Hollow hydraulic motor drive shaft

Abstract

The utility model discloses a hollow type hydraulic motor drive shaft, including drive shaft body, drive shaft body includes input and output, is equipped with the second spline on the output, and the one end of input is away from the output and is equipped with the first spline, and the inside drive shaft is equipped with the stepped through -hole along the axial direction, and the through -hole includes first aperture section, second aperture section and transition section, and first aperture section is located at the input, and second aperture section is located at the output, and the diameter of first aperture section is less than the diameter of second aperture section, and transition section links first aperture section and second aperture section, and the oil circuit through -hole is set up on the output, and one end of oil circuit through -hole is communicated with transition section, the utility model discloses reasonable in structure, and the diameter of first aperture section is smaller, can strengthen the intensity of input, and the diameter of second aperture section is larger, and the external executing mechanism is convenient for connecting, and finally uses transition section to link two aperture sections, and balances the pressure difference to a certain extent through oil circuit through -hole, and strengthens the overall strength of drive shaft.

Description

Technical Field

[0001] This utility model relates to the field of drive shafts, and in particular to a hollow hydraulic motor drive shaft. Background Technology

[0002] A hydraulic motor is an actuator in a hydraulic system that converts the fluid pressure energy provided by a hydraulic pump into the mechanical energy of its output shaft. Also known as an oil motor, hydraulic motors are mainly used in injection molding machinery, ships, hoists, construction machinery, mining machinery, metallurgical machinery, marine machinery, petrochemicals, and port machinery.

[0003] The drive shaft is the component that transmits power from a hydraulic motor, and it determines the stability of power transmission. However, existing hydraulic motor drive shafts often bear significant loads, and their current designs lack sufficient strength to guarantee their service life. To address these issues, a solution is proposed below. Utility Model Content

[0004] The purpose of this invention is to provide a hollow hydraulic motor drive shaft, which has the advantages of enhancing the strength of the drive shaft and extending its service life.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A hollow hydraulic motor drive shaft includes a drive shaft body, which includes an input end and an output end. The output end is provided with a second spline, and the end of the input end away from the output end is provided with a first spline. A stepped through hole is provided axially inside the drive shaft. The through hole includes a first diameter section, a second diameter section, and a transition section. The first diameter section is located at the input end, and the second diameter section is located at the output end. The diameter of the first diameter section is smaller than the diameter of the second diameter section. The transition section connects the first diameter section and the second diameter section. A plurality of oil passage holes are opened on the output end. The plurality of oil passage holes are evenly distributed around the circumference of the output end, and all the oil passage holes are located at the keyway position of the second spline. One end of the oil passage hole communicates with the transition section.

[0007] Preferably, the second spline has 28 teeth, a module of 1.75, a major diameter of 51mm-52mm, and a minor diameter of 47mm-48mm.

[0008] Preferably, the first spline has 22 teeth, a module of 1.66, a major diameter of 40mm-41mm, and a minor diameter of 37mm-38mm.

[0009] Preferably, the diameter of the output terminal is larger than the diameter of the input terminal, and a connection angle is provided at the interface between the output terminal and the input terminal. The connection angle includes an arc portion and an inclined portion. The arc portion is connected to the input terminal, and the radius of the arc portion is 2.5mm. The lower end of the inclined portion is connected to the upper end of the arc portion, and the angle between the inclined portion and the vertical direction is 45°.

[0010] Preferably, the diameter of the transition section increases gradually, with the largest diameter on the side of the transition section closest to the second aperture section, and the oil passage is connected to the position with the largest inner diameter of the transition section.

[0011] The beneficial effects of this utility model are as follows: by setting a transition section, the diameters of the first aperture section and the second aperture section can be different, thereby increasing the wall thickness of the input end with a smaller diameter and making the drive shaft more robust. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of an embodiment;

[0013] Figure 2 for Figure 1 A magnified view of area A in the middle.

[0014] Reference numerals: 1. Drive shaft; 2. Input end; 3. Output end; 4. Second spline; 5. First spline; 6. First bore section; 7. Second bore section; 8. Transition section; 9. Oil passage hole; 10. Connecting angle; 11. Arc section; 12. Inclined section. Detailed Implementation

[0015] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model's concept should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component.

