阅读说明：本技术 一种丝杠支撑及限位结构 (Lead screw supporting and limiting structure ) 是由 吴昊 王丹阳 魏伊 魏思维 王晓露 王鑫 李林 聂振金 牛光冉 于 2021-01-20 设计创作，主要内容包括：本发明涉及一种丝杠支撑及限位结构,包括丝杆、螺母、作动杆、螺母限位块、丝杆限位块、支撑环、圆柱销。螺母限位块安装在螺母上,丝杆限位块和支撑环通过圆柱销或其他紧固方式安装在丝杆上。本发明通过丝杠限位块、支撑环结构以及作动杆的配合实现丝杠自身支撑,当丝杠载荷较大时,作动杆或丝杆发生弯曲变形,支撑环外壁面与作动杆内孔接触,提供支撑力,可大幅提高丝杠的抗弯刚度。同时,通过螺母限位块和丝杆限位块实现丝杠到位限位,防止丝杠螺母脱出。(The invention relates to a screw rod supporting and limiting structure which comprises a screw rod, a nut, an actuating rod, a nut limiting block, a screw rod limiting block, a supporting ring and a cylindrical pin. The nut limiting block is arranged on the nut, and the screw rod limiting block and the support ring are arranged on the screw rod through a cylindrical pin or other fastening modes. According to the invention, the screw rod self-supporting is realized through the matching of the screw rod limiting block, the support ring structure and the actuating rod, when the load of the screw rod is larger, the actuating rod or the screw rod is bent and deformed, the outer wall surface of the support ring is contacted with the inner hole of the actuating rod, the supporting force is provided, and the bending rigidity of the screw rod can be greatly improved. Simultaneously, realize the lead screw spacing that targets in place through nut stopper and lead screw stopper, prevent that lead screw nut from deviating from.)

1. The utility model provides a lead screw supports and limit structure which characterized in that: the screw rod mechanism comprises a screw rod (1), a nut (2), an actuating rod (3), a nut limiting block (4), a screw rod limiting block (5), a support ring (6) and a cylindrical pin (7);

the nut (2) is sleeved on the screw rod (1), and the front end of the nut (2) is provided with a nut limiting block (4); the screw rod limiting block (5) is of an annular structure, first limiting bulges (5-1) are processed on the outer wall surface, 2 first positioning bulges (5-2) are processed on the inner wall surface, the 2 first positioning bulges (5-2) are symmetrical along the center of the screw rod limiting block, a boss (5-3) is processed on the outer wall surface corresponding to each first positioning bulge (5-2), two first pin holes (5-4) are processed on the screw rod limiting block, and the two first pin holes (5-4) are symmetrical along the center of the screw rod limiting block;

the support ring (6) is of an annular structure, two second pin holes (6-2) are machined in the support ring (6), the two second pin holes (6-2) are symmetrical along the center of the support ring (6), two clamping grooves (6-1) are machined in the inner wall surface of the support ring (6), and the two clamping grooves (6-1) are symmetrical along the center of the support ring (6);

the screw rod limiting block (5) and the support ring (6) are sleeved together, a boss (5-3) of the screw rod limiting block (5) is clamped in a clamping groove (6-1) of the support ring (6), and two first pin holes (5-4) of the screw rod limiting block (5) and two second pin holes (6-2) of the support ring (6) are on the same straight line; the integral structure formed by the two is arranged on the screw rod (1), the front end of the screw rod (1) is processed with an installation seat (1-1), the installation seat (1-1) is processed with two first installation grooves (1-2) and two third pin holes (1-3), the two first installation grooves (1-2) are symmetrical along the central axis of the screw rod (1), and the two third pin holes (1-3) are symmetrical along the central axis of the screw rod (1); after the screw rod limiting block (5) is installed in place, the first positioning bulge (5-2) of the screw rod limiting block (5) is clamped in the first installation groove (1-2) to play a role in transmitting torque;

the cylindrical pin (7) penetrates through the support ring (6), the screw rod limiting block (5) and the pin hole of the screw rod (1) to fix the support ring (6), the screw rod limiting block (5) and the screw rod (1) and prevent the support ring (6) and the screw rod limiting block (5) from falling off from the screw rod (1);

the actuating rod (3) is sleeved outside the screw rod (1) and is arranged at the front end of the nut (2).

