CN218480041U - Tube for hollow transmission shaft and hollow transmission shaft made of same - Google Patents

Abstract

The utility model discloses a hollow transmission shaft pipe, which comprises a round pipe as the main body part of a transmission shaft, wherein the inner side wall of the round pipe is provided with a plurality of bulges; the bulge is integrated with the circular tube; the bulges are hemispherical and are uniformly distributed on the inner side wall of the circular tube; or the bulges are cuboid, the bulges are uniformly distributed on the inner side wall of the circular tube, the length direction of some bulges is consistent with the rotation axis of the circular tube, and the length direction of some bulges is consistent with the radial direction of the circular tube. The utility model discloses a hollow transmission shaft replaces solid axle, satisfies car lightweight trend, through set up the arch on the inside wall at transmission shaft main part for hollow transmission shaft can bear not equidirectional stress for the car, can bear torsional load better, can avoid damage problems such as fatigue under periodic load effect.

Description

Pipe for hollow transmission shaft and hollow transmission shaft made of same

Technical Field

The utility model relates to a hollow transmission shaft is with pipe and with hollow transmission shaft that it made.

Background

The vehicle drive shaft is subjected to periodic torsional loads during operation; the transmission shaft may have damage problems such as fatigue and the like under the action of periodic load, and may cause adverse consequences such as fracture and the like in severe cases. Patent publication No. CN 106051327A: a steel pipe for a propeller shaft comprising: the steel pipe comprises a steel pipe body, a first anti-torsion layer, a first toughening layer, a second anti-torsion layer and a second toughening layer, wherein the first anti-torsion layer and the first toughening layer are sequentially arranged on the outer surface of the steel pipe body from inside to outside, and the second anti-torsion layer and the second toughening layer are sequentially arranged on the inner surface of the steel pipe body from outside to inside. The steel pipe for the transmission shaft has the advantages that the mode that the annular layers are additionally arranged inside and outside the steel pipe and are attached to the inner side wall and the outer side wall of the steel pipe is adopted, and the strength of the steel pipe for the transmission shaft is enhanced only in a limited mode. In order to meet the development requirements of light weight, energy conservation and environmental protection of automobiles, the trend of hollowing the transmission shaft is more and more obvious, and how to ensure the strength of the hollow transmission shaft while meeting the requirement of light weight is a problem which is not concerned when the field is rapidly developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a hollow transmission shaft is with pipe, through set up the arch on the inside wall at transmission shaft main part for hollow transmission shaft can bear not equidirectional stress for the car, can bear torsional load better, can avoid damage problems such as fatigue under the effect of periodic load. The hollow transmission shaft is adopted to replace a solid shaft, so that the labor performance is consistent, the inertia is small, the weight is reduced by 50%, and the development trend of light weight, energy conservation and environmental protection of an automobile is met.

In order to achieve the purpose, the technical scheme of the utility model is to design a tube for a hollow transmission shaft, which comprises a round tube as the main body part of the transmission shaft, wherein the inner side wall of the round tube is provided with a plurality of bulges; the bulge is integrated with the circular tube;

the bulges are hemispherical and are uniformly distributed on the inner side wall of the circular tube;

or the bulges are cuboid, the bulges are uniformly distributed on the inner side wall of the circular tube, the length direction of some bulges is consistent with the rotation axis of the circular tube, and the length direction of some bulges is consistent with the radial direction of the circular tube. The bulges are arranged on the inner side wall of the main body part of the transmission shaft of the hollow transmission shaft, so that the hollow transmission shaft can bear bending, compression and shearing stress, the strength of the steel pipe for the transmission shaft is enhanced, the light weight is still kept, and the stress of the transmission shaft in different directions can be shared by the arrangement of the strip-shaped bulges in different directions.

The further technical proposal is that the tube material of the round tube is 35CrMo or 34MnB; the circular tube comprises an inner liner, a stainless steel wire mesh layer, a steel tube and an outer wear-resistant layer which are sequentially arranged from inside to outside; the protrusion and the lining layer are integrated. The steel pipe for the hollow transmission shaft adopts 35CrMo and 34MnB with higher strength grade, and compared with the prior art that 25CrMo4 (equivalent to German EA4T steel) is adopted, the strength of the hollow transmission shaft is improved.

The further technical proposal is that some bulges and the rotation axis of the circular tube are arranged at an inclination angle, and the inclination angle is larger than 0 degree and smaller than 90 degrees.

