JP2531165Y2 - Shaft coupling - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a shaft coupling comprising a female spline shaft portion and a male spline shaft portion which is spline-inserted and fitted to the female spline shaft portion so as to be relatively non-rotatable and slidable in the axial direction. Things.

[0002]

2. Description of the Related Art In such a conventional shaft coupling, a shaft hole of a female spline shaft portion is communicated with the atmosphere through a small air hole so as to allow relative sliding between the female spline shaft portion and the male spline shaft portion. Along with reducing the resistance, a nipple for lubricating grease is provided outside the female spline shaft, and a high-viscosity lubrication Grease was being supplied.

[0003]

However, in such a conventional shaft coupling, the end of the female spline shaft in the axial direction of the spline shaft hole, which is on the opposite side to the distal end side, is inserted through a small ventilation hole. Due to the communication with the atmosphere, the lubricating grease gradually leaks from the small vents, causing the oil to run out after a long period of use, and the grease must be refilled. Further, since the spline meshing surface is in direct communication with the outside air through the spline shaft hole and the small air hole, water and dust may enter and cause rust and dirt.

Accordingly, an object of the present invention is to provide a shaft coupling that does not require re-lubrication work on the spline meshing surface and does not generate rust and dirt on the spline meshing surface.

[0005]

In order to achieve this object, a shaft coupling according to the present invention is characterized in that the male spline shaft is coaxial with the male spline shaft and the female spline shaft is The end on the side facing the female spline shaft communicates with the shaft hole of the female spline shaft, and the end on the side opposite to the side facing the female spline shaft absorbs internal pressure fluctuations caused by sliding between the spline shafts. An internal hole communicating with the space to be provided is provided, and the internal hole is opened on the end face on the female spline shaft side,
A plurality of radially extending portions extending in the axial direction extending substantially over the length of the teeth of the spline, and being disposed equidistantly from each other in the circumferential direction from the radially enlarged portion and penetrating to the peripheral surface of the teeth of the spline. A hole is provided, and the internal hole is filled with lubricating oil having a high fluidity, and a restricting means for restricting the flow of the lubricating oil in the axial direction is provided. The shaft of the female spline shaft portion communicating with each other by the restricting means is provided. Lubricating oil is sealed in the space of the internal hole including the hole and the radial hole of the male spline shaft.

[0006]

According to this configuration of the present invention, the limiting means provided in the internal hole includes the axial hole of the female spline shaft and the radial hole of the male spline shaft through which the fluid lubricating oil communicates with each other. Lubricating oil is sealed in the space of the internal hole. In addition, the enlarged opening diameter parts are arranged equidistantly from each other in the circumferential direction to form an oil reservoir that ensures that lubricating oil reaches the spline meshing surface through a plurality of radial holes that penetrate to the peripheral surface of the spline teeth. I do. The internal pressure fluctuation absorbing space communicating with the internal hole enables smooth spline sliding.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a preferred embodiment of the present invention.

In the first embodiment shown in FIGS. 1 to 6, a male spline shaft 1 is welded to one end of a hollow pipe 2 and the other end of the hollow pipe is rotatably connected to a cross pin 4 of a universal joint 3. Is welded to the yoke 5. The female spline shaft 6 integrally forms a yoke 9 that is rotatably connected to a cross pin 8 of another universal joint 7. The inner end of the female spline shaft portion on the yoke 9 side of the shaft hole 10 in which the spline internal teeth are formed is closed by a closing plate 11.

A retainer cap 12 for preventing the spline engagement between the male spline shaft 1 and the female spline shaft 6 from being detached is attached to the end 6a of the female spline shaft 6. An oil seal ring 13 is attached to the inner surface of the end of the retainer cap 12. The oil seal ring 13 is slidably brought into contact with the outer peripheral surface of the shaft of the male spline shaft 1 where the spline external teeth are not formed.

The male spline shaft 1 has an internal hole 14 penetrating in the axial direction. The end of the inner hole 14 on the hollow pipe 2 side is closed by a closing plate 15. In addition, one end of the straw pipe 16 is fixed to the center of the closing plate 15 by penetrating it. The straw pipe 16 connects the internal space of the shaft hole 10 and the internal hole 14 of the female spline shaft 6 to the internal space 17 of the hollow pipe 2.

The internal space 17 of the hollow pipe 2 constitutes an internal pressure fluctuation absorbing space for reducing the resistance due to the internal pressure fluctuation of the shaft hole 10 generated when the male spline 1 and the female spline 6 slide on the spline. .

At the end of the internal hole 14 of the male spline 1 which is inserted into the shaft hole 10 of the female spline shaft 6, an enlarged opening diameter portion 18 is provided.
To form A plurality of radial holes penetrating from the enlarged diameter portion 18 to the outer peripheral surface of the spline external teeth of the male spline 1.
19 are formed at equal intervals in the circumferential direction.

