Starting fluted disc of four-stroke aero-engine

Abstract

A starting fluted disc of a four-stroke aero-engine comprises a gear ring and a fluted disc body. A crankshaft hole, a spigot, a timing identification hole, a plurality of positioning mounting holes and a riveting hole a are formed in the fluted disc, the crankshaft hole is located in the center of the fluted disc, the spigot and the crankshaft hole are coaxially arranged, the positioning mounting holes and the riveting hole a are evenly distributed in the circumferential direction of the crankshaft hole, and the timing identification hole corresponds to the positioning mounting holes and the riveting hole a in position; a plurality of riveting holes b corresponding to the riveting holes a are formed in the gear ring, and the riveting holes b correspond to teeth of the gear ring in position; and the gear ring is hot-pressed on the spigot of the fluted disc and is riveted with the fluted disc through a rivet. According to the starting fluted disc, the corresponding relation between the position of the timing identification hole and the crankshaft upper dead center can be guaranteed, and the accuracy of ignition timing can be improved. In addition, the starting fluted disc is convenient to replace and can drive the oil pump to operate, and the connecting structure of the crankshaft output shaft is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of aero-engine, especially to a starting gear disc of four-stroke aero-engine. BACKGROUND

[0002] The starting gear disc is a gear fixed on a crankshaft for driving the crankshaft to rotate and starting the aero-engine.

[0003] Referring to the drawings Figure 1 and the drawings Figure 2 Unlike conventional gears, the starting gear disc of the aero-engine is generally press-fitted on the output shaft of the crankshaft 4 in an interference fit, and a timing mark hole 13 is arranged on the starting gear disc, which corresponds to the top dead center of the crankshaft. At present, the existing starting gear disc at least has the following problems:

[0004] 1. The starting gear disc adopts an integral structure, and it is difficult to ensure the correspondence between the timing mark hole and the top dead center of the crankshaft during machining and press fitting;

[0005] 2. Since an interference fit is adopted, the starting gear disc is difficult to disassemble from the crankshaft for replacement;

[0006] 3. The crankshaft also drives the oil pump to operate, but the length of the output shaft of the crankshaft is limited, and it is inconvenient to install the belt pulley. INVENTION CONTENTS

[0007] In order to overcome the deficiencies in the background art, the utility model discloses a starting gear disc of four-stroke aero-engine, and the purpose is:

[0008] 1. Ensure the correspondence between the timing mark hole and the top dead center of the crankshaft;

[0009] 2. Make the starting gear disc easy to disassemble;

[0010] 3. Drive the oil pump to operate.

[0011] Specifically, the utility model adopts the following technical scheme:

[0012] A starting gear disc of four-stroke aero-engine, comprising a gear ring and a gear disc; a crankshaft hole, a stop, a timing mark hole, a plurality of positioning installation holes and riveting holes a are arranged on the gear disc, the crankshaft hole is located at the center of the gear disc, the stop is coaxially arranged with the crankshaft hole, the plurality of positioning installation holes and riveting holes a are uniformly arranged along the circumference of the crankshaft hole, and the timing mark hole has a positional correspondence relationship with the positioning installation hole and the riveting hole a; a plurality of riveting holes b corresponding to the riveting holes a are arranged on the gear ring, and the riveting holes b have a positional correspondence relationship with the gear teeth of the gear ring; the gear ring is hot-pressed on the stop of the gear disc and riveted with the gear disc through a rivet.

[0013] To further improve the technical solution, a protruding ring sleeve is provided at one end of the gear disc, the ring sleeve is coaxially arranged with the crankshaft hole, and a plurality of belt grooves are provided on the outer circumferential surface of the ring sleeve.

[0014] To further improve the technical solution, ten positioning mounting holes are provided on the gear disc, and the timing identification hole is located in the radial direction of one of the positioning mounting holes.

[0015] To further improve the technical solution, thirty-six rivet holes a are provided on the gear disc, and the angle between the timing identification hole and one of the rivet holes a in the radial direction is 5°.

[0016] To further improve the technical solution, there are two adjacent rivet holes b on the gear ring, which are symmetrically arranged about the center line of the teeth.

[0017] To further improve the technical solution, the number of teeth of the ring gear is 115 and the module is 2.1166.

[0018] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the present invention are:

[0019] 1. The riveted structure of the gear plate and the gear ring can ensure the correspondence between the timing mark hole and the top dead center of the crankshaft, which is beneficial to improving the accuracy of the ignition timing;

[0020] 2. The starting gear disc is easy to remove from the crankshaft and is convenient for replacement;

[0021] 3. The starting gear plate has a belt groove that can drive the oil pump to operate, which simplifies the connection structure of the crankshaft output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 Shown is a schematic structural diagram of an existing starting gear disc.

[0023] Attachment Figure 2 Shown is a schematic diagram of the press-fit structure of an existing starting gear disc on a crankshaft.

[0024] Attachment Figure 3 What is shown is the front view of this starting gear disc.

[0025] Attachment Figure 4 Shown is the attached Figure 3 Cross-section of AA.

[0026] Attachment Figure 5 Shown is a front view of the toothed disc.

[0027] Attachment Figure 6 Shown is a cross-section of a toothed disc.

[0028] Attachment Figure 7 Shown is the attached Figure 6 Schematic diagram of the structure at P in the figure.

[0029] attached Figure 8 A front view of the gear ring is shown.

[0030] attached Figure 9 A sectional view of the gear ring is shown.

[0031] attached Figure 10 A schematic view of the mounting structure of the starting gear disc on the crankshaft is shown.

