Flexible safety connection structure of power output shaft

Abstract

The utility model discloses a power output shaft flexible safety connection structure which comprises a driven shaft, a driving shaft, a sleeve shell, a steel ball and a disc spring, a plurality of first straight hole conical grooves are formed in the front face and the back face of a driven shaft connection plate, one side of a driving shaft connection plate is a first connection face, and a plurality of second straight hole conical grooves are formed in the first connection face. One side of the sleeve shell is a second connecting face, a plurality of third straight hole conical grooves are formed in the second connecting face, a plurality of steel balls are rotationally arranged in the first straight hole conical grooves, and one ends of a plurality of disc springs abut against the steel balls. According to the utility model, the steel balls can climb out of the straight hole conical grooves and move in the grooves to play a role in safety protection when instant overload occurs or overlarge recoil torque is borne, and the steel balls climb up and down in the straight hole conical grooves to play a role in peak load shifting on the torque under the condition of no overload and when a certain torque is exceeded, so that fatigue damage of the shaft, the gear and the bearing can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of output shafts, in particular to a flexible safety connection structure of a power output shaft. Background Art

[0002] Currently, most tractor power take-off (PTO) shafts feature an involute spline design. Some, for ease of repair (replacement in the event of a breakage), split the PTO shaft into two sections, rigidly connected by flanges outside the housing. This design ignores special operating conditions and simplifies the structure. While this has the advantage of standardized broaches or hobs, it facilitates standardized manufacturing. However, the problem is that stress concentration easily forms at the spline tail, significantly reducing its torque-bearing capacity and making it susceptible to breakage.

[0003] Since the maximum torque that the clutch can transmit is usually more than twice the maximum output torque of the engine, when power is transmitted from the engine to the farm implement, it can be regarded as rigid. When the load instantaneously exceeds the maximum torque of the engine, the engine cannot be shut down immediately. At this time, the dangerous section at the key tail of the power output shaft will fatigue once. As the fatigue frequency increases, fatigue fracture occurs, which is difficult to repair.

[0004] If the PTO shaft is connected to a non-soil-engaged implement with a rotor that generates significant rotational momentum, such as a grinder, stubble destroyer, or baler, deceleration will cause a power surge from the implement to the engine. The rotor's enormous kinetic energy must be dissipated through clutch slip. The result is either a break in the PTO shaft at a critical section or damage to the clutch's secondary friction plate. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention proposes a flexible safety connection structure of a power output shaft, comprising: a driven shaft, a driving shaft, a sleeve, a steel ball and a disc spring, wherein the driven shaft comprises a driven shaft body and a driven shaft connecting plate, the two are fixedly connected, and the front and back sides of the driven shaft connecting plate are provided with a plurality of first straight hole tapered grooves, the driving shaft comprises a driving shaft body and a driving shaft connecting plate, the two are fixedly connected, one side of the driving shaft connecting plate is a first connecting surface, and the first connecting surface is provided with a plurality of second straight hole tapered grooves, and the second straight hole tapered grooves are provided when the second straight hole tapered grooves are installed. The conical grooves are aligned one by one with the first straight hole conical grooves, a through opening is opened in the center of the sleeve, one side of the sleeve is a second connecting surface, and a plurality of third straight hole conical grooves are opened on the second connecting surface. When installed, the sleeve is sleeved outside the driven shaft, and the third straight hole conical grooves are aligned one by one with the first straight hole conical grooves, a plurality of the steel balls are rotatably arranged in the first straight hole conical grooves, a plurality of the disc springs are arranged between the first connecting surface and the driven shaft connecting plate and the second connecting surface and the driven shaft connecting plate, and one end of the disc spring is in contact with the steel ball.

[0007] In addition, the flexible safety connection structure of the power output shaft proposed in the present invention may also have the following additional technical features:

[0008] Furthermore, a groove is provided on the driven shaft connecting plate, and the groove connects a plurality of the first straight hole tapered grooves.

[0009] Furthermore, the driving shaft connecting plate is provided with a plurality of first threaded holes, and the sleeve is provided with a plurality of second threaded holes, and the first threaded holes are aligned one by one with the second threaded holes.

[0010] Furthermore, the driving shaft is provided with a bolt, and the bolt is installed in the first threaded hole and the second threaded hole.

