JPS58211018A - Axially fixed type spline and method of producing same - Google Patents

Abstract

PURPOSE:To prevent both splines completely from axial slip by transforming plastically a portion of tooth of a female spline, then heat treating it and making a male spline engage fixedly the female one without circumferential clearances. CONSTITUTION:A portion Ta of teeth T of a female spline 5a is transformed plastically to flatten the tooth ends so that the circumferential length of valley V between the teeth T is partially narrowed. Thereafter, heat treatment such as hardening is given to an U-joint flange 5 to harden the spline 5a. A spline shaft 3 formed with a female spline 3a, as shown in the drawing, is press fitted onto said spline 5a. Since in this instance, the interval between the valleys V to teeth T of the female spline 5a plastically transformed is nallowed, a pair of male and female splines 5a, 3a press fit and engage each other without circumferential clearances.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axially fixed spline made up of a pair of male and female splines that are meshed with each other and fixed in the axial direction, and a method for manufacturing the same. This invention relates to an axially fixed spline that is suitable for a spline shaft used in a support arm portion and that can prevent slip noise caused by stick-slip when starting or changing gears of a vehicle, and a method for manufacturing the same.

Conventionally, in large vehicles such as trucks, because of the long wheel pace, a method has generally been adopted in which the propeller shaft is divided into front and rear parts, and the large connecting part fixed to the front propeller shaft is supported by a center bearing. To explain this conventional example based on FIG. 1, the propeller shaft 1
A spline shaft 3 with a female spline 3a is fixed to the rear end of the front propeller shaft 2, and a U-joint with a female spline 5a of the rear propeller shaft 4 is fixed to the spline shaft. 7
The flange 5 is engaged and inserted and fixed in the axial direction.

The tube 6 is fixed to the outer periphery of the spline shaft 3 by welding, and the grease nipple 7 is attached to the flange 5 of the U-joint 7. center bearing l
O is a plurality of balls] 1. It consists of an outer race 12 that accommodates the balls, an inner race 13, a center bearing case 14 attached to the outer race 12, and a collar 15 that surrounds the center bearing case. The chassis side is facing towards the top. The vibration of the propeller shaft 1 is absorbed by the rubber,
It is designed so that it is not transmitted to the frame or body. Frozen rubber] The tightening bolt installed on the 6-piece collar 15]
It is held in place by a pair of seat plates 19 fixed to 7 with nuts 18 so as not to bend in the front-rear direction.

A dust shield 21 and an oil seal 22 made of a thin elastic material are fixed to the dust shield and rounded to the spline shaft 3 and the U-shaped flange 5, respectively, and the oil seal is attached to the end face 14 of the center bearing case 14. a K 'J'% Sexual contact is possible. In addition, the inner race 13 of the center bearing 10 is press-fitted into the spline shaft 3 11 and tightened with a U-shaped flange 5 nut 24.
b is the side i' of the inner race 13 of the center bearing 10
The female spline 5a of the flange 5 is axially fixed to the female spline 3a of the spline shaft 3, which is suppressed by the female spline 3a of the spline shaft 3.

In the conventional example, the tooth portions of the male and female splines 5a, 3a are machined parallel to each other at equal intervals, and a certain fitting gap is formed in the direction in which they are installed. Therefore, when starting or opening a vehicle, changing gears, etc., the propeller shaft lVc! If Il<torque suddenly changes, the fitting gap will cause the end 5b of the U-joint 7 flange 5 and the inner race 13 of the center bearing 10 to
Stick-slip occurs between the splines 13a and the slip sound and the ftrtN of the male and female splines 5a and 3a.
The impact sound of i resonates with the propeller shaft 1 and the duplex 6, and this n- is transmitted as an abnormal noise to the inside of the cab, causing hearing problems.The conventional technology cannot prevent this abnormal noise. #h and X7 were considered impossible.

The present invention has been made to eliminate the drawbacks of the prior art described above.
'The purpose of this is to plastically deform a part of the teeth of the female spline in a spline formed by interlocking a pair of male and female splines and identifying them in the axial direction. After that, heat treatment is applied 1, and the female splines are engaged and fixed without any gaps in the circumferential direction, thereby creating a problem between the end of the U-shaped Indian flange and the center surface of the inner race of the center bearing. The objective is to completely prevent stick-slip, and thereby to prevent abnormal noise caused by the slip noise that occurs when the vehicle starts or changes gears, and the impact noise of the spline teeth. Another object of the present invention is to provide a spline that is extremely easy to manufacture and has a great preventive effect, and a method for manufacturing the spline.

In short, the present invention provides a spline in which a pair of female and male splines are engaged with each other and fixed in the axial direction, in which a portion of the teeth of the female spline is plastically deformed in the circumferential direction of the trough of the first spline. The spline is formed so that its length is partially narrowed, and the female spline is press-fitted and fixed to the female spline. In the method ii of the present invention, in which a pair of female and male splines are mutually engaged and fixed in the axial direction, the teeth and valleys of the female spline are formed by machining, and the shaft portion and the trough are formed by machining. A jig consisting of a bulging head integrally formed with a shaft portion is inserted into the female spline, and a part of the teeth of the spline is plastically deformed by the bulging head to form a circle in the trough. It is characterized in that the length in the circumferential direction is partially narrowed, and then heat treatment such as quenching is performed, and the female spline is press-fitted into the female spline.

