CN107650077A - A kind of bidirectional spring pre-tightening mechanism - Google Patents

Abstract

The invention relates to a two-way spring pretensioning mechanism, which belongs to the technical field of mechanical transmission. The outer cylinder (1) is a fixed support structure, the inner cylinder (2) can slide axially in the outer cylinder (1), the compression spring (3) is compressed by the pressure plate (5), and has a certain pre-tightening force. The first block (4A) is installed on the pressure plate (5), and can slide in the chute of the outer cylinder (1) and the inner cylinder (2), and the second limit block (4B) is installed on the inner cylinder (2) , the pressing plate (5) fits with the piston (6) without gap, and the piston (6) is the motion output end, which can be stretched or compressed. After the compression spring (3) is preset to a certain pressure during installation, the piston (6) needs to overcome the pretightening force of the same size no matter whether it is compressed or stretched, so that the single spring has the function of two-way pretightening, which is different from the traditional two-way pretightening force. Compared with the pre-tensioning mechanism, it has the characteristics of accurate pre-tightening force, compact structure, small size, easy processing and low cost.

Description

A Two-way Spring Preload Mechanism

technical field

The invention relates to a two-way spring pretensioning mechanism, which belongs to the technical field of mechanical transmission.

Background technique

The spring mechanism is an important functional component in the field of mechanical transmission. Using the preload characteristics of the spring, it can realize force transmission and energy storage. In many applications, the moving parts need to do linear reciprocating motion, requiring the spring mechanism to have preload functions in both positive and negative directions. In the traditional two-way pre-tightening spring mechanism, at least two springs must be installed in two directions to achieve two-way pre-tightening. This principle structure has its disadvantages as follows: many parts, complex principle structure, low reliability; cost High; heavy and bulky, not suitable for occasions with compact overall space and strict weight requirements; it is difficult to achieve accurate and consistent preload of springs in two directions; processing and assembly are difficult.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the traditional two-way spring preloading mechanism in the application occasions where the overall space is compact, the light weight is strict, and the processing and material cost control are taken into account. Compact single-spring bi-directional preload mechanism.

Technical scheme of the present invention:

A two-way spring preload mechanism, the structure includes an outer cylinder 1, an inner cylinder 2, a compression spring 3, a limit block 4A, a limit block 2 4B, a pressure plate 5, and a piston 6;

The outer cylinder 1 is a hollow cylinder with an opening on one side, and the inner side of the cylinder wall of the outer cylinder 1 is provided with an axial chute;

The inner cylinder 2 is a hollow cylinder with an opening on one side. An axial chute is arranged on the inner side of the cylinder wall of the inner cylinder 2. The width of the chute of the inner cylinder 2 is consistent with the width of the chute of the outer cylinder 1. The inner cylinder 2 The length of the chute is greater than the length of the chute of the outer cylinder 1; the inner cylinder 2 is installed in the outer cylinder 1, the position of the chute of the inner cylinder 2 corresponds to the position of the chute of the outer cylinder 1, and the opening of the inner cylinder 2 The direction is consistent with the opening direction of the outer cylinder 1; the outer side of the inner cylinder 2 and the inner side of the outer cylinder 1 have a gap fit, and the inner cylinder 2 can be made in the outer cylinder 1 along the axial direction of the outer cylinder 1. reciprocating motion;

A compression spring 3 is placed axially inside the inner cylinder 2;

The pressure plate 5 is arranged inside the inner cylinder body 2, and one end surface of the pressure plate 5 is pressed on the compression spring 3, and the side surface of the pressure plate 5 is matched with the inner side of the inner cylinder wall of the inner cylinder body 2, and the pressure plate 5 can be moved along the inside of the inner cylinder body 2. The cylinder 2 reciprocates in the axial direction;

The circumferential surface of the pressure plate 5 is fixed with a limit block-4A, and the limit block-4A extends into the chute of the outer cylinder 1 and the inner cylinder 2 at the same time, and the limit block-4A is on the outer cylinder 1 and the inner cylinder 2 The chute reciprocates along the axial direction of the inner cylinder 2;

The piston 6 is arranged inside the inner cylinder 2, and one end surface of the piston 6 is pressed against the other end surface of the pressure plate 5. The axial direction of the inner cylinder 2 reciprocates;

The second limit block 4B is fixedly arranged on the inner side of the cylinder wall of the inner cylinder 2 and close to the opening; the second limit block 4B fits with the other end surface of the piston 6;

When the piston 6 is pushed to the bottom of the inner cylinder 2, the piston 6 pushes the pressure plate 5, so that the compression spring 3 is further compressed;

When the piston 6 is pulled toward the opening direction of the inner cylinder 2, the piston 6 pulls the inner cylinder 2 to move toward the opening of the outer cylinder 1 through the stopper 2 4B, and the stopper 4A restricts the pressure plate 5 to move away from the outer cylinder 1 The opening direction of the movement makes the compression spring 3 further compressed.

