JPS6367429A - Power transmitting device - Google Patents

Abstract

PURPOSE:To generate large transmission torque, by forming fine ruggedness in a fitting surface of a press fit member with a recessed groove and filling the fitting surface with a friction reducing agent placed in a solidified condition, in the case of a power transmitting device which tightens shafts to each other or the shaft to a rotary unit in a transmitting condition. CONSTITUTION:A fitting surface in a press fit member 2 with a recessed groove 10, that is, an internal peripheral surface of the press fit member 2 and its peripheral surface continuously form fine ruggedness, and each of fine recessed part of said surfaces is filled with a friction reducing agent 4 being placed in a solidified condition. If said press fit member 2 is forced to be inserted into the recessed groove 10 of a rightening unit 1, a transmitting device forces the internal peripheral surface of the press fit member 2 and its peripheral surface by the action of a tapered fitting part to be brought into contact respectively with an internal peripheral surface 12 of the tightening unit 1 and its peripheral wall 11, but the friction reducing agent 4, being distributed to the whole area of these forced contact surfaces, reduces sliding resistance of the forced contact surfaces with each other. Accordingly, transmitting torque, when press fitting force of the press fit member 2 is set to a fixed value, increases to a large value as compared with the torque in the device which interposes no friction reducing agent 4.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a so-called power transmission joint that connects shafts to each other or a shaft and a rotating body in a transmission state. In a power transmission joint consisting of a combination of a fastening body having a shape and a press-fitting body tapered into the groove in the axial direction, the surface of the press-fitting body has a continuous minute unevenness, and the unevenness of the uneven surface is The recess is filled with a solidified anti-friction agent, so that even if the pressing force of the press-fitting body is small, a large torque transmission can be obtained.

[Prior art and its problems] As a power transmission device for fastening a rotating body to a shaft, a ring-shaped fastening body (
1) and a press-fitting body (2) that taper-fits into the groove (10), and these tightening body (1) and press-fitting body (2)
In order to tighten each other in the axial direction, multiple tightening is done by threading bolts (3) and (3) through each other (Japanese Patent Application Laid-open No. 6
1-79008: Figure 6) has already been proposed. This proposal also discloses a structure in which an anti-friction agent (4) is interposed in the tapered fitting part, and according to this structure, tightening is done by tightening the bolts (3) and (3). The pressing force of the press-fitting body (2) is reduced by the effect of the anti-friction agent (4). In other words, the press-fit body (2
) to press fit a certain amount into the groove (10), the tightening torque of the bolt (3) and (3) is smaller than that without applying the anti-friction agent (4).

In addition, in this conventional type, as shown in Fig. 6, the tightening body (1)
Insert the shaft (S) into the inner circumferential side of the clamping body (1).
The rotating body (D) of the rotor (D) is fitted onto the outside, and the outer circumferential wall (11) of the groove (10) expands by press-fitting the press-fitting body (2) to the inner circumferential surface of the shaft hole of the rotary body (D). On the other hand, the inner peripheral wall (
12) is reduced and pressed against the outer circumferential surface of the shaft (S), and as a result, the rotating body (DJ
The torque is transmitted to the shaft (S) and the rotating body (D), and the shaft (S) and the rotating body (D) are connected in a torque transmitting state. This has the advantage that the transmission torque can be set higher than that of the press-fit body (2) when the tightening force of the bolt (3) is constant due to the application of the anti-friction agent (4). In addition to being able to increase the amount of press-fit, the annular wall (13) that directly connects the outer circumferential wall (11) and the inner circumferential wall (12) also serves as a torque transmission element in transmitting torque from the outer circumferential wall (11) to the inner circumferential wall (12). This is because the torque transmitted through the press-fit body (2) is reduced accordingly, and even when the anti-friction agent (4) is applied, the press-fit body (2) and the outer circumferential wall (11) or the inner circumferential wall (12) This is because slippage is less likely to occur between the two.

However, in this conventional type, the press-fit body (2) and the groove (
10), that is, on the outer and inner peripheral surfaces of the press-fit body (2), an assimilated lubricant layer such as molybdenum disulfide is formed on the tapered fitting surface with the clamping body (1). After fastening the rotating body (DJ) to the shaft (S) by combining the press-fit body (2) and the fastening body (1), when the press-fit body (2) is disassembled, the anti-friction agent (4) will peel off. There was the inconvenience that the

Originally, solidified lubricants have a weak bonding force with the target object, and
This is because the tapered fitting surfaces of the press-fitting body (2), the outer peripheral wall (11), and the inner peripheral wall (12) are finished smoothly.

