JPH0449375Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention consists of a female spline having female spline teeth on the inner periphery of a cylindrical body, and a female spline inserted into the female spline and sliding in the axial direction with the female spline teeth at the tip. The present invention relates to a sliding spline comprising a male spline having male spline teeth that are movably but non-rotatably slidably engaged around an axis.

[Prior Art] The above-mentioned sliding spline is used, for example, in telescopic steering columns of vehicles, propeller shaft sleeve yoke parts, etc.
No. 134373, Japanese Utility Model Application Publication No. 59-167062, and Technical Report No. 83-10085 of Japan Institute of Invention and Innovation show structures in the vicinity of such types of sliding splines.

This type of sliding spline is required to reduce sliding resistance in the axial direction as well as play (backlash) between the male spline teeth and female spline teeth of the sliding spline.

In order to satisfy this requirement, the applicant of this utility model registration has injected a nylon rim 3 into the meshing part of the teeth of the male spline 1 and the female spline 2, as shown in FIG. Proposals have been made to solidify it. In order to align the axes of the male spline 1 and female spline 2 when forming the nylon rim 3, the tip of the male spline 1 and the bottom of the female spline 2, which is a blind hole, are placed mutually. A cylindrical spigot part 6 that forms tip tapers 4 and 5 that taper engage to center the tip side of the male spline, and further spigot-fits the male spline 1 and the female spline 2 on the open end side of the female spline 2. , 7 to center the opening end side, and the nylon rim 3 was formed uniformly.

[Problems to be Solved by the Invention] However, it has been found that the sliding spline having the structure shown in FIG. 5 has the following points that should be further improved.

A: First, there were the following problems with the open end spigot parts 6 and 7.

First, it is necessary to machine the cylindrical spigot parts 6 and 7 on the male spline side and the female spline side with high precision, leading to an increase in parts cost and a decrease in productivity.

(b) When inserting the male spline 1 into the female spline 2 and finally pushing it in the axial direction for centering, the male spigot part 6 ends up covering the female spigot part 7, and the air inside does not escape and is compressed. If you do not continue to press the male spline 1 while applying axial force for about 5 minutes until the nylon rim 3 hardens, the male spline 1 will return in the axial direction and the gap between the male spline 1 and the female spline 2 will There was a problem with the center being misaligned.

B Next, there were the following problems with the tip tapers 4 and 5. That is, although the adhesion reliability of the nylon resin 3 bonded to the spline teeth of the male spline 1 is sufficiently ensured by primer treatment, etc., the conventional method of centering lacks a device to further increase reliability. In other words, in the unlikely event that the adhesive strength is insufficient, the nylon film will shift in the axial direction since there is no axial anchor in the tapered end portion.

C There were also the following problems with the overall structure. That is, the male spigot part 6 on the opening side
Since the diameter is configured to be larger than the small diameter of the teeth of the female spline 2, the amount of axial sliding of the male spline 1 is limited until the step portions of the opening spigots 6 and 7 come into contact. Therefore, in this configuration, the male spline 1 is connected to the female spline 2.
It could not be applied to a spline structure that passes through and slides in the axial direction.

In order to solve the above-mentioned problems, the present invention provides a sliding spline in which a nylon film is formed on the female spline meshing part of the male spline.
The air between the male spline teeth and the female spline teeth is released when the nylon film is formed, and the nylon film formed on the male spline teeth is a sliding spline that does not easily shift from the male spline teeth in the axial direction, and the male spline is a female spline. It is an object of the present invention to provide a sliding spline that can be applied to a spline structure that passes through and exits.

[Means for solving the problem] A sliding spline for achieving the above purpose includes a female spline having female spline teeth on the inner periphery of a cylindrical body, and a female spline inserted into the female spline and having female spline teeth and a shaft near the tip. and a male spline having a cylindrical surface portion on the opposite side of the tip from the male spline tooth, the male spline having male spline teeth that are slidable in the direction and non-rotatably meshed around the axis, and at least the male spline tooth of the male spline. In the sliding spline with a nylon film formed on it, insert the male spline into the female spline, and insert the outer circumferential surface of the male spline at a position corresponding to the opening end of the female spline on the cylindrical surface of the male spline to fit into the minimum diameter of the female spline tooth. The diameter part of the centering spigot is formed into a bulge, and the cylindrical shaft is connected and fixed to the female spline at the tip of the male spline.The centering spigot is inserted into the cylindrical shaft when forming the nylon film, and is removed after the nylon film is formed. A jig having a widening taper whose center line coincides with the center line of the female spline and a flat surface substantially perpendicular to the center line at the open end of the taper, forming a contracting taper at the tip that engages the widening taper. Then, from the sliding spline, the ring-shaped nylon part formed in the area surrounded by the tapered tip of the male spline, the female spline, and the flat surface of the jig is fixed to the male spline together with the nylon film formed on the male spline teeth. Become.