[0011] According to the flexible safety connection structure of the power output shaft of the utility model, when there is an instantaneous overload or an excessive recoil torque, the steel ball will climb out of the straight hole tapered groove and move in the groove to play a safety protection role. When there is no overload, the steel ball climbs up and down in the straight hole tapered groove, which plays the role of "cutting peaks and filling valleys" on the torque, and can also prevent fatigue damage to the shaft, gears and bearings.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0014] Figure 1 This is a structural schematic diagram of a flexible safety connection structure of a power output shaft according to one embodiment of the present utility model;

[0015] Figure 2 This is a structural schematic diagram of a driven shaft of a power output shaft flexible safety connection structure according to one embodiment of the present utility model;

[0016] Figure 3 This is a structural schematic diagram of a driving shaft of a power output shaft flexible safety connection structure according to an embodiment of the present utility model;

[0017] Figure 4 This is a structural schematic diagram of a housing of a flexible safety connection structure for a power output shaft according to an embodiment of the present utility model;

[0018] Figure 5 This is a schematic diagram of the internal structure of a flexible safety connection structure of a power output shaft according to one embodiment of the present utility model;

[0019] As shown in the figure:

[0020] 1. Driven shaft; 11. Driven shaft body; 12. Driven shaft connecting plate; 121. First straight hole tapered groove; 122. Groove; 2. Driving shaft; 21. Driving shaft body; 22. Driving shaft connecting plate; 221. First connecting surface; 2211. Second straight hole tapered groove; 222. First threaded hole; 23. Bolt; 3. Housing; 31. Through port; 32. Second connecting surface; 321. Third straight hole tapered groove; 33. Second threaded hole; 4. Steel ball; 5. Disc spring. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] A flexible safety connection structure for a power take-off shaft according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023] like Figures 1 to 5 As shown, a flexible safety connection structure of a power output shaft of an embodiment of the present utility model may include a driven shaft 1, a driving shaft 2, a sleeve 3, a steel ball 4 and a disc spring 5.

[0024] Among them, the driven shaft 1 includes a driven shaft body 11 and a driven shaft connecting plate 12, which are fixedly connected. Several first straight hole tapered grooves 121 are opened on both the front and back sides of the driven shaft connecting plate 12. The driven shaft connecting plate 12 is also provided with a groove 122, which connects the several first straight hole tapered grooves 121.

[0025] It should be noted that the groove 122 can provide a range of movement for the steel ball 4, thereby facilitating the release of torque and ensuring the safety of the device.

[0026] The driving shaft 2 includes a driving shaft body 21 and a driving shaft connecting plate 22, which are fixedly connected. One side of the driving shaft connecting plate 22 is a first connecting surface 221, and a plurality of second straight hole tapered grooves 2211 are opened on the first connecting surface 221. When installed, the second straight hole tapered grooves 2211 are aligned one by one with the first straight hole tapered grooves 121.

[0027] It should be noted that the second straight hole tapered groove 2211 and the first straight hole tapered groove 121 can facilitate installation.

[0028] The driving shaft connecting plate 22 is further provided with a plurality of first threaded holes 222 , and the housing 3 is further provided with a plurality of second threaded holes 33 . The first threaded holes 222 are aligned one by one with the second threaded holes 33 . The driving shaft 2 is further provided with bolts 23 , which are installed in the first threaded holes 222 and the second threaded holes 33 .

[0029] It should be noted that the first threaded hole 222 and the second threaded hole 33 can connect the various components of the device together to ensure the stability of the device.

[0030] A through opening 31 is provided in the center of the sleeve 3, and one side of the sleeve 3 is a second connecting surface 32. A plurality of third straight hole tapered grooves 321 are provided on the second connecting surface 32. When installed, the sleeve 3 is sleeved outside the driven shaft 1, and the third straight hole tapered grooves 321 are aligned one by one with the first straight hole tapered grooves 121.

[0031] It should be noted that the housing 3 can reduce the pressure on the driven shaft 1 and further ensure the safety of the device.

[0032] Several steel balls 4 are rotatably arranged in the first straight hole tapered groove 121 , and several disc springs 5 ​​are arranged between the first connecting surface 221 and the driven shaft connecting plate 12 and the second connecting surface 32 and the driven shaft connecting plate 12 , and one end of the disc spring 5 is in contact with the steel ball 4 .

