JPS60228702A - Method of installing gas seal of rotary piston engine - Google Patents

Abstract

PURPOSE:To improve assembling workability of a corner seal and an apex seal, by bonding one end of a seal ring to the corner seal under the condition where a notch of the seal ring is in coincidence with a notch of the corner seal. CONSTITUTION:A seal ring 12 having an apex seal insertion notch 13a is engaged with a seal ring groove 11c of a corner seal 11 having the notch 13a. One end of the ring 12 is bonded to the seal 11 under the condition where a notch 12a of the ring 12 is in coincidence with a notch 11a of the seal 11. Then, the seal 11 is installed into a recess 21 of a rotor 20, and if required, the seal 11 is rotated to bring the notch 11a into coincidence with an apex seal groove 23 in the periphery of the rotor 20. As a result, the notch 12a of the ring 12 is also brought into coincidence with the groove 23. Thereafter, an end portion of an apex seal 15 is inserted into the notches of the seal 11 and the ring 12, and is engaged with the apex seal groove 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling gas seals such as corner seals and apex seals attached to a rotor in a rotary piston engine.

(Prior art) By planetarily rotating a substantially triangular rotor within a casing having a cocoon-shaped inner circumferential surface, a plurality of working chambers defined by the respective apex portions of the rotor perform intake and compression. In a rotary piston engine that performs the , explosion, and exhaust strokes, a structure as shown in, for example, Japanese Utility Model Application Publication No. 56-49201 is used as a gas seal structure between the working chambers. As shown in FIG.
□A cylindrical recess 3 overlapping the end of the apex seal groove 2 is formed on the top side surface of the rotor 1, and an apex seal spring 4 and an apex seal 5 are installed in the apex seal groove 2. Put it on,
Further, an auxiliary piece 6 (usually a corner seal spring in the form of a spring washer) and a corner seal 7 are installed in the recess 3. In that case, the corner seal 7 and the auxiliary piece 6 (or the corner seal spring) are provided with cutouts 7a and 5a into which the end of the apex seal 5 is inserted. Although not shown in FIG. 6 and the above publication, a side seal groove is formed along the side B of the rotor 1 between the adjacent recesses 3 and 3 on the side surface of the rotor 1, and a side seal groove is formed in the groove along the side B of the rotor 1. A seal spring and side seal are installed.

By the way, in the gas seal structure as described above, a seal ring groove 7b is formed on the outer peripheral surface of the corner seal 7 as shown by the chain line in FIG. Attach the recess 3 of the rotor 1
It is conceivable that the sealing performance at the corner seal portion can be further improved by mounting the ring 8 inside the ring 8 and pressing its outer circumferential surface 8a against the inner circumferential surface 3a of the recess 3 by the outward expansion force of the ring 8. In that case, the seal ring 8
Similar to the notch 7a in the corner seal 7, a notch 8b is provided in which the end of the apex seal 5 is inserted.

However, when the seal ring 8 is attached to the corner seal 7 as described above, the following problems sometimes occur when assembling the corner seal 7 and the apex seal 5 to the rotor 1.

That is, when the seal ring 8 is installed in the seal ring groove 7b of the corner seal 7, the ring 8 can freely rotate within the groove 7b, so that the end portion of the ring 8 can be rotated freely within the groove 7b as shown in FIG. 8c protrudes into the notch 7a of the corner seal 7, or the ring 8 completely closes the notch 7a of the corner seal 7. tend to be in a state where they do not match. Therefore, when the corner seal 7 is installed in the recess 3 of the rotor in this state, it is relatively easy to align the notch 7a of the corner seal 7 with the apex seal groove 2 of the rotor 1;
Furthermore, it is extremely difficult to align the notches 8b of the seal ring 8 with these, and when installing the apex seal 3, these notches 7a and 8b are aligned with the apex seal groove 2.
This would require a tedious task to match.

In addition, when the corner seal 7 with the seal ring 8 attached thereto is attached to the recess of the rotor 1, it has protrusions that engage with the ring 8 and the cutouts 8b, 7a of the seal 7, and both cutout portions 8b, A jig may be used to guide the grooves 7a into the recess 3 of the rotor 1 in a state where they are aligned, but even when such a jig is used, the notch 7a of the corner seal 7 and the notch 8b of the seal ring 8 are If they do not match, installation to the jig will be troublesome, and both cut portions 7a will be difficult to install.

Even if the seal ring 8 is guided to the four parts 3 with the jig aligned, the seal ring 8 will move when the jig is removed and the tip will enter the notch 7a of the corner seal 7 or the apex seal groove 2 of the rotor 1, causing the above-mentioned This causes problems.

(Object of the Invention) The present invention addresses the above-mentioned problems when attaching a gas seal to the rotor of a rotary piston engine. When installing a seal ring with a notch for inserting a seal and assembling it into the recess of the rotor, the corner seal and the notch of the seal ring will be attached to the jig and when assembled into the recess. The object of the present invention is to improve the workability or work efficiency of the work of assembling the corner seal and apex seal to the rotor by keeping the corner seals and apex seals in the same state.