2. The screw supporting and limiting structure of claim 1, wherein: the upper front end of the nut is provided with a second mounting groove (2-1) for mounting a nut limiting block;

the nut limiting block is of an annular structure, a second positioning protrusion (4-1) and a second limiting protrusion (4-2) are processed on the outer wall surface of the nut limiting block, the second positioning protrusion (4-1) and the second limiting protrusion (4-2) form a finger-shaped structure, and the second positioning protrusion (4-1) is located in the second mounting groove (2-1), so that the nut limiting block and the nut move simultaneously and play a role in transmitting torque;

when the nut is in work, when the nut extends out of the foremost end of the screw rod (1), the second limiting bulge (4-2) is in contact with the first limiting bulge (5-1), the nut stops rotating relative to the screw rod, and meanwhile the second positioning bulge (4-1) is clamped in the second mounting groove (2-1), so that the nut is limited and prevented from falling off.

3. The screw supporting and limiting structure of claim 1, wherein: the outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod.

4. The screw rod supporting and limiting structure according to claim 3, wherein: the clearance is less than 0.1 mm.

5. The screw supporting and limiting structure of claim 1, wherein: the first positioning bulge (5-2) is in interference fit with the first mounting groove (1-2).

6. The screw rod supporting and limiting structure according to claim 5, wherein: the interference is between 0.02mm and 0.04 mm.

Technical Field

The invention belongs to the field of mechanical transmission, and relates to a screw rod supporting and limiting structure.

Background

The actuating system of a cargo door of an airplane adopts an electromechanical actuating scheme of a motor, a speed reducer and a lead screw, and an actuating cylinder is omitted to reduce the size of a linear actuating part in order to ensure that the actuator does not interfere with components such as a top decorative plate and the like during movement. Because the actuator is long, after the actuator cylinder is cancelled, the bending rigidity of the lead screw is poor, and the lead screw extends out in place without mechanical limitation, so that the risk of the lead screw and the lead screw nut falling off exists.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the screw supporting and limiting structure is provided, screw supporting and in-place limiting are achieved, and screw supporting rigidity is improved.

The technical scheme of the invention is as follows:

a screw rod supporting and limiting structure comprises a screw rod, a nut, an actuating rod, a nut limiting block, a screw rod limiting block, a supporting ring and a cylindrical pin;

the nut is sleeved on the screw rod, and the front end of the nut is provided with a nut limiting block; the screw rod limiting block is of an annular structure, first limiting bulges are processed on the outer wall surface, 2 first positioning bulges are processed on the inner wall surface, the 2 first positioning bulges are symmetrical along the center of the screw rod limiting block, a boss is processed on the outer wall surface corresponding to each first positioning bulge, two first pin holes are processed on the screw rod limiting block, and the two first pin holes are symmetrical along the center of the screw rod limiting block;

the support ring is of an annular structure, two second pin holes are machined in the support ring, the two second pin holes are symmetrical along the center of the support ring, two clamping grooves are machined in the inner wall surface of the support ring, and the two clamping grooves are symmetrical along the center of the support ring;

the screw rod limiting block and the support ring are sleeved together, a boss of the screw rod limiting block is clamped in a clamping groove of the support ring, and two first pin holes of the screw rod limiting block and two second pin holes of the support ring are in the same straight line; the integral structure formed by the two is arranged on the screw rod, the front end of the screw rod is processed with an installation seat, the installation seat is processed with two first installation grooves and two third pin holes, the two first installation grooves are symmetrical along the central axis of the screw rod, and the two third pin holes are symmetrical along the central axis of the screw rod; after the screw rod limiting block is installed in place, the first positioning bulge of the screw rod limiting block is clamped in the first installation groove to play a role in transmitting torque;

the cylindrical pin penetrates through the support ring, the screw rod limiting block and the pin hole of the screw rod, so that the support ring, the screw rod limiting block and the screw rod are fixed, and the support ring and the screw rod limiting block are prevented from falling off from the screw rod;

the actuating rod is sleeved outside the screw rod and is arranged at the front end of the nut.

