JPH066895Y2 - Equipment for manufacturing resin-coated sliding splines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for manufacturing a sliding spline, in which a resin film is formed at a meshing portion of teeth of a male spline and a female spline.

[Conventional technology]

The sliding spline is used in, for example, a telescopic steering column of a vehicle, a propeller shaft sleeve yoke portion, and the like, and the structure thereof is disclosed in Japanese Utility Model Publication No. 55-134373, Japanese Utility Model Publication No. 59-16706, and Invention Institute Publication Technical Report 83. -10085
No.

In this type of sliding spline, it is required to reduce the sliding resistance in the axial direction and reduce the play (play) between the male spline teeth and the female spline teeth of the sliding spline. As a means for this, it has been proposed to inject and solidify a resin into the meshing portion of the teeth of the male spline and the female spline (Japanese Utility Model Publication No. 62-12020, Japanese Utility Model Publication No. 63-173).
No. 26 bulletin).

FIG. 2 shows the sliding spline disclosed in Japanese Utility Model Laid-Open No. 62-12020. In the figure, 1 indicates a male spline and 2 indicates a female spline. Reference numeral 3 denotes a resin (nylon rim) interposed between the male spline 1 and the female spline 2. When the nylon rim 3 is formed, centering is performed by the spigot portions 4 and 5 and the taper portions 6 and 7 provided on the male spline 1 and the female spline 2, so that the nylon rim 3 is uniformly formed in the circumferential direction. It has become.

FIG. 3 shows the sliding spline disclosed in Japanese Utility Model Laid-Open No. 63-17326. In the figure, 11 indicates a male spline and 12 indicates a female spline. Centering of the male spline 11 and the female spline 12 is performed by fitting the female spline tooth 13 and the male spline inlay diameter portion 14 on the female spline opening end side, and the taper 15 at the tip of the male spline 11 and the taper 17 of the jig 16. It is carried out by the agreement with.

At this time, since the spigot diameter portion 14 fits with the minimum diameter of the female spline tooth 13, it is always secured as an air vent opening between the tooth profile outer shape of the female spline and the outer periphery of the spigot diameter portion,
The air between the male spline teeth and the female spline teeth is not compressed when the nylon film is formed. Further, when the nylon film is formed on the male spline 11, the nylon part formed between the taper at the tip of the male spline and the flat surface of the jig has an inner diameter smaller than the minimum diameter of the male film of the male spline tooth part. To form a portion and prevent the nylon film from being displaced in the axial direction. Further, the female spline 12 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 male spline. Can also be applied to a sliding spline having a structure in which the female spline 12 penetrates.

By the way, the conventional manufacturing method cannot be directly applied to the sliding spline in which the spline is provided in the middle of the shaft. Therefore, an apparatus for manufacturing a sliding spline based on the conventional method has been considered.

FIG. 4 shows an apparatus for forming a resin film between a spline and a female spline provided in the intermediate portion of the shaft based on the conventional method. In the figure, 21 indicates a male shaft (relay rod used for four-wheel steering),
31 indicates a female spline. Female spline 31
Is mounted on the fixed plate 41 and positioned at a predetermined position by the positioning means 42. A hole 43 is formed in the fixed plate 41. A positioning shaft 44 is slidably supported in the female spline 31 and the hole 43 of the fixed plate 41. A seal member 45 is located near the lower end of the female spline 31.

A spline 22 is provided in the middle of the male shaft 21. Further, a protruding member 23 extending in the direction perpendicular to the axial direction is formed near the spline 22 of the male shaft 21. A tapered machining reference center hole 27 is formed in one end surface of the male shaft 21. At the lower end of the male shaft 21, a female screw for axially extending ball joint is provided.
24 is formed, and the open end of the female screw 24 is formed in a tapered machining reference center hole 28. Further, the outer peripheral surface of the lower end portion of the male shaft 21 is provided with 2 for engaging a tool.
A face width portion 29 is formed. The machining reference center hole 28 at the lower end of the male shaft 21 has a tapered portion on the positioning shaft 44.
46 is fitted, whereby the male shaft 21 and the female spline 22 are centered.

Next, when the male shaft 21 and the female spline 31 are centered, the positioning shaft 44 and the female spline 31 are
Resin 39 is injected between and. After that, male shaft 21
Is pushed in the direction of arrow B, and spline 22 of male shaft 21
Is meshed with the female spline 31, and a resin film is formed between the teeth of the spline 22 and the tooth of the female spline 31.

[Problems to be solved by the device]

However, the device shown in FIG. 4 also had the following problems.

(A) In order to perform centering between the male shaft 21 and the female spline 31, a gap 47 must be provided between the positioning shaft 44 supported by the fixed plate 41 and the male shaft 21. In the process of pushing 24 in the direction of arrow B, the resin invades the gap 47. for that reason,
The resin adheres to the end surface 25 that serves as the screw seat of the ball joint, which causes a problem that reliable tightening cannot be guaranteed.

(B) Further, since the resin also adheres to the two-face width portion 29 of the male shaft 21, the tool cannot be engaged and the function of the two-face width portion 29 is lost.

