An inflation assembly for an air spring

Abstract

The present invention discloses an inflation assembly for an air spring, which includes a pressure maintaining valve, an inflation head with an inflation pin, and a limit insert. The feature is that the valve body of the pressure maintaining valve has an outwardly convex limit portion, which divides the valve body into an air intake section with an air intake passage and an air spring air chamber connection section with an air outlet passage for sealing installation with the air chamber interface of the air spring; the inflation head includes a positioning cylinder body, the inflation pin is arranged in the positioning cylinder body, the inflation pin includes a main body portion and an insertion portion, and an insertion space is formed between the insertion portion and the positioning cylinder body; the two opposite ends of the limit insert are respectively a connection end and a limit insertion end, the connection end is connected to the positioning cylinder body through a pull rope, and the limit insertion end has a plugging groove with a side opening, and the plugging groove divides the limit insertion end into two limit arms. The advantages are that the structure is simple, the stable installation and use of the inflation head of this structure and the pressure maintaining valve can be effectively realized, and the disassembly and assembly of the inflation head are relatively quick and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of air spring manufacturing, and more particularly to an inflation assembly for an air spring. Background Art

[0002] An air spring is a spring that fills compressed air in a telescopic sealed container and utilizes the elastic effect of air. The air spring has a light weight and small internal friction, and exhibits excellent vibration isolation and noise reduction performance in a high-frequency vibration environment. At the same time, the air spring can achieve an ideal variable stiffness characteristic by adjusting the internal pressure: when the load increases, the gas in the sealed container is compressed, the air pressure rises, thereby enhancing the stiffness of the spring; conversely, when the load decreases, the air pressure drops, and the spring stiffness also decreases accordingly. This variable stiffness characteristic enables the air spring to maintain the stability of the natural frequency of the vehicle body when applied to an automotive suspension, and thus is not affected by load changes. Therefore, the air spring has been widely used as an important component in modern automotive suspension systems.

[0003] During the manufacturing process of an air spring, the inflation operation is a crucial step, which has a direct impact on the working performance of the air spring and the overall quality of its application to an automobile. Currently, the inflation assembly for an air spring mainly includes a pressure maintaining valve and an inflation head with an inflation needle. The pressure maintaining valve is fixedly installed on the inflation port of the product as a component of the air spring. The inflation head is connected to an external air supply device. By inserting the inflation needle into the inside of the pressure maintaining valve, the valve core of the pressure maintaining valve is opened for inflation operation. Then, to ensure a stable inflation operation, it is necessary to ensure that the inflation needle can be stably inserted and installed on the pressure maintaining valve. Therefore, the inflation head must also be clamped on the pressure maintaining valve. However, based on the existing structure of the inflation head, for different installation positions of the pressure maintaining valves of different air springs, as well as different structures and shapes of the pressure maintaining valves used in different air springs, there are problems such as inconvenient operation, unstable clamping, and low replacement efficiency. Especially for air springs with the pressure maintaining valve located in the upper front or upper side of the product, due to the special position of the inflation port, the traditional inflation head is prone to slipping or shifting during the clamping process, resulting in poor inflation effect or even potential safety hazards; in addition, the existing structure of the inflation head is relatively complex, the operation is cumbersome, and it is difficult to achieve rapid disassembly and assembly, which has a certain impact on the manufacturing efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an inflation assembly for an air spring with a simple structure, stable use, and capable of achieving quick disassembly and assembly, which can be adapted to air springs with the pressure maintaining valve located in the upper front or upper side of the product.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0006] An inflation assembly for an air spring, comprising a pressure maintaining valve and an inflation head with an inflation pin. The valve body of the pressure maintaining valve has an outwardly protruding limiting portion, which divides the valve body into an intake section with an intake passage and an air spring air chamber connection section with an outlet passage for sealing installation with the air chamber interface of the air spring;

[0007] The inflation head includes a positioning cylinder body. The inflation pin is arranged in the positioning cylinder body. The inflation pin includes a main body portion and an insertion portion. An insertion space for the intake section to extend into and be installed is formed between the insertion portion and the positioning cylinder body;

[0008] It further includes a limiting insertion piece. The two opposite ends of the limiting insertion piece are respectively a connection end and a limiting insertion end. The connection end is connected to the positioning cylinder body through a pull rope. The limiting insertion end has a plugging groove with a side opening, and the plugging groove divides the limiting insertion end into two limiting arms;

[0009] During inflation use, the intake section extends into and is arranged in the positioning cylinder body. The insertion portion is tightly and sealingly inserted into the intake passage. The upper part of the air spring air chamber connection section is inserted into the plugging groove, so that the limiting arms are limitedly arranged below the outwardly protruding limiting portion.

