CN110173183B

CN110173183B - Air damper and automobile door applying same

Info

Publication number: CN110173183B
Application number: CN201910160060.2A
Authority: CN
Inventors: 左言言; 孙瑞; 曾发林
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2019-03-04
Filing date: 2019-03-04
Publication date: 2021-01-15
Anticipated expiration: 2039-03-04
Also published as: CN110173183A

Abstract

The invention discloses an air damper and an automobile door applying the same, and the air damper comprises a damping cylinder, wherein two ends of the damping cylinder are respectively provided with an end cover, the end covers are provided with throttling holes, the middle section of the side wall of the damping cylinder is provided with a straight groove, a piston is arranged in the damping cylinder and comprises 2 piston bodies, the piston bodies are connected through a piston rod, the middle position of the piston rod is provided with a connecting rod, and the connecting rod extends out of the damping cylinder from the straight groove; the air damper is characterized in that the piston body is provided with a plurality of through holes for installing the circulation valve plug, a diaphragm spring is further arranged between the circulation valve plug and the piston body, the air damper is installed on a door frame of the vehicle door and is connected with an action mechanism on the vehicle door, and impact noise in the opening and closing process of the vehicle door can be effectively reduced.

Description

Air damper and automobile door applying same

Technical Field

The invention belongs to the technical field of vehicle vibration reduction and noise reduction, and particularly relates to an air damper and an automobile door applying the same.

Background

With the rapid development of the modern automobile industry and the improvement of the living standard of people, people put forward higher and higher requirements on automobiles, and the vibration noise performance of the automobiles receives more attention. The existing bus door is not damped in the opening and closing processes, so that the speed is not attenuated in the door opening and closing processes, large impact is formed at the end of a stroke, large impact noise is generated, the riding comfort is seriously influenced, and meanwhile, the abrasion of the parts of the bus door is also increased.

The process of opening and closing the vehicle door can be divided into two stages. The first stage is as follows: in the previous large-section stroke of opening and closing of the vehicle door, the motion resistance of the vehicle door is small, the opening and closing actions are rapid, and the rapid movement of the vehicle door is realized; and a second stage: during the course of the door opening and closing near the end, the speed is gradually reduced to zero to reduce the impact between the door and the door frame.

Disclosure of Invention

The invention provides an air damper and an automobile door applying the same according to the problems in the prior art, and aims to provide the air damper capable of effectively reducing impact noise.

The technical scheme adopted by the invention is as follows:

an air damper comprises a damping cylinder, wherein end covers are respectively arranged at two ends of the damping cylinder, a throttling hole is formed in each end cover, a straight groove is formed in the middle section of the side wall of the damping cylinder, a piston is arranged in the damping cylinder and comprises 2 piston bodies, the piston bodies are connected through piston rods, a connecting rod is arranged in the middle of each piston rod, and the connecting rod extends out of the damping cylinder from the straight groove; the piston body is provided with a plurality of through holes for installing the circulation valve plug, and a diaphragm spring is further arranged between the circulation valve plug and the piston body.

Further, the piston body is of a cup-shaped structure with one open end; the outer side of the piston body is provided with a sealing ring for keeping the air tightness with the inner wall of the damping cylinder;

further, the value range of the opening gap of the sealing ring as Δ t is as follows: 1mm < Δ t <2 mm;

further, the end cover is connected with the damping cylinder through a screw, and a sealing gasket is arranged between the end cover and the damping cylinder;

further, the limit distance between the connecting rod and the two ends of the straight groove is L4, 5mm < L4<8 mm;

further, the distance from the end of the straight groove to the end cap is L3, 0.2 × L1< L3<0.25 × L1, wherein L1 is the total length of the damping cylinder.

An air damper is mounted on a door frame of an automobile and connected with an actuating mechanism on the door, so that impact noise when the door is closed can be effectively reduced.

Further, the air damper has a straight groove length of L5, and L5 is the door operating mechanism stroke +2 × L4.

Further, the total length of the damping cylinder is L1, and L1 ═ L5+2 × L3.

The invention has the beneficial effects that:

the invention utilizes the compressibility of air to gradually increase the motion damping of the automobile door in a section of stroke of opening or closing the automobile door close to the tail, so that the opening and closing of the automobile door are more stable, and in the previous large section of stroke of opening and closing the automobile door, the inside of the damping cylinder is communicated with the outside of the damping cylinder through the small throttling hole, the circulation hole and the straight groove, so that the motion resistance of the automobile door is very small, and the quick action of opening and closing the automobile door is realized.

The air damper can be directly installed at a proper position of a door frame and connected with a door actuating mechanism through a connecting rod, can also be applied to other similar structures, and is wide in application.

Drawings

FIG. 1 is a schematic view of the position of the various components of an automotive door air damper of the present invention in a closed door condition;

FIG. 2 is a schematic view of the position of the various components of an automotive door air damper of the present invention during the door opening cushioning stroke;

FIG. 3 is a schematic view of the position of the various components of an automotive door air damper of the present invention with the door open;

FIG. 4 is a cross-sectional view of an automotive door air damper piston of the present invention;

FIG. 5 is a front view of an automotive door air damper seal ring of the present invention;

FIG. 6 is a top view of an automotive door air damper seal ring of the present invention;

FIG. 7 is a side view of an automotive door air damper end cap in accordance with the present invention;

in the figure, 1, a damping cylinder, 2, a sealing ring, 3, a piston rod, 4, a connecting rod, 5, a straight groove, 6, a piston body, 7, a diaphragm spring, 8, a flow valve plug, 9, a small throttling hole, 10, a flow hole, 11, an inner hexagonal cylindrical head screw, 12, an end cover, 13, a sealing gasket, L1, the total length of the damping cylinder, L2, the distance between the opening end surfaces of the two pistons, L3, the distance between the two ends of the straight groove and the two end surfaces of the damping cylinder, and L4, when a vehicle door is in a closed state and the piston is at the leftmost stroke, the distance between the leftmost side of the connecting rod and the left end of the straight groove; l5, length of straight slot, cavity on left side I, cavity on right side II, cavity between two pistons III.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 and 7, the air damper provided by the invention comprises a damping cylinder 1, wherein the damping cylinder 1 is a cylindrical structure with two open ends, the total length of the damping cylinder 1 is L1, the two ends of the damping cylinder 1 are symmetrical structures, the two ends of the damping cylinder 1 are respectively provided with an end cover 12, the damping cylinder 1 is connected with the end cover 1 through an inner hexagonal cylindrical head screw 11, as shown in fig. 5 and 6, a sealing gasket 13 is arranged between the end cover 12 and the damping cylinder 1, the middle part of the end cover 12 is provided with a small throttling hole 9, the small throttling hole 9 is communicated with the inside and the outside of the damping cylinder 1, and when a piston enters a buffering stroke, the small throttling hole plays a throttling buffering; a straight groove 5 is formed in the middle section of the side wall of the damper cylinder 1, the straight groove 5 is provided in the middle position of the damper cylinder 1, and the distances between the end parts of the straight groove 5 and the end faces of the damper cylinder 1 are respectively L3.

A piston is arranged in the damping cylinder 1, the piston is of a left-right symmetrical structure as shown in figures 1 and 4, the piston comprises 2 piston bodies 6, the piston bodies 6 are of a cup-shaped structure with one open end, and the openings of the piston bodies face the end parts of the damping cylinder 1 respectively; a plurality of through holes are formed in the piston body 6 and used for installing a circulation valve plug 8, and a diaphragm spring 7 is arranged between the circulation valve plug 8 and the piston body 6; the 2 piston bodies 6 are connected through the piston rod 3, the connecting rod 4 is arranged in the middle of the piston rod 3, an external thread is machined at one end of the connecting rod 4 and can penetrate through the straight groove 5, a threaded hole in the middle of the screwed piston rod 3 is connected with the piston rod 3, the other end of the threaded hole is connected with the vehicle door action mechanism, and the connecting rod 4 extends out of the damping cylinder 1 through the straight groove 5. The total length of the damping cylinder 1 is L1, the distance between the two open end surfaces of the piston is L2, the length of the straight groove 5 is L5, the distance between the two ends of the straight groove and the two end surfaces of the damping cylinder is L3 respectively, when the damper of the invention is applied to a vehicle door structure, the relationship of the sizes of all parts is as follows: when the vehicle door is in a closed state and the piston is at the leftmost end of the stroke, the distance between the leftmost side of the connecting rod 4 and the left end of the straight groove 5 is L4, the

sealing rings

2 and 11 and the opening gap is delta t, and the relations are respectively satisfied: l2 ═ 2 × L3, L5 ═ door actuator travel +2 × L4, 5mm < L4<8mm, 0.2 × L1< L3<0.25 × L1, total length L1 ═ L5+2 × L3, and 1mm < Δ t <2 mm.

In order to explain the structure protected by the present invention more clearly, the opening of the vehicle door is taken as an example below. The door opening process can be divided into the following steps:

1. the closed state of the vehicle door is as follows: as shown in figure 1, the vehicle door is closed, the piston is in the state of the leftmost end of the stroke, at the moment, the distance between the leftmost side of the connecting rod 4 and the left end of the straight groove 5 is L4, the circulating valve is in the open state, and the cavity I and the cavity II are respectively communicated with the outside of the damping cylinder through the small throttling hole, the small circulating hole and the straight groove 5.

