CN216343549U

CN216343549U - Limiting mechanism based on sliding clutch

Info

Publication number: CN216343549U
Application number: CN202122835963.1U
Authority: CN
Inventors: 秦峰伟; 陈培磊; 罗勇
Original assignee: Qingan Group Co Ltd
Current assignee: Qingan Group Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-04-19
Anticipated expiration: 2031-11-18

Abstract

The utility model discloses a limiting mechanism based on a sliding clutch, which comprises an input shaft, a shell, the sliding clutch, a thrust bearing, an outer nut, an inner nut, a stroke threaded sleeve, a right stop block, a left stop block, a clutch push block, a disc spring push block and a disc spring. The utility model generates axial force through a thread mechanism consisting of the outer nut and the inner nut, drives the sliding clutch to generate friction braking torque, and realizes the limiting function. The reverse braking is completed through the axial force released by the compression of the disc spring and the transmission clearance between the input shaft and the inner ring of the sliding clutch, the structure is simple and compact, the function is reliable, and the limiting precision and the limiting capacity are relatively higher.

Description

Limiting mechanism based on sliding clutch

Technical Field

The utility model relates to the field of rotating mechanical transmission systems, in particular to a limiting mechanism based on a sliding clutch, which provides a limiting function for a mechanical transmission system.

Background

In the weapon cabin door driving system, as the weapon launching mode tends to be embedded, the opening/closing of the cabin door is required, and the cabin door must be ensured to operate to a specified position within a specified time, and the shorter the actuation time, the better. Therefore, a limit device is needed, which can normally transmit load in the working stroke range and can hold and brake the transmission line after exceeding the stroke.

The existing mechanical limiting mechanism mainly has two types: one is that the motion amount is limited by the action of the travel nut and the stop blocks at the left end and the right end, but the stop blocks are easy to be damaged by overload under the working environment of high speed and heavy load, thereby causing the jamming of products. The second is to provide axial force by utilizing a thread structure, realize braking and limiting through a friction pair, and solve the problems of wear failure and bonding at low temperature of the friction plate in the limiting process.

Disclosure of Invention

The utility model aims to provide a limiting mechanism based on a sliding clutch, which solves the problem of product clamping stagnation caused by damage of a stop block during over-stroke work in a rotary mechanical transmission system and can also avoid the influence of friction plate abrasion and low-temperature bonding on a limiting function.

In order to realize the task, the utility model adopts the following technical scheme:

the utility model provides a stop gear based on slip clutch, includes input shaft, casing, slip clutch, thrust bearing, outer nut, inner nut, stroke swivel nut, right dog, left dog, clutch ejector pad, dish spring, wherein:

the input shaft is arranged in the shell, and one end of the input shaft penetrates out of the shell; the inner surface of the stroke threaded sleeve is arranged on the input shaft, the inner nut is sleeved outside the stroke threaded sleeve, and the outer nut is sleeved outside the inner nut; the outer nut can move in the axial direction of the shell, and can rotate in a certain range relative to the inner nut;

the left stop block and the right stop block are respectively arranged at two ends of the travel screw sleeve and are sleeved on the input shaft in a clearance fit manner; the inner ring of the sliding clutch is connected with a boss on the input shaft through a groove, and the outer ring of the sliding clutch is fixed in the shell; the clutch push block is arranged on the right end face of the sliding clutch and is in contact with the inner ring of the sliding clutch; the thrust bearing is positioned between the left stop block and the clutch push block; one end of the disc spring pushing block is contacted with the left end face of the inner ring of the sliding clutch, and a disc spring is arranged between the other end of the disc spring pushing block and the left end face of the shell.

Further, a gap exists between the groove on the inner ring of the sliding clutch and the boss of the input shaft, and the input shaft can rotate reversely by a certain angle.

Furthermore, an end cover is fixed at the right end of the shell through a screw, the right end of the input shaft is installed inside the end cover through a bearing, and the other end of the input shaft penetrates out of the left end face of the shell.

Further, the inner nut is sleeved outside the stroke threaded sleeve in a threaded connection mode, and the outer nut is sleeved outside the inner nut in a threaded connection mode.

Further, the outer surface of the outer nut is assembled on the inner wall of the shell through a boss and is arranged in a groove along the axial direction.

Furthermore, a pin penetrates through the outer nut in the radial direction and is inserted into a limiting groove arranged on the inner nut in the circumferential direction.

Compared with the prior art, the utility model has the following technical characteristics:

the utility model generates axial force through a thread mechanism consisting of the outer nut and the inner nut, drives the sliding clutch to generate friction braking torque, and realizes the limiting function. And reverse brake release is completed through the axial force released by compression of the disc spring and the transmission clearance between the input shaft and the inner ring of the sliding clutch. Simple and compact structure, reliable function, and higher limit precision and capacity.

