CN109139326B - Starter embedded output shaft assembly - Google Patents
Starter embedded output shaft assembly Download PDFInfo
- Publication number
- CN109139326B CN109139326B CN201710498470.9A CN201710498470A CN109139326B CN 109139326 B CN109139326 B CN 109139326B CN 201710498470 A CN201710498470 A CN 201710498470A CN 109139326 B CN109139326 B CN 109139326B
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- CN
- China
- Prior art keywords
- shaft
- output
- thin safety
- starter
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007858 starting material Substances 0.000 title claims abstract description 49
- 238000010008 shearing Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 32
- 230000013011 mating Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
- F02N15/10—Safety devices not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
- F16C3/023—Shafts; Axles made of several parts, e.g. by welding
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to a starter embedded output shaft assembly, which comprises an output long shaft, an output short shaft and a thin safety shaft, wherein the shaft center of the output long shaft and the shaft center of the output short shaft are axially provided with shaft holes, the thin safety shaft is arranged in the shaft holes of the output short shaft and the output long shaft, the front end of the thin safety shaft is provided with a limit pin hole, and the front end of the shaft hole in the output long shaft is axially provided with a chute, so that when the thin safety shaft is inserted into the shaft hole, a first limit pin is inserted into the limit pin hole at the front end of the thin safety shaft and is arranged in the axial chute at the front end of the output long shaft, and the thin safety shaft and the output long shaft are in circumferential limit connection through the first limit pin; the middle part of the shaft hole of the output long shaft is also provided with a thrust step hole, the front end of the thin safety shaft is sleeved with a spring in a compressed state, the spring is arranged between the thrust step hole and the first limiting pin, and the inner side of the front end of the thin safety shaft is provided with a thin safety shaft shearing section.
Description
Technical Field
The invention relates to the technical field of aviation starters, in particular to a starter embedded output shaft assembly.
Background
In an aviation system, a starter is used as a key product of an engine starting system and is widely used in civil and military aircraft, the performance of the starter directly determines whether an engine is successfully started, and an output shaft is a torque transmission link connecting the engine and the starter and is an important component of the starter. The traditional output shaft is designed as an integral, the design structure of the output shaft is simple, and the shearing shaft is designed for torsion-breaking protection mainly by considering the safe operation of an engine, but the safety operation requirement of a starter cannot be considered at the same time. If overload or mechanical failure of the starter occurs, the integral output shaft cannot be twisted off in time to protect the starter, so that further damage to the starter is caused, serious consequences are caused, and great economic loss is caused. There are also a small number of output shafts which are designed in a split type, for example, CN205330860U of Chinese issued patent publication discloses an output shaft assembly of an air turbine starter, which comprises an output shaft and an adapter shaft, wherein the output shaft assembly further comprises a fastening screw and a fastening nut, the outer diameter of the middle part of the output shaft is provided with a hollow pit to form a weak section for overload protection, one end of the output shaft is connected with an engine, and the other end of the output shaft is fixedly connected with the adapter shaft through the fastening screw and the fastening nut; the end face of one end of the output shaft, which is connected with the transfer shaft, is provided with a plurality of grooves, and the end face of one end of the transfer shaft, which is connected with the output shaft, is provided with a plurality of protrusions matched with the grooves, so that the functions of forward torque transmission and reverse disengagement are realized. The starter output shaft assembly is connected with the output shaft and the switching shaft through the fastening screw rod, so that the starter can be protected, but the fastening screw rod is fastened and connected with the switching shaft through the fastening nut, the switching shaft and the output shaft are always in a high-speed rotation and vibration state in a working state, the nut is easy to loosen, the condition that the fastening screw rod and the fastening nut are separated from each other occurs, the stability and the reliability of the work are seriously influenced, the output long shaft and the output short shaft are connected by the nut, the safety embedding self-adaptive adjusting capability is not provided, and if the nut is in a safety working state, the nut loosens due to vibration, and the tightness of normal embedding of the output long shaft and the output short shaft is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a starter embedded output shaft assembly which is stable and reliable in structure and can be subjected to torsion-breaking protection.