[0010] The positioning cylinder body includes a main cylinder body and an extending cylinder body arranged in sequence along the axial direction. The main body portion is arranged in the main cylinder body, and the insertion portion is arranged in the extending cylinder body. The insertion space is formed between the insertion portion and the extending cylinder body.

[0011] The positioning cylinder body has an installation inner cavity that penetrates along the axial direction. The inflation pin is arranged in the installation inner cavity. An anti - detachment limiting mechanism for preventing the inflation pin from detaching from the positioning cylinder body is arranged on the positioning cylinder body.

[0012] The anti - detachment limiting mechanism includes an anti - detachment limiting ring arranged on the main cylinder body and an annular anti - detachment limiting wall protruding in the main cylinder body. The outer diameter of the main body portion is greater than the inner diameter of the anti - detachment limiting ring. A limiting convex portion is protruding on the main body portion, and the outer diameter of the limiting convex portion is greater than the inner diameter of the anti - detachment limiting wall. The main body portion is arranged between the anti - detachment limiting ring and the anti - detachment limiting wall, and the insertion portion extends out from the anti - detachment limiting wall.

[0013] The main body portion extends upward to form an extending portion. A concave end face is formed by a concave setting on the side of the extending portion, so that the extending portion can extend outwards from the anti - detachment limiting ring. The inflation pin has an intake port and an inflation channel that communicate with each other. The inflation channel is arranged along the axial direction of the inflation pin, and the intake port is arranged on the extending portion.

[0014] The sunken end face is connected to the side end face of the main body part through an inclined end face that slopes downward from the inside to the outside and downward. A spring is sleeved and installed outside the main body part, and the spring is arranged between the anti - detachment limiting ring and the limiting convex part.

[0015] A pressing block with a C - shaped cross - section is detachably installed on the main cylinder body. The bottom end face of the pressing block is provided with an installation groove for the anti - detachment limiting ring to be embedded and installed. The pressing block is installed on the main cylinder body, and the corresponding part of the anti - detachment limiting ring is embedded in the installation groove. The extension part is arranged inside the pressing block, and the air inlet is exposed through the opening of the pressing block.

[0016] An observation port communicating with the installation inner cavity is arranged on the side part of the extension cylinder body corresponding to the position of the insertion part.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The structure is simple. The pressure - maintaining valve with an outward - protruding limiting part is installed on the upper front part or upper side part of the air spring. After installation, when using the special inflating head of this structure, the insertion part of the inflating pin on the inflating head is tightly and sealingly inserted into the air inlet channel of the pressure - maintaining valve. The positioning cylinder body is sleeved outside the pressure - maintaining valve for positioning, and at the same time, the limiting insertion piece is inserted and limited under the outward - protruding limiting part. With the cooperation of the pull rope, the stable positioning installation of the inflating head and the pressure - maintaining valve of this structure can be effectively realized to ensure the stable insertion of the inflating pin, and the disassembly and assembly of the inflating head are relatively quick and convenient. Description of the Drawings

[0018] Figure 1 is a three - dimensional structural schematic diagram of the mutual cooperation and installation of the present invention;

[0019] Figure 2 is a cross - sectional structural schematic diagram of the mutual cooperation and installation of the present invention;

[0020] Figure 3 is a three - dimensional structural schematic diagram of the inflating head in the present invention;

[0021] Figure 4 is a cross - sectional structural schematic diagram of the inflating head in the present invention;

[0022] Figure 5 is a three - dimensional structural schematic diagram of the pressure - maintaining valve in the present invention;

[0023] Figure 6 is a cross - sectional structural schematic diagram of the inflating pin in the present invention;

[0024] Figure 7 is a structural schematic diagram of the present invention in cooperation with the air spring.