The inner space of the shaft hole 10 and the inner hole 14 which are closed by the closing plate 15 and are communicated with each other is filled with a highly fluid lubricating oil 20. Although this internal space communicates with the internal space 17 of the hollow pipe, the position of the free end of the straw pipe 16 and the lubrication to prevent the lubricating oil 20 from flowing into the straw pipe 16 in any use condition of the shaft coupling. Determine the amount of oil 20. Therefore, the lubricating oil is sealed in the inner space of the shaft hole 10 and the inner hole 14. The closing plate 15 of the internal hole 14 constitutes a restricting means for restricting the axial flow of the lubricating oil. The enlarged opening diameter portion 18 forms an oil reservoir for ensuring that the lubricating oil can flow through the radial hole 19 to the spline engagement surface.

FIGS. 1 and 2 show the spline shaft portions extending and contracting in a horizontal state, respectively. FIGS. 3 and 4 show the spline shaft portions inclining toward the female spline shaft side, respectively. FIG. 5 shows the expanded and contracted states.
FIG. 6 and FIG. 6 show a state in which the spline shaft portions extend and contract, respectively, inclined toward the hollow pipe. Thus, in any situation, the lubricating oil 20 does not enter the straw pipe 16 and does not leak outside. Therefore, the lubricating oil is sealed in the inner space of the shaft hole 10 and the inner hole 14.

The free end of the straw pipe 16 is preferably held coaxially with the inner hole 14 by a spacer ring 21 (see FIG. 7) as holding means for press-fitting the inner hole.

The second embodiment shown in FIG. 8 and FIG.
Instead of providing a closure plate 15 at the end of
Plug 22 which is fixed to the portion adjacent to the enlarged diameter portion 18 of the
This embodiment is different from the first embodiment shown in FIGS. 1 to 6 only in that a restricting means for restricting the flow of the lubricating oil in the axial direction is configured.

FIG. 9 shows a state when the shaft coupling of FIG. 8 is rotated. By this rotation, the lubricating oil is pressed against the inner surface of the shaft hole 10 by centrifugal force.

The third embodiment shown in FIGS. 10 to 12 differs from the first and second embodiments in that, instead of providing a closing plate or plug and a straw pipe, the limiting means is constituted by a closing plate 23 provided in a hollow pipe. This is different from the second embodiment. The space between the male spline shaft 1 and the closing plate 23 forms an internal pressure fluctuation absorbing space. 10 to 12 show the extended state, the contracted state, and the rotated state of the shaft coupling, respectively.

In the fourth embodiment shown in FIGS. 13 and 14, the limiting means is provided by a bellows 24 provided at the end of male spline shaft 1 opposite to the side facing the female spline shaft. This embodiment differs from the above-described embodiment in that the internal space of the bellows 24 is used as an internal pressure fluctuation absorbing space. 13 and 14 show the extended state and the contracted state of the shaft coupling, respectively.

The fifth embodiment shown in FIGS. 15 and 16 differs from the fifth embodiment only in that the free end of the bellows 24 is connected to an elastic holding bracket 25 for holding the bellows 24 coaxially with the hollow pipe 2. Is the same as the fourth embodiment. FIG. 15 to FIG. 16
Indicates an extended state and a contracted state of the shaft coupling, respectively.

[0021]

According to the present invention, the limiting means provided in the internal hole includes the internal hole including the axial hole of the female spline shaft and the radial hole of the male spline shaft through which the fluid lubricating oil communicates with each other. Lubricating oil is sealed in the space of the hole, so that lubricating oil does not leak, refilling is not necessary, lubrication of the spline meshing surface throughout the life of the shaft coupling, The lubricating oil that is located at equal intervals from each other and that penetrates to the peripheral surface of the spline teeth to the peripheral surface of the spline ensures that the lubricating oil that has accumulated in the enlarged diameter of the enlarged opening penetrates the spline engagement surface, and that the internal holes absorb internal pressure fluctuations Smooth spline sliding is enabled by communicating with the space.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a first embodiment of a shaft coupling according to the present invention, showing a state in which spline shaft portions are mutually extended in a horizontal state.

FIG. 2 is a partial cross-sectional side view of the first embodiment of the shaft coupling according to the present invention, showing a state in which spline shaft portions are contracted in a horizontal state.

FIG. 3 is a partial cross-sectional side view of the first embodiment of the shaft coupling according to the present invention, showing a state in which the spline shaft portions are extended to be inclined toward the female spline shaft portion side.

FIG. 4 is a partial cross-sectional side view of the first embodiment of the shaft coupling according to the present invention, showing a state where the spline shaft portions are contracted by being inclined toward the female spline shaft portion side.

FIG. 5 is a partial cross-sectional side view of the first embodiment of the shaft coupling according to the present invention, showing a state in which the spline shaft portions are extended to be inclined toward the hollow pipe.

FIG. 6 is a partial cross-sectional side view of the first embodiment of the shaft coupling according to the present invention, showing a state where the spline shaft portions are contracted by being inclined toward the hollow pipe side.