In order to solve the technical problems, the starter embedded output shaft assembly comprises an output long shaft, an output short shaft and a thin safety shaft, wherein the tail end of the output short shaft is in transmission fit with a starter, a plurality of transmission ladder teeth are arranged on the end face of the front end of the output short shaft in an axially protruding mode, a right-angle starting face is arranged on one side of each transmission ladder tooth along the circumferential direction, a slope separating face is arranged on the other side of each transmission ladder tooth, a plurality of transmission grooves matched with the transmission ladder teeth in shape are arranged on the tail end of the output long shaft, the front end of the output long shaft is in transmission fit with an engine, the axes of the output long shaft and the output short shaft are provided with shaft holes along the axial direction, the thin safety shaft is arranged in the shaft holes of the output short shaft and the output long shaft, a limiting pin hole for installing a first limiting pin is arranged at the front end of the shaft hole in the output long shaft in the axial direction, and when the thin safety shaft is inserted into the shaft hole, the first limiting pin inserted into the sliding groove at the front end of the output long shaft, and the thin safety shaft and the output long shaft are in the circumferential limiting connection through the first limiting pin; the middle part of the shaft hole of the output long shaft is provided with a thrust step hole, the thin safety shaft is provided with a spring with a pressing force, the spring is arranged between the thrust step hole and the first limiting pin, and the front end of the thin safety shaft is provided with a thin safety shaft shearing section; the tail end of the thin safety shaft and the tail end of the output short shaft are respectively provided with pin shaft insertion holes in a penetrating manner along the radial direction, when the tail end of the thin safety shaft is placed in a shaft hole of the tail end of the output short shaft, a second limiting pin is inserted along the pin shaft insertion holes to connect the thin safety shaft with the output short shaft, and finally, the thin safety shaft with a compression spring is used for jogging and connecting the output long shaft with the output short shaft; when in a starting state, the starter drives the output short shaft to rotate, and the output short shaft is in transmission fit with the output long shaft through the right-angle starting surface of the transmission ladder tooth, so that an engine connected with the output long shaft is started; after the engine normally runs, the engine speed is higher than the starter speed, and at the moment, the separation surface is axially pressed and embedded by the thin safety shaft with the pressing spring through matching the slope separation surface on the output long shaft with the slope separation surface on the output short shaft, so that the high-speed running of the output shaft of the starter is ensured under the normal working state of the engine; when the short-time output torque is increased but is smaller than the maximum torque value of the safe operation of the starter during the normal operation of the engine, the jogged separating surface can be self-adaptively adjusted by the elasticity of the compression spring under the condition that the shearing section of the thin safety shaft is elastically deformed, so that stable jogged is kept; if the faults such as the over rotation of the engine speed or the blocking of the starter component and the like suddenly appear when the engine runs, after the engine torque suddenly increases to a maximum torque value exceeding the safe work of the starter, the shearing section of the thin safety shaft can be timely accelerated to break under the action of torsional force and axial force, the embedded separation surface of the output long shaft and the output short shaft is rapidly separated, the secondary damage to the starter is effectively avoided, and the safety of the starter is timely protected.
Further, an output long shaft shearing section is arranged in the middle of the output long shaft, so that when the output torque of the starter increases to exceed the safe starting torque value of the engine in the starting state, the shearing section of the output long shaft breaks, and the starting overload safety protection is carried out on the engine.
The invention has the technical effects that: (1) Compared with the prior art, the starter embedded output shaft assembly has the advantages that the limiting pin and the compressed spring are arranged on the thin safety shaft, the assembly is simple and reliable, the embedded stability of the output long shaft and the output short shaft is kept under the normal working condition, the safety and the reliability are high, the thin safety shaft is rapidly separated after the thin safety shaft is twisted off in the emergency, the starter is effectively protected, and the disastrous accident is avoided; (2) When fault maintenance occurs, only the thin safety shaft with low cost needs to be replaced, so that the maintenance cost can be effectively reduced; (3) The middle section of the output long shaft is provided with an output long shaft shearing section, so that overload of the starter in the starting stage is avoided, the starter is damaged, and the starter is protected.
Drawings
The invention is described in further detail below with reference to the drawings of the specification:
FIG. 1 is a schematic view of a starter mating output shaft assembly of the present invention;
FIG. 2 is a schematic cross-sectional view of the italic tooth of the starter mating output shaft assembly of the present invention;
Fig. 3 is a schematic cross-sectional view of the starter fitting type output shaft assembly of the present invention in the axial direction.
In the figure: the engine is characterized by comprising an output long shaft 1, an engine connecting gear 11, an output long shaft shearing section 12, an output short shaft 2, a starter connecting gear 21, a transmission ladder tooth 22, a right-angle starting surface 23, a slope separating surface 24, a thin safety shaft 3, a thin safety shaft shearing section 31, a spring 4, a first spacer sleeve 5, a second spacer sleeve 6, a chute 7, a first limiting pin 8 and a second limiting pin 9.
