Air spring bag skin structure and production auxiliary tool thereof

Abstract

The utility model discloses an air spring bag skin structure and a production assistive device thereof, the air spring bag skin structure is a hollow columnar structure and is composed of a cord thread layer and a rubber layer for clamping the cord thread layer, the cord thread layer is composed of single-layer nylon threads, the distances between the nylon threads are close or the same, and all the nylon threads are spirally arranged in the same direction. The air spring bag skin structure is of a hollow columnar structure formed by an inner rubber layer, a cord thread layer and an outer rubber layer in sequence from inside to outside, the cord thread layer is composed of an inner layer solid body and a nylon cord thread layer wound on the surface of the inner layer solid body, and a plurality of nylon threads are spirally and evenly distributed on the surface of the inner layer solid body. According to the utility model, cord fabric with warps and wefts is not adopted, and the cord is directly and uniformly wound in the forming process of the bag skin, so that heat generated by cross friction of the warps and the wefts is structurally avoided. And the life and hysteresis performance of the capsule skin are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive shock absorption, and particularly to an air spring bladder structure for vehicles. Background Art

[0002] With the development of the automotive industry, people have higher and higher requirements for the ride comfort and functionality of vehicles. Air springs are more and more widely used in vehicles. As one of the key functional components in air springs, the bladder works by moving up and down along the fold line between the protective cylinder and the piston during the inflation and deflation process, so as to change the volume of the bladder envelope and realize the function of the air spring.

[0003] The existing air spring bladders are of single-layer axial spiral cord type or double-layer cross spiral cord type. For example, in the published document with the publication number CN117052821A, the publication date of November 14, 2023, and the patent name "Air Spring Bladder", the disclosed air spring bladder includes an inner rubber layer, an axial straight cord layer, a radial curved cord layer and an outer rubber layer. The inner rubber layer is located on the innermost side of the bladder, the outer rubber layer is located on the outermost side of the bladder, the axial straight cord layer and the radial curved cord layer are located between the inner rubber layer and the outer rubber layer, and the axial straight cord layer is located inside or outside the radial curved cord layer.

[0004] Since the cord structure has warp and weft, whether it is a single-layer axial spiral cord bladder or a double-layer cross spiral cord bladder, during the bending movement process, as the diameter of the bladder changes, friction will occur between the warp and weft, generating heat, increasing the temperature of the bladder. As the service time increases, this temperature will accelerate the aging of the bladder, affecting its service life and reducing its hysteresis performance, and further affecting the life and response time of the vehicle suspension, and ultimately affecting the comfort and functionality of the vehicle.

[0005] Generally speaking, the currently common air spring bladder structures have the following problems:

[0006] 1. The cord structure adopted on the current bladder has warp and weft. During the production process, the cords are distributed axially in a spiral manner. During the working process of the bladder, due to the change in the volume enclosed by the bladder, the piston and related components, relative displacement occurs near the intersection of the warp and weft, resulting in friction between the warp and weft, generating heat, rising the temperature of the surrounding rubber, and further aging the surrounding rubber, affecting its fatigue life and reducing the hysteresis performance of the bladder;

[0007] 2. The cord structure adopted on the current bladder has warp and weft, and there must be a dimensional superposition in the thickness direction at the intersection of the warp and weft, resulting in variation in the thickness of the bladder and uneven thickness, and further resulting in inconsistent dynamic hysteresis performance during the movement of the bladder;

[0008] 3. The spiral axial winding of the cord fabric currently used on the bladder necessarily results in lapping, which causes the thickness of the lapping part to be one cord fabric thickness thicker than that of the non-lapping part, also leads to thickness variation and uneven thickness, and further reduces the dynamic hysteresis performance during the movement of the bladder.

[0009] 4. The cord fabric currently used on the bladder needs to be cut into a suitable width before production. During the cutting process, the warp may be cut off, resulting in the cord ropes on both sides of the cord fabric width not being a whole piece, which in turn affects the strength of the bladder. Utility Model Content

[0010] The technical problem to be solved by this utility model is to realize a brand-new air spring bladder structure. Instead of using cord fabric with warp and weft, a structure of evenly winding cord ropes directly during the bladder forming process is adopted, so as to avoid the heat generated by the cross-friction of the warp and weft in terms of structure, and improve the life and hysteresis performance of the bladder.

[0011] To achieve the above purpose, the technical solution adopted by this utility model is: an air spring bladder structure, the air spring bladder structure is a hollow columnar structure, composed of a cord layer and a rubber layer clamping the cord layer. The cord layer is composed of a single layer of nylon threads, the spacing between the nylon threads is similar or the same, and all the nylon threads are arranged in the same direction in a spiral manner.