(C) The resin comes into the gap between the positioning shaft 44 and the hole 43 for centering the male shaft 21, and the positioning shaft 44 cannot move.

(D) A step is formed at the contact portion between the positioning shaft 44 and the male shaft 21, and this step portion is a rubber seal member.
Since it passes through 45, the seal member 45 wears quickly, which causes a problem in terms of maintenance cost.

The present invention focuses on the above points, and even if it is a sliding spline in which a spline is provided in the middle of the male shaft, the resin is not attached to the end of the male shaft, and the spline between the male shaft and the female spline is An object of the present invention is to provide a manufacturing apparatus for a sliding spline capable of forming a uniform resin film.

[Means for Solving the Problems]

According to the present invention, there is provided a resin-coated sliding spline manufacturing apparatus according to the present invention, wherein a first positioning means for positioning the female spline at a predetermined position and one of the male shafts provided with a male spline in the middle are provided to the female spline. Second for concentric positioning
Positioning means, third positioning means for concentrically positioning the other of the male shafts that are inserted into the female spline and project from the female spline with respect to the female spline, and the other of the male shafts is insertable and the female Sealing means for receiving the resin injected into the gap between the spline and the male shaft; and guide means for moving the second positioning means and the third positioning means together to guide the spline of the male shaft to the female spline. , Which are equipped with.

[Action]

In the resin-coated sliding spline manufacturing apparatus configured as described above, the female spline is positioned at a predetermined position by the first positioning means. When the female spline is positioned, the other of the male splines is inserted into the female spline, and its tip is projected from the female spline and the sealing means. The portion protruding from the female spline is positioned by the third positioning means. One of the male splines is positioned by the second positioning means.

The male spline is positioned so as to be concentric with the female spline by the second positioning means and the third positioning means. That is, the male spline and the female spline are centered. In this case, since the spline of the male shaft and the female spline are not meshed with each other, there is a gap between the male shaft and the female spline, and the resin is injected into this gap. Since one of the gaps is closed by the sealing means, the injected resin will not leak out.

After that, the male shaft axially moves along the guide means while being positioned by the second positioning means and the third positioning means, and the spline of the male shaft meshes with the female spline without misalignment. Therefore, the resin film formed between the spline of the second shaft and the female spline is also uniform.

Since the other side of the male shaft is positioned in advance so as to project from the female spline and the sealing means,
The resin does not adhere to the end of the male shaft.
In addition, the sealing means is not damaged by the step portion or the like when the male shaft moves, and the durability of the sealing means is improved.

〔Example〕

A preferred embodiment of a resin-coated sliding spline manufacturing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Since the male shaft and the female spline in this embodiment are similar to those shown in FIG. 4, the corresponding parts are denoted by the same reference numerals as those in FIG. 4 and the description of the corresponding parts is omitted, and only the different parts are described. .

In FIG. 1, reference numeral 51 denotes a base, and a fixing plate 52 is located above the base 51 in the horizontal direction. Fixed plate 52
Are fixed to the base 51 via side plates 53. Fixed plate
The female spline 31 is mounted on 52. Fixed plate 52
A through hole 54 is formed in a portion of the female spline 31 where the female spline 31 is arranged. At one end of the through hole 54, a seal member 55 made of rubber is provided as a seal means capable of contacting the end surface of the female spline 31. The inner peripheral surface of the seal member 55 is capable of sliding contact with the straight shaft portion 30 of the male shaft 21.

The female spline 31 is positioned at a predetermined position by the first positioning means 61. The first positioning means 61 comprises a centering shaft 62 and a positioning plate 63. The lower part of the centering shaft 62 is a fixed plate.
It is fixed to 52 and the positioning plate 63 is a centering shaft.
It is attached to 62 so that it can slide. Female spline 31
The outer peripheral surface is held by the positioning plate 63, and the axial center of the female spline 31 and the axial center of the through hole 54 of the fixed plate 52 are aligned at the time of positioning. When the resin film is formed, the axis of the female spline 31 positioned by the first positioning means 61 is aligned with the axis of the second positioning means 81 and the axis of the third positioning means 91 which will be described later. It

In the vicinity of the first positioning means 61, a pillar 71 fixed to the base 51 and the fixing plate 52 and extending upward is provided as a guide means 71.
Is located. The pillar 71 has, for example, a rectangular cross section, and the axis of the pillar 71 and the axis of the female spline 31 are parallel to each other.

One of the male shaft 21 and the female spline 31
A second positioning means 81 for concentrically positioning is provided movably. The second positioning means 81 is composed of a movable plate 82 and a protrusion 83. One of the movable plates 82 is inserted through the slide member 84 into the support column 71 without play. On the other side of the movable plate 82, there is fixed a conical projection member 83 that fits into the processing reference center hole 27 formed on one end surface of the male shaft 21. A stopper 85 that prevents the movable plate 82 from coming off the pillar 71 is provided at the upper end of the pillar 71.

