Telescopic universal joint mechanism

Abstract

The utility model relates to a mechanical connecting mechanism, in particular to a telescopic universal joint mechanism. Comprising a first universal joint fork, a cross shaft, a ball bearing, a second universal joint fork, a hollow spline shaft, an output shaft and a limiting assembly, a limiting plate is fixedly connected with the output shaft, and the output shaft is connected with the hollow spline shaft through a spline. The universal joint is designed in a telescopic mode, and the second universal joint fork, the hollow spline shaft and the input shaft are connected in a nested mode, so that the telescopic range is larger than the direct connection of the universal joint fork and the shaft by the size length of one hollow spline shaft, and the universal joint can be conveniently used by some specific vehicles; longitudinal movement and power transmission in a large range between the output shaft and the universal joint in a small installation space range are achieved.

Description

Technical Field

[0001] The invention relates to the field of agricultural machinery transmission, and in particular to a telescopic universal joint mechanism. Background Art

[0002] When the tractor is going uphill or operating on a slope, its driving stability is likely to deteriorate, the drive wheel slip rate increases, the traction efficiency decreases, and the uphill stability decreases. The tractor's traction efficiency and stability can be improved by longitudinally adjusting the tractor's center of gravity.

[0003] In a tractor, one end of the universal joint is connected to the input shaft of the travel gearbox, and the other end is connected to the output shaft of the PTO gearbox. Traditional universal joints are generally fixed in length, with poor adaptability and unable to meet the longitudinal movement requirements of the gearbox. Therefore, a retractable universal joint mechanism is used to achieve stable power transmission between the two shafts and a long distance longitudinal movement between the two gearboxes within a limited space. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a telescopic universal joint mechanism, which nestedly connects the universal joint fork No. 2, the hollow spline shaft and the input shaft to achieve a larger range of longitudinal movement and power transmission between the output shaft and the universal joint within a small installation space.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A telescopic universal joint mechanism comprises a universal joint fork No. 1, a cross shaft, a ball bearing universal joint fork No. 2, a hollow spline shaft, an output shaft and a limit assembly, wherein two universal joint forks are connected to the cross shaft through four ball bearings; and the output shaft is nestedly connected to the universal joint mechanism through a hollow spline shaft.

[0007] The hollow spline shaft is provided with splines on both the inner and outer sides, connected to the universal joint fork through the outer spline and connected to the output shaft through the inner spline, wherein a protrusion is provided on the inner side of the end connected to the output shaft, and when the output shaft is extended to a certain length, the hollow spline shaft is driven to move together.

[0008] The limiting sleeve is sleeved on the outside of the universal joint fork and the hollow spline shaft, and is connected to one end of the universal joint mechanism through two symmetrically arranged fixing pins. A protrusion is arranged on the inner side of the other end to limit the axial displacement of the hollow spline shaft when extended.

[0009] The limit plate is fixedly connected to the output shaft, and the radial dimension of the limit plate is larger than the outer diameter of the hollow spline shaft and smaller than the inner diameter of the limit sleeve, so as to contract and control the axial displacement of the hollow spline shaft.

[0010] The advantages and beneficial effects of the present invention are: the present invention adopts a telescopic design of the universal joint, the universal joint fork No. 2, the hollow spline shaft and the input shaft are nestedly connected, so that the telescopic range is more than the size length of the hollow spline shaft when the universal joint fork is directly connected to the shaft, which is convenient for use in some specific vehicles and realizes a larger range of longitudinal movement and power transmission between the output shaft and the universal joint within a small installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a telescopic universal joint mechanism of the present invention;

[0012] Figure 2 for Figure 1 A cross-sectional view of

[0013] Figure 3 It is a structural schematic diagram of the hollow spline shaft in the present invention;

[0014] In the figure: 1. Universal joint fork No. 1, 2. Cross shaft, 3. Universal joint fork No. 2, 4. Limit sleeve, 5. Output shaft, 6. Limit plate, 7. Hollow spline shaft, 8. Fixing pin, 9. Ball bearing. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, a telescopic universal joint mechanism provided by the present invention comprises a universal joint fork No. 1, a cross shaft, a ball bearing universal joint fork No. 2, a hollow spline shaft, an output shaft and a limit assembly, wherein the universal joint fork No. 1 1 and the universal joint fork No. 2 3 are rotatably connected to the cross shaft 2 through four ball bearings 9, and an internal spline is provided at the connection between the universal joint fork No. 2 and the shaft, and the output shaft is nestedly connected to the universal joint mechanism through the hollow spline shaft 7.

[0017] Furthermore, the cylindrical limiting plate 6 is fixedly connected to the output shaft 5 , and the radial dimension of the limiting plate 6 is larger than the outer diameter of the hollow spline shaft 7 and smaller than the inner diameter of the limiting sleeve 4 , and contracts to control the axial displacement of the hollow spline shaft 7 .

[0018] like Figure 2 As shown, in the example of the present invention, the limit sleeve 4 is used to limit the axial position of the hollow spline shaft 7. It is located inside the limit sleeve 4, one end of which is connected to the universal joint fork 2 3 through two symmetrically arranged fixing pins 8, and the other end is provided with a protrusion on the inner side to limit the axial displacement of the hollow spline shaft 7 when extended.

[0019] like Figure 3As shown, in the example of the present invention, splines are provided on both the inner and outer sides of the hollow spline shaft 7, and it is connected to the universal joint fork 2 3 through the external spline, so that relative sliding can be achieved during extension and retraction; it is connected to the output shaft 5 through the internal spline, wherein a protrusion is provided on the inner side of the end connected to the output shaft 5, which is used to limit the axial position of the output shaft 5 during extension.

[0020] In the example of the present invention, through the nested connection of the universal joint fork 2 3, the hollow spline shaft 7 and the output shaft 5 and the use of the limit assembly, stable transmission of power between the two shafts and a longer longitudinal displacement distance between the two shafts within a limited space can be achieved.

[0021] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A telescopic universal joint mechanism, characterized in that: The invention comprises a universal joint fork No. 1 (1), a cross shaft (2), a ball bearing (9), a universal joint fork No. 2 (3), a hollow spline shaft (7), an output shaft (5) and a limit assembly, wherein the universal joint fork No. 1 (1) and the universal joint fork No. 2 (3) are connected to the cross shaft (2) via four ball bearings (9), and the output shaft (5) is connected to the universal joint fork No. 2 (3) in a nested manner via the hollow spline shaft (7); the hollow spline shaft (7) is located inside the limit sleeve (4), and is provided with splines on both the inner and outer sides, and is connected to the universal joint fork No. 2 (3) via an outer spline, and is connected to the output shaft (5) via an inner spline, wherein a protrusion is provided on the inner side of one end connected to the output shaft (5).

2. The telescopic universal joint mechanism according to claim 1, characterized in that: The limiting assembly comprises a limiting sleeve (4) and a limiting plate (6), wherein one end of the limiting sleeve (4) is provided with a pin shaft hole, connected to one end of the universal joint mechanism via two symmetrically arranged fixing pins (8), and the other end is provided with a protruding structure on the inner side; the limiting plate (6) is fixedly connected to the upper surface of the output shaft (5), and the radial dimension of the limiting plate (6) is larger than the outer diameter of the hollow spline shaft (7) and smaller than the inner diameter of the limiting sleeve (4).

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