[0012] The cord layer is provided with a single layer; or, the cord layer is provided with multiple layers, and the spiral directions of the nylon threads in adjacent two cord layers are opposite, and adjacent cord layers share a rubber layer.

[0013] Both ends of each cord layer are provided with circular weft nylon threads.

[0014] The rubber layer is a rubber layer composed of an oil-resistant and airtight material. An outer protective layer is provided on the inner surface and / or outer surface of the air spring bladder structure, and the outer protective layer is a rubber layer composed of a wear-resistant and corrosion-resistant material.

[0015] The air spring bladder is the bladder of a vehicle air spring.

[0016] A production auxiliary tool for producing an air spring bladder structure, including a movable wire harness board, a fixed wire harness board and a support column. The support column is vertically fixed on the fixed wire harness board. The movable wire harness board and the fixed wire harness board are provided with wire holes for nylon threads to pass through at equal intervals around the perimeter. A hole for the support column and the rubber layer to pass through is provided in the center of the movable wire harness board. The movable wire harness board is provided with a plurality of nylon threads respectively used for installing different outer diameter distribution areas.

[0017] An annular clamping plate for clamping the head of a nylon wire is provided on the movable wire harness board. A locking mechanism is provided between the annular clamping plate and the movable wire harness board. The movable wire harness board is connected to a rotary telescopic mechanism through a connecting rod. The rotary direction of the rotary telescopic mechanism is coaxial with the axis of the support column, and the telescopic direction is parallel to the axis of the support column.

[0018] The wire holes of the fixed wire harness board are waist-shaped holes or groove-shaped structures that are open radially outward along the fixed wire harness board.

[0019] The air spring bladder structure of the present utility model has the following advantages:

[0020] 1. The structure of directly axially helically winding the cord is adopted, which avoids the intersection of warp and weft lines structurally, and there will be no mutual friction to generate heat, resulting in rubber aging, improving the fatigue life of the rubber and the hysteresis performance of the system;

[0021] 2. The structure of directly axially helically winding the cord is adopted, which avoids the variation of the bladder thickness caused by the superposition of the intersection point sizes of the warp and weft lines structurally, improving the flexural uniformity of the bladder and the hysteresis performance of the system;

[0022] 3. The structure of directly axially helically winding the cord is adopted, which avoids the variation of the bladder thickness caused by the lap of the cord fabric in the wide width structurally, improving the flexural uniformity of the bladder and the hysteresis performance of the system;

[0023] 4. The process of directly axially helically winding the cord is adopted, which greatly improves the utilization rate and storage period of the cord, reduces the production cost and carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following briefly describes the content expressed in each drawing in the specification of the present utility model and the marks in the drawings:

[0025] Figure 1 It is a schematic diagram of the single-layer structure of the air spring bladder;

[0026] Figure 2 It is a schematic diagram of the wire harness board structure;

[0027] Figure 3 It is a schematic diagram of the production of the air spring bladder;

[0028] The marks in the above figures are all: 1. Rubber layer; 2. Cord layer; 3. Movable wire harness board; 4. Fixed wire harness board; 5. Wire hole. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following will make a further detailed description of the specific implementation manner of the present utility model, such as the shapes, structures, mutual positions and connection relationships between various parts, the functions and working principles of each part, the manufacturing process, and the operation and usage methods, etc., with reference to the attached drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present utility model.

[0030] As Figure 1 shown, the air spring bladder structure as a whole is composed of two rubber layers 1 sandwiching a cord layer 2, and is in an overall hollow columnar structure. The rubber layer is a rubber layer 1 made of oil-resistant and airtight materials. In order to protect the air spring bladder structure, an outer protective layer can be provided on the inner surface or the outer surface of the air spring bladder structure, or a layer of outer protective layer can be provided on both the inner surface and the outer surface of the air spring bladder structure at the same time. The outer protective layer is a rubber layer 1 made of wear-resistant and corrosion-resistant materials. The formed air spring bladder structure can be the bladder used in vehicle air springs.

[0031] The cord layer 2 in the air spring bladder can be provided with multiple layers or only one layer. If a single-layer structure is adopted, the cord layer 2 is clamped by the two-side rubber layers 1. The cord layer 2 is a spiral-wound nylon thread. If a form of multiple cord layers 2 is adopted, a rubber layer 1 for spacing is provided between adjacent cord layers 2. The rubber layer 1 is used to space different cord layers 2 so that all cord layers 2 do not contact each other, and the nylon threads of the same cord layer 2 do not contact each other either. The spiral directions of the nylon threads of adjacent two cord layers 2 are opposite.

