Split type gear shaft

Abstract

The utility model provides a split type gear shaft, and belongs to the technical field of machinery. The problem that an existing gear shaft is poor in precision is solved. The split type gear shaft comprises a shaft body and a gear arranged at the upper end of the shaft body in a sleeving mode, the inner side face of the upper end of the gear is a first conical face with the diameter gradually decreasing from top to bottom, an annular connecting part is formed on the outer wall of the upper end of the shaft body, the outer side face of the connecting part is a second conical face matched with the first conical face, and the first conical face and the second conical face are attached together; a circle of cylinders are formed on the outer side face of the connecting part, round holes are axially formed in the first conical surface in a penetrating mode, the round holes and the cylinders are the same in number and are arranged in a one-to-one opposite mode, the cylinders are matched with the upper ends of the round holes in shape and size, and each cylinder is clamped in the upper end of the corresponding round hole; a threaded hole is axially formed in each cylinder, a screw is arranged in the lower end of each round hole, and the rod portion of each screw is screwed into the corresponding threaded hole so that the gear and the shaft body can be fixed together. The split type gear shaft is high in precision.

Description

Technical Field

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

[0002] The split gear shaft consists of two parts: the shaft and the gear. This design allows the gear and shaft to be replaced independently, improving the flexibility and maintainability of the transmission system.

[0003] An existing split gear shaft, such as a split gear shaft assembly disclosed in the China Patent Library (application number: 201610278104.8), comprises a first shaft body, a second shaft body and a gear; both sides of the gear are provided with assembly grooves, the first shaft body and the second shaft body are respectively arranged in the corresponding assembly grooves, and are connected into one body through a connecting piece; the first shaft body and the second shaft body are both provided with shaft heads; the two assembly grooves of the gear have the same shape; the connecting piece is a screw.

[0004] In the above-mentioned gear shaft assembly, the first shaft body, the second shaft body and the gear are fixedly connected by a circle of screws. Since the current screw fixing method has low accuracy, it is easy to cause poor coaxiality of the first shaft body, the second shaft body and the gear, affecting the transmission accuracy and working stability of the gear shaft assembly. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a split gear shaft with high transmission accuracy.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a split gear shaft, comprising a shaft body and a gear sleeved on the upper end of the shaft body, characterized in that the inner side surface of the upper end of the gear is a conical surface 1 whose diameter gradually decreases from top to bottom, and an annular connecting portion is formed on the outer wall of the upper end of the shaft body, and the outer side surface of the connecting portion is a conical surface 2 matching the conical surface 1, and the conical surface 1 and the conical surface 2 are attached together; a circle of cylinders is formed on the outer side surface of the connecting portion, and the axes of the cylinder and the shaft body are arranged in parallel; circular holes are axially penetrated on the conical surface 1, the number of circular holes and the cylinders are the same and the positions are arranged one by one, the shape and size of the cylinders are matched with the upper ends of the circular holes, and each cylinder is clamped in the upper end of the corresponding circular hole; a threaded hole is axially opened on each cylinder, a screw is provided in the lower end of each circular hole, and the screw rod is screwed into the corresponding threaded hole to fix the gear and the shaft body together.

[0007] By setting the conical surface one close to the conical surface two and a circle of cylinders respectively inserted into the corresponding circular holes, not only the contact and matching area of ​​the gear and the shaft can be greatly increased, but also the coaxiality of the gear and the shaft can be effectively enhanced, so that the gear shaft can be transmitted smoothly and accurately.

[0008] In the above-mentioned split gear shaft, the above-mentioned circular hole is composed of an upper circular hole, a lower circular hole and a middle circular hole for connecting the upper circular hole and the lower circular hole, and the apertures of the upper circular hole and the lower circular hole are larger than the middle circular hole; the cylinder is clamped in the corresponding upper circular hole; the screw head is in the lower circular hole, and the screw head is pressed against the bottom wall of the lower circular hole through an annular gasket. Hiding the screw head in the circular hole can effectively prevent it from being hit by external collisions, so that the gear shaft structure remains stable.

[0009] In the above-mentioned split gear shaft, the inner side wall of the lower end of the gear is a conical surface with a diameter gradually increasing from top to bottom, so as to reduce the weight of the gear and reduce the material input.

[0010] In the above-mentioned split gear shaft, the upper circular hole and the lower circular hole are symmetrically arranged along the center of the gear; the first cone surface and the third cone surface are also symmetrically arranged along the center of the gear, so that the gear can be installed regardless of the front and back sides, which is convenient for assembly.

