Gear shaft with lubrication

Abstract

The utility model provides a gear shaft with lubrication belongs to mechanical technical field. It has solved the problem of complex structure of existing gear shaft. The gear shaft with lubrication of this utility model includes the hollow axle body, the outer gear is formed on the axle body upper end, the axle body lower end is vertically equipped with a ring of keyway, the lower end inner wall of axle body has a section of taper guide surface, the guide surface and axle body coaxial arrangement, the keyway upper end extends to the guide surface, the inside wall of axle body is horizontally formed with the support block, the support block upper side is equipped with the recessed cavity, the recessed cavity bottom wall is vertically penetrated with a ring of along the axle body circumferential distribution oil hole, every oil hole is opposite the guide surface setting, the side wall of axle body is equipped with the oil injection hole of making the recessed cavity communicate with the outside of axle body. The gear shaft with lubrication of this utility model simple structure.

Description

Technical Field

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

[0002] Gear shafts are key components in mechanical transmissions, combining the functions of shafts and gears. They are mainly used to transmit motion, torque, or bending moment, while also supporting rotating parts.

[0003] An existing gear shaft, such as the hollow shaft oil supply structure disclosed in the Chinese Patent Database (application number: 202110102960.9), includes a hollow shaft with a spline at one end and multiple oil supply holes circumferentially formed on the wall surface, forming an annular oil dam inside; each of the oil supply holes is inclined towards the location of the spline in the axial section of the hollow shaft; the annular oil dam is located axially between the intersection of each of the oil supply holes and the oil supply point; wherein, the oil supply intersection point is the intersection of the axes of each of the oil supply holes in the axial section of the hollow shaft.

[0004] The above structure supplies oil to the spline position for lubrication through the oil supply hole. However, the implementation of this solution not only requires the oil injection hole to have a precise oil injection position, but also relies on an additional annular oil baffle, which makes the overall structure more complex and not conducive to processing. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a simple, lubricated gear shaft.

[0006] The objective of this utility model can be achieved through the following technical solution: a lubricated gear shaft, comprising a hollow shaft body, an external gear formed at the upper end of the shaft body, and a keyway vertically arranged at the lower end of the shaft body. The shaft body has a tapered guide surface on its lower inner wall, the guide surface being coaxial with the shaft body, and the upper end of the keyway extending to the guide surface. A support block is horizontally formed on the inner side wall of the shaft body, a cavity is provided on the upper side of the support block, and a ring of oil drain holes is vertically penetrating the bottom wall of the cavity, evenly distributed along the circumference of the shaft body, with each oil drain hole facing the aforementioned guide surface. An oil injection hole is provided on the side wall of the shaft body to connect the cavity to the outside of the shaft body.

[0007] During use, lubricating oil is injected into the cavity through the oil injection hole. The lubricating oil falls down to the guide surface through the oil drain hole and flows into the keyway along the slope of the guide surface to fully lubricate the keyway.

[0008] With the cooperation of the support block, cavity, oil drain hole and guide surface, the function of injecting lubricating oil into the keyway through the outside of the gear shaft is realized. Moreover, the component that realizes this function is completely formed on the shaft body and does not require additional parts. It has the advantages of simple structure and convenient processing.

[0009] In the aforementioned lubricated gear shaft, the lower inner wall of the shaft body also has a cylindrical downstream surface, which is coaxial with the shaft body. The diameter of the downstream surface is the same as the maximum diameter of the guide surface, and the guide surface extends upward to smoothly transition and connect with the downstream surface. During use, lubricating oil falling on the guide surface will partially splash onto the downstream surface. The downstream surface is set as a circumferential surface and vertically, allowing the splashed lubricating oil to quickly flow back into the keyway.

[0010] In the aforementioned lubricated gear shaft, the oil injection hole is straight and inclined, and the lower opening of the oil injection hole is located on the side wall of the cavity, so that the lubricating oil can enter the cavity more smoothly and facilitate operation.

[0011] In the aforementioned lubricated gear shaft, the bottom wall of the cavity is composed of a plane and a conical surface. The diameter of the conical surface gradually decreases from top to bottom, and the upper and lower sides of the conical surface are respectively connected to the side wall of the cavity and the aforementioned plane. The upper end of each oil drain hole extends to the conical surface so that the lubricating oil can enter the oil drain hole from the cavity more smoothly and improve the lubrication efficiency.

