CN215621194U - Spline mounting structure of drive shaft and hub bearing - Google Patents
Spline mounting structure of drive shaft and hub bearing Download PDFInfo
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- CN215621194U CN215621194U CN202121993317.1U CN202121993317U CN215621194U CN 215621194 U CN215621194 U CN 215621194U CN 202121993317 U CN202121993317 U CN 202121993317U CN 215621194 U CN215621194 U CN 215621194U
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Abstract
A spline mounting structure of a driving shaft and a hub bearing comprises the driving shaft and the hub bearing; the driving shaft comprises a shaft body and a connecting shaft which are of an integrated structure; a first external spline, a second external spline and an external thread are sequentially arranged on the connecting shaft along the direction of the connecting shaft away from the shaft body; a mounting hole is formed in the hub bearing; an internal spline is arranged in the mounting hole; the tooth shapes of the first external spline and the second external spline are arranged in a staggered manner; the tooth form dislocation quantity is equal to the theoretical maximum tooth groove width of the inner spline minus the theoretical minimum tooth thickness of the second outer spline; the first external spline and the second external spline are engaged with the internal spline after interference fit; the external thread extends out of the internal spline and then is in threaded connection with a fixed nut. The utility model discloses a spline mounting structure has avoided drive shaft and wheel hub bearing contact terminal surface to take place the friction and has produced the abnormal sound in the use, has promoted the driving experience. The spline mounting structure is simple in design, convenient to operate, novel in originality and remarkable in effect.
Description
Technical Field
The utility model relates to the technical field of driving shaft transmission, in particular to a spline mounting structure of a driving shaft and a hub bearing.
Background
There has been a phenomenon in which an automobile drive shaft is used for a certain period of time: the side wall of the chassis wheel has sharp abnormal sound. The abnormal sound not only influences the mood of the client in driving, but also enables the client to generate the trouble of the vehicle and have the worry of potential safety hazard in continuous driving; the driving experience of the customer is seriously influenced; therefore, the customer requires that no abnormal sound is allowed to be generated during the use of the vehicle.
Through the analysis, the abnormal sound is mostly because the external spline of drive shaft stiff end has the flank clearance with the internal spline cooperation of wheel hub bearing, can produce relative motion because of there being the flank clearance in the use to lead to two part contact end faces to take place the friction and produce the abnormal sound.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a spline mounting structure of a driving shaft and a hub bearing, and the spline mounting structure is used for solving the technical problem.
In order to achieve the purpose, the spline mounting structure of the driving shaft and the hub bearing comprises the driving shaft and the hub bearing; the driving shaft comprises a shaft body and a connecting shaft which are of an integrated structure; a first external spline, a second external spline and an external thread are sequentially arranged on the connecting shaft along the direction of the connecting shaft away from the shaft body; a mounting hole is formed in the hub bearing; an internal spline is arranged in the mounting hole; the tooth shapes of the first external spline and the second external spline are arranged in a staggered manner; the tooth form dislocation quantity is equal to the theoretical maximum tooth groove width of the inner spline minus the theoretical minimum tooth thickness of the second outer spline; the first external spline and the second external spline are engaged with the internal spline after interference fit; the external thread extends out of the internal spline and then is in threaded connection with a fixed nut; the hub bearing is fixed on the shaft body by a fixing nut.
For ease of understanding, the above description is supplemented by the following:
the offset corresponds to an increase in the tooth thickness of the second male spline, that is, the first male spline and the second male spline as a whole can be regarded as a "male spline with a larger tooth thickness". The theoretical maximum tooth space width of the internal spline is the maximum actual tooth space width of the internal spline plus the total tolerance of the tooth space width of the internal spline. The theoretical minimum tooth thickness of the second external spline is the minimum actual tooth thickness of the second external spline minus the total tolerance of the tooth thickness of the second external spline. And subtracting the theoretical minimum tooth thickness of the second external spline from the theoretical maximum tooth groove width of the internal spline to obtain the theoretical maximum spline meshing clearance between the internal spline and the second external spline. When the dislocation amount is equal to the theoretical maximum spline meshing clearance, the fit clearance between the outer spline with larger tooth thickness and the inner spline is zero only when the tooth width machining error of the inner spline is the maximum on the pole and the tooth thickness machining error of the second outer spline is the maximum under the pole; in addition to this, in other cases, the fit between the "external spline with larger tooth thickness" and the internal spline is interference fit.