[0011] In the above-mentioned split gear shaft, each upper circular hole is also provided with a rubber ring, which is sleeved outside the corresponding screw rod, and the two end surfaces of the rubber ring are respectively pressed on the bottom surface of the corresponding cylinder and the bottom surface of the corresponding upper circular hole.

[0012] In the above-mentioned split gear shaft, the screw rod portion contacts the inner wall of the rubber ring.

[0013] The rubber ring can use its own elasticity to buffer the vibration of the gear shaft during operation, thereby slowing down the loosening speed of the screw and further enhancing the structural stability of the gear shaft.

[0014] In the above-mentioned split gear shaft, the above-mentioned shaft body is an integrated structure to effectively ensure the strength and pressure resistance of the shaft body itself.

[0015] Compared with the prior art, the split gear shaft has the following advantages:

[0016] 1. By setting the conical surface 1 close to the conical surface 2 and a circle of cylinders respectively inserted into the corresponding circular holes, not only the contact and matching area of ​​the gear and the shaft body can be greatly increased, but also the coaxiality of the gear and the shaft body can be effectively enhanced, so that the gear shaft can be smoothly and accurately transmitted.

[0017] 2. The rubber ring can use its own elasticity to buffer the vibration of the gear shaft, thereby slowing down the loosening speed of the screw and further enhancing the structural stability of the gear shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the split gear shaft.

[0019] Figure 2 It is a three-dimensional schematic diagram of a gear.

[0020] Figure 3 It is a three-dimensional schematic diagram of the axis.

[0021] In the figure, 1, shaft; 1a, connecting part; 1b, cone surface 2; 1c, cylinder; 2, gear; 2a, cone surface 1; 2b, cone surface 3; 2c, upper circular hole; 2d, lower circular hole; 2e, middle circular hole; 3, screw; 4, annular gasket; 5, rubber ring. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1 As shown, the split gear shaft comprises a shaft body 1 and a gear 2 sleeved on the upper end of the shaft body 1, and the shaft body 1 and the gear 2 are coaxially arranged.

[0024] in,

[0025] The inner side surface of the upper end of the gear 2 is a conical surface 1a whose diameter gradually decreases from top to bottom. A ring-shaped connecting portion 1a is formed on the outer wall of the upper end of the shaft body 1, and the connecting portion 1a and the shaft body 1 are coaxially arranged. The outer side surface of the connecting portion 1a is a conical surface 1b matching the conical surface 1a, and the conical surface 1a 2a and the conical surface 1b are attached together. Preferably, the top surface of the connecting portion 1a is flush with the top surface of the gear 2 to effectively increase the contact area between the conical surface 1a 2a and the conical surface 1b.

[0026] like Figures 1 to 3 As shown, a circle of cylinders 1c is formed on the outer surface of the connecting portion 1a, and the circle of cylinders 1c is evenly spaced along the circumference of the connecting portion 1a. The axes of the cylinder 1c and the shaft body 1 are arranged in parallel, and a circular hole is axially penetrated on the conical surface 2a. The number of circular holes and cylinders 1c is the same and the positions are arranged one by one. The shape and size of the cylinder 1c match the upper end of the circular hole, and each cylinder 1c is clamped in the upper end of the corresponding circular hole. A threaded hole is axially opened on each cylinder 1c, and a screw 3 is provided in the lower end of each circular hole, and the rod of the screw 3 is screwed into the corresponding threaded hole to fix the gear 2 and the shaft body 1 together.

[0027] By setting the conical surface 1 2a close to the conical surface 2 1b and a circle of cylinders 1c respectively inserted into the corresponding circular holes, not only can the contact and matching area of ​​the gear 2 and the shaft 1 be greatly increased, but also the coaxiality of the gear 2 and the shaft 1 can be effectively enhanced, so that the gear 2 axis can be transmitted smoothly and accurately.

[0028] Further explanation, such as Figure 1 and Figure 2As shown, the circular hole is composed of an upper circular hole 2c, a lower circular hole 2d, and an intermediate circular hole 2e for connecting the upper circular hole 2c and the lower circular hole 2d, and the apertures of the upper circular hole 2c and the lower circular hole 2d are larger than the intermediate circular hole 2e. Among them, the cylinder 1c is clamped in the corresponding upper circular hole 2c; the head of the screw 3 is in the lower circular hole 2d, and the head of the screw 3 is pressed against the bottom wall of the lower circular hole 2d through the annular gasket 4. At this time, the annular gasket 4 is sleeved on the rod of the screw 3, and the two end faces of the annular gasket 4 are respectively pressed against the head of the screw 3 and the bottom wall of the lower circular hole 2d. Hiding the head of the screw 3 in the circular hole can effectively prevent it from being hit by external collisions, so that the shaft structure of the gear 2 remains stable.