FIG. 7 is a front view of the spacer ring which is press-fitted into the inner hole so as to hold the free end of the straw pipe of the first embodiment of the shaft coupling coaxially with the inner hole;

FIG. 8 is a partial cross-sectional side view of the second embodiment of the shaft coupling according to the present invention, showing a state where the spline shaft portions are extended in a horizontal state.

FIG. 9 is a view showing a situation when the shaft coupling of FIG. 8 rotates.
It is a side view which makes a partial cross section similar to.

FIG. 10 is a partial cross-sectional side view of the third embodiment of the shaft coupling according to the present invention, showing a state where spline shaft portions are mutually extended in a horizontal state.

FIG. 11 is a partial cross-sectional side view of the third embodiment of the shaft coupling according to the present invention, showing a state in which spline shaft portions are contracted in a horizontal state.

FIG. 12 is a diagram showing a situation when the shaft coupling of FIG. 10 rotates.
FIG. 10 is a side view showing a partial cross section similar to FIG.

FIG. 13 is a partial cross-sectional side view of the fourth embodiment of the shaft coupling according to the present invention, showing a state where the spline shaft portions are mutually extended in a horizontal state.

FIG. 14 is a partial cross-sectional side view of the fourth embodiment of the shaft coupling according to the present invention, showing a state in which the spline shaft portions are contracted in a horizontal state.

FIG. 15 is a partial cross-sectional side view of a fifth embodiment of the shaft coupling according to the present invention, showing a state in which spline shaft portions are extended in a horizontal state.

FIG. 16 is a partial cross-sectional side view of a fifth embodiment of the shaft coupling according to the present invention, showing a state where the spline shaft portions are contracted in a horizontal state.

[Description of Signs] 1 Male spline shaft 2 Hollow pipe 3 Universal joint 4 Cross pin 5 Yoke 6 Female spline shaft 7 Universal joint 8 Cross pin 9 Yoke 10 Shaft hole 11 Closure plate 12 Retainer cap 13 Oil seal ring 14 Internal hole 15 Closure plate 16 Straw pipe 17 Internal space 18 Enlarged opening diameter 19 Radial hole 20 Lubrication oil 21 Retainer ring 22 Closure plug 23 Sealing plate 24 Bellows 25 Elastic retention bracket

Claims (6)

(57) [Scope of request for utility model registration] 1. A shaft coupling comprising a female spline shaft portion and a male spline shaft portion which is spline-inserted and fitted into said female spline shaft portion so as to be relatively non-rotatable and slidable in the axial direction. The male spline shaft is coaxial with the male spline shaft, and the end on the side facing the female spline shaft communicates with the shaft hole of the female spline shaft. An end opposite to the side facing the shaft is provided with an internal hole communicating with a space for absorbing internal pressure fluctuations caused by sliding between the spline shafts, and the internal hole has an end surface on the female spline shaft side. A plurality of openings extending in the axial direction substantially over the length of the teeth of the spline, and arranged at equal intervals in the circumferential direction from the enlarged diameter of the spline, and penetrating to the peripheral surface of the teeth of the spline. With two radial holes, The internal hole is filled with lubricating oil having a high fluidity, and restricting means for restricting the flow of the lubricating oil in the axial direction is provided. The axial hole and the male type of the female spline shaft communicating with each other by the restricting means are provided. A shaft coupling characterized in that lubricating oil is sealed in a space of an internal hole including a radial hole of a spline shaft portion. 2. A closing plate provided at an end of the internal hole opposite to a side facing the female spline shaft, and one end penetrating the center of the closing plate. And a straw pipe whose other end is located near an end of the internal hole facing the female spline shaft, and the straw pipe lubricates the internal hole of the closing plate. The lubricating oil-filled space communicates with the internal pressure fluctuation absorption space on the opposite side of the oil-filled space, and the other end of the straw pipe is so connected that lubricating oil does not flow into the straw pipe in any use condition. The shaft coupling according to claim 1, wherein the position and the amount of the lubricating oil are determined. 3. A closing plug fixed to a portion of the internal hole adjacent to the enlarged diameter portion, one end of which is fixed to the center of the closing plug, and the other end is fixed to the center of the closing plug. A straw pipe located in the vicinity of the end of the internal hole facing the female spline shaft, and the straw pipe is provided on the opposite side to the lubricating oil filled space of the internal hole of the closing plug. The lubricating oil filled space is communicated with the internal pressure fluctuation absorbing space, and the position of the other end of the straw pipe and the amount of lubricating oil are determined so that the lubricating oil does not flow into the straw pipe in any use condition. The shaft coupling according to claim 1. 4. The inner hole is provided with holding means for holding the free end of the straw pipe coaxially in the inner hole.
The shaft coupling according to the above. 5. The shaft coupling according to claim 1, wherein said restricting means is constituted by a sealing plate provided in said internal pressure fluctuation space. 6. The bellows provided at an end of the male spline shaft opposite to the side facing the female spline shaft, wherein the bellows internal space absorbs internal pressure fluctuations. The shaft coupling according to claim 1, wherein the shaft coupling is a space.