Third positioning means for positioning the other side of the male shaft 21 concentrically with respect to the female spline 31 on the lower portion of the column 71.
91 is movably provided. That is, the third positioning means 91 is located between the base 51 and the fixed plate 52. The third positioning means 91 is composed of a movable plate 92 and a protrusion 93. One side of the movable plate 92 is inserted into the support column 71 through the sliding member 94 without play. On the other side of the movable plate 92, there is fixed a projection 93 having a conical tip which is fitted to the processing reference center hole 28 formed on the other end surface of the male shaft 21. The protruding portion 93 can be inserted into the through hole 54 of the fixed plate 52, and in the inserted state, is fitted into the machining reference center hole 28 of the male shaft 21 protruding from the female spline 31.

Although omitted in this embodiment, if the third positioning means 91 is urged upward by the urging means and the second positioning means 81 is connected to the 9. means such as an air cylinder, the spline is moved to the spline. It is possible to automate the resin coating work.

Next, the operation of the apparatus for manufacturing the above resin-coated sliding spline will be described.

As shown in FIG. 1, first, the female spline 31 is a fixed plate.
The female spline 31 is placed on the 52 and is positioned at a predetermined position by the first positioning means 61. In this state, the lower end of the female spline 31 is brought into contact with the seal member 55.

When the positioning of the female spline 31 is completed, the other shaft portion 30 of the male shaft 21 is inserted into the female spline 31, and the other shaft end of the male shaft 21 is projected from the female spline 31 and the seal member 55. In this case, the male shaft 21
Are heated to about the same temperature as the polymerization temperature of the resin. In this state, the upper end of the male spline 21 is positioned by fitting with the protrusion 83 of the second positioning means 81,
The lower end of the male spline 21 is positioned by fitting with the protrusion 93 of the third positioning means 91. This completes the centering of the male shaft 21 and the female spline 31. In this state, resin 39 is injected into the gap 38 between the shaft portion 30 of the male shaft 21 and the female spline 31 by a resin injection means (not shown). In this case, since the lower end of the female spline 31 is in contact with the seal member 55, the gap
The resin injected into 38 does not leak outside.

Next, the second positioning means 81 and the third positioning means 91
And are moved along a pillar 71 as a guide means.
That is, the male shaft 21 is moved in the axial direction (direction of arrow A) while being sandwiched between the means 81 and 91,
The splines 22 of 21 are meshed with the female splines 31 without misalignment. In this case, the resin 37 injected into the gap 38
Is formed around the spline 22 of the male shaft 21 with a uniform thickness. Further, since the upper end opening of the female spline 31 functions as an air vent opening, the spline 22 of the male shaft 21 and the female spline 31 are formed when the resin film is formed.
No air is enclosed between the and.

Further, since the lower end of the male shaft 21 projects from the female spline 31 and the seal member 55, the male shaft 21
The resin is prevented from adhering to the end surface 25 and the two-face width portion 29, and the function of each portion of the male shaft 21 is as desired. Further, since the resin 39 hardly leaks into the through hole 54 of the fixing plate 52, the third resin is attached to the through hole 54.
The positioning means 91 of does not get stuck.

When the formation of the resin film is completed, the second positioning means 81 and the third positioning means 91 are moved in a direction away from the male shaft 21, and the positioning of the female spline 31 by the first positioning means 81 is also released.

[Effect of device]

As described above, according to the resin-coated sliding spline manufacturing apparatus of the present invention, the other of the male shafts is projected from the female spline and the sealing means, and the centering of the male shaft and the female shaft is performed by each positioning means. Since the resin film is formed by performing the above process, it is possible to uniformly form the resin film and reliably prevent the resin from adhering to the shaft end portion to which the resin should not adhere.

Further, since only the shaft portion of the male shaft is inserted into the sealing means, damage to the sealing means due to the stepped portion caused by positioning can be prevented, and the durability of the sealing means can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a manufacturing apparatus for a resin-coated sliding spline according to an embodiment of the present invention, FIG. 2 is a sectional view of a sliding spline disclosed in Japanese Utility Model Laid-Open No. 62-12020, and FIG. FIG. 4 is a sectional view of the sliding spline disclosed in Japanese Laid-Open Patent Publication No. 63-17326, and FIG. 4 is a sectional view showing an example of a manufacturing apparatus for the sliding spline in which the spline is located in the middle of the shaft. 21 …… Male shaft 31 …… Female spline 55 …… Seal means (seal member) 61 …… First positioning means 71 …… Guide means 81 …… Second positioning means 91 …… Third positioning means

Claims (1)

[Scope of utility model registration request] 1. A first positioning means for positioning the female spline at a predetermined position, and a second positioning means for concentrically positioning one of the male shafts provided with an intermediate male spline with respect to the female spline.
Positioning means, third positioning means for concentrically positioning the other of the male shafts that are inserted into the female spline and project from the female spline with respect to the female spline, and the other of the male shafts is insertable and the female Sealing means for receiving the resin injected into the gap between the spline and the male shaft; and guide means for moving the second positioning means and the third positioning means together to guide the spline of the male shaft to the female spline. An apparatus for manufacturing a resin-coated sliding spline, comprising: