CN214888455U

CN214888455U - Transfer case spline connection structure

Info

Publication number: CN214888455U
Application number: CN202121664284.6U
Authority: CN
Inventors: 肖金钊; 洪新仁; 韦清民
Original assignee: Hubei Xingling Special Gearbox Co ltd
Current assignee: Hubei Xingling Special Gearbox Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-11-26
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses a transfer case spline connection structure belongs to transfer case technical field, and it includes the drive shaft, the surface of drive shaft is provided with the gear, the surface of drive shaft is provided with the internal spline, the surface and the external spline of internal spline mesh mutually, the external spline sets up in the inner wall of gear, the surface of drive shaft is provided with the direction section. This transfer case spline connection structure, through setting up drive shaft, gear, external splines, internal spline and short tooth, for solving the problem that is difficult to assemble on the design change the direction section on the drive shaft into the short tooth with the same modulus of involute external splines, the external diameter of short tooth is less than interior spline pitch diameter to use the addendum circle of short tooth as the locating surface, change the location round hole that is involute form internal spline into rather than complex size, the finish machining back, during the assembly, the tooth's socket of alignment short tooth that involute form internal spline can be very convenient, consider the difficult point when pressfitting when solving in the past assembly with the short tooth's socket as the direction.

Description

Transfer case spline connection structure

Technical Field

The utility model belongs to the technical field of the transfer case, specifically be transfer case spline connection structure.

Background

The transfer case is a device for distributing power of an engine, and can output power to a rear axle or to both a front axle and a rear axle. From this perspective, it can be seen that the transfer case is actually a fitting on a four-wheel drive vehicle. With the development of the four-wheel drive technology, the transfer case is also changed all the time, and the transfer case with different styles is gradually formed, and the existing transfer case changes the flat key connection of the original gear and the shaft into the involute spline connection for torque transmission on the part process. The spline transmission torque is larger than that of a flat key, but the spline part can generate various deformations such as distortion and the like after processes such as heat treatment and the like, the circumferential runout index of the gear is out of tolerance after the gear and the shaft are assembled, the vibration of the whole box body assembly can be caused, and the noise is increased. If a length of the spline sufficient to transmit torque is left, the remaining portion is made cylindrical. The circular hole matching surface improves the centering and positioning precision of parts, reduces the accumulated error during assembly, improves the working reliability and prolongs the service life, but the method has one defect. Exactly when axle and gear assembly, the outer tooth contact in the cylinder locating surface elder generation, the cylinder locating surface is interference fit again, and the tooth's socket is difficult to aim at with the tooth, if not aim at can't rotate gear shaft and internal tooth, the internal tooth can't be emboliaed to the external tooth on the gear shaft, degree of difficulty and difficulty when having increased the assembly.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to overcome prior art's above-mentioned defect, the utility model provides a transfer case spline connection structure, when having solved the inside axle of present transfer case and gear assembly, the outer tooth contact in the cylinder locating surface elder generation, the cylinder locating surface is interference fit again, and the tooth's socket is not aimed at with the tooth well, if do not aim at to be unable rotation tooth axle and internal tooth, the tooth is epaxial the outer tooth can't embolia the internal tooth. Increasing the difficulty and difficulty of assembly.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the transfer case spline coupling structure comprises a driving shaft, wherein a gear is arranged on the surface of the driving shaft, an internal spline is arranged on the surface of the driving shaft, the surface of the internal spline is meshed with an external spline, the external spline is arranged on the inner wall of the gear, a guide section is arranged on the surface of the driving shaft, the guide section is a cylindrical smooth surface, the surface of the guide section is cylindrical, short teeth arranged in an involute shape are arranged on the surface of the guide section, the number of teeth of the short teeth is the same as that of the external spline, and the external spline and the internal spline are arranged in the involute shape.

As a further aspect of the present invention: and performing heat treatment on the internal spline and the external spline.

As a further aspect of the present invention: the guide section is in interference fit with the inner wall of the gear.

As a further aspect of the present invention: the outer diameter of the short teeth is smaller than that of the internal spline.

As a further aspect of the present invention: the inner wall of the external spline is meshed with the surface of the short tooth.