[0032] The cord layer 2 is composed of multiple nylon threads with uniform spiral distribution. The rotation radian of the nylon thread is specifically adjusted according to actual applications. The spacing between each nylon thread of the same cord layer 2 is the same or close. Circular weft nylon threads are provided at both ends of each cord layer 2 to ensure the forming effect and the crimping process. The structure of directly axially spirally winding the cords is adopted, which structurally avoids the variation of the bladder thickness caused by the superposition of the sizes of the intersection points of the warp and weft threads, improves the flexural uniformity of the bladder and the hysteresis performance of the system. And the structure of directly axially spirally winding the cords is adopted, which structurally avoids the variation of the bladder thickness caused by the lap of the cord fabric in the wide width, improves the flexural uniformity of the bladder and the hysteresis performance of the system.

[0033] The production auxiliary tools for producing the air spring bladder structure include a movable wire harness plate 3, a fixed wire harness plate 4 and a support column. The movable wire harness plate 3 and the fixed wire harness plate 4 are circular plates. One end of the support column is fixedly connected to the fixed wire harness plate 4 and the support column is coaxial with the fixed wire harness plate 4. The length of the support column is the length of the air spring bladder structure to be produced, and the outer diameter of the support column is the inner diameter of the air spring bladder structure to be produced. The movable wire harness plate 3 and the fixed wire harness plate 4 are provided with wire holes 5 for nylon threads to pass through at equal intervals around the periphery.

[0034] The number of wire holes 5 on the movable wire harness board 3 and the fixed wire harness board 4 is the same. The wire holes 5 on the movable wire harness board 3 and the fixed wire harness board 4 are arranged at equal angles. There are multiple movable wire harness boards 3, which are components that need to be replaced and used. Because after pasting multiple layers of film, the inner diameter position of the cord layer 2 needs to be adjusted, and because the outer diameter of the film increases, the central hole of the movable wire harness board 3 also needs to be gradually increased to ensure that the coiled cylindrical film can pass through the hole. Therefore, the wire hole circle (the circle formed by the centers of the wire holes 5) formed by the wire holes 5 on the movable wire harness board 3 will change due to the outer diameter size of the installed cord layer 2. The aperture of the wire hole 5 itself and the angle between the wire holes 5 remain unchanged. The wire hole circles of multiple movable wire harness boards 3 increase or decrease with the size of the processed cord layer 2. In this way, multiple movable wire harness boards 3 can be cooperatively used to install nylon wires in different outer diameter regions (the size of the wire hole circle).

[0035] The wire holes 5 of the fixed wire harness board 4 are waist-shaped holes or groove-shaped structures that open radially outward along the fixed wire harness board 4. In this way, there is no need to prepare multiple fixed wire harness boards 4. Just fix it on the tooling. The position of the nylon wire is controlled by the movable wire harness board 3. Generally, the fixed wire harness board 4 is fixed horizontally, and the central support column is perpendicular upward. The movable wire harness board 3 moves up and down along the support column. Below the fixed wire harness board 4, there needs to be a wire dispenser with the same number of wire holes 5. Each wire dispenser winds a strand of nylon wire, and the wire dispensers are also arranged at equal angles like the wire holes 5.

[0036] The movable wire harness board 3 needs to move upward with the nylon wire head. Therefore, an annular clamping plate for clamping the nylon wire head is provided on the movable wire harness board 3. The clamping plate is a device that cooperates with the movable wire harness board 3 to clamp the wire head and needs to have a certain anti-slip function. Therefore, a rubber ring is preferably used. A locking mechanism is provided between the movable wire harness board 3 and the annular clamping plate. The locking mechanism is used to press the annular clamping plate and the movable wire harness board 3 to clamp the wire head, or it can be loosened to make the annular clamping plate and the movable wire harness board 3 have a gap, which is convenient for the wire to pass between the annular clamping plate and the movable wire harness board 3 to be clamped. The locking mechanism can adopt an existing lever-type clamping mechanism. The working movable wire harness board 3 is connected to the rotary telescopic mechanism through a connecting rod. The rotation direction of the rotary telescopic mechanism is coaxial with the axis of the support column, and the telescopic direction is parallel to the axis of the support column, realizing the up and down movement and rotary movement of the movable wire harness board 3. In order to avoid interference with the film and the support column, it can be fixed by the way of detachably connecting multiple connecting rods to the edge of the movable wire harness board 3. The rotary telescopic mechanism can be realized by connecting the output end of a stepping motor to the connecting rod and then fixing the stepping motor on the electric cylinder that moves up and down.

[0037] Combined with the above-mentioned auxiliary tools, the production method of the air spring bladder structure is that the cord is wound on the inner layer entity through the relatively uniform rotation of two or more wiring devices during the bladder forming process. If there are multiple layers of cord, the cord is wound continuously in sequence by a corresponding number of wiring device groups. Interlayer glue is wound between the wiring device groups. The wiring device is uniformly driven by a motor, and the spacing between two adjacent wires is controlled to be uniform by controlling the angular velocity.