[0025] In the figure: 1, pressure-holding valve; 2, inflation pin; 201, main body part; 202, insertion part; 3, inflation head; 10, outward convex limiting part; 11, air inlet channel; 12, air outlet channel; 101, air inlet section; 102, air spring air chamber connection section; 4, limiting insertion piece; 41, connection end; 42, limiting insertion end; 5, pull rope; 421, insertion slot; 422, limiting arm; 301, main cylinder body; 302, extended cylinder body; 20, insertion space; 31, installation inner cavity; 32, anti-disengagement limiting ring; 33, anti-disengagement limiting wall; 2011, limiting convex part; 2012, extension part; 2013, sunken end face; 2014, inclined end face; 7, spring; 8, pressing block; 81, installation groove; 3021, observation port; 21, air inlet; 22, inflation channel; 6, air supply connector; A, air spring. Detailed implementation manner

[0026] The present invention will be further described in detail below in conjunction with the embodiments with reference to the accompanying drawings.

[0027] As Figures 1 to 7 shown, an inflation assembly of an air spring includes a pressure-holding valve 1 and an inflation head 3 with an inflation pin 2. The valve body of the pressure-holding valve 1 has an outward convex limiting part 10. The outward convex limiting part 10 divides the valve body into an air inlet section 101 with an air inlet channel 11 and an air spring air chamber connection section 102 with an air outlet channel 12 for sealing installation with the air chamber interface of the air spring A.

[0028] The inflation head 3 includes a positioning cylinder body. The inflation pin 2 is arranged in the positioning cylinder body. The inflation pin 2 includes a main body part 201 and an insertion part 202. An insertion space 20 for the air inlet section 101 to extend into and be installed is formed between the insertion part 202 and the positioning cylinder body.

[0029] It further includes a limiting insertion piece 4. The two opposite ends of the limiting insertion piece 4 are respectively a connection end 41 and a limiting insertion end 42. The connection end 41 is connected to the positioning cylinder body through a pull rope 5. The limiting insertion end 42 has an insertion slot 421 with a side opening. The insertion slot 421 divides the limiting insertion end 42 into two limiting arms 422.

[0030] In this specific embodiment, the positioning cylinder body includes a main cylinder body 301 and an extended cylinder body 302 arranged in sequence along the axial direction. The main body part 201 is arranged in the main cylinder body 301, and the insertion part 202 is arranged in the extended cylinder body 302. An insertion space 20 is formed between the insertion part 202 and the extended cylinder body 302. The positioning cylinder body is composed of the main cylinder body 301 and the extended cylinder body 302. Among them, the main cylinder body 301 is responsible for the installation of the inflation pin 2, and the extended cylinder body 302 is used for the socket positioning installation between the whole positioning cylinder body and the pressure-holding valve 1. With the appropriate length of the pull rope 5, when disassembling, it is necessary to first release the limiting lock of the limiting insertion piece 4 on the pressure-holding valve 1, and then pull out the positioning cylinder body, thus realizing the stability of the installation.

[0031] In this specific embodiment, the positioning cylinder body has an installation inner cavity 31 that penetrates axially, and the inflation needle 2 is arranged in the installation inner cavity 31. In order to achieve a stable installation connection between the inflation needle 2 and the positioning cylinder body, an anti-disengagement limiting mechanism for preventing the inflation needle 2 from disengaging from the positioning cylinder body is provided on the positioning cylinder body.

[0032] In this specific embodiment, the anti-disengagement limiting mechanism includes an anti-disengagement limiting ring 32 arranged on the main cylinder body 301 and an annular anti-disengagement limiting wall 33 protruding inside the main cylinder body 301. The outer diameter of the main body part 201 is larger than the inner diameter of the anti-disengagement limiting ring 32, and a limiting convex part 2011 is protruding on the main body part 201. The outer diameter of the limiting convex part 2011 is larger than the inner diameter of the anti-disengagement limiting wall 33. The main body part 201 is arranged between the anti-disengagement limiting ring 32 and the anti-disengagement limiting wall 33, and the insertion part 202 extends out from the anti-disengagement limiting wall 33. The above anti-disengagement limiting mechanism has a simple structure and can provide a stable anti-disengagement limiting function.