[Function] In the sliding spline of the present invention, the male spline and female spline are aligned by fitting the female spline teeth on the open end side of the female spline with the male spline spigot diameter, and by adjusting the taper of the male spline tip. This is done by engaging the taper of the tool.

At this time, the spigot diameter part fits with the minimum diameter of the female spline tooth, so the space between the tooth profile of the female spline and the outer periphery of the spigot diameter part is always secured as an air bleed opening, and when the nylon film is formed, the male spline tooth and the female The air between the spline teeth is not compressed. In addition, when the nylon film is formed on the male spline, the nylon part formed between the taper at the tip of the male spline and the flat surface of the jig forms an anchor part with an inner diameter smaller than the minimum diameter of the nylon film on the male spline teeth. , which prevents the nylon membrane from shifting in the axial direction. Furthermore, the female spline has a penetrating structure, and a jig separate from the female spline is inserted into the cylindrical shaft connected to the female spline to center the tip of the male spline. It can also be applied to sliding splines that have a structure that slides through them.

[Example] Hereinafter, a sliding spline according to a preferred example of the present invention will be described with reference to the drawings.

In Fig. 1, 10 is a female spline, 20
is a male spline inserted into a female spline,
30 indicates a jig inserted into the cylindrical shaft connected to the female spline.

As shown in FIGS. 1 and 2, the female spline 10 is composed of a cylindrical body 11 having female spline teeth 12 on the inner periphery. Female spline 1
One end 13 of 0 is open, and a male spline 20 is inserted from the open end side. Female spline 1
0, another hollow cylindrical shaft 15 is fixed coaxially with the female spline 10 by welding 16 or the like. The female spline teeth 12 span the entire length of the female spline 10.

As shown in FIGS. 1 and 3, the male spline 20 has male spline teeth 21 over a certain distance from the vicinity of the tip, and has a cylindrical surface portion 22 on the opposite side of the male spline tooth 21 from the tip. The male spline teeth 21 are slidably engaged with the female spline teeth 12 of the female spline 10 so as to be slidable in the axial direction but not rotatable around the axis. The length of the male spline tooth 21 is smaller than the length of the female spline tooth 12, and the cylindrical surface portion 22 of the male spline 20 corresponds to the vicinity of the open end 13 of the female spline 10. The outer peripheral diameter of the cylindrical surface portion 22 is smaller than the small diameter of the female spline tooth 12, and a radial gap exists between the two. The cylindrical surface portion 22 also extends outward from the open end 13 of the female spline 10.

The cylindrical surface portion 22 of the male spline 20 has a centering member at a position axially corresponding to the open end portion 13 of the female spline 10, which has a cylindrical outer circumferential surface that fits into the minimum diameter of the female spline tooth 12. The pilot diameter portion 23 is formed to bulge in the radial direction.

A tip constriction taper 24 whose diameter decreases toward the tip is formed at the tip of the male spline 20 so that its axis coincides with the axis of the male spline 20 . The tip of the taper 24 forms an end face 25 cut off in a plane perpendicular to the axis of the male spline 20. The diameter of the minimum diameter portion of the taper 24 is naturally smaller than the minimum diameter of the male spline tooth 21.

A jig 30 is inserted into the cylindrical shaft 15 connected to the female spline 10 when forming a nylon film on the male spline 20, and is taken out after forming the nylon film. Although the jig 30 is not a component of the sliding spline, it is used during manufacturing. The jig 30 slides on the inner periphery of the cylindrical shaft 15 and connects the female spline 10.
It has an outer peripheral surface that is aligned with the male spline 2.
A tip expanding taper 31 that widens toward the jig tip is formed at the tip on the side opposite to the jig. The center line of the tip expanding taper 31 coincides with the axis of the female spline 10. The expansion angle of the tip expansion taper 31 is the same as the angle of the tip contraction taper 24 at the tip of the male spline 20, and they are closely engaged with each other in a male and female relationship, and the center alignment of the tip side of the male spline 20 is I'm starting to be able to do it. The tip of the tip expanding taper 31 is an end face cut off by a flat surface 32 perpendicular to the axis of the jig 30.
The diameter D ₁ of the cylindrical intersection line between the flat surface 32 and the widening taper 31 is smaller than the minimum diameter D ₂ of the male spline tooth 21, as shown in FIG.