The further technical proposal is that the bulges are in transitional connection with the inner side wall of the round tube through a smooth curved surface. In order to avoid the connection part of the bulge and the inner side wall of the circular tube to become a stress concentration part, smooth curved surface transition connection is adopted.

The further technical proposal is that the bending direction of the smooth curved surface is convex bending from the inner side wall of the circular tube to the rotation axis direction of the circular tube.

The utility model discloses the technical scheme who still provides does, adopts the hollow transmission shaft that hollow transmission shaft was made with the pipe, including transmission shaft main part and rotation connection at the antifriction bearing at transmission shaft main part both ends, the transmission shaft main part is gone up the fixed connecting piece that is used for receiving input torque that is equipped with.

The further technical proposal is that the connecting piece comprises a gear or a chain wheel which is fixedly arranged on the main body part of the transmission shaft.

The connecting piece is a gear, and the length of the tooth root of the gear is more than one time of the tooth width of the gear teeth of the gear; the tooth root is in the shape of a circular truncated cone and the large-size end is arranged close to the gear teeth. According to a large number of research findings (see the analysis of static and dynamic characteristics and influence factors of hollow transmission shafts in the paper "analysis of static and dynamic characteristics and influence factors of hollow transmission shafts" published in Guojun material in the mechanical research and application, journal 2019, 3), the maximum stress of the transmission shaft occurs in the action area of the input torque; the use of a wider root results in better stress distribution, resulting in an increased stress distribution area and reduced stress concentrations.

The utility model has the advantages and the beneficial effects that: the bulges are arranged on the inner side wall of the main body part of the transmission shaft, so that the hollow transmission shaft for the automobile can bear the stress in different directions, can better bear the torsional load, and can avoid the damage problems of fatigue and the like under the action of periodic load.

The bulges are arranged on the inner side wall of the main body part of the transmission shaft of the hollow transmission shaft, so that the hollow transmission shaft can bear bending, compression and shearing stress, the strength of the steel pipe for the transmission shaft is enhanced, the light weight is still kept, and the stress of the transmission shaft in different directions can be shared by the arrangement of the strip-shaped bulges in different directions.

The steel pipe for the hollow transmission shaft adopts 35CrMo and 34MnB with higher strength grade, and compared with the prior art that 25CrMo4 (equivalent to German EA4T steel) is adopted, the strength of the hollow transmission shaft is improved.

The smooth curved surface transition connection is adopted, so that the connection part of the bulge and the inner side wall of the circular tube can be prevented from becoming a stress concentration part.

The maximum stress of the transmission shaft occurs in an input torque acting area; the use of a wider root results in better stress distribution, resulting in an increased stress distribution area and reduced stress concentration.

Drawings

Fig. 1 is a schematic view of a hollow transmission shaft according to the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

figure 3 is a cross-sectional view of the barrel of figure 1.

In the figure: 1. a circular tube; 2. a protrusion; 3. an inner liner layer; 4. a stainless steel wire mesh layer; 5. a steel pipe; 6. an outer wear layer; 7. a rolling bearing; 8. a connecting member.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 3 (for convenience of illustration, a connecting piece is not shown in fig. 1; only part of the bulges are shown in fig. 2), the utility model relates to a hollow transmission shaft pipe, which comprises a circular pipe 1 as the main body part of a transmission shaft, wherein a plurality of bulges 2 are arranged on the inner side wall of the circular pipe 1; the bulge 2 is integrated with the circular tube 1; the bulges 2 are cuboid, the bulges 2 are uniformly distributed on the inner side wall of the circular tube 1, the length direction of some bulges 2 is consistent with the rotation axis of the circular tube 1, and the length direction of some bulges is consistent with the radial direction of the circular tube 1. The pipe material of the round pipe 1 is 35CrMo or 34MnB; the round pipe 1 comprises an inner liner layer 3, a stainless steel wire mesh layer 4, a steel pipe 5 and an outer wear-resistant layer 6 which are sequentially arranged from inside to outside; the protrusion 2 is integrated with the inner liner 3. Some bulges 2 and the rotation axis of the circular tube 1 are arranged at an inclination angle, and the inclination angle is larger than 0 degree and smaller than 90 degrees. The bulge 2 is in transition connection with the inner side wall of the circular tube 1 through a smooth curved surface. The smooth curved surface is curved in a direction that the inner side wall of the circular tube 1 is convex 2 in the direction of the rotation axis of the circular tube 1.