[0012] In the aforementioned lubricated gear shaft, the lower inner wall of the shaft body also has a tapered flow-gathering surface, which is coaxially arranged with the shaft body. The diameter of the flow-gathering surface gradually decreases from top to bottom, and the minimum diameter of the flow-gathering surface is the same as that of the downstream surface. The downstream surface extends upward and smoothly transitions to connect with the flow-gathering surface.

[0013] In the aforementioned lubricated gear shaft, an oil outlet hole is vertically penetrating the aforementioned plane.

[0014] Compared with existing technologies, this lubricated gear shaft has the following advantages:

[0015] 1. With the cooperation of the support block, cavity, oil drain hole and guide surface, the function of injecting lubricating oil into the keyway through the outside of the gear shaft is realized. The component that realizes this function is completely formed on the shaft body and does not require additional parts. It has the advantages of simple structure and convenient processing.

[0016] 2. When in use, some of the lubricating oil falling on the inlet surface will splash onto the downstream surface. The downstream surface is set as a circumferential surface and vertically, so that the splashed lubricating oil can quickly flow back into the keyway. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the lubricated gear shaft.

[0018] Figure 2 This is a cross-sectional schematic diagram of the lubricated gear shaft.

[0019] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0020] In the figure, 1 is the shaft; 1a is the inlet surface; 1b is the flow-in surface; 1c is the flow-gathering surface; 1d is the oil injection hole; 2 is the external gear; 3 is the keyway; 4 is the support block; 4a is the cavity; 4b is the oil drain hole; 4c is the plane; 4d is the conical surface; and 4e is the oil outlet hole. Detailed Implementation

[0021] 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.

[0022] like Figure 1 As shown, this lubricated gear shaft is an integral structure, comprising a hollow shaft body 1, wherein an external gear 2 is formed at the upper end of the shaft body 1, and the external gear 2 and the shaft body 1 are coaxially arranged. A ring of keyways 3 is vertically provided inside the lower end of the shaft body 1, and the ring of keyways 3 is evenly distributed around the circumference of the shaft body 1.

[0023] Specifically

[0024] The lower inner wall of the shaft 1 has a tapered guide surface 1a, which is coaxial with the shaft 1, and the upper end of the keyway 3 extends to the guide surface 1a. A support block 4 is horizontally formed on the inner sidewall of the shaft 1, and the outer surface of the support block 4 coincides with the inner surface of the shaft 1. For example... Figure 2 and Figure 3 As shown, the support block 4 has a cavity 4a on its upper side, and preferably the cavity 4a and the shaft 1 are coaxially arranged. A ring of oil drain holes 4b is vertically penetrating the bottom wall of the cavity 4a and evenly distributed around the circumference of the shaft 1, and each oil drain hole 4b is positioned directly opposite the aforementioned inlet surface 1a. An oil injection hole 1d is provided on the side wall of the shaft 1. The oil injection hole 1d is strip-shaped, and the two openings of the oil injection hole 1d are located on the inner side wall of the cavity 4a and the outer side wall of the shaft 1, respectively, so that the cavity 4a can be connected to the outside of the shaft 1 through the oil injection hole 1d.

[0025] In use, lubricating oil is injected into the cavity 4a through the oil injection hole 1d. The lubricating oil falls down to the guide surface 1a through the oil drain hole 4b and flows into the keyway 3 along the slope of the guide surface 1a to fully lubricate the keyway 3.

[0026] With the cooperation of the support block 4, the cavity 4a, the oil drain hole 4b and the guide surface 1a, the function of injecting lubricating oil into the keyway 3 through the outside of the gear shaft is realized. Moreover, the component that realizes this function is completely formed on the shaft body 1, without the need for additional parts, which has the advantages of simple structure and convenient processing.

[0027] To further explain, such as Figure 3As shown, the bottom wall of the cavity 4a is composed of a plane 4c and a conical surface 4d. The diameter of the conical surface 4d gradually decreases from top to bottom, and the upper and lower sides of the conical surface 4d are respectively connected to the side wall of the cavity 4a and the aforementioned plane 4c. The upper end of each oil drain hole 4b extends to the conical surface 4d so that the lubricating oil can enter the oil drain hole 4b from the cavity 4a more smoothly, thereby improving the lubrication efficiency.