The axial chute of the outer cylinder 1 is a U-shaped chute.

The axial chute of the inner cylinder 2 is a U-shaped chute.

There are two axial slide grooves of the outer cylinder body 1 and the inner cylinder body 2 .

The first limiting block 4A and the second limiting block 4B are pins or screws.

The advantages and beneficial effects of the present invention: a two-way spring preload mechanism of the present invention uses a single spring to realize a fully balanced two-way preload, the principle is exquisite, the number of parts is reduced, the complexity of the mechanism is reduced, and the reliability is improved ;Secondly, a single spring is used instead of a double spring, so that the overall volume and weight of the mechanism are greatly reduced, which is more suitable for occasions with compact space and strict weight requirements; thirdly, the two-way spring preload mechanism has a clear structure and simple assembly , easy to process and manufacture, low cost, and conducive to mass production and popularization.

Description of drawings

Fig. 1 is a schematic diagram of the structure and principle of a two-way spring pretensioning mechanism of the present invention.

Among them, 1-outer cylinder, 2-inner cylinder, 3-compression spring, 4A-limit block one, 4B-limit block two, 5-press plate, 6-piston.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

A two-way spring preload mechanism, the structure includes an outer cylinder 1, an inner cylinder 2, a compression spring 3, a limit block 4A, a limit block 2 4B, a pressure plate 5, and a piston 6;

The outer cylinder 1 is a hollow cylinder with an opening on one side, and the inner side of the cylinder wall of the outer cylinder 1 is provided with an axial chute;

The inner cylinder 2 is a hollow cylinder with an opening on one side. An axial chute is arranged on the inner side of the cylinder wall of the inner cylinder 2. The width of the chute of the inner cylinder 2 is consistent with the width of the chute of the outer cylinder 1. The inner cylinder 2 The length of the chute is greater than the length of the chute of the outer cylinder 1; the inner cylinder 2 is installed in the outer cylinder 1, the position of the chute of the inner cylinder 2 corresponds to the position of the chute of the outer cylinder 1, and the opening of the inner cylinder 2 The direction is consistent with the opening direction of the outer cylinder 1; the outer side of the inner cylinder 2 and the inner side of the outer cylinder 1 have a gap fit, and the inner cylinder 2 can be made in the outer cylinder 1 along the axial direction of the outer cylinder 1. reciprocating motion;

A compression spring 3 is placed axially inside the inner cylinder 2, and the two ends of the compression spring 3 are ground flat so that it will not tilt when the inner cylinder 2 is compressed;

The pressure plate 5 is arranged inside the inner cylinder body 2, and one end surface of the pressure plate 5 is pressed on the compression spring 3, and the side surface of the pressure plate 5 is matched with the inner side of the inner cylinder wall of the inner cylinder body 2, and the pressure plate 5 can be moved along the inside of the inner cylinder body 2. The cylinder 2 reciprocates in the axial direction;

The circumferential surface of the pressure plate 5 is fixed with two symmetrical limit blocks-4A, and the two limit blocks-4A extend into the chute of the outer cylinder 1 and the inner cylinder 2 at the same time, and the two limit blocks-4A It can reciprocate in the chute of the outer cylinder 1 and the inner cylinder 2 along the axial direction of the inner cylinder 2;

The piston 6 is arranged inside the inner cylinder 2, and one end surface of the piston 6 is pressed against the other end surface of the pressure plate 5. The axial direction of the inner cylinder 2 reciprocates;

Two limit blocks 24B are fixedly arranged on the inner side of the cylinder wall of the inner cylinder 2 and at a symmetrical position close to the opening; the two limit blocks 24B fit together with the other end surface of the piston 6;

When the piston 6 is pushed to the bottom of the inner cylinder 2, the piston 6 pushes the pressure plate 5, so that the compression spring 3 is further compressed;

When the piston 6 is pulled toward the opening direction of the cylinder body 2, the piston 6 pulls the inner cylinder body 2 to move toward the opening direction of the outer cylinder body 1 through the stopper 2 4B, and the stopper 4A restricts the opening of the pressure plate 5 to the outer cylinder body 1 direction movement, so that the compression spring 3 is further compressed.

The axial chute of the outer cylinder 1 is a U-shaped chute.

The axial chute of the inner cylinder 2 is a U-shaped chute.

There are two axial slide grooves of the outer cylinder body 1 and the inner cylinder body 2 .

The first limiting block 4A and the second limiting block 4B are pins or screws.

