strength and improve its sealing strength. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the combined transmission gear.

[0019] Figure 2 This is a cross-sectional schematic diagram of the combined transmission gear.

[0020] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0021] Figure 4 This is a cross-sectional view of the screw.

[0022] In the figure, 1 is the cylinder; 1a is the gear ring; 1b is the through hole; 1b1 is the large hole; 1b2 is the first conical surface; 2 is the screw; 2a is the connecting seat; 2b is the second conical surface; 3 is the nut; 4 is the rubber pad; 4a is the annular protrusion; 5 is the positioning groove; and 6 is the metal frame. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, this combined transmission gear includes two identical cylinders 1, which are coaxially arranged and symmetrically positioned along their distribution centers. In the actual product, the axial cross-section of the outer wall of the cylinder 1 is approximately L-shaped, and gear rings 1a are formed on the inner sides of the far ends of the two cylinders 1, and the gear rings 1a are coaxially arranged with the cylinders 1.

[0025] Specifically like Figures 2 to 4As shown, the cylinder 1 has a ring of axially penetrating through holes 1b, which are evenly distributed around the circumference of the cylinder 1. The through holes 1b are stepped holes, consisting of interconnected large holes 1b1 and small holes, with the two large holes 1b1 positioned between the two small holes. A single screw 2 passes through the two corresponding through holes 1b, and each screw 2 has a nut 3 threaded to both ends, which are pressed against the corresponding cylinder 1. The outer wall of the middle section of the screw 2 has an annular connecting seat 2a that matches the large hole 1b1. The connecting seat 2a and the screw 2 are an integral structure, with both ends of the connecting seat 2a inserted into the corresponding two large holes 1b1. The wall of the large hole 1b1 has a conical surface 1b2, which is coaxially arranged with the corresponding through hole 1b. In the two large holes 1b1 at corresponding positions, the two conical surfaces 1b2 are symmetrically arranged along their distribution centers. On the same cylinder 1, the diameter of the conical surface 1b2 gradually decreases from the large hole 1b1 towards the small hole. Both ends of the connecting seat 2a have conical surfaces 2b that match the conical surface 1b2, and the conical surface 1b2 is tightly attached to the corresponding conical surface 2b. Through the cooperation of the conical surfaces 1b2 and 2b, the relative position of the two cylinders 1 is forcibly corrected, effectively improving the coaxiality of the two cylinders 1 and enhancing transmission accuracy.

[0026] Conical surface 1b2 is formed on cylinder 1, and conical surface 2b is formed on screw 2. That is, screw 2 and cylinder 1 can improve the coaxiality of the two cylinders 1 by relying on their own structure, thereby reducing the input of parts and achieving simple structure, reduced cost and convenient assembly.

[0027] like Figure 2 and Figure 3 As shown, an annular rubber pad 4 is clamped between the two cylinders 1. The rubber pad 4 and the cylinder 1 are coaxially arranged, and the aforementioned screw 2 is located outside the rubber pad 4. In actual products, due to limitations in processing precision, there may be gaps at the adjacent ends of the two cylinders 1. The annular rubber pad 4 clamped between the two cylinders 1 creates a circumferentially closed space between the rubber pad 4 and the two cylinders 1, which serves to provide waterproofing and dustproofing.

[0028] Meanwhile, the rubber pad 4 also provides a certain buffering effect, thereby improving the structural stability and transmission accuracy of the transmission gear.

[0029] The specific installation method of the rubber pad 4 is as follows: A ring-shaped positioning groove 5 is provided on the adjacent end faces of the two cylinders 1, and the positioning groove 5 and the cylinder 1 are coaxially arranged. An annular groove for accommodating the rubber pad 4 is formed between the two positioning grooves 5, and the two end faces of the rubber pad 4 are respectively pressed against the bottom surfaces of the two annular grooves.

[0030] To further explain, a ring-shaped metal skeleton 6 is embedded within the rubber gasket 4, and the metal skeleton 6 and the rubber gasket 4 are coaxially arranged. Embedding the metal skeleton 6 within the rubber gasket 4 enhances its compressive strength and improves its sealing power. Preferably, the rubber gasket 4 and the metal skeleton 6 are formed into a single unit through injection molding.

[0031] In the actual product, the inner and outer walls of the metal frame 6 are provided with annular mounting grooves, and the mounting grooves and the metal frame 6 are coaxially arranged; the rubber pad 4 extends into the mounting groove to form annular protrusions 4a that match the mounting groove, and each mounting groove is provided with the aforementioned annular protrusions 4a to enhance the bonding strength and stability between the metal frame 6 and the rubber pad 4. Preferably, the axial cross-section of the annular protrusions 4a is arc-shaped.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A combined transmission gear, comprising two cylindrical bodies (1) with identical structures, the two cylindrical bodies (1) being coaxial and symmetrically arranged, each having a gear ring (1a) formed on the inner side of its far ends, and each cylindrical body (1) having a through hole (1b) extending axially through it, the through hole (1b) being a stepped hole, the through hole (1b) being composed of a large hole (1b1) and a small hole connected together, with the large hole (1b1) located between the two small holes, characterized in that, The same screw (2) is inserted into the two through holes (1b) set at the corresponding positions. Each screw (2) has a nut (3) threaded to both ends, and the nut (3) is pressed on the corresponding cylinder (1). The middle outer wall of the screw (2) has a ring-shaped connecting seat (2a) that matches the large hole (1b1), and the two ends of the connecting seat (2a) are respectively inserted into the corresponding two large holes (1b1). The hole wall of the large hole (1b1) has a section of conical surface one (1b2). On the same cylinder (1), the diameter of conical surface one (1b2) gradually decreases from the large hole (1b1) to the small hole. The outer walls of both ends of the connecting seat (2a) have conical surface two (2b) that matches conical surface one (1b2), and conical surface one (1b2) is close to the corresponding conical surface two (2b).

2. The combined transmission gear according to claim 1, characterized in that, A ring-shaped rubber pad (4) is clamped between the two cylinders (1). The rubber pad (4) and the cylinder (1) are coaxially arranged, and the screw (2) is located outside the rubber pad (4).

3. The combined transmission gear according to claim 2, characterized in that, Annular positioning grooves (5) are provided on the adjacent end faces of the two cylinders (1). An annular groove for accommodating the rubber pad (4) is formed between the two positioning grooves (5), and the two end faces of the rubber pad (4) are pressed against the bottom surfaces of the two annular grooves respectively.

4. The combined transmission gear according to claim 3, characterized in that, A ring-shaped metal skeleton (6) is embedded in the rubber pad (4), and the metal skeleton (6) and the rubber pad (4) are coaxially arranged.

5. The combined transmission gear according to claim 4, characterized in that, The rubber pad (4) and the metal skeleton (6) are formed into a whole by injection molding.

6. The combined transmission gear according to claim 1, characterized in that, The inner and outer walls of the metal frame (6) are provided with annular mounting grooves, and the mounting grooves and the metal frame (6) are coaxially arranged; the rubber pad (4) extends into the mounting groove to form annular protrusions (4a) that match the mounting groove, and each mounting groove is provided with the above-mentioned annular protrusions (4a).

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