The present invention will be explained below based on embodiments shown in the drawings. First, the present invention will be explained based on the first embodiment shown in FIGS. The bulging head 2 of the jig 26 consists of a cylindrical bulging head 26b formed integrally with the shank 26f+, which is fixed.
6b is inserted into the female spline 5a, and pressed against a portion 111a of the spline's teeth 1', for example near the center in the longitudinal direction, and the U-shaped flange 5 is rotated as shown by arrow A. Then, as shown in FIGS. 3 and 4, the part Ta of the tooth T of the female spline 5a pressed by the bulging head 26b is plastically deformed so that the tooth tip is crushed by 7", and the tooth part The length in the circumferential direction of the valley portion V between the holes is formed to be partially narrow.Then, the U-joint flange 5 is subjected to heat treatment such as quenching to harden the spline 5a, and the spline 5a is hardened.
As shown in the figure, a spline shaft 3 having a female spline 3a formed therein is press-fitted. In this case, since the interval between the valleys (2) of the teeth 'r' of the plastically deformed female spline 5a is narrow, the pair of male and female splines 5a, 3a mesh with each other without any gap in the circumferential direction and move in and out. Then, when the U-shaped ind flange 5 is tightened with the sat 24, its end 5b
Side surface 13 of inner race 13 of center bearing 10
The male and female splines 5a, 3a are fixed in one direction by pressing tl.

Next, the present invention will be explained based on a second embodiment shown in FIGS. The bulging head 30b of the jig 30, which is composed of the bulging head 30b having the same teeth t as the female spline 3a and the shaft 30a, is engaged with the female spline 5a, and the bulging head By slightly twisting the integrally formed shaft portion 30a as shown by arrow B, part Ta of the tooth portion T of the female spline '5a is plastically deformed in the circumferential direction. Then, the female spline 3a of the spline shaft 3 is engaged and press-fitted, and as shown in FIG.
5b is pressed against the side surface 3.38 of the inner race 13 of the center bearing 10 and fixed in the axial direction.

Since the length in the circumferential direction of the valley part 2 between the part Ta of the tooth part 1' which is plastically deformed in the circumferential direction is narrow, the female spline 3a meshes with the female spline 5a without any gap.

The present invention has the power to play chess as described above, and its operation will be explained below. Also in the embodiments of the splines 5a, 3a of the present invention, there is a gap in the circumferential direction between the male and female splines 5a, 3a.
Therefore, even if a large torque fluctuation occurs between the spline shaft 3 and the U-shaped flange 5 when starting the vehicle or changing gears, the relationship between the end 5b of the U-shaped flange 5 and the inner race 13 of the center bearing 10 will be maintained. Stick-slip will not occur between the splines 5a and the side surface 13a, and slip noise and impact noise between the splines 5a and 3a will also no longer occur. It has been found that both Examples can be fully put into practical use.

The present invention operates as described above, and therefore, by wiping a spline formed by a pair of male and female splines that are VL-engaged with each other and fixed in the axial direction, one of the teeth of the female spline is fixed. The female spline was fully plastically deformed and then heat treated, and the female spline was engaged and fixed without any gaps in the circumferential direction, so that no damage occurred between the end of the U-joint 7 lange and the side surface of the inner race of the center bearing. As a result, it is possible to completely prevent stick-slip from occurring.As a result, it is possible to prevent abnormal noises caused by slip noises and impact noises from spline teeth when the vehicle starts and changes gears. . Further, the present invention has the advantage that it is possible to provide a spline that is extremely easy to manufacture and has a great soundproofing effect, and a method for manufacturing the spline.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing the mutual relationship between the propeller shaft and the center bearing, Figs. A vertical cross-sectional view showing a state in which a part of the southern part of the female spline of the flange is plastically deformed, FIG. 3 is a partially broken perspective view of the completed female spline, and FIG. 4 is IV-1 in No. 3M.
5 to 7 are partial vertical cross-sectional views in the direction of the v arrow, and FIGS.
Figure 5 is a vertical I loft view similar to Figure 2, Figure 6 is a partially cutaway perspective view similar to Figure 133, and Figure 7 is the same as Figure 6.
It is a partial longitudinal sectional view taken along arrows ■-W of one word. 3 is a spline shaft, 3a is a female spline, 5 is a U-ji, an Indian flange, 5a is a female spline, 26 is a jig, 26a is a shaft portion, 26b is a bulging head, 30 is a jig,
30a is the shaft, 30b is the bulging head, Tt; i: tooth of the female spline, Illa is a part of the tooth, t is the ridge formed on the bulging head, and V is the valley of the female spline. Department. Patent departure for Hino Motors Co., Ltd. Patent attorney 1) Kazuo Figure 1 Figure 2, 5

Claims (1)

[Scope of Claims] 1. In a spline formed by a pair of male and female splines that are meshed with each other and fixed in the axial direction, a part of the tooth portion of the female spline is plastically deformed f′L, and a circle of the threaded spline portion is An axially fixed spline, characterized in that the female spline is press-fitted and fixed to the female spline, the spline being formed so that its circumferential length is partially narrowed. 2. In a spline formed by a pair of male and female splines that are engaged with each other and fixed in the axial direction, the teeth and valleys of the female spline described in III are formed by machining. A jig consisting of the formed bulging head is inserted into the female spline, and a part of the teeth of the spline is plastically shaped into a bulge by the bulging head to partially reduce the circumferential length of the trough. 1. A method of manufacturing an axially fixed spline, which comprises forming a narrow spline, then subjecting it to heat treatment such as quenching, and press-fitting a female spline into the female spline. 3. The bulging head of the jig is formed into a cylindrical shape.1. The axially fixed spline according to claim 2, characterized in that a cylindrical bulging head presses the teeth of the female spline in the radial direction to plastically deform the teeth. Production method. 4. The bulging head of the jig has the same teeth as the female spline, and the bulging head is engaged with the female spline, and the jig and the female spline are slightly twisted relative to each other,
3. The method of manufacturing an axially fixed spline according to claim 2, wherein a part of the tooth portion is plastically deformed in the circumferential direction.