[0016] like Figure 1 and Figure 2 As shown, a hollow hydraulic motor drive shaft includes a drive shaft body 1, which includes an input end 2 and an output end 3. The diameter of the input end 2 is smaller than the diameter of the output end 3. A first spline 5 is provided at the end of the input end 2 away from the output end 3 for connecting to the power output end 3 of the hydraulic motor; a second spline 4 is provided at the output end 3 for connecting to an external actuator.

[0017] The drive shaft has a stepped through-hole consisting of three sections. The first section, 6, is located at the input end 2 and has a smaller diameter, used to enhance the torsional strength of the input end 2. The second section, 7, is located at the output end 3 and has a larger diameter, used to connect to an external actuator. Between the first section 6 and the second section 7 is a transition section 8, with the diameter of the transition section 8 increasing progressively. The diameter is smallest at the connection between the transition section 8 and the first section 6, and largest at the connection between the transition section 8 and the second section 7.

[0018] A plurality of oil passage holes 9 are provided on the output end 3, preferably 4-6 in number. The plurality of oil passage holes 9 are evenly distributed around the circumference of the output end 3 and are all located at the bottom of the keyway of the second spline 4. One end of the oil passage hole 9 leads to the position of the largest inner diameter of the transition section 8, and the other end leads to the outside of the output end 3, in order to balance the hydraulic pressure difference inside and outside the hole and enhance the durability of the drive shaft.

[0019] In this design, the spline parameters were optimized. The second spline 4 has 28 teeth, a module of 1.75, a major diameter range of 51-52 mm, and a minor diameter range of 47-48 mm; the first spline 5 has 22 teeth, a module of 1.66, a major diameter range of 40-41 mm, and a minor diameter range of 37-38 mm. These parameters match common hydraulic motor interface standards, ensuring torque transmission efficiency and space compatibility.

[0020] In this design, a connection angle 10 is provided at the connection between the output terminal 3 and the input terminal 2 to enhance the pressure that the connection can withstand. The connection angle 10 includes an arc portion 11 and an inclined portion 12. The lower end of the arc portion 11 is connected to the input terminal 2, and its radius is 2.5mm. The lower end of the inclined portion 12 is connected to the upper end of the arc portion 11, and the angle between the inclined portion 12 and the vertical direction is 45°, which is used to disperse stress concentration.

[0021] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hollow hydraulic motor drive shaft, comprising a drive shaft body (1), the drive shaft body (1) comprising an input end (2) and an output end (3), the output end (3) being provided with a second spline (4), and the input end (2) being provided with a first spline (5) at the end away from the output end (3), characterized in that, The drive shaft has a stepped through hole running through it along the axial direction. The through hole includes a first diameter section (6), a second diameter section (7), and a transition section (8). The first diameter section (6) is located at the input end (2), and the second diameter section (7) is located at the output end (3). The diameter of the first diameter section (6) is smaller than the diameter of the second diameter section (7). The transition section (8) connects the first diameter section (6) and the second diameter section (7). The output end (3) has several oil passage holes (9). The oil passage holes (9) are evenly distributed around the circumference of the output end (3), and all the oil passage holes (9) are located at the keyway position of the second spline (4). One end of the oil passage hole (9) is connected to the transition section (8).

2. The hollow hydraulic motor drive shaft according to claim 1, characterized in that, The second spline (4) has 28 teeth, the module of the second spline (4) is 1.75, the major diameter of the second spline (4) is 51mm-52mm, and the minor diameter of the second spline (4) is 47mm-48mm.

3. A hollow hydraulic motor drive shaft according to claim 1, characterized in that, The first spline (5) has 22 teeth, the first spline (5) has a module of 1.66, the major diameter of the first spline (5) is 40mm-41mm, and the minor diameter of the first spline (5) is 37mm-38mm.

4. A hollow hydraulic motor drive shaft according to claim 1, characterized in that, The diameter of the output terminal (3) is larger than the diameter of the input terminal (2). A connection angle (10) is provided at the interface between the output terminal (3) and the input terminal (2). The connection angle (10) includes an arc portion (11) and an inclined portion (12). The arc portion (11) is connected to the input terminal (2), and the radius of the arc portion (11) is 2.5 mm. The lower end of the inclined portion (12) is connected to the upper end of the arc portion (11), and the angle between the inclined portion (12) and the vertical direction is 45°.

5. A hollow hydraulic motor drive shaft according to claim 1, characterized in that, The diameter of the transition section (8) increases gradually, and the diameter of the transition section (8) is largest on the side closest to the second aperture section (7). The oil passage hole (9) is connected to the position with the largest inner diameter of the transition section (8).

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