Drawings

FIG. 1 is a schematic view of a spacing mechanism of the present invention;

FIG. 2 is a slip clutch diagram;

FIG. 3 is a diagram of a sliding clutch inner race groove;

FIG. 4 is a schematic illustration of the connection of the slip clutch to the input shaft;

FIG. 5 is a schematic view of a slip clutch outer race boss;

FIG. 6 is a schematic diagram of the clockwise rotation limit of the input shaft;

fig. 7 is a schematic diagram of the counterclockwise rotation limit of the input shaft.

The reference numbers in the figures illustrate: the clutch comprises an input shaft 1, a shell 2, a sliding clutch 3, a thrust bearing 4, an outer nut 5, an inner nut 6, a 7-stroke threaded sleeve, a screw 8, an end cover 9, a right stop 10, a pin 11, a left stop 12, a clutch push block 13, a disc spring push block 14 and a disc spring 15.

Detailed Description

As shown in fig. 1, the utility model discloses a limiting mechanism based on a sliding clutch, which comprises an input shaft 1, a shell 2, a sliding clutch 3, a thrust bearing 4, an outer nut 5, an inner nut 6, a stroke threaded sleeve 7, a screw 8, an end cover 9, a right stop block 10, a pin 11, a left stop block 12, a clutch push block 13, a disc spring push block 14 and a disc spring 15, wherein:

an end cover 9 is fixed at the right end of the shell 2 through a screw 8, the input shaft 1 is arranged in the shell 2, the right end of the input shaft is arranged in the end cover 9 through a bearing, and the other end of the input shaft penetrates out of the left end face of the shell 2; the inner surface of a stroke threaded sleeve 7 is arranged on the input shaft 1 through a spline, an inner nut 6 is sleeved outside the stroke threaded sleeve 7 in a threaded connection mode, an outer nut 5 is sleeved outside the inner nut 6 in a threaded connection mode, and the outer surface of the outer nut 5 is assembled on the inner wall of the shell 2 through a boss and is arranged in a groove arranged in the axial direction, so that the outer nut 5 can move in the axial direction of the shell 2; and the outer nut 5 can rotate in a certain range relative to the inner nut 6, specifically: the pin 11 radially penetrates through the outer nut 5 and is inserted into a section of limiting groove which is arranged on the inner nut 6 along the circumferential direction, so that the relative movement of the pin and the inner nut is limited within a certain range; the left stop block 12 and the right stop block 10 are respectively arranged at two ends of the stroke screw sleeve 7, and the left stop block 12 and the right stop block 10 are sleeved on the input shaft 1 in a clearance fit manner; the inner ring of the sliding clutch 3 is connected with a boss on the input shaft 1 through a groove, and the outer ring of the sliding clutch 3 is fixed in the shell 2; the clutch pushing block 13 is arranged on the right end face of the sliding clutch 3 and is in contact with the inner ring of the sliding clutch 3; the thrust bearing 4 is positioned between the left stop block 12 and the clutch push block 13; one end of the disc spring pushing block 14 is contacted with the left end face of the inner ring of the sliding clutch 3, and a disc spring 15 is arranged between the other end of the disc spring pushing block and the left end face of the shell 2.

A gap is reserved between the groove on the inner ring of the sliding clutch 3 and the boss of the input shaft 1, the input shaft 1 is allowed to rotate reversely by a certain angle, so that the compression force of the disc spring 15 is released and acts on the disc spring pushing block 14 to push the inner ring of the sliding clutch 3 to move right, the axial force in the sliding clutch 3 disappears, and the limiting function is released.

The working principle of the scheme is as follows:

1. normal working state

External torque is transmitted to the limiting mechanism through the input shaft 1, and the input shaft 1 is connected with the movable stroke threaded sleeve 7 through a spline to rotate. The inner surface and the outer surface of the inner nut 6 are both provided with threads and are respectively connected with the stroke thread sleeve 7 and the outer nut 5 through inner threads and outer threads, the inner surface of the outer nut 5 is a four-head thread, the outer surface of the outer nut is matched with a groove axially arranged on the inner wall of the shell 2 through a boss so as to limit the rotary motion of the outer nut 5, the inner nut and the outer nut are connected through a pin 11, and the inner nut and the outer nut move relatively in a certain range due to the action of a limiting groove.

In the normal working stroke range, the outer nut 5 in the limiting mechanism makes axial movement in the groove of the shell 2, the inner nut 6 can rotate a certain angle relative to the outer nut 5, and the input shaft 1 drives the inner ring of the sliding clutch 3 to normally operate. The disc spring 15 has certain pre-tightening, so that the inner ring of the sliding clutch 3 is prevented from being pushed by axial force generated in normal operation to generate braking torque.