Embodiment one

A two-way spring preload mechanism, the structure includes an outer cylinder 1, an inner cylinder 2, a compression spring 3, a limit block 4A, a limit block 2 4B, a pressure plate 5, and a piston 6;

The outer cylinder 1 is a hollow cylinder with an opening on one side, with an outer diameter of 20mm, an axial length of 17.5mm, an inner diameter of 17mm, and a hole depth of 16mm; Axial U-shaped chute, chute width 2mm, length 6mm;

The inner cylinder 2 is a hollow cylinder with an opening on one side, with an outer diameter of 16.5mm, an axial length of 14.5mm, an inner diameter of 14mm, and a hole depth of 13.5mm; 2 axial U-shaped chutes, chute width 2mm, length 7mm;

The inner cylinder 2 is installed in the outer cylinder 1, the chute of the inner cylinder 2 corresponds to the position of the chute of the outer cylinder 1, and the opening direction of the inner cylinder 2 is consistent with the opening direction of the outer cylinder 1; The body 2 can reciprocate in the outer cylinder 1 along the axial direction of the outer cylinder 1;

A compression spring 3 is placed axially inside the inner cylinder 2; the compression spring 3 has an outer diameter of 12.8 mm, a free height of 6.3 mm, and a stiffness of 1.95 N/mm;

The pressure plate 5 is arranged inside the inner cylinder 2, the outer diameter of the pressure plate 5 is 13.5 mm, and the height is 3 mm. One end surface of the pressure plate 5 is pressed on the compression spring 3;

Two symmetrical limit blocks-4A are fixedly arranged on the circumferential surface of the pressure plate 5. The limit block-4A has a diameter of 2 mm and a protruding height of 2 mm. The two limit blocks-4A extend into the outer cylinder 1 and the inner cylinder respectively at the same time. In the chute of 2, the limit block 4A reciprocates in the chute of the outer cylinder 1 and the inner cylinder 2 along the axial direction of the inner cylinder 2;

The piston 6 is arranged inside the inner cylinder body 2. The outer diameter of the piston 6 is 13.5 mm, and the height is 2.5 mm. It has a guide rod with a diameter of 4 mm and a length of 7 mm. One end face of the piston 6 is pressed against the other end face of the pressure plate 5, and the piston 6 Can reciprocate in the inner cylinder 2 along the axial direction of the inner cylinder 2;

Two limiting blocks 4B are fixedly arranged on the inner side of the cylinder wall of the inner cylinder 2 and at a symmetrical position close to the opening. The limiting block 2 4B has a diameter of 2 mm and a protruding height of 2 mm; the limiting block 2 4B is attached to the other end surface of the piston 6 combine;

When the piston 6 is pushed to the bottom of the inner cylinder 2, the piston 6 pushes the pressure plate 5, so that the compression spring 3 is further compressed;

When the piston 6 is pulled toward the opening direction of the inner cylinder 2, the piston 6 pulls the inner cylinder 2 to move toward the opening of the outer cylinder 1 through the stopper 2 4B, and the stopper 4A restricts the pressure plate 5 to move away from the outer cylinder 1 The opening direction of the movement makes the compression spring 3 further compressed.

Embodiment two

A two-way spring preload mechanism, the structure includes an outer cylinder 1, an inner cylinder 2, a compression spring 3, a limit block 4A, a limit block 2 4B, a pressure plate 5, and a piston 6;

The outer cylinder 1 is a hollow cylinder with an opening on one side, with an outer diameter of 35mm, an axial length of 26mm, an inner diameter of 31mm, and a hole depth of 24mm; 3 axial U-shaped chute, chute width 3mm, length 9mm;

The inner cylinder 2 is a hollow cylinder with an opening on one side, with an outer diameter of 30.5mm, an axial length of 23mm, an inner diameter of 26.5mm, and a hole depth of 21mm; 3 axial U-shaped chutes, chute width 2mm, length 11mm;

The inner cylinder 2 is installed in the outer cylinder 1, the chute of the inner cylinder 2 corresponds to the position of the chute of the outer cylinder 1, and the opening direction of the inner cylinder 2 is consistent with the opening direction of the outer cylinder 1; The body 2 can reciprocate in the outer cylinder 1 along the axial direction of the outer cylinder 1;

A compression spring 3 is placed axially inside the inner cylinder 2; the compression spring 3 has an outer diameter of 22mm, a free height of 9.4mm, and a stiffness of 10.33N/mm;

The pressure plate 5 is arranged inside the inner cylinder 2, the outer diameter of the pressure plate 5 is 26 mm, and the height is 3.5 mm. One end surface of the pressure plate 5 is pressed on the compression spring 3;

The circumferential surface of the pressure plate 5 is fixed with 3 evenly distributed limit blocks-4A, the limit block-4A has a diameter of 3mm, and the protrusion height is 4mm, and the two limit blocks-4A extend into the outer cylinder 1 and the inner cylinder at the same time In the chute of the body 2, the limit block 4A reciprocates in the chute of the outer cylinder 1 and the inner cylinder 2 along the axial direction of the inner cylinder 2;