During production, molten nylon 40 is put into the space surrounded by the female spline 10 and the jig 30, and the male spline 20 is inserted, and the tip curling taper 24 at the tip of the male spline 20 is inserted into the jig 3.
When the nylon 40 is engaged with the tip widening taper 32 at the tip of the
and the female spline tooth 12, and is further pushed out between the cylindrical surface portion 22 and the female spline tooth 12, cooled and solidified, and formed into the male spline tooth 21 as shown in FIG. A nylon membrane 40 is firmly formed. In this case, the surfaces of the male spline 20 and the female spline 10 are coated with a primer so that the nylon 40 is fixed only to the male spline 20 side. Further, on the distal end side of the male spline 20, a link is surrounded by a flat surface 32 at the distal end of the jig 30, a portion of the distal end curling taper 24 of the male spline 20 that does not come into close contact with the female taper 31, and the female spline 10. Nylon 40 remains in the shaped space, and the nylon 40 cooled and solidified there forms a ring-shaped nylon portion 41. The ring-shaped nylon portion 41 is integrally connected to a thin nylon film 40 formed on the male spline tooth 21. FIG. 4 shows a perspective view of a nylon film 40 and a ring-shaped nylon portion 41 formed on the male spline 20. As shown in FIGS. 1, 3, and 4, the minimum diameter D ₁ of the ring-shaped nylon portion 41 is smaller than the minimum diameter D ₂ of the male spline tooth 21. As shown in FIGS. Male spline 2
Of course, the nylon portion 42 remains on the end face 25 at the tip of the 0, and is fixedly formed thereon, but this is a part of the manufacturing process and is not particularly necessary from a functional point of view, and may be removed later. Male spline 20 tip curl taper 2
In the part of the jig 30 in No. 4 that comes into close contact with the taper 31,
No nylon film 40 is formed.

Next, the operation of the sliding spline configured as described above will be explained.

The male spline 20 and the female spline 10 are
When forming the nylon membrane 40, they must be aligned with each other. This is achieved by the engagement of the contracted taper 24 and the widening taper 31 of the jig 30.

During this alignment, there is a space left between the centering spigot diameter portion 23 and the female spline tooth 12 that is not filled with the tooth profile of the female spline tooth 12, so when the male spline 20 is inserted, Male spline 20 and female spline 10
The air between them escapes to the outside through the space, and the trapped air does not interfere with the insertion of the male spline 20, resulting in smooth alignment.

Further, the ring-shaped nylon part 41 fixedly formed at the tip of the male spline 20 is integrally connected to the nylon film 40 formed on the surface of the male spline tooth 21, and the minimum diameter D thereof is the same as that of the male spline tooth 21.
Since the diameter is smaller than the minimum diameter D ₂ of will increase.

Furthermore, by using the jig 30, the tip side of the male spline 20 can be aligned, and there is no need to make the female spline a blind hole structure in order to align the back side of the female spline as in the past. A spline 10 penetration structure can be adopted.

[Effects of the invention] Therefore, when using the sliding spline of the present invention, it is possible to prevent air from being trapped when the male spline is inserted, and to prevent the nylon film formed on the male spline from shifting relative to the male spline. can be slidable axially through the female spline.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a sliding spline according to an embodiment of the present invention, also showing a jig used only during manufacturing, Fig. 2 is a sectional view of the female spline and jig in Fig. 1, and Fig. 3 is a cross-sectional view of the male spline and nylon membrane in FIG. 1, FIG. 4 is a perspective view of the vicinity of the tip of the male spline in FIG. 3, and FIG.
FIG. 2 is a cross-sectional view of the slip spline proposed earlier. 10...Female spline, 12...Female spline tooth, 20...Male spline, 21...Male spline tooth, 22...Cylindrical surface portion, 24...Tip curl taper, 30...Jig, 31...Tip Spreading taper, 32...Flat surface, 40...Nylon, 4
1...Ring-shaped nylon part.

Claims (1)

[Scope of utility model registration request] A female spline having female spline teeth on the inner periphery of the cylindrical body, and a male spline tooth inserted into the female spline near the tip and meshing with the female spline teeth so as to be slidable in the axial direction and non-rotatable around the axis. In a sliding spline comprising a male spline having a cylindrical surface portion on the opposite side of the tip portion from the male spline tooth, and a nylon film is formed on at least the male spline tooth of the male spline, the male spline is inserted into the female spline, and the male spline is inserted into the female spline. At a position corresponding to the opening end of the female spline on the cylindrical surface of the cylindrical surface, a centering spigot diameter portion having an outer circumferential surface that fits into the minimum diameter of the female spline tooth with the spigot is formed to bulge out, and at the tip of the male spline, A widening taper whose center line coincides with the center line of the female spline is inserted into the cylindrical shaft to be connected and fixed and is removed after the nylon film is formed at the tip facing the male spline, and at the open end of the taper. A tip converging taper that engages with the tip widening taper of a jig having a flat surface substantially orthogonal to the center line is formed in a portion surrounded by the male spline tip taper, the female spline, and the jig flat surface. A sliding spline characterized in that a ring-shaped nylon part is fixed to a male spline integrally with a nylon film formed on the male spline teeth.