JPH0348419Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fixing bolt, and more particularly to an improvement of a fixing bolt that uses a soft metal ring and liquid packing to improve the lubricating oil leak prevention function.

(Prior art) Conventionally, a rotating body is positioned at the end of a rotating shaft using a keyway, and when the rotating body is fixed, lubricating oil transmitted through the keyway is prevented from leaking to the outside. Therefore, a fixing bolt having a high fastening force and having a soft metal ring fitted into the fitting part is used (see, for example, Japanese Utility Model Application Publication No. 176914/1983).

On the other hand, in this type of fixing bolt, in order to further improve the sealing performance, it is customary to apply liquid packing between the soft metal ring and the fixing bolt.

However, in the above method, when the fixing bolt is fastened, the soft metal ring is removed from the fitting part.
If the fixing bolt is sometimes detached and the fixing bolt is tightened in that state, the fixing bolt may be incorrectly assembled (in other words, it is improperly fastened)
There was a problem of causing To solve this problem, it may be possible to simply press-fit the soft metal ring into the fitting part, but in this case, the liquid packing applied to the soft metal ring may be partially pushed out by the fitting part. The lubricating oil leakage prevention function may deteriorate due to the flatness of the soft metal ring being distorted.

(Purpose of the invention) The present invention was made in view of the above-mentioned conventional problems, and it is possible to prevent the soft metal ring from separating from the fitting part when fastening the fixing bolt without deteriorating the lubricating oil leakage prevention function. It is an object of the present invention to provide a structure for attaching a rotating body to a rotating shaft with high reliability and durability, which can prevent incorrect assembly of fixing bolts caused by fixing bolts.

(Structure of the invention) In order to achieve the above object, the present invention positions a rotating body using a key inserted into a keyway at the end of a rotating shaft, and aligns the rotating body parallel to an end surface perpendicular to the rotational axis of the rotating body. A fixing bolt having a flange portion and screwed onto the rotating shaft is fitted into the fitting portion of the fixing bolt,
The rotating body is fastened to the rotating shaft via a soft metal ring interposed between the flange portion and the end face of the rotating body, and the lubricating oil leaking from the keyway connected to the lubricating oil distribution portion is In the mounting structure of the rotating body to the rotating shaft configured to seal with a liquid seal applied between the soft metal ring and the fixing bolt, the soft metal ring is located closer to the rotating body than the soft metal ring in the fitting part. A protrusion larger than the inner diameter is provided, and an annular groove smaller than the inner diameter of the soft metal ring is provided at the fitting portion on the side opposite to the rotating body from the protrusion.

(Effect of the invention) With the structure described above, the annular groove allows liquid packing to be secured around the entire circumference of the fitting part, while maintaining the lubricating oil leakage prevention function. By being able to prevent the metal ring from coming off the fitting portion, loosening of the fixing bolt due to incorrect assembly of the fixing bolt can be prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. The drawings all show the present invention applied to a rotary piston engine. In FIG. 1, a rotary piston engine 1 has an eccentric shaft 4 inside a working chamber formed by a rotor housing 2 having a trochoidal inner peripheral surface and side housings 3 disposed on both sides of the rotor housing 2. The rotor 5 supported by the rotor 5 is configured to rotate planetarily. The eccentric shaft 4 has one end connected to the side housing 3.
A stationary gear 7a is fixed to the stationary gear 7a, and the other end meshes with the internal gear 6 provided on the rotor 5 side.
The stationary gear member 7 is supported on the inner circumferential surface of the stationary gear member 7 via a metal 8 serving as a bearing portion.
Further, a thrust bearing 9 is fixed to the end portion of the stationary gear member 7 on the mounting portion side. On the front side (to the left in the figure) of this thrust bearing 9, there are a balance weight 10, a drive gear 11 for an oil pump (not shown), a drive gear 13 for driving a shaft 12a of a metering oil pump 12, and a supplementary gear 13 for driving a shaft 12a for a metering oil pump 12. Pulleys 14 for driving the machine are arranged in sequence, and these are all positioned by a single key 15 inserted into a keyway 4a formed in the eccentric shaft 4.
Finally, it is fixed with fixing bolts 16.
The eccentric shaft 4 is also connected from the oil passage 3a formed in the side housing 3 through the oil hole 7b formed in the stationary gear 7.
The oil reaching the bearing portion lubricates the bearing portion, and then the thrust bearing 9 is lubricated by the end flow. Further, as shown in FIGS. 2, 3a and 3b, the fixing bolt 6 is fixed so that the oil flowing in the oil passage 4b formed in the eccentric shaft 4 is connected to the temperature-sensitive valve 1.
a recess 16a into which a seal ring for sealing oil leaked to the front side through the recess 16a is fitted;
A threaded portion 16b, a fitting portion 16c to which a copper washer 18 serving as a positioning function and a soft metal ring for the fixing bolt 16 with respect to the eccentric shaft 4 is screwed, a bolt head 16d, and a portion parallel to the end surface 4c of the eccentric shaft 4. flange part 1
6e. Further, a liquid packing 19 is interposed between the copper washer 18 and the fitting portion 16c in order to improve sealing performance. The relationship between the copper washer 18 and the fitting portion 16c is such that, as shown in FIGS. 3a and 3b, the inner diameter of the copper washer 18 is located closer to the pulley (see FIG. 1) 14 as a rotating body than the copper washer 18. A larger protrusion 160c is provided, and an annular groove 161c smaller than the inner diameter of the copper washer is provided in the fitting portion 16c on the front side of the protrusion 160c. This annular groove 161c is provided when the fixing bolt 16 is ground, and the protrusion 1
60c is the state shown in FIG. 3b when the copper washer 18 is fitted to the fitting portion 16c, and as shown in FIG.
By forming 2c, caulking is performed.