The piston 6 is arranged inside the inner cylinder body 2, the outer diameter of the piston 6 is 26 mm, the height is 3.5 mm, and a guide rod with a diameter of 7 mm and a length of 8 mm is provided. One end face of the piston 6 is pressed against the other end face of the pressure plate 5, and the piston 6 can Reciprocate in the inner cylinder 2 along the axial direction of the inner cylinder 2;

3 limit blocks 2 4B are evenly arranged on the inner side of the cylinder wall of the inner cylinder 2 and close to the opening, the limit block 2 4B has a diameter of 3 mm, and a protruding height of 3 mm; the limit block 2 4B fits with the other end surface of the piston 6 ;

When the piston 6 is pushed to the bottom of the inner cylinder 2, the piston 6 pushes the pressure plate 5, so that the compression spring 3 is further compressed;

When the piston 6 is pulled toward the opening direction of the inner cylinder 2, the piston 6 pulls the inner cylinder 2 to move toward the opening of the outer cylinder 1 through the stopper 2 4B, and the stopper 4A restricts the pressure plate 5 to move away from the outer cylinder 1 The opening direction of the movement makes the compression spring 3 further compressed.

Claims (5)

1. a kind of bidirectional spring pre-tightening mechanism, it is characterised in that the structure includes outer cylinder body (1), inner barrel (2), compresses bullet Spring (3), limited block one (4A), limited block two (4B), pressing plate (5), piston (6)；

Outer cylinder body (1) is the hollow cylinder that side carries opening, and axial slide is provided with the inside of the barrel of outer cylinder body (1)；

Inner barrel (2) is the hollow cylinder that side carries opening, and axial slide, inner cylinder are provided with the inside of the barrel of inner barrel (2) Body (2) trough width is consistent with outer cylinder body (1) trough width, and inner barrel (2) track length is more than outer cylinder body (1) track length； Inner barrel (2) is installed in outer cylinder body (1), and inner barrel (2) chute is corresponding with the position of outer cylinder body (1) chute, and inner barrel (2) opening direction is consistent with the opening direction of outer cylinder body (1)；On the outside of the barrel of inner barrel (2) and in the barrel of outer cylinder body (1) Side clearance coordinates, and inner barrel (2) can move reciprocatingly in the axial direction of outer cylinder body (1) interior edge outer cylinder body (1)；

The inside of inner barrel (2) is axially placed with compression spring (3)；

Pressing plate (5) is arranged on the inside of inner barrel (2), and an end face of pressing plate (5) is pressed in compression spring (3), pressing plate (5) Side and the barrel medial gap of inner barrel (2) coordinate, and pressing plate (5) can be done in the axial direction of inner barrel (2) interior edge inner barrel (2) Move back and forth；

It is fixedly installed limited block one (4A) on the periphery of pressing plate (5), limited block one (4A) while stretches into outer cylinder body (1), interior In the chute of cylinder (2), limited block one (4A) is done in the axial direction of outer cylinder body (1), the chute interior edge inner barrel (2) of inner barrel (2) Move back and forth；

Piston (6) is arranged on the inside of inner barrel (2), and an end face of piston (6) is pressed on another end face of pressing plate (5), The barrel medial gap of piston (6) and inner barrel (2) coordinates, and piston (6) can be in the axle of inner barrel (2) interior edge inner barrel (2) To moving reciprocatingly；

Limited block two (4B) is fixedly installed on the inside of inner barrel (2) barrel and close to the position of opening；Limited block two (4B) is with living Another end face of plug (6) fits；

By piston (6) to inner barrel (2) bottom promote when, piston (6) promote pressing plate (5), and then cause compression spring (3) enter one Step compression；

By piston (6) to inner barrel (2) opening direction pull when, piston (6) by limited block two (4B) pull inner barrel (2) to The opening direction motion of outer cylinder body (1), limited block one (4A) limitation pressing plate (5) move to the opening direction of outer cylinder body (1), and then So that compression spring (3) is further compressed.

A kind of 2. bidirectional spring pre-tightening mechanism according to claim 1, it is characterised in that the axial direction of the outer cylinder body (1) Chute is U-shaped chute.

A kind of 3. bidirectional spring pre-tightening mechanism according to claim 1 or 2, it is characterised in that the axle of the inner barrel (2) It is U-shaped chute to chute.

A kind of 4. bidirectional spring pre-tightening mechanism according to claim 1 or 2, it is characterised in that the outer cylinder body (1) and interior The axial slide of cylinder (2) is 2.

A kind of 5. bidirectional spring pre-tightening mechanism according to claim 1 or 2, it is characterised in that：The limited block one (4A), Limited block two (4B) is pin or screw.