(III) advantageous effects

Compared with the prior art, the beneficial effects of the utility model reside in that:

this transfer case spline connection structure, through setting up drive shaft, gear, external splines, internal spline and short tooth, for solving the problem that is difficult to assemble on the design change the direction section on the drive shaft into the short tooth with the same modulus of involute external splines, the external diameter of short tooth is less than interior spline pitch diameter to use the addendum circle of short tooth as the locating surface, change the location round hole that is involute form internal spline into rather than complex size, the finish machining back, during the assembly, the tooth's socket of alignment short tooth that involute form internal spline can be very convenient, consider the difficult point when pressfitting when solving in the past assembly with the short tooth's socket as the direction.

Drawings

Fig. 1 is a schematic front view of a cross-sectional structure of the present invention;

FIG. 2 is a schematic view of a front view of the external spline of the present invention;

FIG. 3 is a schematic view of a front view of the cross-sectional structure of the inner spline of the present invention;

FIG. 4 is a schematic view of the cross-sectional structure of the guide section viewed from the right of the present invention;

in the figure: 1 driving shaft, 2 gears, 3 guide sections, 4 external splines, 5 internal splines and 6 short teeth.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

As shown in fig. 1-4, the utility model provides a technical scheme: transfer case spline connection structure, including drive shaft 1, the surface of drive shaft 1 is provided with gear 2, the surface of drive shaft 1 is provided with internal spline 5, the surface and the external spline 4 of internal spline 5 mesh mutually, external spline 4 sets up in gear 2's inner wall, the surface of drive shaft 1 is provided with direction section 3, direction section 3 is cylindrical rounding off surface, the surface of direction section 3 is cylindrical and the surface is provided with the dogtooth 6 that is involute form setting, dogtooth 6 is the same with external spline 4's number of teeth modulus, external spline 4 all is involute form setting with internal spline 5.

Specifically, as shown in fig. 1 and 2, the inner spline 5 and the outer spline 4 are both subjected to a heat treatment process, and by providing the inner spline 5, the inner spline 5 and the outer spline 4 are both subjected to a heat treatment, so that the wear resistance and the mechanical strength are good, and the durability is improved.

Specifically, as shown in fig. 4, the guide section 3 is interference fit with the inner wall of the gear 2, the inner wall of the external spline 4 is meshed with the surface of the short tooth 6, the outer diameter of the short tooth 6 is smaller than the outer diameter of the internal spline 5, and by arranging the guide section 3, the guide section 3 can keep a stable directional conduction effect while keeping a good matching effect through the short tooth 6 arranged on the surface, so that the assembly is more convenient in the use process.

The utility model discloses a theory of operation does: during assembly, the gear 2 is moved opposite to the surface of the driving shaft 1 until the gear reaches the guide section 3, the external spline 4 and the short tooth 6 on the inner wall of the gear 2 are in a meshed state, then the gear 2 is continuously moved rightwards until the external spline 4 is in contact with the internal spline 5, and after the gear is pressed by external force, the internal spline 5 and the external spline 4 are kept in a meshed state.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. Transfer case spline connection structure includes drive shaft (1), its characterized in that: the surface of drive shaft (1) is provided with gear (2), the surface of drive shaft (1) is provided with internal spline (5), the surface and the external spline (4) of internal spline (5) mesh mutually, external spline (4) set up in the inner wall of gear (2), the surface of drive shaft (1) is provided with direction section (3), direction section (3) are cylindrical rounding off surface, the surface of direction section (3) is cylindrical and the surface is provided with short tooth (6) that are involute form setting, short tooth (6) are the same with the number of teeth modulus of external spline (4), external spline (4) all are involute form setting with internal spline (5).

2. The transfer case spline coupling of claim 1, wherein: and the inner spline (5) and the outer spline (4) are subjected to a heat treatment process.

3. The transfer case spline coupling of claim 1, wherein: the guide section (3) is in interference fit with the inner wall of the gear (2).

4. The transfer case spline coupling of claim 1, wherein: the outer diameter of the short teeth (6) is smaller than that of the internal splines (5).

5. The transfer case spline coupling of claim 1, wherein: the inner wall of the external spline (4) is meshed with the surface of the short tooth (6).