Detailed Description
Embodiment 1 as shown in fig. 1 to 3, the starter embedded output shaft assembly of the present embodiment includes an output long shaft 1, an output short shaft 2 and a fine safety shaft 3, wherein the tail end of the output short shaft 2 is in transmission fit with a starter (not shown in the figure) through a starter connecting gear 21, according to the rotation direction of the starter and the engine, 3 transmission steps 22 are axially protruded on the end surface of the front end of the output short shaft 2, each transmission step 22 is uniformly distributed on the end surface of the front end of the output short shaft 2, one side of each transmission step 22 in the circumferential direction is provided with a right angle starting surface 23, the other side is provided with a slope separating surface 24, the tail end of the output long shaft 1 is provided with 3 transmission grooves matched with the transmission steps 22 in shape, the front end of the output long shaft 1 is in transmission fit with the engine (not shown in the figure) through an engine connecting spline 11, the axle center of the output long shaft 1 and the axle center of the output short shaft 2 are axially arranged in an axle hole, the fine safety shaft 3 is arranged in the axle hole of the output short shaft 1, a limit pin 8 is arranged in the limit pin hole of the front end of the fine safety shaft 3, the front end of the fine safety shaft 3 is axially arranged in the limit pin 8, the front end of the limit pin 7 in the output long shaft 1 is axially arranged in the limit pin 7 of the front of the limit pin 8, and the limit pin is connected with the front end of the limit pin 8 of the fine safety shaft 3 in the front of the limit pin 8 through the limit pin 8; the middle part of the shaft hole of the output long shaft 1 is also provided with a thrust step hole 13, the front end of the thin safety shaft 3 is sleeved with a spring 4, a first spacing sleeve 5 and a second spacing sleeve 6 which are in a compressed state, the tail end of the first spacing sleeve 5 is contacted with the thrust step 13, the tail end of the spring 4 is contacted with the front end of the first spacing sleeve 5, the front end of the spring 4 is contacted with the tail end of the second spacing sleeve 5, the front end of the second spacing sleeve 6 is contacted with a first limiting pin 8, so that the spring 4 is arranged between the thrust step hole 13 and the first limiting pin 8 through the first spacing sleeve 5 and the second spacing sleeve 6, and a thin safety shaft shearing section 31 is arranged at the inner side of the front end of the thin safety shaft 3; the tail end of the thin safety shaft 3 and the tail end of the output short shaft 2 are respectively provided with pin shaft jacks in a penetrating manner along the radial direction, and when the tail end of the thin safety shaft 3 is placed in a shaft hole at the tail end of the output short shaft 2, a second limiting pin 9 is inserted along the pin shaft jacks to connect the thin safety shaft 3 and the output short shaft 2 so as to enable the output long shaft to be in embedded connection with the output short shaft 2; an output long shaft shearing section 12 is arranged in the middle section of the output long shaft 1; when the engine is in use, the transmission ladder teeth 22 of the output short shaft 2 are embedded with the transmission grooves of the output long shaft 1, and in a starting state, the starter drives the output short shaft 2 to rotate, the output short shaft 2 drives the engine to start through the right-angle starting surface 23 of the transmission ladder teeth 22, and after the output torque is increased to exceed the safe working torque value of the engine in the starting state, the output long shaft shearing section 12 is twisted off to start overload protection for the engine; after the engine runs normally, the output long shaft 1 is in transmission fit with the output short shaft 2 through the slope separating surface 24 of the transmission ladder tooth 22, the thin safety shaft 3 and the transmission groove to drive the starter to rotate synchronously; when the engine runs, faults such as over rotation of the engine speed or clamping of a starter component and the like suddenly appear, so that the engine torque suddenly increases to a maximum torque value exceeding the safe work of the starter, the thin safety shaft shearing section 31 is twisted off, the jogged separating surface of the output long shaft 1 and the output short shaft 2 is rapidly separated, secondary damage to the starter is avoided, and the safety of the starter is protected.
It is apparent that the above examples are merely illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious changes and modifications which come within the spirit of the invention are desired to be protected.