The hollow transmission shaft manufactured by adopting the hollow transmission shaft tube comprises a transmission shaft main body part and rolling bearings 7 which are rotatably connected to two ends of the transmission shaft main body part, wherein a connecting piece 8 for receiving input torque is fixedly arranged on the transmission shaft main body part. The connecting piece 8 comprises a gear fixedly arranged on the main body part of the transmission shaft, and the tooth root length of the gear is more than one time of the tooth width of the gear teeth of the gear; the tooth root is in the shape of a circular truncated cone and the large-size end is arranged close to the gear teeth.

The steel pipe for the hollow transmission shaft is delivered in a protective atmosphere (bright) complete annealing state, and the metallographic structure of the steel pipe in the delivery state is ferrite plus pearlite; the steel pipe is manufactured by adopting a seamless method of hot rolling bar, hot perforation and cold drawing.

The applicant produces the transmission shaft hollow tube: 5000 tons/year; the cost is 1.2 ten thousand yuan/ton, and compared with the cost of 1.8 ten thousand yuan/ton, the cost is saved by 30%/ton; saving: 3000 ten thousand yuan per year. The method responds to new requirements and new missions of the times, realizes the localization of automobile materials, parts and the like to break through international blockade, masters the core technology, realizes self-supporting and contributes to one part of strength. Has good social effect and economic effect and meets the double-carbon target.

The working principle is as follows:

the bulges are arranged on the inner side wall of the main body part of the transmission shaft, so that the hollow transmission shaft for the automobile can bear the stress in different directions, can better bear the torsional load, and can avoid the damage problems of fatigue and the like under the action of periodic load. The bulges are arranged on the inner side wall of the main body part of the transmission shaft of the hollow transmission shaft, so that the hollow transmission shaft can bear bending, compression and shearing stress, the strength of the steel pipe for the transmission shaft is enhanced, the light weight is still kept, and the stress of the transmission shaft in different directions can be shared by the arrangement of the strip-shaped bulges in different directions. The wear-resisting property of the transmission shaft is enhanced by the outer wear-resisting layer, and the torsion load can be better borne by the matching bulges arranged in multiple layers. The tooth root which is arranged at the maximum stress position of the transmission shaft, namely the tooth root position, is very wide, so that the load bearing capacity of the transmission shaft is further enhanced.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The hollow tube for the transmission shaft is characterized by comprising a round tube serving as a main body part of the transmission shaft, wherein a plurality of bulges are arranged on the inner side wall of the round tube; the bulge is integrated with the circular tube;

the bulges are hemispherical and are uniformly distributed on the inner side wall of the circular tube;

or the bulges are cuboid, the bulges are uniformly distributed on the inner side wall of the circular tube, the length direction of some bulges is consistent with the rotation axis of the circular tube, and the length direction of some bulges is consistent with the radial direction of the circular tube.

2. The tube for a hollow drive shaft according to claim 1, wherein the tube material of the circular tube is 35CrMo or 34MnB; the circular tube comprises an inner liner, a stainless steel wire mesh layer, a steel tube and an outer wear-resistant layer which are sequentially arranged from inside to outside; the protrusion and the inner liner layer are integrated.

3. The hollow drive shaft tube of claim 2 wherein the protrusions are disposed at an angle to the axis of rotation of the circular tube, the angle being greater than 0 ° and less than 90 °.

4. The tube as claimed in claim 3, wherein the protrusions are transitionally connected to the inner wall of the circular tube by a smooth curved surface.

5. The tube for a hollow drive shaft according to claim 4, wherein the smoothly curved surface is curved convexly from an inner wall of the circular tube toward a rotation axis of the circular tube.

6. A hollow drive shaft formed of a tube for a hollow drive shaft according to any one of claims 1 to 5, comprising a main body portion of the drive shaft to which a connecting member for receiving an input torque is fixedly attached, and rolling bearings rotatably attached to both ends of the main body portion of the drive shaft.

7. The hollow drive shaft of claim 6 wherein the connector comprises a gear or sprocket fixedly disposed on the drive shaft body portion.

8. The hollow drive shaft of claim 7 wherein the coupling is a gear having a root length greater than one time the width of the gear teeth; the tooth root is in a circular truncated cone shape, and the large-size end of the tooth root is close to the gear teeth.

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