JPS6038534B2 - Rotary piston engine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a structure of a rotor of a rotary piton engine,
In particular, it relates to improvements in the rib structure that integrally connects the rotor flank and rotor boss.

Conventionally, as shown in FIG. 1, the support structure of the rotor 4 in which the rotor flank 1 and the rotor boss 2 are integrally connected by a plurality of radial ribs 3, . It is widely used as (see Japanese Utility Model Publication No. 46-8243).

By the way, since the rotor is exposed to harsh thermal conditions,
Large thermal stresses occur in each wall of the rotor. When this thermal stress is determined by a structural analysis method, the results are shown in FIG.
, IL, a large compressive stress acts on them, while an excessive tensile stress acts on a pair of top ribs 3a, 3b which respectively define a top hollow chamber 5 between them, and these Due to the interaction of stresses, as shown by the virtual bran A in the figure,
The vicinity of the avex seal groove 6 protrudes in the vertical direction, the avex seal groove 6 opens, and the sealing function of the avex seal (not shown) installed in the groove 6 is significantly impaired. There was a problem in that cracks were generated at the joints between the rotor flank ends IT, IL and the top ribs 3a, 3b. For this reason, conventionally,
Although the thickness of the top ribs 3a and 3b was increased to ensure the supporting strength (rigidity) of the rotor top 4a, there was a problem in that it was not possible to reduce the weight of the rotor.

Kangosanmei was developed to solve the above drawbacks of the rotor structure, and is a rotary pit engine that has a rib structure that can effectively share or absorb the excessive compressive stress generated on the rotor flank. The purpose is to provide rotors for

Therefore, in the rotor lip structure according to the present invention, a pair of ribs are provided on each rotor flank such that an extension line connecting the lid tendon points of the lip intersects the center line of symmetry of the rotor flank on the outside of the rotor flank. Its basic feature is that it was formed against the

The present invention will be described in detail below with reference to the illustrated embodiments.

As shown in Figure 2, the rotor flank 1 and rotor boss 2
Among the ribs coupled and supported, a pair of ribs 10 and 11 located in the combustion recess lb formed in the rotor flank 1 have base points 10a and 11a on the rotor boss 2 side and base points 10b and 11b on the rotor flank 1 side, respectively. The extension lines 1, 12 of the base lines connecting the rotor flanks 1, 12 are inclined so that they meet on the symmetry center line L of the rotor flank 1 and at a point P on the outside of the rotor flank 1. A pair of ribs 12 and 13 located on the back of the top 4a of the
, 13 on the rotor flange 1 side are provided with chord-shaped ribs 14 that connect base points 12b and 13b of the rotor flange 1 to each other.

Considering the pair of ribs 1414 provided on each top portion 4a, 4b of the rotor 4, each rib 14 has a chordal shape.
The extension lines 13 and 14 of No. 4 in the ball direction are arranged to meet on the symmetry center line L of the rotor flank 1 and at a point P2 outside the rotor flank 1, as described above.

On the other hand, a pair of ribs 12, 13 located on the back of each rotor top 4a, 4b, 4c are arranged at base points 12b, 13b on the rotor flank side and base point 1 on the rotor boss 2 side, as in the conventional machine.
Extension lines 15 and 16 of the base line connecting 2a and 13a, respectively, are
These ribs 12 and 13 are formed so as to meet on the symmetry center line L of the rotor flank 1 at a point P3 on the inner fluff side of the rotor boss 2, and the compressive stress acting on the rotor flank 1 is received by the tensile stress. That's what I do.

As shown in FIG. 3, the chord-shaped ribs 14 are arranged between a pair of ribs 14a and 14b that protrude a certain width from the inner wall surfaces of the side walls 4s and 4t of the rotor 4 in a direction approaching each other. A gap is provided so that the circulation of cooling oil within the hollow chamber 15 is not obstructed.

FIG. 4 shows the results obtained by structural analysis of the thermal stress distribution when the rib structure as described above is adopted.

As is clear from a comparative comparison of FIG. 4 and FIG. 1, the rotor flank machine parts IT, IL forming the rotor neck part 4a
The compressive stress becomes smaller as a whole, and the reduction is shared by the chordal ribs 14. As a result, the compressive stress at the joints between the top ribs 12, 13 and the rotor flanks IT, IL and the ribs 12, 13 are reduced. It can be seen that the applied tensile stress is significantly reduced.

As described above, if a rib structure is adopted in which each rotor flank is provided with at least one pair of ribs such that the base line of the rib extends on the rotor flank symmetry center line and meets on the outside of the rotor flank, The base line direction of the rib is
Since it is at an acute angle to the tangent to rotor flank 1,
Since the excessive compressive stress acting on the rotor flank 1 can be shared, thermal distortion of the rotor flank 1 can be suppressed to a minimum, and a stable structure can be achieved as a whole.

In addition, in the above embodiment, for each rotor flank 1,
A total of two pairs of ribs (1 0, 11), (1
4, 14), but a pair of ribs (for example,
It goes without saying that ribs 14, 14) may also be used.

As is clear from the above, the present invention includes, for each rotor flank, a lip structure having at least one pair of ribs whose extension line of the base line meets on the rotor flank symmetry center line and on the outside of the rotor flank. The present invention provides a rotor for a rotary pit engine.

According to the present invention, the excessive thermal stress generated in the rotor flank can be shared or absorbed by the at least one pair of ribs, and thermal deformation of the rotor top can be prevented, so that the apex sealing performance is not impaired. In addition, it is possible to prevent cracks from occurring at the rib joints, and overall, it is possible to reduce the excessive thermal stress generated in each part of the rotor and equalize the stress distribution.
The supporting rigidity of the rotor flank, ribs, etc. can be set to a small value, and the weight of the rotor can be reduced.

[Brief explanation of drawings]

Fig. 1 is an explanatory view of the warm surface of the top of the rotor showing the thermal stress distribution in the rib structure of a conventional rotor, Fig. 2 is a vertical sectional view of a rotor according to an embodiment of the present invention, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a cross-sectional explanatory view similar to FIG. 1 showing the thermal stress distribution at the top of the rotor according to the embodiment of the present invention. 1... Rotor flank, 2... Rotor boss, 10, 11, 1
2, 13, 14... ribs. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a rotor for a rotary piton engine in which a large number of ribs are arranged between a rotor flank and a rotor boss to form a large number of hollow chambers, at least one pair of ribs located on the back surface of each rotor flank is A rotor for a rotary piton engine, characterized in that an extension line connecting the base points of the rotor flank intersects radially outward from the rotor flank.