Claims (2)
1. A starter-engaging output shaft assembly, comprising: the tail end of the output short shaft is connected with the starter transmission mechanism, a plurality of transmission ladder teeth are arranged on the end face of the front end of the output short shaft in an axially protruding mode, a right-angle starting face is arranged on one side of each transmission ladder tooth in the circumferential direction, a slope separating face is arranged on the other side of each transmission ladder tooth, a plurality of transmission grooves matched with the transmission ladder teeth in shape are arranged on the tail end of the output long shaft, the front end of the output long shaft is matched with the engine in a transmission mode through an engine connecting spline, the axle center of the output long shaft and the axle center of the output short shaft are axially provided with axle holes, the thin safety shaft is arranged in the axle holes of the output short shaft and the output long shaft, a limit pin hole is formed in the front end of the axle hole in the output long shaft in the axial direction, when the thin safety shaft is inserted into the axle hole, a first limit pin inserted into the limit pin at the front end of the thin safety shaft is arranged in the axial chute of the front end of the output long shaft, and circumferential limit connection is carried out between the thin safety shaft and the output long shaft through the first limit pin; the middle part of the shaft hole of the output long shaft is also provided with a thrust step hole, the front end of the thin safety shaft is sleeved with a spring in a compressed state, the spring is arranged between the thrust step hole and the first limiting pin, and the inner side of the front end of the thin safety shaft is provided with a thin safety shaft shearing section; the tail end of the thin safety shaft and the tail end of the output short shaft respectively penetrate through pin holes in the radial direction, and when the tail end of the thin safety shaft is placed in the shaft hole of the tail end of the output short shaft, a second limiting pin is inserted into the pin holes to connect the thin safety shaft and the output short shaft.
2. The starter mating output shaft assembly of claim 1, wherein a middle section of the output shaft is provided with an output shaft cutting section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710498470.9A CN109139326B (en) | 2017-06-27 | 2017-06-27 | Starter embedded output shaft assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710498470.9A CN109139326B (en) | 2017-06-27 | 2017-06-27 | Starter embedded output shaft assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109139326A CN109139326A (en) | 2019-01-04 |
| CN109139326B true CN109139326B (en) | 2024-04-26 |
Family
ID=64804813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710498470.9A Active CN109139326B (en) | 2017-06-27 | 2017-06-27 | Starter embedded output shaft assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109139326B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682239A (en) * | 2020-12-24 | 2021-04-20 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Anti-reverse belt emergency release mechanism |
| CN114024408B (en) * | 2021-11-24 | 2023-09-05 | 贵州航天林泉电机有限公司 | Double-cooling double-salient-pole generator |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777836A (en) * | 1986-09-15 | 1988-10-18 | Facet Enterprises, Inc. | Engine starter gearing |
| CN2470558Y (en) * | 2000-12-23 | 2002-01-09 | 李长兴 | Mechanical starting device of diesel engine |
| CN103527674A (en) * | 2012-07-03 | 2014-01-22 | 洪涛 | Spatial conjunction type centrifugal clutch capable of being operated rapidly, double-clutch automatic gearbox provided with spatial conjunction type centrifugal clutches, and control method |
| CN204024893U (en) * | 2014-09-02 | 2014-12-17 | 毅联实业(上海)有限公司 | The one-way element assembly of automobile-used gas starter motor |
| CN105402070A (en) * | 2015-12-14 | 2016-03-16 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Engagement and disengagement transmission device for air turbine starter |
| CN205330860U (en) * | 2015-12-14 | 2016-06-22 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Air turbine starter output shaft assembly |
| CN206889150U (en) * | 2017-06-27 | 2018-01-16 | 中国航发常州兰翔机械有限责任公司 | A kind of starter inserted type output shaft assembly |
-
2017
- 2017-06-27 CN CN201710498470.9A patent/CN109139326B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777836A (en) * | 1986-09-15 | 1988-10-18 | Facet Enterprises, Inc. | Engine starter gearing |
| CN2470558Y (en) * | 2000-12-23 | 2002-01-09 | 李长兴 | Mechanical starting device of diesel engine |
| CN103527674A (en) * | 2012-07-03 | 2014-01-22 | 洪涛 | Spatial conjunction type centrifugal clutch capable of being operated rapidly, double-clutch automatic gearbox provided with spatial conjunction type centrifugal clutches, and control method |
| CN204024893U (en) * | 2014-09-02 | 2014-12-17 | 毅联实业(上海)有限公司 | The one-way element assembly of automobile-used gas starter motor |
| CN105402070A (en) * | 2015-12-14 | 2016-03-16 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Engagement and disengagement transmission device for air turbine starter |
| CN205330860U (en) * | 2015-12-14 | 2016-06-22 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Air turbine starter output shaft assembly |
| CN206889150U (en) * | 2017-06-27 | 2018-01-16 | 中国航发常州兰翔机械有限责任公司 | A kind of starter inserted type output shaft assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109139326A (en) | 2019-01-04 |
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