[0038] Specifically, it includes air spring bladder skin preparation and air spring bladder skin vulcanization, wherein the air spring bladder skin preparation includes the following steps:

[0039] 1) Wrap a layer of adhesive layer 1 around the support column. The surface of the adhesive layer 1 is self-adhesive, so it only needs to be cut to a suitable size and wrapped around the support column to fix it;

[0040] 2) Select an active harness plate 3 with a suitable size of 5 turns of wire holes, generally the smallest one (the active harness plate 3 with the smallest 5 turns of wire holes). The 5 turns of wire holes of the active harness plate 3 are slightly larger than the outer diameter of the rubber layer 1 on the current support column. Fix the active harness plate 3 to the connecting rod of the rotating and telescopic mechanism and tighten it;

[0041] 3) The movable harness plate 3 is lowered to the bottom, and the movable harness plate 3 and the fixed harness plate 4 are brought into contact or close to each other. Multiple nylon wires are passed through the wire holes 5 corresponding to the movable harness plate 3 and the fixed harness plate 4 in sequence, and then the ends of each nylon wire are clamped with the annular clamp. In order to reliably fix the ends of the nylon wires before clamping them, glue is applied or weft is wound on the outer side of the movable harness plate 3 to fix the ends of the nylon wires before clamping them. After the annular clamp clamps the ends of the nylon wires, each nylon wire is tightened to the set tension value, and the preparation work for setting the cord layer 2 is completed;

[0042] 4) According to the set wire pulling speed, rotation direction and rotation speed, the movable wire harness plate 3 is controlled to be away from the fixed wire harness plate 4, so that the nylon wire is spirally adhered to the surface of the adhesive layer 1. The nylon wire will rotate upward and shrink slightly, and will be affected by the adhesive layer 1 and adhere to the adhesive layer 1 in a spiral shape;

[0043] 5) Wrap a layer of adhesive layer 1 around the upper adhesive layer 1, and at this time, the upper layer of nylon wire can be reliably fixed and clamped between the two adhesive layers 1;

[0044] 6) Is the preparation of the air spring bladder skin completed? If not, in range 2), select a larger active wiring harness plate 3. If yes, vulcanize the air spring bladder skin to complete the preparation of the air spring bladder skin structure.

[0045] The present utility model has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model, or the concept and technical solution of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. An air spring bladder structure, the air spring bladder structure is a hollow columnar structure, composed of a cord layer and a rubber layer clamping the cord layer, and is characterized in that: The cord layer is composed of a single layer of nylon cords, and the spaces between the nylon cords are similar or the same, and all the nylon cords are arranged in the same direction in a spiral manner.

2. The air spring bladder structure according to claim 1, characterized in that: The cord layer has a single layer; or, the cord layer has multiple layers, and the spiral directions of the nylon cords in adjacent two cord layers are opposite, and a rubber layer is shared between adjacent cord layers.

3. The air spring bladder structure according to claim 2, characterized in that: Circular weft nylon cords are provided at both ends of each cord layer.

4. The air spring bellows structure according to claim 3, wherein: The rubber layer is made of an oil-resistant and airtight material, and an outer protective layer is provided on the inner surface and / or the outer surface of the air spring bladder structure, and the outer protective layer is made of a wear-resistant and corrosion-resistant material.

5. The air spring bellows structure according to any one of claims 1-4, characterized in that: The air spring bladder is the bladder of a vehicle air spring.

6. An auxiliary production tool for producing an air spring bladder structure as described in any one of claims 1-5, characterized in that: It includes a movable wire harness board, a fixed wire harness board and a support column. The support column is vertically fixed on the fixed wire harness board. Wire holes for nylon cords to pass through are equidistantly provided around the movable wire harness board and the fixed wire harness board. A hole for the support column and the rubber layer to pass through is provided at the center of the movable wire harness board. The movable wire harness board is provided with a plurality of nylon cords respectively for installing different outer diameter distribution areas.

7. The production auxiliary tool for the air spring bladder structure according to claim 6, characterized in that: An annular clamping plate for clamping the ends of the nylon cords is provided on the movable wire harness board. A locking mechanism is provided between the annular clamping plate and the movable wire harness board. The movable wire harness board is connected to a rotary telescopic mechanism through a connecting rod. The rotation direction of the rotary telescopic mechanism is coaxial with the axis of the support column, and the telescopic direction is parallel to the axis of the support column.

8. The production auxiliary tool for the air spring bladder structure according to claim 7, characterized in that: The wire holes of the fixed wire harness board are kidney-shaped holes or groove-shaped structures that are open radially outward along the fixed wire harness board.

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