In order to prevent this inconvenience, there is a method of forming a groove on one side of the tapered fitting surface, as disclosed in Japanese Patent Publication No. 59-48888, but even in this conventional method, the groove is formed to some extent. 0.2+n+n~0.4 mm), the effect of preventing the above-mentioned peeling phenomenon is insufficient.

This is because the contact conditions between the surface of the groove and the anti-friction agent (4) are almost the same as those described above.

[Technical Problem] The present invention provides a cylindrical tightening body (1) having a ring-shaped groove (10) that opens in the r-axis direction, and a tightening body (1) that is tapered into the groove (10). A layer of anti-friction agent (4) is interposed in the tapered fitting portion between the tightening body (1) and the press-fit body (2), and the press-fit body (2) The press-fitting body (2
), the transmitted torque is large when the pressing force applied to the press-fitting body (2) and the clamping body (1) are disassembled, and the anti-friction agent (4) is difficult to peel off. Therefore, the technical problem is to increase the contact area between the anti-friction agent (4) and the surface to which it is applied.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned technical problem is that the fitting surface of the press-fit body (2) with the concave groove (10) is formed by a microscopic process such as shot peening. It has a structure in which concave and convex portions are continuous, and each concave portion of the fitting surface is filled with a solidified lubricant (4).

[Action Co. The above technical means of the present invention operates as follows.

Fine irregularities are continuously formed on the fitting surface of the press-fitting body (2) with the concave groove (10), that is, on the inner peripheral surface and the outer peripheral surface of the press-fitting body (2). Each of the recesses is filled with an anti-friction agent (4), and the anti-friction agent (4) is in a solidified state.

When this press-fitting body (2) is press-fitted into the concave groove (10) of the clamping body (1), the inner peripheral surface of the press-fitting body (2) is pressed against the inner peripheral wall of the clamping body (1) due to the action of the tapered fitting part. (12), press fit body (2
) are pressed against the outer peripheral wall (11) of the clamping body (1), but the anti-friction agent (4) filled in the recesses is distributed over the entire area of these press-contact surfaces, and this anti-friction agent The friction-reducing effect (4) reduces the sliding resistance between the press-contact surfaces. Therefore, when the press-fitting body (2) is press-fitted with a constant force, the degree of press-fitting of the press-fitting body (2) becomes deeper compared to when the lubricant (4) is not interposed. Moreover, the component force in the radial direction based on the taper fitting action increases accordingly.

Furthermore, as mentioned above, even if the press-fitting body (2) and the tightening body (1) are once fitted and then disassembled, the anti-friction agent (
4) is filled in minute recesses and is under pressure, so the contact area per unit volume of antifriction agent (4) (contact area with the coated surface or adhesive surface) is smaller than that of the smooth surface. Anti-friction agent (4
) is larger than that applied and solidified.

[effect] Since the present invention has the above configuration, it has the following unique effects.

The anti-friction agent (4) is distributed over almost the entire inner and outer peripheral surfaces of the press-fitted body (2), and the contact area per unit volume of the anti-friction agent (4) (contact area with the coated surface or adhesive surface) is is larger than that of a smooth surface coated with an anti-friction agent (4) and solidified, so when the pressing force of the press-fitting body (2) is constant, the transmitted torque is larger than that of the conventional one. Moreover, anti-friction agent (
4) becomes difficult to peel off from the surface of the press-fit body (2).

In addition, since the surface of the press-fitting body (2) has a continuous unevenness, the processing is easier than when forming the surface on the groove (10) side of the other clamping body (1). , it is also easy to apply the anti-friction agent (4).

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

The joint of the first embodiment has almost the same structure as the conventional joint shown in FIG. 6, and the surface structure of the press-fit body (2) is as shown in FIGS. 1 to 3. Therefore, the overall structure of the joint will be explained with reference to FIG.

First, the tightening body (1) has a concave groove (1) that opens in the axial direction.
0) is formed, and the tightening ring (13) is formed on the opposite side of this open part, and both the inner circumferential surface of the outer circumferential wall (11) and the outer circumferential surface of the inner circumferential wall (12) of the groove (10) are tapered surfaces. The cross section of the groove (10) becomes wider in the radial direction toward the open part.

