阅读说明：本技术 一种防反带应急脱开机构 (Anti-reverse belt emergency release mechanism ) 是由 陈利强 童琦琦 吕国川 孙唯一 于 2020-12-24 设计创作，主要内容包括：本发明属于发动机起动机领域,公开了一种防反带应急脱开机构,包括外输出轴和内输出轴,外输出轴和内输出轴中间轴向上具有通孔,小轴一端与外输出轴固定连接,小轴的另一端与内输出轴固定连接,小轴中间具有环状的内凹槽；外输出轴和内输出轴咬合接触,咬合接触端使得内输出轴朝一个方向转动时能够带动外输出轴朝相同的方向转动,内输出轴朝另一个方向转动时不能带动外输出轴转动。此结构设计简单紧凑,适合应用于有防止反带的结构应用,具有较大的工程价值。(The invention belongs to the field of engine starters, and discloses an anti-reverse-belt emergency release mechanism which comprises an outer output shaft and an inner output shaft, wherein through holes are formed in the middle shafts of the outer output shaft and the inner output shaft upwards; the outer output shaft is in meshed contact with the inner output shaft, the meshed contact end enables the inner output shaft to drive the outer output shaft to rotate in the same direction when rotating in one direction, and the inner output shaft cannot drive the outer output shaft to rotate when rotating in the other direction. The structure is simple and compact in design, is suitable for structural application for preventing reverse belts, and has a high engineering value.)

1. An anti-reverse belt emergency release mechanism is characterized by comprising an outer output shaft (1) and an inner output shaft (2), wherein a through hole is formed in the middle shaft of the outer output shaft (1) and the middle shaft of the inner output shaft (2) upwards, one end of a small shaft (5) is fixedly connected with the outer output shaft (1), the other end of the small shaft (5) is fixedly connected with the inner output shaft (2), and an annular inner groove is formed in the middle of the small shaft (5); the outer output shaft (1) is in meshed contact with the inner output shaft (2), the meshed contact ends enable the inner output shaft (2) to drive the outer output shaft (1) to rotate towards the same direction when rotating towards one direction, and the inner output shaft (2) cannot drive the outer output shaft (1) to rotate towards the other direction.

2. Anti-wind-back emergency release mechanism according to claim 1, characterized in that the small shaft (5) is connected to the inner output shaft (2) by means of a second pin (8), the small shaft (5) being connected to the outer output shaft (1) by means of a first pin (4).

3. Anti-reverse-band emergency release mechanism according to claim 2, characterized in that the small shaft (5) and the outer output shaft (1) are mutually clamped by means of splines (3).

4. Anti-recoil emergency release mechanism according to claim 1, characterized in that the outer output shaft (1) has a cavity therein, the inner groove section of the small shaft (5) is located in the cavity of the outer output shaft (1), and the first pin (4) is located on the side of the cavity remote from the inner output shaft (2).

5. An anti-reverse-belt emergency release mechanism according to claim 4, characterized in that a step structure is further arranged in the cavity, a section of the small shaft (5) in the cavity is further sleeved with a bushing (7), the spring (6) is sleeved on the small shaft (5), one end of the spring (6) is connected with the bushing (7), and the other end of the spring (6) is connected with the step structure.

6. Anti-recoil emergency release mechanism according to claim 5, wherein the spring (6) provides a pre-load to tension the outer output shaft (1) and the inner output shaft (2).

7. Anti-wind-back emergency release mechanism, according to claim 6, characterized in that the internal recess of the small shaft (5) is in the ring surface of the spring (6).

8. Anti-wind-back emergency release mechanism, according to claim 1, characterized in that the inner groove of the small shaft (5) has an inwardly converging minimum section radius d_minCalculated as follows:

wherein T is a protection torque which is far smaller than the output torque of the starter; tau is_maxIs the material shear strength.