[0033] In this specific embodiment, an extension part 2012 is upwardly extended on the main body part 201, and a concave end face 2013 is formed by concave setting on the side part of the extension part 2012, so that the extension part 2012 can extend outwards from the anti-disengagement limiting ring 32. The inflation needle 2 has an air inlet 21 and an inflation channel 22 that communicate with each other. The inflation channel 22 is arranged along the axial direction of the inflation needle 2, and the air inlet 21 is arranged on the extension part 2012. The extension part 2012 is used for the setting of the air inlet 21, which is convenient for the connection port of the air inlet 21 to be exposed outside for connecting the air supply joint 6 of the external air supply device.

[0034] In this specific embodiment, the concave end face 2013 is connected to the side end face of the main body part 201 through an inclined end face 2014 that slopes downward from inside to outside. A spring 7 is sleeved and installed outside the main body part 201, and the spring 7 is arranged between the anti-disengagement limiting ring 32 and the limiting convex part 2011. The above design enables the inflation needle 2 to make elastic movement along the axial direction according to the actual insertion situation, so as to better cooperate and plug-install with the corresponding pressure maintaining valve 1 tightly, and is flexible to use.

[0035] In this specific embodiment, a pressure block 8 with a C-shaped cross-section is detachably installed on the main cylinder body 301. An installation groove 81 for embedding and installing the anti-disengagement limiting ring 32 is arranged on the bottom end face of the pressure block 8. The pressure block 8 is installed on the main cylinder body 301, and the corresponding part of the anti-disengagement limiting ring 32 is embedded in the installation groove 81. The extension part 2012 is arranged in the pressure block 8, and the air inlet 21 is exposed through the opening of the pressure block 8. The pressure block 8 is used to achieve the stable installation of the anti-disengagement limiting ring 32 on the main cylinder body 301. At the same time, the cross-section of the pressure block 8 is C-shaped and has an opening, which can expose the connection port of the air inlet 21, facilitating the installation and disassembly of the air supply joint 6 on the external air supply device.

[0036] In this specific embodiment, an observation port 3021 communicating with the installation inner cavity 31 is provided at a position on the side of the extension cylinder body 302 corresponding to the insertion part 202. Through the observation port 3021, it is convenient to observe the insertion position between the insertion part 202 of the inflation needle 2 and the pressure maintaining valve 1, ensuring stable sealed insertion of the two.

[0037] In this specific embodiment, the pressure maintaining valve 1 can be selected as a spring type pressure maintaining valve or a direct acting pressure maintaining valve whose valve core is opened by air pressure to connect the air inlet passage 11 and the air outlet passage 12.

[0038] In this specific embodiment, a pull cord 5 with an appropriate length can be selected according to the specific dimension design. The pull cord 5 is used to prevent the loss of the limit insertion piece 4 and to ensure that the inflation needle 2 cannot be pulled out from the pressure maintaining valve 1 without pulling out the limit insertion piece 4, ensuring the stability of the installation.

[0039] The specific working principle is as follows: The positioning cylinder body is sleeved on the pressure maintaining valve 1, and the insertion part 202 of the inflation needle 2 is tightly and sealingly inserted into the air inlet passage 11 of the pressure maintaining valve 1. After confirming that the inflation needle 2 is inserted in place, the limit insertion piece 4 is inserted, so that the upper part of the air spring air chamber connection section 102 is inserted into the insertion slot 421, and the limit arm 422 is limited below the outward convex limit part 10 to realize the fitting installation of the two. After supplying air, the valve core of the pressure maintaining valve 1 is pushed open by air pressure, and the air inlet passage 11 and the air outlet passage 12 of the pressure maintaining valve 1 are connected to inflate the air spring A; after inflation is completed, first, the limit insertion piece 4 needs to be pulled out to release the limit of the limit insertion piece 4 on the outward convex limit part 10, and then the positioning cylinder body can be pulled out. The valve core of the pressure maintaining valve 1 has no external pressure and automatically resets to a closed state, realizing that the air inlet passage 11 and the air outlet passage 12 of the pressure maintaining valve 1 are not connected to each other.