2. Over-travel operating state

a. When the input shaft 1 rotates clockwise, the stroke threaded sleeve 7 is driven to rotate, due to the threaded connection effect, the inner nut 6 and the outer nut 5 move leftwards, the outer nut moves axially to the left end limit position to be in contact with the left stop block 12, the clutch push block 13 is driven to move axially through the thrust bearing 4, according to the movement characteristic of the sliding clutch, the inner ring of the sliding clutch 3 is subjected to the axial force effect of the clutch push block 13, and the roller is in contact with the inner raceway and the outer raceway to generate friction braking torque to control and brake the input shaft 1, so that the limiting function is achieved. At this time, the axial force is transmitted to the disc spring pushing block 14 through the inner ring of the sliding clutch 3, and the disc spring 15 is compressed to store energy. See fig. 6.

b. When the input shaft 1 rotates anticlockwise and is seen from the left end of the drawing 1, the stroke threaded sleeve 7 is driven to rotate, the inner nut 6 and the outer nut 5 move axially to the right, the outer nut moves axially to the right end limit position, at the moment, the stroke threaded sleeve 7 moves leftwards, axial force is applied to the sliding clutch 3 through the stroke threaded sleeve 7, the left stop block 12, the thrust bearing 4 and the clutch push block 13, and friction braking torque is generated to hold and brake the input shaft 1, so that the bidirectional limit function is realized. The axial force is likewise transmitted via the inner ring of the slip clutch 3 and the disc spring push block 14 to the disc spring 15. See fig. 7.

3. Reverse braking-off state

When the limiting mechanism is in a braking limiting state, because a boss of the input shaft 1 is connected with a groove of an inner ring of the sliding clutch 3 to form a certain transmission gap, the input shaft 1 can rotate reversely by a certain angle to drive the stroke threaded sleeve 7 to move, and the inner nut 6 and the outer nut 5 move axially to the right. Meanwhile, the compression force of the disc spring 15 is released, the inner ring of the sliding clutch 3 is pushed to move right, the axial force in the sliding clutch 3 disappears, and the brake holding is released.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equally replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.

Claims

1. The utility model provides a stop gear based on slip clutch, its characterized in that includes input shaft (1), casing (2), slip clutch (3), thrust bearing (4), outer nut (5), inner nut (6), stroke swivel nut (7), right dog (10), left dog (12), clutch ejector pad (13), dish spring ejector pad (14), dish spring (15), wherein:

the input shaft (1) is arranged in the shell (2), and one end of the input shaft penetrates out of the shell (2); the inner surface of the stroke threaded sleeve (7) is arranged on the input shaft (1), the inner nut (6) is sleeved outside the stroke threaded sleeve (7), and the outer nut (5) is sleeved outside the inner nut (6); the outer nut (5) can move in the axial direction of the shell (2), and the outer nut (5) can rotate relative to the inner nut (6) within a certain range;

the left stop block (12) and the right stop block (10) are respectively arranged at two ends of the stroke threaded sleeve (7), and the left stop block (12) and the right stop block (10) are sleeved on the input shaft (1) in a clearance fit manner; the inner ring of the slip clutch (3) is connected with a boss on the input shaft (1) through a groove, and the outer ring of the slip clutch (3) is fixed in the shell (2); the clutch push block (13) is arranged on the right end face of the sliding clutch (3) and is in contact with the inner ring of the sliding clutch (3); the thrust bearing (4) is positioned between the left stop block (12) and the clutch push block (13); one end of the disc spring pushing block (14) is contacted with the left end face of the inner ring of the sliding clutch (3), and a disc spring (15) is arranged between the other end of the disc spring pushing block and the left end face of the shell (2).

2. The limiting mechanism based on the sliding clutch according to the claim 1, characterized in that, there is a gap between the groove on the inner ring of the sliding clutch (3) and the boss of the input shaft (1), allowing the input shaft (1) to rotate reversely by a certain angle.

3. The limiting mechanism based on the sliding clutch is characterized in that an end cover (9) is fixed at the right end of the shell (2) through a screw (8), the right end of the input shaft (1) is installed inside the end cover (9) through a bearing, and the other end of the input shaft penetrates through the left end face of the shell (2).

4. The limiting mechanism based on a sliding clutch according to claim 1, characterized in that the inner nut (6) is threaded on the outside of the stroke nut (7) and the outer nut (5) is threaded on the outside of the inner nut (6).

5. Limiting mechanism based on a sliding clutch according to claim 1, characterized in that the outer surface of the outer nut (5) fits with a boss in an axially arranged groove in the inner wall of the housing (2).

6. A limiting mechanism based on a sliding clutch according to claim 1, characterized in that the pin (11) is used to pass through the outer nut (5) in radial direction and to be inserted into a limiting groove arranged in circumferential direction on the inner nut (6).