[0029] In this embodiment, the inner side wall of the lower end of the gear 2 is a conical surface 3 2b whose diameter gradually increases from top to bottom, so as to reduce the weight of the gear 2 and reduce the material input. Preferably, the upper circular hole 2c and the lower circular hole 2d are symmetrically arranged along the center of the gear 2; the conical surface 1 2a and the conical surface 3 2b are also symmetrically arranged along the center of the gear 2, so that the gear 2 can be installed regardless of the front and back sides, which is convenient for assembly.

[0030] like Figure 1 As shown, each upper circular hole 2c is also provided with a rubber ring 5, which is sleeved on the outside of the corresponding screw 3 rod, and the screw 3 rod is in contact with the inner wall of the rubber ring 5, and the two end surfaces of the rubber ring 5 are respectively pressed on the bottom surface of the corresponding cylinder 1c and the bottom surface of the corresponding upper circular hole 2c. The rubber ring 5 can use its own elasticity to buffer the vibration of the gear 2 shaft, thereby delaying the loosening speed of the screw 3 and further enhancing the structural stability of the gear 2 shaft.

[0031] In actual products, the shaft body 1 is an integrated structure to effectively ensure the strength and compressive resistance of the shaft body 1. Preferably, the shaft body 1 is a cast integrated part.

[0032] 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 split gear shaft, comprising a shaft body (1) and a gear (2) sleeved on the upper end of the shaft body (1), characterized in that: The inner side surface of the upper end of the gear (2) is a conical surface (2a) whose diameter gradually decreases from top to bottom; the outer wall of the upper end of the shaft body (1) is formed with a ring-shaped connecting portion (1a); the outer side surface of the connecting portion (1a) is a conical surface (1b) matching the conical surface (2a), and the conical surface (2a) and the conical surface (1b) are attached together; a circle of cylinders (1c) is formed on the outer side surface of the connecting portion (1a), and the axes of the cylinders (1c) and the shaft body (1) are arranged parallel to each other. A circular hole is axially penetrated on the conical surface (2a), the number of the circular holes and the cylinder (1c) are the same and the positions are arranged opposite to each other, the shape and size of the cylinder (1c) match the upper end of the circular hole, and each cylinder (1c) is clamped in the upper end of the corresponding circular hole; each cylinder (1c) is axially opened with a threaded hole, and a screw (3) is provided in the lower end of each circular hole, and the rod of the screw (3) is screwed into the corresponding threaded hole to fix the gear (2) and the shaft (1) together.

2. The split gear shaft according to claim 1, characterized in that: The circular hole is composed of an upper circular hole (2c), a lower circular hole (2d), and a middle circular hole (2e) for connecting the upper circular hole (2c) and the lower circular hole (2d), and the diameters of the upper circular hole (2c) and the lower circular hole (2d) are both larger than the middle circular hole (2e); the cylinder (1c) is snap-fitted into the corresponding upper circular hole (2c); the head of the screw (3) is located in the lower circular hole (2d), and the head of the screw (3) is pressed tightly against the bottom wall of the lower circular hole (2d) through a ring-shaped gasket (4).

3. The split gear shaft according to claim 1, characterized in that: The inner side wall of the lower end of the gear (2) is a conical surface three (2b) whose diameter gradually increases from top to bottom.

4. The split gear shaft according to claim 3, characterized in that: The upper circular hole (2c) and the lower circular hole (2d) are symmetrically arranged along the center of the gear (2); the conical surface one (2a) and the conical surface three (2b) are also symmetrically arranged along the center of the gear (2).

5. The split gear shaft according to claim 1, characterized in that: A rubber ring (5) is also provided in each upper circular hole (2c). The rubber ring (5) is sleeved on the outside of the corresponding screw (3) rod, and the two end surfaces of the rubber ring (5) are respectively pressed on the bottom surface of the corresponding cylinder (1c) and the bottom surface of the corresponding upper circular hole (2c).

6. The split gear shaft according to claim 5, characterized in that: The rod of the screw (3) contacts the inner wall of the rubber ring (5).

7. The split gear shaft according to claim 1, characterized in that: The shaft body (1) is an integrated structure.

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