The maximum actual tooth width of the internal spline, the total tolerance of the tooth width of the internal spline, the minimum actual tooth thickness of the second external spline and the total tolerance of the tooth thickness of the second external spline are obtained by standard calculation according to a spline standard GBT 3478-1995; GBT3478-1995 is a national standard; the calculation method of the maximum actual tooth width, the total tolerance of the tooth width of the internal spline, the minimum actual tooth thickness of the second external spline, and the total tolerance of the tooth thickness of the second external spline is not within the inventive scope of the present invention.
Further, a space is provided between the first external spline and the second external spline.
Further, the second external spline and the internal spline are in clearance fit when being meshed independently, and the matching grade is 6 grades.
Furthermore, the central lines of the shaft body and the connecting shaft are positioned on the same straight line, the connecting shaft is fixedly connected to the end face of one side of the shaft body, and the radius of the end face is larger than that of the connecting shaft.
The technical problem that this application will solve is because external splines and internal spline lead to for clearance fit, and the interference fit can be solved with external splines and internal spline design to in theory. In practice, the solution is difficult to implement and expensive due to the influence of the machining precision.
Preferably, the tooth shape and the tooth number of the first external spline and the second external spline and the tolerance grade of the tooth thickness and the tooth thickness are the same. When machining, the first external spline and the second external spline are machined by two different cutters simultaneously, the two pairs of spline tooth rubbing plates with the adjusted tooth form dislocation quantity are assembled on the tool rest and fixed on the machine tool, so that the tooth form dislocation precision can be guaranteed, the tooth form dislocation quantity can be kept consistent during batch production, and the influence on the matching use of the first external spline and the second external spline caused by the fact that the machining deviation of the first external spline and the second external spline is too approximate can be avoided. For example: the displacement of the first and second external splines may be periodically increased or decreased.
In the installation process, the second external spline enters the internal spline first, and at the moment, clearance fit is realized; and then the first external spline is brought in by screwing the fixing nut, and after the installation is finished, the two end faces of the driving shaft body and the hub bearing, which are close to each other, are attached together and fixed by the fixing nut.
Advantageous effects
The utility model provides a spline mounting structure of a driving shaft and a hub bearing, which is characterized in that two staggered external splines are arranged on a connecting shaft of the driving shaft and are meshed with an internal spline of the hub bearing; the bad influence that clearance fit produced between single external splines and the internal spline among the prior art has been eliminated through control dislocation volume, has avoided drive shaft and wheel hub bearing contact end face to take place the friction and has produced the abnormal sound in the use, has promoted and has driven experience. The utility model has the advantages of simple design, convenient operation, novel originality, and remarkable effect of the spline mounting structure.
Drawings
Fig. 1 is a schematic view of the construction of a drive shaft.
Fig. 2 is a schematic structural view of the hub bearing.
Fig. 3 is a front view of the hub bearing.
Fig. 4 is a sectional view taken along the plane a-a of fig. 3.
Fig. 5 is an assembly view of the drive shaft and the hub bearing after the installation is completed.
Fig. 6 is a cross-sectional view of fig. 5.
FIG. 7 is a cross-sectional view of the assembled structure of the drive shaft and hub bearing with the first external spline just entering the internal spline during installation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
In view of the problems in the prior art, embodiments of the present invention provide a spline mounting structure for a drive shaft and a hub bearing.