(Structure of the Invention) A method for assembling a gas seal for a rotary piston engine according to the present invention is characterized in that it is configured as follows in order to achieve the above object.

That is, first, a seal ring also having an apex seal insertion notch is attached to a seal ring groove provided on the circumferential surface of a corner seal having an apex seal insertion notch, and the notch of the seal ring is inserted into a corner. Glue one end of the ring to the corner seal, aligned with the notch in the seal. Then, in this state, the corner seal is assembled into the recess formed on the side surface of the top side of the rotor, and if necessary, the corner seal is rotated within the recess so that the notch of the seal is attached to the top side of the rotor. to match the apex seal groove provided along the

At this time, since one end of the seal ring is bonded to the corner seal, if the notch of the corner seal matches the apex seal groove, the notch of the seal ring also matches the apex seal groove. After that, the end of the apex seal is inserted into the notch of the corner seal and seal ring, and the apex seal is installed in the apex seal groove.

(Effects of the Invention) As described above, the present invention provides a seal ring having a notch for inserting an apex seal on the outer peripheral surface of a corner seal having a notch for inserting an apex seal. Since one end of the seal ring is glued to the corner seal in advance when assembling into the recess in When installing the apex seal after it has been assembled into a gas seal, the trouble of aligning the notch of the seal ring with the notch of the corner seal or the apex seal groove is eliminated, which improves the workability of this type of gas seal assembly work. Efficiency will be improved.

(Example) Hereinafter, an example of the gas seal assembly method according to the present invention will be described.

First, as shown in FIG. 1, a hollow cylindrical corner seal 11 and a seal ring 12 are prepared.

An apex seal insertion notch 11a having a predetermined width is formed on one side of the corner seal 11 over the entire axial length, and a circumferential seal ring groove 11c is formed on the outer peripheral surface 11b. Further, the seal ring 12 is made of a resilient metal material or the like, and the ring 12 is also formed with an apex seal insertion notch 12a having a predetermined width. Here, the ring 1
2 has an outer diameter larger than the outer diameter of the corner seal 11 in its natural state, and the width of the notch 12a is also slightly wider than the width of the notch 11a in the corner seal 11. Then, the small seal ring 12 is attached to the seal ring groove 11G of the corner seal 11 while expanding both ends 12b and 12c as shown by arrows a and a against its own elasticity.

Next, as shown in FIG. 2, with the seal ring 12 installed in the seal ring groove 11c of the corner seal 11,
The notch 12a of the ring 12 and the notch 11a of the corner seal 11 are aligned, and both ends 12b of the ring 12,
12c is the end surface 11 on both sides of the corner seal notch 11a.
d, 11e', and in this state, one end 12b of the seal ring 12 is bonded to the corner seal 11 as shown by the arrow.

Then, as shown in FIG. 3.4, this corner seal 11 is attached to the four cylindrical parts 21 formed on the side surface of the top side of the rotor 20, and in this case, a jig 30 is used. This jig 30 has an upper end opening 31 a larger than the outer diameter of the seal ring 12 in its natural state, and a lower end opening 31 b that is equal to or slightly larger than the outer diameter of the corner seal 11 and equal to the inner diameter of the recess 21 . A slightly smaller tapered cylindrical body 31, a base plate 32 provided at the lower end of the cylindrical body 31, and a guide protrusion 33 protruding from a predetermined position on the inner surface of the cylindrical body 31 along the generatrix of the cylindrical body 31. It is made up of.

A rotor 2 is provided on the bottom surface 32a of the base plate 32.
A positioning protrusion 32b that is engaged with the side seal grooves 22, 22 on the side surface of the
2b, the jig 30 is attached to the rotor 2.
When set on the side surface of 0, the bottom # of the cylindrical body 31
ii The opening 31b faces the recess 21 in the rotor 20, and the protrusion 33 matches the apex seal groove 23 in the rotor 20. In addition, this protrusion 33
The lower end portion 33a protrudes downward from the lower end opening 31b of the cylindrical body 31 or the bottom surface 32a of the base plate 32, and when the jig 30 is set on the side surface of the rotor 20 as described above, the lower end portion 33a is adapted to protrude into the recess 21.

Then, with the jig 30 set on the side surface of the rotor 20, first open the upper end opening 31a of the cylindrical body 31 of the jig 30.
A corner seal spring 13 shaped like a spring washer is dropped from the spring. This spring 13 is also provided with a notch 13a for inserting an apex seal, and the notch 13a falls while being engaged with a protrusion 33 provided on the inner surface of the cylindrical body 31 to form a recess 20 in the rotor 20. However, the spring 13 may be loaded into the recess 21 before the jig 30 is set on the rotor 20.