[0028] The oil injection hole 1d is straight and inclined, and the lower opening of the oil injection hole 1d is located on the side wall of the cavity 4a, so that the lubricating oil can enter the cavity 4a more smoothly and facilitate operation.

[0029] like Figure 2 As shown, the lower inner wall of the shaft 1 also has a cylindrical downstream surface 1b, which is coaxial with the shaft 1. The diameter of the downstream surface 1b is the same as the maximum diameter of the inlet surface 1a, and the inlet surface 1a extends upward to smoothly transition and connect with the downstream surface 1b. In use, lubricating oil falling on the inlet surface 1a will partially splash onto the downstream surface 1b. The downstream surface 1b is set as a circumferential surface and vertically, so that the splashed lubricating oil quickly flows back into the keyway 3.

[0030] In the actual product, an oil outlet hole 4e runs vertically through the plane 4c; the lower inner wall of the shaft 1 also has a tapered flow-gathering surface 1c, which is coaxial with the shaft 1. The diameter of the flow-gathering surface 1c gradually decreases from top to bottom, and the minimum diameter of the flow-gathering surface 1c is the same as that of the downstream flow surface 1b. The downstream flow surface 1b extends upward and smoothly transitions to the flow-gathering surface 1c. In actual use, when the shaft 1 is connected to the drive shaft through the keyway 3, the lubricating oil discharged from the oil outlet hole 4e falls to the top surface of the drive shaft, then flows downward. After being accumulated by the flow-gathering surface 1c, the downstream flow surface 1b, and the guide surface 1a, it smoothly enters the keyway 3 to lubricate the meshing point between the drive shaft and the shaft 1.

[0031] 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 lubricated gear shaft, comprising a hollow shaft body (1), an external gear (2) formed at the upper end of the shaft body (1), and a keyway (3) vertically arranged inside the lower end of the shaft body (1), characterized in that, The lower end of the shaft (1) has a tapered guide surface (1a) on its inner wall. The guide surface (1a) and the shaft (1) are coaxially arranged, and the upper end of the keyway (3) extends to the guide surface (1a). A support block (4) is horizontally formed on the inner side wall of the shaft (1). A cavity (4a) is provided on the upper side of the support block (4). A ring of oil drain holes (4b) is vertically distributed around the circumference of the shaft (1) on the bottom wall of the cavity (4a), and each oil drain hole (4b) is positioned directly opposite the guide surface (1a). An oil injection hole (1d) is provided on the side wall of the shaft (1) to connect the cavity (4a) to the outside of the shaft (1).

2. The lubricated gear shaft according to claim 1, characterized in that, The lower inner wall of the shaft (1) also has a cylindrical downstream surface (1b), and the downstream surface (1b) and the shaft (1) are coaxially arranged. The diameter of the downstream surface (1b) is the same as the maximum diameter of the inlet surface (1a), and the inlet surface (1a) extends upward to smoothly transition and connect with the downstream surface (1b).

3. The lubricated gear shaft according to claim 1, characterized in that, The above-mentioned oil injection hole (1d) is straight and inclined, and the lower opening of the oil injection hole (1d) is located on the side wall of the cavity (4a).

4. The lubricated gear shaft according to claim 2, characterized in that, The bottom wall of the cavity (4a) is composed of a plane (4c) and a conical surface (4d). The diameter of the conical surface (4d) gradually decreases from top to bottom, and the upper and lower sides of the conical surface (4d) are respectively connected to the side wall of the cavity (4a) and the aforementioned plane (4c). The upper end of each oil drain hole (4b) extends to the conical surface (4d).

5. The lubricated gear shaft according to claim 4, characterized in that, The lower end of the shaft (1) has a conical converging surface (1c) on its inner wall. The converging surface (1c) and the shaft (1) are coaxially arranged. The diameter of the converging surface (1c) gradually decreases from top to bottom. The minimum diameter of the converging surface (1c) is the same as that of the downstream surface (1b). The downstream surface (1b) extends upward and smoothly transitions to the converging surface (1c).

6. The lubricated gear shaft according to claim 5, characterized in that, An oil outlet hole (4e) is vertically penetrating the aforementioned plane (4c).

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