Examples
As shown in fig. 1 to 7, a spline mounting structure of a driving shaft and a hub bearing comprises a driving shaft and a hub bearing; the driving shaft comprises a shaft body 1 and a connecting shaft 2 which are integrally structured; along the direction that the connecting shaft 2 is far away from the shaft body 1, a first external spline 21, a second external spline 22 and an external thread 23 are sequentially arranged on the connecting shaft 2; the lengths of the first external spline 21, the second external spline 22 and the external thread 23 are respectively 10 +/-0.5 mm, 30 +/-0.5 mm and 30 +/-0.5 mm; a gap is arranged between the first external spline and the second external spline, and the length of the gap is 5 +/-0.5 mm; the minimum actual tooth thickness of the first external spline 21 and the second external spline is 1.486 mm; the total tolerance of the tooth thickness of the first external spline and the total tolerance of the tooth thickness of the second external spline are both +/-0.085 mm. The first external spline 21 and the second external spline 22 are machined according to the standard of GBT3478-1995, and the centering mode adopts tooth flank centering; the modulus is 1; the number of teeth is 25, and the pressure angle is 45 degrees; the tooth root pattern is round; the tolerance grade is 6; the diameter of the measuring rod is 2 mm; the deflection coefficient is 0; reference circle diameter 25; base circle diameter 17.678.
A mounting hole 3 is arranged in the hub bearing; an internal spline 4 is arranged in the mounting hole 3; the length of the internal spline is 50 +/-1 mm, the maximum value of the actual tooth space width of the internal spline is 1.657mm, and the total tolerance of the tooth space width is +/-0.086 mm. The tooth forms of the first external spline 21 and the second external spline 22 are arranged in a staggered manner; the tooth form displacement amount is equal to the theoretical maximum tooth groove width of the internal spline 4 minus the theoretical minimum tooth groove width of the second external spline 22; the theoretical maximum tooth space width of the internal spline 4 is equal to 1.657+ 0.086-1.743 mm; the theoretical minimum tooth space width of the second external spline 22 is equal to 1.486+ 0.085-1.571 mm; the dislocation amount is 1.743-1.571 ═ 0.172 mm; the internal spline is processed according to the standard of GBT3478-1995, and the centering mode adopts the tooth flank centering; the modulus is 1; the number of teeth is 25, and the pressure angle is 45 degrees; the tooth root pattern is round; the machining tolerance grade is 6; the diameter of the measuring rod is 2 mm; the deflection coefficient is 0; reference circle diameter 25; base circle diameter 17.678.
The first external spline 21 and the second external spline 22 are engaged with the internal spline 4 after interference fit; the external thread 23 extends out of the internal spline and then is in threaded connection with the fixed nut 5; the hub bearing is fixed on the shaft body 1 by a fixing nut 5.
For ease of understanding, the above description is supplemented by the following:
the offset corresponds to an increase in the tooth thickness of the second male spline 22, that is, the first male spline 21 and the second male spline 22 as a whole can be regarded as one "male spline having a larger tooth thickness". The theoretical maximum tooth space width of the internal spline 4 is the maximum actual tooth space width of the internal spline 4 plus the total tolerance of the tooth space width. The theoretical minimum tooth thickness of the second male spline 22 is the minimum actual tooth thickness of the second male spline 22 minus the total tolerance for tooth thickness of the second male spline 22. The theoretical maximum tooth space width of the internal spline 4 minus the theoretical minimum tooth thickness of the second external spline 22 is the theoretical maximum spline engagement gap between the internal spline 4 and the second external spline 22. When the dislocation amount is equal to the theoretical maximum spline meshing clearance, only when the tooth width machining error of the inner spline 4 is the utmost maximum, and the tooth thickness machining error of the first outer spline 21 is the utmost maximum, the fit clearance between the outer spline with larger tooth thickness and the inner spline 4 is zero; in addition to this, in other cases, the "external spline with larger tooth thickness" is fitted with the internal spline 4 in an interference fit manner.
The second external spline 22 is in clearance fit when being separately meshed with the internal spline 4, and the matching grade is 6 grades.
The central lines of the shaft body 1 and the connecting shaft 2 are positioned on the same straight line, the connecting shaft 2 is fixedly connected to one side end face of the shaft body 1, and the radius of the end face is larger than that of the connecting shaft 2.