Next, the upper end opening 31 of the cylindrical body 3'1 in the jig 30
The corner seal 11 with the seal ring 12 attached thereto as described above is fitted into the corner seal 11. At this time, the notch 11a of the corner seal 11 and the seal ring 12
Since the notches 12a and the notches 12a of
a, 12a can be easily engaged with the protrusion 33 on the inner surface of the cylindrical body 31. Then, in this state, use the pushing jig 34 as shown in Figure W3 to press the corner seal 11.
is pushed downward into the cylindrical body 31 of the jig 30. At this time,
Since the cylindrical body 31 has a tapered shape with a downward depression,
The seal ring 12 installed in the seal ring groove 110 of the corner seal 11 is reduced in diameter by the inner surface of the cylindrical body 31, and is installed in the corner seal 11 within a recess 21 having a smaller diameter than the outer diameter of the ring 12 in its natural state. It will be introduced smoothly in a state where the In addition, the above protrusion 3
3, since the lower end 33a is inserted into the recess 21,
Even after the corner seal 11 is completely installed in the recess 21, the notch 11a of the seal 11 and seal ring 12 remains intact.
, 12a are held in a predetermined direction, that is, in a direction that coincides with the apex seal groove 23 in the rotor 20.

Once the corner seal 11 is installed in the recess 21 of the rotor 20, the jig 30 is removed from the rotor 20. At this time, the corner seal 11 may rotate within the recess 21. However, even in such a case, since one end 12b of the seal ring 12 is bonded to the corner seal 11, the positions of the notches 12a and 11a of the ring 12 and the corner seal 11 are shifted, and the ring 12 is The end portion 12b or 120 is the corner seal 11
It does not enter the notch 11a or block the notch 11a. Therefore, if the notch 11a of the corner seal 11 and the apex seal groove 23 of the rotor 20 are aligned as necessary, the notch 12a of the seal ring 12 will automatically become the apex seal 112°3 as shown in FIG. will be matched.

As a result, when the apex seal spring 14 and the apex seal 15 are installed in the apex seal groove 23 of the o-tater 20, the end of the apex seal 15 is connected to the notch 11 of the corner seal 11 and the seal ring 12.
a, can be easily inserted into 12a,
Workability or work efficiency during the assembling work of the apex seal 15 is improved. - Here, in the present invention, the reason why only one end 12b of the seal ring 12 is bonded to the corner seal 11 is as follows. That is, if both ends of the seal ring were to be glued to the corner seal, the diameter of the ring would have to be reduced so that it could be inserted into the recess. Even afterward, the diameter of the ring will be reduced and the sealing performance due to the expansion force of the ring will not be obtained, and since both ends are bonded, a large stress will be generated during thermal expansion. To deal with this, it is possible to fix both ends of the seal ring using an adhesive whose adhesive strength disappears due to the heat generated when the engine is running, but such adhesives have weak adhesive strength from the beginning. It is difficult to fix both ends of the seal ring in a state where its diameter is reduced against its own elasticity. In addition, in the structure in which only one end of the seal ring is bonded to the corner seal as in the present invention, it is possible to use an adhesive force that disappears due to heat as described above.

[Brief Description of the Drawings] Figures 1 to 5 show an embodiment of the assembly method of the present invention, and Figure 1 is a perspective view showing a corner seal and a seal ring;
Figures 2(a) and (b) are a plan view and a front view showing a state in which a seal ring is attached to a corner seal and one end of the ring is adhered to the corner seal, and Figure 3.4 shows a corner seal attached to a rotor. FIG. 5 is an exploded perspective view and a vertical cross-sectional view showing the corner seal installed in the recess of the rotor, and FIG. 5 is a front view of main parts showing the corner seal installed in the recess of the rotor. Also, the 6th
The figure is an exploded perspective view showing a conventional gas seal structure, and FIG. 7 is a front view of main parts showing problems when a seal ring is attached to a conventional corner seal. 11... Corner seal, 11a... Notch, 1゛1b... Outer peripheral surface, 11c... Seal ring groove, 12
...Seal ring, 12a...Notch, 12b...
- End, 15... Apex seal, 20... Rotor, 21... Concave portion, 23... Apex seal groove. Figure 1 Figure 2 Figure 1 Figure 4 @ Figure 5 = Nido 14

Claims (1)

[Claims] (1) A seal ring also having a notch for inserting the apex seal is attached to the seal ring groove of the corner seal having a notch for inserting the apex seal and a seal ring groove formed on the outer peripheral surface, With the notch of the ring and the notch of the corner seal aligned, one end of the ring is glued to the corner seal, and in this state the corner seal is attached to a cylinder provided on the side of the top of the rotor. Then, the apex seal is assembled into the apex seal groove provided along the top of the rotor by inserting its end into the notch of the corner seal and seal ring. A method for assembling a gas seal for a rotary piston engine, characterized by: