JPH0749070Y2 - Oldham fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of an Oldham coupling.

[Prior Art] For example, as shown in FIG. 5, an Oldham coupling 15 is interposed between the camshaft 1 and the crank angle sensor 4. As shown in FIG. 6, the Oldham coupling 15 is formed in a columnar shape, and has a camshaft 1 and a crank angle sensor 4 at both ends.
Slits 9 and 10 that are engaged parts that engage with the protrusions 2 and 6 of a single character that are the engaging parts that are respectively formed on the shaft part 5 are formed.

Therefore, the Oldham coupling 15 is attached to the protrusion 6 of the crank angle sensor 4.
When the crank angle sensor 4 is attached to the camshaft 1 by inserting the slit 10 of the Oldham joint 15 into the slit 9 of the Oldham joint 15 and engaging the protrusion 2 of the camshaft 1, the slit 10 of the Oldham joint 15 is inserted into the crank angle sensor 4 It may come off from the protrusion 6 and fall off and it may be difficult to mount. Also, when the crank angle sensor 4 is removed from the camshaft 1, the Oldham coupling 15 also comes off, and at worst, falls inside the engine, that is, inside the Olui pan.

On the other hand, the applicant of the present invention discloses, in Japanese Utility Model Laid-Open No. 63-121823, an Oldham coupling which is interposed between opposed shaft ends and in which slits are formed to engage with protrusions formed on the both shaft ends. In the above, a drop-out prevention means is provided between the slit and the projection, the drop-out prevention means is provided with a small diameter shaft projecting in the axial direction of both projections, and a through hole formed in the Oldham coupling so as to receive these shafts. Or the detachment prevention means is constituted by a magnet embedded in the inner surface of the slit, or the detachment prevention means is constituted by magnets fitted to both ends of a cylindrical case to form a slit. We are proposing a technology to prevent the dropout.

[Problems to be Solved by the Invention] Although the above-mentioned proposed technology is effective, however, the former technology does not provide complete fall-out prevention, and the middle and latter technologies make it difficult to process a magnet. High cost.

An object of the present invention is to provide an inexpensive Oldham coupling that reliably prevents the Oldham coupling from falling off.

[Means for Solving the Problems] According to the present invention, engaged parts are formed between the shaft ends that face each other and that engage with the engaging parts formed on both shaft ends. In the Oldham coupling, fixing means for fixing the Oldham coupling to the shaft end portion of one shaft is provided, and the fixing means is
A threaded portion formed on the outer periphery of one shaft where the engaging portion is formed as a slit, a collar portion formed on the outer periphery of the Oldham coupling in which the engaged portion is formed as a protrusion, and an end surface of the collar portion are engaged. A cap nut that is stopped and screwed into the threaded portion.

Further, according to the present invention, in an Oldham coupling which is interposed between opposed shaft end portions and in which engaged portions which engage with engaging portions formed at both shaft end portions are formed, the Oldham joint is Fixing means for fixing to one shaft end of one shaft is provided, and in this fixing means, the engaging part is formed as a slit, the threaded part formed on the outer periphery of the one shaft, and the engaged part is formed as a protrusion. And a pair of pin portions that are erected vertically on the protruding portion of the Oldham coupling, and a cap nut that locks the pin portions and is screwed into the screw portion.

Further according to the present invention, it is interposed between the opposite shaft ends,
In an Oldham coupling in which engaged portions that engage with the engaging portions formed in both shaft end portions are formed, fixing means for fixing the Oldham joint to the shaft end portion of one shaft is provided, and the fixing means Is a threaded portion formed on the outer periphery of one shaft in which the engaging portion is formed as a slit, a groove portion wider than the slit formed in the inner portion of the slit, and an Oldham in which the engaged portion is formed as a protrusion. The joint comprises an enlarged step portion formed at the tip of the protrusion of the joint so as to be laterally insertable into the groove portion, and a nut screwed to the screw portion.

[Operation] In the Oldham coupling configured as described above, when the protrusion of the Oldham coupling is inserted into the slit of one shaft and the cap nut is screwed into the threaded portion, the collar or pin of the Oldham coupling is capped. The Oldham coupling is locked in the axial direction by being locked at the inner end surface of the nut, and the Oldham coupling is fixed to the end of one shaft, so that the nut is reliably prevented from falling off.

Also, when the enlarged step and protrusion of the Oldham coupling are inserted into the groove and slit of one shaft from the side and the nut is screwed into the threaded portion, the enlarged step of the Oldham coupling is locked in the groove of the shaft. , The Oldham coupling is locked in the axial direction, and the Oldham coupling is fixed to the end of one shaft to prevent the Oldham coupling from falling off.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a slit 21 which is an engaging portion is formed in the end portion of the cam shaft 20, and a screw portion 22 is formed on the outer circumference.

On the other hand, the Oldham coupling 24 is formed with a one-character projecting portion 25 that is an engaged portion, and on the side facing the projecting portion 25, a one-character projecting portion that is an engaging portion of a crank angle sensor (not shown). A slit 28 that engages with is formed. A collar portion 27 is formed on the outer periphery of the Oldham coupling 24 adjacent to the protrusion 25.

Further, a cap nut 30 that is screwed into the screw portion 22 of the cam shaft 20 is provided, and its inner end surface 30a is adapted to lock the end surface of the collar portion 27, and the screw portion 22, the collar portion 27 and the cap nut. The Oldham coupling 24 is connected by 30 to the shaft end of one shaft, that is, the cam shaft.
It constitutes a fixing means for fixing to the shaft end portion of 20.