Because of the above structure, even when the copper washer 18 is press-fitted into the fitting portion 16c, the annular groove 161c allows the liquid packing 19 to be transferred to the groove 161c.
The oil that lubricates the above-mentioned thrust bearing 9 can be secured in the keyway 4a.
The fitting portion 16 of the copper washer 18 is maintained by the above-mentioned copper washer 18 and the securely secured liquid packing 19 while maintaining the lubricating oil leak prevention function.
By preventing the fixing bolt 16 from coming off from c, it is possible to prevent the fixing bolt 16 from loosening due to incorrect assembly.

In the above embodiment, the protrusion 160c is formed by caulking the hole 162c on the outer periphery of the side surface of the fitting portion 16c, but the number of holes is not particularly specified. However, productivity is better with about two pieces. Furthermore, the protrusion 160c is not limited to being caulked, and may be a separate piece.

[Brief explanation of the drawing]

1, 2, 3a and 3b show embodiments of the present invention, FIG. 1 is a partial sectional view of a rotary piston engine, and FIG. 2 is a fixed The enlarged views of the bolt, FIGS. 3a and 3b, are both enlarged cross-sectional views of the portion A in FIG. 2. 4...Eccentric shaft (rotating shaft),
4a...Keyway, 4c...End face, 8...Metal (bearing part), 10...Balance weight (rotating body),
11, 13... Drive gear (rotating body), 14...
Pulley (rotating body), 15...key, 16...fixing bolt, 16c...fitting part, 16e...flange part, 160c...protruding part, 161c...annular groove, 18...copper washer (soft metal ring), 1
9...Liquid Patsukin.

Claims (1)

[Claims for Utility Model Registration] A rotating body is positioned at the end of the rotating shaft by a key inserted in a key groove, and has a flange portion parallel to an end surface perpendicular to the rotational axis of the rotating body, The fixing bolt that is screwed onto the shaft connects the rotating body to the rotating shaft through a soft metal ring that is fitted into the fitting part of the fixing bolt and interposed between the flange part and the end face of the rotating body. A structure for mounting a rotating body on a rotating shaft, which is configured to be fastened, and lubricating oil leaking from the keyway connected to the lubricating oil circulation part is sealed with a liquid gasket applied between the soft metal ring and the fixing bolt. In the fitting part, a protruding part larger than the inner diameter of the soft metal ring is provided on the side closer to the rotating body than the soft metal ring, and a protruding part larger than the inner diameter of the soft metal ring is provided on the side opposite to the rotating body from the protruding part. A structure for attaching a rotating body to a rotating shaft, characterized by providing a smaller annular groove.