The upper front end of the nut is provided with a second mounting groove for mounting a nut limiting block;

the nut limiting block is of an annular structure, a second positioning protrusion and a second limiting protrusion are processed on the outer wall surface of the nut limiting block, the second positioning protrusion and the second limiting protrusion form a finger-shaped structure, and the second positioning protrusion is located in the second mounting groove, so that the nut limiting block and the nut move simultaneously, and the torque transmission effect is achieved;

during operation, when the nut stretches out to the foremost end of the screw rod, the second limiting protrusion is in contact with the first limiting protrusion, the nut stops rotating relative to the screw rod, and meanwhile, the second positioning protrusion is clamped in the second mounting groove, so that the nut is limited, and the nut is prevented from falling off.

The outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod.

The clearance is less than 0.1 mm.

And the first positioning bulge and the first mounting groove are in interference fit.

The interference is between 0.02mm and 0.04 mm.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the screw rod self-supporting is realized through the matching of the screw rod limiting block, the support ring structure and the actuating rod, when the load of the screw rod is larger, the actuating rod or the screw rod is bent and deformed, the outer wall surface of the support ring is contacted with the inner hole of the actuating rod, the supporting force is provided, and the bending rigidity of the screw rod can be greatly improved.

(2) The screw rod in-place limiting is realized through the nut limiting block and the screw rod limiting block, and the screw rod nut is prevented from being separated.

Drawings

FIG. 1 is a view of a screw support and limit structure;

FIG. 2 is a view showing the end structure of the screw rod;

FIG. 3 is a view of the nut;

FIG. 4 is a diagram of a nut stop block;

FIG. 5 is a diagram of a screw rod stopper and a support ring;

FIG. 6 is a diagram of a screw in-position limiting structure;

fig. 7 is a view showing a support ring support structure.

Detailed Description

The invention is further elucidated with reference to the drawing.

The invention designs a screw supporting and in-place limiting structure on the screw, so that the screw is ensured to have enough bending rigidity and is not separated after being extended in place.

As shown in fig. 1, the screw supporting and limiting structure is composed of a screw 1, a nut 2, an actuating rod 3, a nut limiting block 4, a screw limiting block 5, a supporting ring 6 and a cylindrical pin 7. The nut limiting block 4 is arranged on the nut 2, and the screw rod limiting block 5 and the support ring 6 are arranged on the screw rod 1 through a cylindrical pin 7 or other fastening modes.

Specifically, as shown in fig. 3, a second mounting groove 2-1 structure is formed on the nut and used for mounting the nut limiting block. As shown in figure 2, the front end of the screw rod is provided with an installation seat 1-1, and the installation seat 1-1 is provided with a first installation groove 1-2 and a third pin hole 1-3. As shown in FIG. 4, the nut limiting block is of an annular structure, a second positioning protrusion 4-1 and a second limiting protrusion 4-2 are processed on the outer wall surface, and the second positioning protrusion 4-1 and the second limiting protrusion 4-2 form a finger-shaped structure. The second positioning protrusion 4-1 is positioned in the second mounting groove 2-1 so that the nut stopper and the nut move simultaneously. When the nut extends out of the foremost end of the screw rod 1 during operation, the second limiting bulge 4-2 is in contact with the first limiting bulge 5-1, the nut stops rotating relative to the screw rod, and meanwhile the second positioning bulge 4-1 is clamped in the second mounting groove 2-1, so that the nut is limited and prevented from falling off.

The second mounting groove 2-1 and the second positioning bulge 4-1 are in interference fit, and the interference magnitude is 0.02mm to 0.04 mm.