[0032] In the drawings: 1, gear disc; 11, crankshaft hole; 12, stop opening; 13, timing mark hole; 14, positioning mounting hole; 15, riveting hole a; 16, belt groove; 2, gear ring; 21, riveting hole b; 22, gear tooth; 3, rivet; 4, crankshaft. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be described below with reference to the drawings. Those skilled in the art will understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. It should be noted that in the description of the present application, the terms "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. It should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] attached Figure 3 and attached Figure 4 A starting gear disc of a four-stroke aero-engine is shown, which comprises a gear ring 2 and a gear disc 1, the gear ring 2 and the gear disc 1 are riveted together by a rivet 3, and the structure and function thereof will be described below.

[0035] Referring to the drawings Figure 5 and attached Figure 6. A crankshaft hole 11 is provided at the center position of the sprocket 1, and a stop 12 is provided at the edge of the sprocket 1, and the stop 12 is coaxially arranged with the crankshaft hole 11. Ten positioning mounting holes 14 and thirty-six rivet holes a15 are evenly distributed on the disk surface of the sprocket 1 along the circumference of the crankshaft hole 11, wherein the thirty-six rivet holes a15 are located on the outside of the ten positioning mounting holes 14. A timing identification hole 13 is also provided on the disk surface of the sprocket 1, and the timing identification hole 13 is located in the radial direction of one of the positioning mounting holes 14, and the angle between the timing identification hole 13 and one of the rivet holes a15 in the radial direction is 5°. In this way, there is a definite positional correspondence between the timing identification hole 13 and the positioning mounting hole 14 and the rivet hole a15.

[0036] Refer to the attached Figure 7 A protruding ring sleeve is provided at the right end of the gear disc 1, which is coaxially arranged with the crankshaft hole 11, and four belt grooves 16 are provided on the outer circumferential surface of the ring sleeve.

[0037] Refer to the attached Figure 8 and attached Figure 9 The gear ring 2 has 115 teeth 22 with a module of 2.1166. Thirty-six rivet holes b21 are provided on the gear ring 2, corresponding to the rivet holes a15. Two adjacent rivet holes b21 are symmetrically arranged about the centerline of the teeth 22, and the angle between these two adjacent rivet holes b21 and the centerline is 5°. Thus, the rivet holes b21 and the teeth 22 on the gear ring 2 have a defined positional correspondence.

[0038] Refer again to the attached Figure 3 and attached Figure 4 Before riveting, heat ring gear 2 and apply 648 Loctite to stop 12 of sprocket disc 1. Then, heat ring gear 2 onto stop 12 of sprocket disc 1. Before hot pressing, use a tool such as a pin to align rivet hole a15 on sprocket disc 1 with rivet hole b21 on ring gear 2, ensuring that the timing mark hole 13 and tooth 22 have a clear positional correspondence. Finally, use rivet 3 to rivet ring gear 2 to sprocket disc 1.

[0039] Since there is a definite positional correspondence between the timing identification hole 13 and the positioning mounting hole 14 and the rivet hole a15, and the rivet hole b21 and the tooth 22 on the ring gear 2 also have a definite positional correspondence, the correspondence between the timing identification hole 13 and the top dead center of the crankshaft 4 can be ensured, thereby improving the accuracy of the ignition timing.

[0040] Refer to the attached Figure 10When installing, the crankshaft hole 11 is sleeved on the crankshaft 4, then the starting toothed disc is fixed on the end face of the crankshaft 4 by using screw insertion into the positioning installation hole 14, and the installation angle of the starting toothed disc on the crankshaft is ensured. Since the starting toothed disc has the belt groove 16, when the crankshaft 4 rotates, the starting toothed disc can drive the oil pump to rotate through the belt, and the connecting structure of the output shaft of the crankshaft is simplified.

[0041] The parts not described in detail are prior art. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A starting dog for a four-stroke aeroengine, characterised in that: It comprises a gear ring and a gear disc; a crank hole, a stop, a timing mark hole, a plurality of positioning installation holes and riveting holes a are arranged on the gear disc, the crank hole is located at the center of the gear disc, the stop is coaxially arranged with the crank hole, the plurality of positioning installation holes and riveting holes a are uniformly arranged along the circumferential direction of the crank hole, and the timing mark hole has a positional correspondence relationship with the positioning installation holes and the riveting holes a; a plurality of riveting holes b corresponding to the riveting holes a are arranged on the gear ring, and the riveting holes b have a positional correspondence relationship with the gear teeth of the gear ring; the gear ring is hot-pressed on the stop of the gear disc and riveted with the gear disc through rivets.

2. A starter ring for a four-stroke aeroengine as claimed in claim 1, characterised in that: A protruding ring sleeve is arranged at one end of the gear disc, the ring sleeve is coaxially arranged with the crank hole, and a plurality of belt grooves are arranged on the outer circular surface of the ring sleeve.

3. A starter ring for a four-stroke aircraft engine as in claim 1, characterized in that: Ten positioning installation holes are arranged on the gear disc, and the timing mark hole is located in the radial direction of one of the positioning installation holes.

4. A starting gear disc for a four-stroke aircraft engine according to claim 1 or 3, characterized in that: Thirty-six riveting holes a are arranged on the gear disc, and the included angle between the timing mark hole and one of the riveting holes a in the radial direction is 5°.

5. A starting gear disc for a four-stroke aircraft engine as claimed in claim 4, characterized in that: The two adjacent riveting holes b on the gear ring are symmetrically arranged about the center line of the gear teeth.

6. A starter ring for a four-stroke aircraft engine as in claim 1, characterized in that: The gear ring has 115 gear teeth, and the module is 2.1166.

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