[0033] It should be noted that the steel ball 4 cooperates with the disc spring 5 to realize a flexible overload protection connection, thereby solving the problem of either the power output shaft breaking or the secondary clutch plate burning out during the reverse power transmission (from the farm implement to the engine).

[0034] Specifically, when performing related work, the installation work is carried out first, the driven shaft 1 and the driving shaft 2 are placed side by side, the second straight hole tapered groove 2211 is aligned one by one with the first straight hole tapered groove 121, and the driven shaft body 11 and the driving shaft body 21 are placed back to back, then the sleeve 3 is placed on the outside of the driven shaft 1, and the first threaded hole 222 and the second threaded hole 33 are aligned one by one, and the third straight hole tapered groove 321 and the first straight hole tapered groove 121 are aligned one by one.

[0035] Then place the steel ball 4 in the first straight hole tapered groove 121 , and place the disc spring 5 in the second straight hole tapered groove 2211 and the third straight hole tapered groove 321 respectively, and abut against the steel ball 4 , and finally install the bolt 23 in the first threaded hole 222 and the second threaded hole 33 .

[0036] During operation, the driving shaft 2 drives the driven shaft 1 to rotate, thereby outputting power. Under no-overload conditions, the steel ball 4 moves up and down in the first straight hole tapered groove 121. When there is a transient overload or excessive backlash torque, the steel ball 4 moves out of the first straight hole tapered groove 121 and moves in the groove 122 of the driven shaft connecting plate 12, reducing pressure.

[0037] In summary, according to a flexible safety connection structure of a power output shaft in an embodiment of the utility model, when there is an instantaneous overload or an excessive recoil torque, the steel ball will climb out of the straight hole conical groove and move in the groove, playing a safety protection role. When there is no overload, the steel ball climbs up and down in the straight hole conical groove, which plays a role of "peak cutting and valley filling" for the torque, and can also prevent fatigue damage to the shaft, gears, and bearings.

[0038] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A flexible safety connection structure for a power output shaft, characterized in that: include: A driven shaft (1), a driving shaft (2), a housing (3), a steel ball (4) and a disc spring (5), wherein: The driven shaft (1) comprises a driven shaft body (11) and a driven shaft connecting plate (12), which are fixedly connected. The driven shaft connecting plate (12) is provided with a plurality of first straight hole tapered grooves (121) on both the front and back sides. The driving shaft (2) comprises a driving shaft body (21) and a driving shaft connecting plate (22), which are fixedly connected. One side of the driving shaft connecting plate (22) is a first connecting surface (221). The first connecting surface (221) is provided with a plurality of second straight hole tapered grooves (2211). During installation, the second straight hole tapered grooves (2211) are aligned one by one with the first straight hole tapered grooves (121). The sleeve (3) has a through opening (31) at its center, one side of the sleeve (3) is a second connecting surface (32), and a plurality of third straight hole tapered grooves (321) are formed on the second connecting surface (32). When installed, the sleeve (3) is sleeved outside the driven shaft (1), and the third straight hole tapered grooves (321) are aligned one by one with the first straight hole tapered grooves (121). A plurality of the steel balls (4) are rotatably arranged in the first straight hole tapered groove (121); The plurality of disc springs (5) are arranged between the first connecting surface (221) and the driven shaft connecting plate (12) and the second connecting surface (32) and the driven shaft connecting plate (12), and one end of the disc spring (5) is in contact with the steel ball (4).

2. A power take-off shaft flexible safety connection structure according to claim 1, characterized in that: A groove (122) is also provided on the driven shaft connecting plate (12), and the groove (122) connects the plurality of first straight hole tapered grooves (121).

3. A power take-off shaft flexible safety connection structure according to claim 2, characterized in that: The driving shaft connecting plate (22) is further provided with a plurality of first threaded holes (222), and the sleeve (3) is further provided with a plurality of second threaded holes (33), wherein the first threaded holes (222) are aligned one by one with the second threaded holes (33).

4. A power take-off shaft flexible safety connection structure according to claim 3, characterized in that: The driving shaft (2) is further provided with a bolt (23), and the bolt (23) is installed in the first threaded hole (222) and the second threaded hole (33).

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