Claims

1. An inflation assembly for an air spring, comprising a pressure maintaining valve and an inflation head with an inflation pin, characterized in that: The valve body of the pressure maintaining valve has an outwardly convex limiting portion, and the outwardly convex limiting portion divides the valve body into an air inlet section with an air inlet channel and an air spring air chamber connection section with an air outlet channel for sealing installation with the air chamber interface of the air spring; The inflation head includes a positioning cylinder body, the inflation pin is arranged in the positioning cylinder body, the inflation pin includes a main body portion and an insertion portion, and an insertion space for the air inlet section to extend into and be installed is formed between the insertion portion and the positioning cylinder body; The main body portion extends upwardly to be provided with an extension portion, a concave end face is formed by a concave setting on the side of the extension portion, the extension portion extends upwardly and is arranged outside the positioning cylinder body, the inflation pin has an air inlet and an inflation channel which are communicated with each other, the inflation channel is arranged along the axial direction of the inflation pin, and the air inlet is arranged on the extension portion; It further includes a limiting insert piece, the two opposite ends of the limiting insert piece are respectively a connection end and a limiting insertion end, the connection end is connected with the positioning cylinder body through a pull rope, the limiting insertion end has a plugging groove with a side opening, and the plugging groove divides the limiting insertion end into two limiting arms; When in inflation use, the air inlet section extends into and is arranged in the positioning cylinder body, the insertion portion is tightly and sealingly inserted into the air inlet channel, the upper part of the air spring air chamber connection section is inserted into the plugging groove, so that the limiting arms are limitedly arranged below the outwardly convex limiting portion.

2. The inflation assembly of an air spring according to claim 1, characterized in that The positioning cylinder body includes a main cylinder body and an extension cylinder body which are arranged in sequence along the axial direction, the main body portion is arranged in the main cylinder body, the insertion portion is arranged in the extension cylinder body, and the insertion space is formed between the insertion portion and the extension cylinder body.

3. The inflation assembly of an air spring according to claim 2, characterized in that The positioning cylinder body has an installation inner cavity which penetrates along the axial direction, the inflation pin is arranged in the installation inner cavity, and an anti - detachment limiting mechanism for preventing the inflation pin from detaching from the positioning cylinder body is arranged on the positioning cylinder body.

4. The inflation assembly of an air spring according to claim 3, characterized in that The anti - detachment limiting mechanism includes an anti - detachment limiting ring arranged on the main cylinder body and an annular anti - detachment limiting wall protruding in the main cylinder body, the outer diameter of the main body portion is greater than the inner diameter of the anti - detachment limiting ring, a limiting convex portion is protrudingly arranged on the main body portion, the outer diameter of the limiting convex portion is greater than the inner diameter of the anti - detachment limiting wall, the main body portion is arranged between the anti - detachment limiting ring and the anti - detachment limiting wall, and the insertion portion extends out from the anti - detachment limiting wall.

5. The inflation assembly of an air spring according to claim 4, characterized in that The concave end face is connected with the side end face of the main body portion through an inclined end face which is inclined downward from the inside to the outside, and a spring is sleeved and installed outside the main body portion and is arranged between the anti - detachment limiting ring and the limiting convex portion.

6. An inflation assembly for an air spring according to claim 4, characterized in that A C - shaped pressing block is detachably installed on the main cylinder body, an installation groove for embedding and installing the anti - detachment limiting ring is arranged on the bottom end face of the pressing block, the pressing block is installed on the main cylinder body, the corresponding part of the anti - detachment limiting ring is embedded in the installation groove, the extension portion is arranged in the pressing block, and the air inlet is exposed through the opening of the pressing block.

7. The inflation assembly of an air spring according to claim 3, characterized in that An observation port communicating with the installation inner cavity is provided at a position on the side of the extension cylinder corresponding to the insertion part.

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