Technical Field

The invention belongs to the field of engine starters, relates to a rotating shaft connecting mechanism, and particularly relates to an anti-reverse belt emergency disengaging mechanism.

Background

The starter output shaft is a key component for transmitting mechanical energy of the starter to an accessory gearbox of an aircraft engine and rotating a high-pressure rotor of the engine through a large torque belt to start the engine. When the high-pressure rotor with the rotary engine is started, the output bearing of the starter transmits larger torque, when the engine is started, the starter stops working, the rotating speed of the high-pressure rotor of the engine continues to rise, and the output shaft with the rotary engine continues to increase speed. Therefore, after the starter stops working, the high-pressure rotor may drive the output shaft of the starter to work, and if the clutch of the starter fails, the engine is damaged by reversely driving the starter

Disclosure of Invention

The purpose of the invention is as follows: the anti-reverse belt emergency release mechanism is simple in structure and convenient to install, and can prevent a high-pressure rotor reverse belt starter from rotating.

The technical scheme of the invention is as follows:

an anti-reverse belt emergency release mechanism comprises an outer output shaft and an inner output shaft, wherein through holes are formed in the middle shafts of the outer output shaft and the inner output shaft upwards, one end of a small shaft is fixedly connected with the outer output shaft, the other end of the small shaft is fixedly connected with the inner output shaft, and an annular inner groove is formed in the middle of the small shaft; the outer output shaft is in meshed contact with the inner output shaft, the meshed contact end enables the inner output shaft to drive the outer output shaft to rotate in the same direction when rotating in one direction, and the inner output shaft cannot drive the outer output shaft to rotate when rotating in the other direction.

Furthermore, the staff passes through the second pin and is connected with interior output shaft, and the staff passes through first pin and outer output shaft connection.

Furthermore, the small shaft and the outer output shaft are mutually clamped through a spline.

Furthermore, a cavity is arranged in the outer output shaft, one section of the inner groove of the small shaft is positioned in the cavity of the outer output shaft, and the first pin is positioned on one side of the cavity, which is far away from the inner output shaft.

Furthermore, a step structure is arranged in the cavity, a section of the small shaft in the cavity is further sleeved with a bushing, the spring is sleeved on the small shaft, one end of the spring is connected with the bushing, and the other end of the spring is connected with the step structure.

Further, the spring provides pretightening force to tighten the outer output shaft and the inner output shaft.

Further, the inner groove of the small shaft is arranged in the ring surface of the spring.

Further, the minimum section radius d of the small shaft is formed by inward contraction of the inner groove_minCalculated as follows:

wherein T is a protection torque which is far smaller than the output torque of the starter; tau is_maxIs the material shear strength.

The invention has the beneficial effects that: the invention belongs to the field of engine starters, and relates to an anti-reverse belt emergency release mechanism. The release mechanism adopts an inclined plane connecting structure and is connected through a small shaft with pretightening force to achieve the function of preventing the reverse belt, and when the mechanism is subjected to the reverse belt, the release mechanism is automatically released to protect the connecting mechanism from being damaged. The anti-reverse belt mechanism is compact in structure, convenient to install, suitable for structural application with anti-reverse belt and high in practical application value.

Drawings

FIG. 1 is a schematic view of the mounting structure of the present invention;

FIG. 2 is a schematic view of the reverse disengagement configuration of the present invention;

FIG. 3 is a cross-sectional view of FIG. 1;

the device comprises a shaft body, a shaft cover, a first pin, a second pin, a spring, a bushing and a sleeve, wherein the shaft body comprises 1-an outer output shaft, 2-an inner output shaft, 3-a spline, 4-a first pin, 5-a small shaft, 6-a spring, 7-a bushing and 8-a second pin.

Detailed Description

This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.