The tooth shape and the number of teeth of the first external spline 21 and the second external spline 22, and the tolerance levels of the tooth thickness and the tooth thickness are the same. In the actual machining process, the first external spline 21 and the second external spline 22 are machined according to the standard of GBT3478-1995, and machining parameters except the length are kept consistent. However, during machining, the first external spline 21 and the second external spline 22 are machined by two different sets of cutters simultaneously, the two sets of spline tooth rubbing plates with the adjusted tooth profile dislocation amount are assembled on the tool rest and fixed on the machine tool, so that tooth profile dislocation accuracy can be guaranteed during machining, the tooth profile dislocation amount can be kept consistent during batch production, and the possibility that the matching use of the first external spline 21 and the second external spline 22 is influenced due to the fact that the machining deviation of the first external spline 21 and the second external spline 22 is too approximate can be avoided. For example: it may cause the misalignment amount of the first male spline 21 and the second male spline 22 to become periodically larger or smaller.
In the installation process, the second external spline 22 firstly enters the internal spline 4, and is in clearance fit at the moment; then, the first external spline 21 is brought in by tightening the fixing nut 5, and after the installation is completed, the shaft body 1 of the drive shaft and the two end faces of the hub bearing, which are close to each other, are attached together and fixed by the fixing nut 5.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the utility model as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (6)
1. A spline mounting structure of a driving shaft and a hub bearing comprises the driving shaft and the hub bearing; the driving shaft is characterized by comprising a shaft body and a connecting shaft which are of an integrated structure; a first external spline, a second external spline and an external thread are sequentially arranged on the connecting shaft along the direction of the connecting shaft away from the shaft body; a mounting hole is formed in the hub bearing; an internal spline is arranged in the mounting hole; the tooth shapes of the first external spline and the second external spline are arranged in a staggered manner; the tooth form dislocation quantity is equal to the theoretical maximum tooth groove width of the inner spline minus the theoretical minimum tooth thickness of the second outer spline; the first external spline and the second external spline are engaged with the internal spline after interference fit; the external thread extends out of the internal spline and then is in threaded connection with a fixed nut; the hub bearing is fixed on the shaft body by a fixing nut.
2. A spline-mounting structure of a drive shaft and a hub bearing according to claim 1, wherein the theoretical maximum tooth space width of the internal spline is the maximum value of the actual tooth space width of the internal spline plus the total tolerance of the tooth space width of the internal spline; the theoretical minimum tooth thickness of the second external spline is the minimum actual tooth thickness of the second external spline minus the total tolerance of the tooth thickness of the second external spline.
3. A splined mounting arrangement for a drive shaft and hub bearing according to claim 2, wherein a space is provided between the first external spline and the second external spline.
4. A spline-mounting structure for a drive shaft and a hub bearing according to claim 3, wherein the second male spline is a clearance fit when separately engaged with the female spline, and the fit grade is 6.
5. A spline-mounting structure for a drive shaft and a hub bearing according to claim 4, wherein the center lines of the shaft body and the connecting shaft are aligned, the connecting shaft is fixedly connected to one end surface of the shaft body, and the radius of the end surface is larger than that of the connecting shaft.
6. A splined mounting arrangement for a drive shaft and hub bearing according to claim 5, wherein the first and second external splines have the same tooth form and number and tolerance levels for tooth thickness and tooth thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121993317.1U CN215621194U (en) | 2021-08-24 | 2021-08-24 | Spline mounting structure of drive shaft and hub bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121993317.1U CN215621194U (en) | 2021-08-24 | 2021-08-24 | Spline mounting structure of drive shaft and hub bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215621194U true CN215621194U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121993317.1U Active CN215621194U (en) | 2021-08-24 | 2021-08-24 | Spline mounting structure of drive shaft and hub bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215621194U (en) |
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2021
- 2021-08-24 CN CN202121993317.1U patent/CN215621194U/en active Active
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