Therefore, when the protrusion 25 is inserted into the slit 21 and the cap nut 30 is screwed into the threaded portion 22, the Oldham coupling 24 becomes the collar portion 27.
The end surface of is locked in the axial direction by being locked to the inner end surface 30a, and at the same time, the peripheral surface is locked in the axial direction by being locked by the inner circumference of the cap nut 30, from the camshaft 20 of the Oldham coupling 24. Is prevented from falling off.

FIG. 3 shows another embodiment of the present invention, which is an Oldham coupling 24A.
A pair of pin portions 29, 29 which are erected perpendicularly to the axis are formed on the protruding portion 25 of the, and the Oldham coupling 24A is fixed to the shaft end portion of the cam shaft 20 by the pin portions 29, 29, the screw portion 22, and the cap nut 30. It constitutes the fixing means to do.

In this embodiment, in the Oldham coupling 24A, the pin portions 29, 29 are axially locked by being locked at the inner end portion 30a of the cap nut 30, and the tips of the pin portions 29, 29 are the inner circumference of the cap nut 30. And is locked in the direction perpendicular to the axis to prevent the Oldham coupling 24A from falling off the cam shaft 20.

FIG. 4 also shows another embodiment of the present invention, in which a substantially circular groove 23 wider than the projection 25 of the Oldham coupling 24B is formed in the inner part of the slit 21 of the camshaft 20A, and the tip of the projection 25 is formed. Portion, an enlarged step portion 26 that can be inserted into the groove portion 23 from the side is formed, and the groove portion 23, the enlarged step portion 26, the screw portion 22, and the nut 30 fix the Oldham coupling 24B to the shaft end portion of the cam shaft 20. Constitutes a means.

In this embodiment, the Oldham coupling 24B has the enlarged step portion 26 locked in the groove portion 23 and locked in the axial direction, and the side portion of the protruding portion 25 is locked in the inner periphery of the nut 30, and thus in the axial perpendicular direction. And the Oldham coupling 24B is prevented from falling off the cam shaft 20.

In the case of this embodiment, since the enlarged step portion 26 is inserted into the groove portion 23 and locked in the axial direction, it is not necessary to lock the Oldham coupling 24B with the nut 30 in the axial direction. For 30, a normal nut may be used instead of a cap nut.

[Advantages of the Invention] Since the Oldham coupling according to the present invention is configured as described above, the protrusion of the Oldham coupling is inserted into the slit of one shaft, and the cap nut or nut is screwed into the threaded portion. In doing so, the collar portion or the pin portion of the Oldham coupling is locked at the inner end of the cap nut, the Oldham coupling is locked in the axial direction (the invention of claims 1 and 2), and the enlarged step portion of the Oldham coupling is locked. The Oldham coupling is axially locked by being locked in the groove on the shaft side (invention of claim 3), and in any case, the Oldham coupling is fixed to one shaft end by a simple operation. The problem of the Oldham joint falling off when connecting or disconnecting the shaft by the joint is reliably eliminated. Also, the production is relatively simple and can be provided at a low cost.

[Brief description of drawings]

1 and 2 are an exploded perspective view showing a first embodiment of the present invention and a side sectional view at the time of mounting, FIG. 3 is a perspective view showing a second embodiment of the present invention, and FIG. FIG. 5 is an exploded perspective view showing a third embodiment of the present invention, and FIGS. 5 and 6 are views showing a conventional technique. 20, 20A …… Cam shaft, 21 …… Slit, 23 …… Groove, 2
4, 24A, 24B …… Oldham coupling, 25 …… Projection, 26 …… Expanding step, 27 …… Collar, 28 …… Slit, 29 …… Pin, 30 …… Nut or cap nut

Claims (3)

[Scope of utility model registration request] 1. An Oldham coupling which is interposed between opposed shaft ends, and in which an engaged portion which engages with engaging portions formed on both shaft end portions is formed. A fixing means for fixing to the shaft end portion of the shaft is provided, and the fixing means has a threaded portion formed on the outer periphery of one shaft in which the engaging portion is formed as a slit and the engaged portion is formed as a protruding portion. An Oldham coupling comprising: a collar portion formed on the outer periphery of the Oldham coupling, and a cap nut that locks an end surface of the collar portion and is screwed to the threaded portion. 2. An Oldham coupling which is interposed between opposed shaft ends, and in which an engaged portion which engages with engaging portions formed on both shaft end portions is formed. A fixing means for fixing to the shaft end portion of the shaft is provided, and the fixing means has a threaded portion formed on the outer periphery of one shaft in which the engaging portion is formed as a slit and the engaged portion is formed as a protruding portion. An Oldham coupling comprising: a pair of pin portions provided upright on the projection of the Oldham coupling, and a cap nut that locks the pin portions and engages with the screw portion. . 3. An Oldham coupling, which is interposed between opposed shaft ends, and in which an engaged portion is formed which engages with engaging portions formed on both shaft end portions of the Oldham joint. A fixing means for fixing to the shaft end portion of the shaft is provided, and the fixing means is wider than the screw portion formed on the outer periphery of one shaft in which the engaging portion is formed as a slit and the slit formed at the back of the slit. A groove portion, an enlarged step portion formed at the tip of the protrusion of the Oldham coupling in which the engaged portion is formed as a protrusion, and which can be inserted into the groove portion from the side, and a nut screwed to the screw portion. An Oldham coupling characterized by being made of.