An anti-reverse belt emergency release mechanism comprises an outer output shaft 1 and an inner output shaft 2, wherein a through hole is formed in the middle shaft of the outer output shaft 1 and the middle shaft of the inner output shaft 2 upwards, one end of a small shaft 5 is fixedly connected with the outer output shaft 1, the other end of the small shaft 5 is fixedly connected with the inner output shaft 2, and an annular inner groove is formed in the middle of the small shaft 5; the outer output shaft 1 is in meshed contact with the inner output shaft 2, the meshed contact ends enable the inner output shaft 2 to drive the outer output shaft 1 to rotate towards the same direction when rotating towards one direction, and the inner output shaft 2 cannot drive the outer output shaft 1 to rotate towards the other direction.

The small shaft 5 is connected with the inner output shaft 2 through a second pin 8, and the small shaft 5 is connected with the outer output shaft 1 through a first pin 4.

The small shaft 5 and the outer output shaft 1 are mutually clamped through a spline 3.

The outer output shaft 1 is internally provided with a cavity, one section of the inner groove of the small shaft 5 is positioned in the cavity of the outer output shaft 1, and the first pin 4 is positioned on one side of the cavity, which is far away from the inner output shaft 2.

Still have the stair structure in the cavity, staff 5 still overlaps on one section in the cavity and is equipped with bush 7, and spring 6 overlaps on staff 5, and bush 7 is connected to the one end of spring 6, and the stair structure is connected to the other end of spring 6.

The spring 6 provides a pre-tightening force to tighten the outer output shaft 1 and the inner output shaft 2.

The inner recess of the small shaft 5 is in the annulus of the spring 6.

Minimum section radius d of the inner groove of the small shaft 5 which is inwardly contracted_minCalculated as follows:

wherein T is a protection torque which is far smaller than the output torque of the starter; tau is_maxIs the material shear strength.

The present invention will be described in further detail with reference to the following embodiments.

Referring to fig. 1 and 2, the working principle of the invention is as follows: when the device is in normal operation, the inner output shaft 2 rotates clockwise to drive the outer output shaft 1 to rotate, and the small shaft 5 tightly pulls the outer output shaft 1 and the inner output shaft 2 together; when the reverse belt occurs, the rotating speed of the outer output shaft 1 is higher than that of the inner output shaft 2, the outer output shaft 1 is separated along the inclined plane and separated axially, the small shaft 5 is twisted and cut along the necking section, and the outer output shaft 1 is completely separated from the inner output shaft 2, so that the reverse belt preventing effect is realized.

An anti-reverse belt emergency release mechanism is characterized in that: the transmission anti-reverse belt emergency release mechanism comprises an outer output shaft 1, an inner output shaft 2, a spline 3, a pin 4, a small shaft 5, a spring 6, a bushing 7 and a pin 8; the outer output shaft 1 is used for outputting torque backwards, the inner output shaft 2 is used for transmitting torque of a starter, the spline 3 is used for circumferentially fixing the small shaft, the pin 4 is used for connecting the spline and the small shaft, the small shaft 5 is used for connecting the outer output shaft and the inner output shaft, the spring 6 is used for providing axial pre-tightening force, the bush 7 is used for supporting the spring, and the pin 8 is used for connecting the small shaft and the inner output shaft.

The spline 3 circumferentially fixes the small shaft 5 through the pin 4, and has the advantages of compact structure, convenience in installation and no influence on the structural design of the outer side of the shaft.

The small shaft 5 is designed with a necking section, and the section radius is calculated as follows:wherein d is_minIs the minimum cross-sectional radius; t is a protection torque which is far smaller than the output torque of the starter; tau is_maxThe material shear strength;

the spring 6, the small shaft 5 and the bush 7 provide axial pre-tightening force together to tightly connect the outer output shaft 1 and the inner output shaft 2 together.

The matching surface of the outer output shaft 1 and the inner output shaft 2 is designed to be an inclined surface, the outer output shaft 1 and the inner output shaft 2 are tightly connected during normal work, and when the outer output shaft 1 is reversely provided with the inner output shaft 2, the structure is separated along the inclined surface and axially separated.