A plurality of slits (14) are cut in each of the outer circumferential wall (11) and the inner circumferential wall (12), as shown in Fig. 3.
Slits (14), (1) formed in the outer peripheral wall (11)
4) and a slit (14) formed in the inner peripheral wall (12),
(14) They are offset from each other by a certain amount in the circumferential direction.

Next, as shown in Fig. 1, the outer and inner circumferential surfaces of the press-fit body (2) have continuous unevenness over the entire area, and in this example, the press-fit body (2) is made of No. 2) Shot peen the entire inner and outer circumferential surfaces. When the air pressure for discharging shot particles is 5 kg/cm' and the time for spraying shot particles is 5 seconds, a depth of 3.
A micron-sized concave portion is formed, and the top of the convex portion coincides with the base surface (the surface before shot peening). Note that as long as the press-fitting body (2) is made of a commonly used metal material, the recess formed under the same conditions as above will have the same depth as above.

A lubricant made fluidized by a solvent (
When the blended composition of molybdenum disulfide and coagulant (4) is applied and the application amount is set to a predetermined amount, the recesses are filled with the 7-reducing agent (4) as shown in FIG. When the press-fitting body (2) in this state is heated at 140° C. for a certain period of time (40 minutes), the lubricant (4) solidifies and adheres to the surface of the press-fitting body (2).

The amount of this anti-friction agent (4) to be applied may be slightly larger.
When the coating amount of the anti-friction agent (4) is set to such an extent that the top surface of the convex portion of the uneven surface is just buried,
When press-fitting the press-fitting body (2) into the tightening body (1),
The frictional resistance of the sliding part between the press-fitting body (2) and the clamping body (1) is reduced the most, and the pressure contact force in the radial direction is
2) to the outer peripheral wall (11) or inner peripheral wall (1) of the clamping body (1).
2).

Next, the second embodiment shown in FIG. 4 has two axes (S
), (S) A pair of concave grooves (10), (10) are formed to be open at both ends of the clamping body (1), and the concave grooves (10), (10) are connected to each other in a transmission state. A ring (13) is used to tighten between the bottoms of the grooves (10) and (10), and a press-fit body (2) is inserted into each groove (10).
(2) is press-fitted, and the bolts (3) are tightened by passing through one press-fit body (2), and the bolts (3) are tightened by passing through the ring (13) and passing through the other press-fit body (2). It is screwed together.

In this second embodiment, the grooves (10), (10
) is not provided with a shaft (S) on the outer circumferential wall (11) located on the outer circumferential side of the other inner circumferential wall (12).
), and only this inner peripheral wall (12) is provided with a plurality of slits.

Then, an uneven surface is formed on the outer peripheral surface and the inner peripheral surface of this press-fitted body (2) by shot peening similar to that in the first embodiment, and an anti-friction agent (4) is applied and solidified thereon. It is.

In the case of this embodiment, by press-fitting the press-fit bodies (2), (2), torque is transmitted between the shafts (S), (S) by the frictional force caused by the press-contact force of the inner peripheral walls (12), (12). At the same time, since the outer circumferential wall (11) and the inner circumferential wall (12) are connected and integrated by the tightening ring (13), the pressure contact force of the inner circumferential wall (12) is applied to the outer circumferential wall (11) and the tightening ring (13). is larger than that without the ring (13). Moreover, the strength against torsion of the joint is also greater than that of a joint without the outer peripheral wall (11) and the ring (13). Therefore, in this example,
The mutual transmission torque between the shafts (S) and (S) is significantly larger than that of the conventional one.

As shown in Fig. 5, the thickness of the outer peripheral walls (11), (11) is set thin, and the outer peripheral walls (11), (11) are made thin.
If slits (14) and (14) are formed in the joints, it can be used as a joint for fastening a rotating body with a larger transmission torque than the one shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of the present invention, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is a side view of the fastening body (1), and Figs. 4 and 5 are other embodiments. An explanatory diagram of an example.

Claims (1)

[Claims] It comprises a cylindrical fastening body (1) having a ring-shaped groove (10) that opens in the axial direction, and a press-fitting body (2) that taper-fits into the groove (10). By interposing a layer of antifriction agent (4) at the tapered fitting part between the attached body (1) and the press-fit body (2), and press-fitting the press-fit body (2) into the groove (10), the shaft and the shaft are Or, in the case where the shaft and the rotating body are fastened together, the fitting surface of the press-fitting body (2) with the groove (10) has a structure in which minute irregularities formed by shot peening etc. are continuous. A power transmission device in which each of the concave portions of the mating surface is filled with a solidified anti-friction agent (4).