Transmission shaft with anti-fracture structure

Abstract

The utility model discloses a transmission shaft with an anti-fracture structure, which relates to the field of transmission shafts and comprises a first spline fork, a second spline fork and a spline shaft, a fork portion of the first spline fork is in transmission connection with a fork portion of the second spline fork through a cross shaft, and an external spline B is arranged at one end of the spline shaft and used for being inserted into an internal spline B of the second spline fork. The other end of the spline shaft is provided with external threads for connecting a belt pulley mounting interface; the internal spline A of the first spline fork is used for being matched with an external spline A on a gearbox installation connector, and spline transmission is achieved. The process of welding seam connection is omitted, and the problem that a welding seam is broken under the working condition that the welding seam bears extra bending moment force is solved. The spline shaft is connected with the spline fork, the bolt is tightened and fixed, weld joints are omitted, weld joint breakage and failure are avoided, and after-sales three-pack breakage faults are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of transmission shaft, concretely relates to a breakage prevention structure transmission shaft. BACKGROUND

[0002] As Figure 1 The transmission shaft of the existing structure is applied to the transmission device of agricultural machinery, one end of the transmission shaft is connected with a gearbox, and the other end is connected with a belt pulley. The internal structure of the transmission shaft assembly adopts a welding process mode, one end of a solid shaft (5') is welded with a welding fork (3'), the other end of the solid shaft is welded with a shaft head (6'), two welds (4') are formed between the welding fork and the solid shaft and between the solid shaft and the shaft head, and the welding fork is assembled with a spline fork (1') through a universal joint (2'). The inner spline of the spline fork is matched with the outer spline of a mounting interface of the gearbox, then two bolt holes are fastened with bolts, the shaft head is matched with a mounting interface of the belt pulley, and then the mounting interface is fastened with a nut.

[0003] The transmission shaft is applied to the working condition of agricultural machinery, and in the use process, since the transmission shaft is subjected to the pre-tightening bending moment of the belt pulley, the weld of the transmission shaft bears additional bending moment force, which is different from the normal torque transmission of the ordinary transmission shaft, the transmission shaft under this working condition is very prone to breakage failure at the weld position, the failure rate is high, the loss of after-sales three-package is large, and improvement is needed. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of the prior art, and provides a breakage prevention structure transmission shaft, which cancels the process of welding weld connection and avoids the breakage of the weld under the working condition of bearing additional bending moment force. The spline shaft is connected with the spline fork, the bolts are fastened and fixed, the weld is canceled, the breakage failure of the weld is avoided, and the after-sales three-package breakage failure does not occur any more.

[0005] The utility model aims at overcoming the defects of the prior art, and provides a breakage prevention structure transmission shaft, which cancels the process of welding weld connection and avoids the breakage of the weld under the working condition of bearing additional bending moment force. The spline shaft is connected with the spline fork, the bolts are fastened and fixed, the weld is canceled, the breakage failure of the weld is avoided, and the after-sales three-package breakage failure does not occur any more.

[0006] As a further technical scheme, a bolt hole A is formed in the two sides of the first spline fork.

[0007] As a further technical scheme, a bolt hole B is formed in the two sides of the second spline fork.

[0008] As a further technical scheme, the spline shaft adopts a solid spline shaft.

[0009] The utility model discloses the beneficial effects that:

[0010] 1, the welding fork and solid axle between, solid axle and axle head no longer through the welding fixed, but adopt spline connection transmission, avoid the problem that weld fracture appears under the additional bending moment force working condition of weld, avoid the weld fracture failure that appears;

[0011] 2, two spline forks all set up bolt hole, convenient to tighten, guarantee the stability and reliability of spline cooperation. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of prior art.

[0013] Figure 2 It is the structural schematic diagram of the utility model.

[0014] Figure 3 It is the structural schematic diagram when the utility model and gearbox, pulley assembly.

[0015] Reference signs explain: spline fork 1', universal joint 2', welding fork 3', weld 4', solid axle 5', axle head 6';

[0016] First spline fork 1, inner spline A11, bolt hole A12, cross shaft 2, second spline fork 3, inner spline B31, bolt hole B32, spline shaft 4, outer spline B41, outer thread 42, gearbox mounting interface 5, outer spline A51, pulley mounting interface 6. DETAILED DESCRIPTION

[0017] The utility model will be introduced in detail in combination with the drawings below:

[0018] Embodiment: as shown in the accompanying drawings, Figure 2 、 3 The anti-fracture structure transmission shaft includes first spline fork 1, inner spline A11, bolt hole A12, cross shaft 2, second spline fork 3, inner spline B31, bolt hole B32, spline shaft 4, outer spline B41, outer thread 42, gearbox mounting interface 5, outer spline A51 and pulley mounting interface 6.

[0019] Reference the accompanying drawings, Figure 2, the fork of the first spline yoke 1 and the fork of the second spline yoke 3 are connected and driven by the cross shaft 2, at the same time, the outer spline B41 is arranged at one end of the spline shaft 4, the outer spline B41 is used to be inserted into the inner spline B31 of the second spline yoke 3, and spline driving is carried out. In addition, the outer thread 42 is arranged at the other end of the spline shaft 4, the outer thread 42 is used to connect the pulley mounting interface 6, so as to be connected and driven with the pulley. Further, the inner spline A11 is arranged on the side of the first spline yoke 1 away from the spline shaft 4, the inner spline A11 is used to match the outer spline A51 on the gearbox mounting interface 5, and spline driving is realized, as shown in Figure 3

[0020] Further, a bolt hole A12 is arranged on both sides of the first spline yoke 1, and a bolt hole B32 is arranged on both sides of the second spline yoke 3, the bolt hole A12 and the bolt hole B32 are tightened by bolts, so as to ensure the stability and reliability of spline matching. Preferably, the spline shaft 4 is a solid spline shaft.

[0021] The working process of the utility model is as follows: during assembly, first, the outer spline B41 of one end of the spline shaft 4 is inserted into the inner spline B31 of the second spline yoke 3, the fork of the second spline yoke 3 is assembled with the fork of the first spline yoke 1 through the cross shaft 2. Then, the inner spline A11 of the first spline yoke 1 is matched with the outer spline A51 of the gearbox mounting interface 5, and then the two bolt holes A12 are tightened by bolts. The outer thread 42 at the other end of the spline shaft 4 is matched with the pulley mounting interface 6, and then tightened by a nut.

[0022] It can be understood that, for those skilled in the art, equivalent replacement or change of the technical scheme and the utility model concept of the utility model should belong to the protection range of the claims attached to the utility model.​

Claims

1. A break-resistant structural drive shaft, characterized by: It comprises a first spline fork (1), a second spline fork (3) and a spline shaft (4), the fork of the first spline fork (1) is connected with the fork of the second spline fork (3) through a cross shaft (2) for transmission, one end of the spline shaft (4) is provided with external spline B (41) for inserting into the internal spline B (31) of the second spline fork (3), the other end of the spline shaft (4) is provided with external thread (42) for connecting with the pulley mounting interface (6); the internal spline A (11) of the first spline fork (1) is used for matching with the external spline A (51) on the gearbox mounting interface (5) to realize spline transmission.

2. The break-resistant construction drive shaft of claim 1, wherein: A bolt hole A (12) is arranged on each side of the first spline fork (1).

3. The break-resistant design propeller shaft of claim 1, wherein: A bolt hole B (32) is arranged on each side of the second spline fork (3).

4. The break-resistant construction drive shaft of claim 1, wherein: The spline shaft (4) is a solid spline shaft.

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