JPH0262410A - Press in fitting method for spline - Google Patents

Abstract

PURPOSE:To prevent the looseness of a nut and the generation of noise by loose-fitting the entire area in a circumferential direction at the entrance part of a spline and tight-fitting only one part in the circumferential direction at the deep inner part of the spline. CONSTITUTION:The right end parts 13a of spline teeth 13 are formed with a loose-fitting dimension in relation to spline grooves 11 spreading over the entire circumference. One part in the circumferential direction at the base parts 13b of the spline teeth 13 is formed with a tight-fitting dimension and their remaining parts with the loose-fitting dimension in relation to the spline grooves 11. The tooth edge diametric circle SD3 of the base part 13b is formed larger than the tooth edge diametric circle SD2 of the right end parts 13a and smaller than the groove bottom diametric circle BD2. A gear 10 is fitted to a shaft 12 from its right end side so as to be tightened by a nut 14.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a spline press-fitting method in which a boss having a spline groove formed on the inner periphery and a shaft having spline teeth formed on the outer periphery are press-fitted to each other. It is about the method.

(Conventional technology) Conventionally, the arrangement was as shown in FIGS. 5 and 6.

That is, a spline groove 2 is formed on the inner circumference of the boss 1a of the gear 1, and spline teeth 4 are formed on the outer circumference of the shaft 3.

In this case, as shown in FIG. 6, the spline tooth 4 is formed so that the tooth thickness T1 of its pitch circle is slightly smaller than the groove width W1 of the pitch circle of the spline groove 2, and the tooth tip of the spline tooth 4 is The diameter mill SDI is formed to have a slightly larger diameter than the groove bottom diameter inner BDI of the spline groove 2.

Then, the boss 1a is attached to the shaft 3 from the right side (tip side).
are press-fitted and fastened with nuts 5.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, although the spline groove 2 and the spline teeth 4 are press-fitted at the inner and outer peripheries, a gap, that is, backlash, occurs in the circumferential direction. , When a high load or impact load occurs in the rotational direction, the boss 1a and the shaft 3 rattle in the circumferential direction, and the nut 5 that tightens and fixes both loosens and abnormal noises occur. .

The object of the present invention is to provide a novel spline press-fit that eliminates the above-mentioned drawbacks by press-fitting the boss 1a and the shaft 3 with tooth surface pressure.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, in a spline fitting method in which a shaft having spline teeth formed on the outer periphery is fitted to a boss having a spline groove formed on the inner periphery, the spline groove at the end of the boss and the spline teeth at the tip of the shaft are different. The spline groove deep inside the boss and the spline teeth at the base of the shaft are formed with a loose fit dimension around the entire circumference, and the groove width and tooth thickness of a part of the circumferential direction are formed with a tight fit dimension. Along with forming.

The remaining groove width and tooth thickness in the circumferential direction are formed to fit each other with a clearance, and the spline teeth at the shaft tip and the spline groove at the boss end face each other and are press-fitted in the axial direction. It is something.

(Function) Since the present invention has the above configuration, the axial center end of the boss and the outer peripheral tip of the shaft are loosely fitted together on their entire circumferences, and the deep inner part of the boss's axial center and the outer periphery of the shaft In the base part, a part of the spline groove in the circumferential direction and the spline teeth are press-fitted by tooth surface pressure, and the remaining spline grooves and the spline teeth are loosely fitted.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a cross-sectional view of the main part showing an embodiment of the present invention, FIGS. 2 and 3 are enlarged cross-sectional views of ■-■ and ■-■, and FIG. 4 is a cross-sectional view of ■-m of FIG. 1. FIG.

In FIG. 1, 10 is a gear, and a large number of spline grooves 11 extending in the axial direction are formed at equal pitches in the circumferential direction on the inner periphery of the boss 10a.

Each of these spline grooves 11 is 1. The groove of the pitch circle @W
2 and the groove bottom diameter BD2 are each formed in the same shape.

Reference numeral 12 denotes a shaft that fits into the boss 10a, and a large number of spline teeth 13 extending in the axial direction are formed on the outer circumference of the shaft at equal pitches in the circumferential direction.

The right end portion (tip end portion) 13a of the spline tooth 13 is formed to fit loosely into the spline groove 11 over its entire circumference.

That is, as shown in FIG. 2, the tooth thickness T2 and tip diameter SD2 of the pitch circle are formed to be slightly smaller than the groove width W2 and groove bottom diameter BD2 of the pitch circle of the spline groove 2.