2. The vehicle door starts to move: the car door is opened, the connecting rod 4 moves rightwards along with the car door and drives the piston rod 3, the piston is made to move rightwards, the pressure difference between the cavity I and the cavity III is small at the moment, the pressure difference between the cavity II and the cavity III is also small, all the circulation valves still keep an opening state, the cavity I is communicated with the outside of the damping cylinder through the throttling small hole 9 on the left side, the circulation hole 10 on the left side and the straight groove 5 on the left side, the cavity II is communicated with the outside of the damping cylinder through the throttling small hole 9 on the right side and the straight groove 5 on the right side, air has no damping effect at the moment, and the process.

3. Buffering stroke: when the right sealing ring 2 moves to the right end of the straight groove 5, as shown in fig. 2, due to the compressibility of air, the air pressure in the cavity II is gradually increased, a certain pressure difference is generated between the cavity II and the cavity III, the diaphragm spring 7 is compressed, the circulation valve 8 is closed, the air in the cavity II is communicated with the air outside the cylinder only through the throttling small hole 9, the throttling small hole 9 plays a throttling role, the air in the cavity II generates a damping effect on the piston, the moving speed of the piston is gradually reduced, the air pressure in the cavity II reaches dynamic balance after a section of stroke, and the buffering stroke is finished until the vehicle door is completely opened. The process is a buffer stroke for opening the vehicle door, so that the vehicle door is stably opened, and the impact of the vehicle door, a door frame and other parts is reduced.

4. The opening state of the vehicle door is as follows: as shown in figure 3, the vehicle door is completely opened, the piston is positioned at the rightmost end of the stroke, the distance between the rightmost edge of the connecting rod 4 and the right end of the straight groove 5 is L4, the cavity II is communicated with the outside of the damping cylinder through the small throttling hole 9, the air pressure in the cavity II is continuously reduced, when the air pressure is reduced to a certain value, the diaphragm spring 7 on the right side is relaxed, the flow valve on the right side is opened, and the cavity II is communicated with the outside of the damping cylinder through the small throttling hole 9, the flow hole 10 and the straight groove 5.

The closing process of the vehicle door is similar to the opening process of the vehicle door, the resistance is very small in the previous large-section stroke of closing the vehicle door, and the motion damping of the vehicle door is gradually increased by utilizing the compressibility of air in a section of stroke close to the tail end, so that the closing speed of the vehicle door is gradually reduced, and the vehicle door is stably closed.

The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.

Claims

1. The air damper is characterized by comprising a damping cylinder (1), wherein end covers (12) are respectively arranged at two ends of the damping cylinder (1), a throttling hole (9) is formed in each end cover (12), a straight groove (5) is formed in the middle section of the side wall of the damping cylinder (1), a piston is arranged inside the damping cylinder (1) and comprises 2 piston bodies (6), the piston bodies (6) are connected through piston rods (3), a connecting rod (4) is arranged in the middle of each piston rod (3), and the connecting rod (4) extends out of the damping cylinder (1) through the straight groove (5); the piston body (6) is provided with a plurality of through holes for installing the circulation valve plug (8), and a diaphragm spring (7) is further arranged between the circulation valve plug (8) and the piston body (6).

2. An air damper according to claim 1, characterized in that the piston body (6) is a cup-shaped structure with one open end; and the outer side of the piston body (6) is provided with a sealing ring (2) for keeping the air tightness with the inner wall of the damping cylinder (1).

3. An air damper according to claim 2, characterized in that the opening gap Δ t of the sealing ring (2) is of the value range: 1mm < Δ t <2 mm.

4. An air damper according to claim 1, characterized in that the end cap (12) is connected to the damping cylinder (1) by means of screws (11), and a sealing gasket (13) is provided between the end cap (12) and the damping cylinder (1).

5. An air damper according to claim 1, characterized in that the extreme distance of the connecting rod (4) from the ends of the straight slot (5) is L4, 5mm < L4<8 mm.

6. An air damper according to claim 1, characterized in that the distance from the end of the straight slot (5) to the end cap (12) is L3, and the total length of the damper cylinder (1) is L1, 0.2 x L1< L3<0.25 x L1.

7. A vehicle door provided with an air damper as claimed in any one of claims 1 to 6, wherein the air damper is mounted to a door frame and is connected to an actuator on the door.

8. The vehicle door according to claim 7, wherein the length of the straight slot (5) of the air damper is L5, L5 is the door operating mechanism stroke + 2L 4, and L4 is the limit distance between the connecting rod (4) and the two ends of the straight slot (5) in the air damper.

9. An automobile door according to claim 8, characterized in that the total length of the damping cylinder (1) is L1, and L1-L5 + 2-L3, L3 being the distance from the end of the straight slot (5) in the air damper to the end cap (12).