As shown in fig. 5, the screw rod limiting block 5 is an annular structure, the outer wall surface of the screw rod limiting block is provided with first limiting protrusions 5-1, the inner wall surface of the screw rod limiting block is provided with 2 first positioning protrusions 5-2, the 2 first positioning protrusions 5-2 are symmetrical along the center of the screw rod limiting block, the outer wall surface corresponding to each first positioning protrusion 5-2 is provided with a boss 5-3, the screw rod limiting block is provided with two first pin holes 5-4, and the two first pin holes 5-4 are symmetrical along the center of the screw rod limiting block.

The support ring 6 is of an annular structure, two second pin holes 6-2 are machined in the support ring 6, the two second pin holes 6-2 are symmetrical along the center of the support ring 6, two clamping grooves 6-1 are machined in the inner wall surface of the support ring 6, and the two clamping grooves 6-1 are symmetrical along the center of the support ring 6;

when the screw rod limiting block 5 and the support ring 6 are installed, the boss 5-3 of the screw rod limiting block 5 is clamped in the clamping groove 6-1 of the support ring 6, and two first pin holes 5-4 of the screw rod limiting block 5 and two second pin holes 6-2 of the support ring 6 are on the same straight line; the integral structure formed by the two is arranged on a screw rod 1, an installation seat 1-1 is processed at the front end of the screw rod 1, two first installation grooves 1-2 and two pin holes 1-3 are processed on the installation seat 1-1, the two first installation grooves 1-2 are symmetrical along the central axis of the screw rod 1, and the two pin holes are symmetrical along the central axis of the screw rod 1; after the screw rod limiting block is installed in place, the first positioning bulge 5-2 of the screw rod limiting block 5 is clamped in the first installation groove 1-2 to play a role in transmitting torque.

The first positioning bulge 5-2 and the first mounting groove 1-2 are in interference fit, and the interference magnitude is 0.02mm to 0.04 mm.

And finally, matching pin holes and installing cylindrical pins. The cylindrical pin 7 penetrates through the pin holes of the support ring 6, the screw rod limiting block 5 and the screw rod 1, so that the support ring 6, the screw rod limiting block 5 and the screw rod 1 are fixed, and the support ring 6 and the screw rod limiting block 5 are prevented from falling off from the screw rod 1.

The actuating rod 3 is sleeved outside the screw rod 1 and is arranged at the front end of the nut 2 through a screw.

The outer wall surface of the support ring is in small clearance fit with the inner hole of the actuating rod. The clearance is less than 0.1 mm.

As shown in figure 6, when the screw rod extends out of the head, the screw rod rotates clockwise, the first limiting bulge 5-1 on the screw rod limiting block collides with the second limiting bulge 4-2 on the nut limiting block, and the nut is prevented from extending forwards continuously. The force transmission path at this time is: the screw rod body-the first mounting groove 1-2 of the screw rod-the first positioning bulge 5-2 of the screw rod limiting block-the second positioning bulge 4-2 of the first limiting bulge 5-1 of the screw rod limiting block-the second positioning bulge 4-1 of the nut limiting block-the second mounting groove 2-1 of the nut body. The force transmission path is provided with structural members, so that the bearing capacity is high, and the limit failure caused by deformation can be avoided.

As shown in fig. 7, in the movement process of the screw rod, the outer ring of the support ring is matched with the inner hole of the actuating rod to play a supporting role, so that the bending strength of the screw rod is improved.

According to the screw rod, the support ring and the screw rod limiting block are arranged on the screw rod through a cylindrical pin (or other connecting schemes such as a screw) and the outer ring of the support ring is in small clearance fit with the inner hole of the actuating rod and used as an auxiliary support of the screw rod, so that the bending rigidity of the screw rod is improved. The nut limiting block is installed on the nut, and when the screw rod extends in place, the finger-shaped structure of the screw rod limiting block collides with the finger-shaped structure of the nut limiting block, so that the screw rod is limited in place.

Those skilled in the art will appreciate that the details not described in the present specification are well known.