Further, the base portion 13b of the spline tooth 13 has a part in the circumferential direction with respect to the spline groove 11 in a tight fit dimension.
Form the remainder to loose fit dimensions.

For example, when forming 24 spline teeth 13 on the outer periphery of the shaft 12, the tooth thickness of the pitch circle of the base 13b is set in the upper and lower directions with point symmetry about the axis O, as shown in FIGS. 4 and 3. three spline teeth 13b on each side and two spline teeth on the left and right sides
The tooth thickness T3 of 1 is the groove width W2 of the pitch circle of the spline groove 11.
Furthermore, the tooth thickness T4 of the remaining 14 spline teeth 13b-2 is formed to be larger than the tooth thickness T2 at the right end and slightly smaller than the groove @W2. do.

Further, SD3 for the tip diameter of the base portion 13b is, as shown in FIG. 3, SD2 for the tip diameter of the right end portion 13a.
It is formed to be larger than the diameter of the groove bottom and smaller than the inside diameter of the groove bottom BD2.

Then, the gear 10 is fitted onto the shaft 12 from the right end side,
It is fastened with a nut 14.

According to the above embodiment, the gear 10 is arranged at the right end of the shaft 12, and the spline groove 11 is connected to the spline tooth 13 of the shaft 12.
When pushed to the left while facing the spline tooth 13, the left end of the spline groove 11 fits smoothly into the right end 13a since the right end 13a of the spline tooth 13 has a clearance fit dimension with respect to the spline groove 11. However, as a result, the gear 10 is positioned coaxially with respect to the shaft 12.

When the gear 10 is further strongly pressed to the left in this state, the spline groove 11 fits up to the base 13b of the spline tooth 13.

In this case, some of the thickly formed spline teeth 13b-1 of the base 13b are press-fitted into the spline groove 11 with tooth surface pressure, and the remaining spline teeth 13b-2 are loosely fitted into the spline groove 11. It will fit.

Therefore, the shaft 12 and the gear 10 are connected to the spline tooth 1.
The part 3b-1 prevents backlash in one circumferential direction. Moreover, since the spline teeth 13b-1 are a part of each spline tooth 13, the load of fitting the gear 10 onto the shaft 12 is reduced.

Note that in the present invention, the width and height of the pitch circle of each spline tooth 13 formed on the outer periphery of the shaft 12 are formed in the same shape, and conversely, the width and height of each spline groove 11 formed on the inner periphery of the boss 10a are The inner end (the left end in FIG. 1) has a loose fit dimension with the spline tooth 13, and a part of the inner deep part in the circumferential direction has a tight fit dimension with the spline tooth 13, and the remaining part is a tight fit dimension with the spline tooth 13. They may each be formed to have a loose fit dimension.

(Effects of the Invention) As is clear from the above description, the present invention allows the fitting of the spline groove and the spline tooth to each other by loosely fitting the entire circumferential area at the entrance portion of both. In the deep part, only a part of the circumference in the circumferential direction is tightly fitted to each other, so while reducing the fitting load between the two, it is possible to prevent rattling in the circumferential direction under high loads or impact loads in the direction of one rotation. This has the effect of preventing loosening of the nut that tightens and fixing the two and preventing the occurrence of abnormal noise.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part showing an embodiment of the present invention, Figures 2 and 3 are enlarged sectional views of ■-■ and ■-■, and Figure 4 corresponds to the ■-■ section of Figure 1. FIG. 5 is a sectional view showing a conventional example. FIG. 6 is an enlarged sectional view taken along VI-VI. 10: Gear, 10a: Boss, 11 Varnish spline groove, 12
: Shaft, 13 spline teeth, 13a: Right end, 13b:
Base, 14: Natsuto. W2: Groove width, T2/T3/T4: Tooth thickness, SD2/SD3
: Within tooth tip diameter, BD2: Groove bottom diameter circle. Figure 5 Application agent Hisashi Matsumoto - Figure 6

Claims (1)

[Claims] 1. In the spline fitting method in which a shaft with spline teeth formed on the outer periphery is fitted to a boss with a spline groove formed on the inner periphery, what is the spline groove on the end of the boss and the spline teeth on the tip of the shaft? The spline groove deep inside the boss and the spline teeth at the base of the shaft are formed with a loose fit dimension around the entire circumference, and the groove width and tooth thickness of a part of the circumferential direction are formed with a tight fit dimension. At the same time, the remaining groove width and tooth thickness in the circumferential direction are formed to fit each other with a clearance, and the spline teeth at the tip of the shaft and the spline groove at the end of the boss face each other and are press-fitted in the axial direction. A spline press-fitting method characterized by: