Pipe joint for automobile brake pipeline

Abstract

The invention relates to the technical field of brake pipelines, and discloses a pipe joint for an automobile brake pipeline, the pipe joint comprises a male joint and a female joint which are detachably connected, the male joint comprises a first shell and a supporting shell located in the first shell, the supporting shell is located in the first shell, and a first channel for liquid to flow exists between the supporting shell and the first shell; four second cylindrical channels communicating with the first channels are evenly formed in the connecting position, close to the second shell, of the supporting shell and the first shell at intervals in a penetrating mode, and a third annular channel communicating with the second channels is formed in the inner wall face, close to the second shell, of the first shell. And fourth channels with the same number as the third channels are formed in the second abutting block in a penetrating mode, and a driving assembly for driving the fourth channels in the second abutting block to communicate with the third channels is arranged outside the second shell.

Description

Technical Field

[0001] The invention relates to the technical field of brake pipes, in particular to a pipe joint for automobile brake pipes. Background Art

[0002] The automobile brake pipe joint is an important component in the automobile brake system. It mainly connects the brake caliper and the brake hose, also known as the brake caliper pipe joint. It is usually made of metal materials and has high temperature resistance, pressure resistance and corrosion resistance to ensure the normal operation of the brake system. The main function of the brake pipe joint is to connect the brake line with the piston connecting rod to absorb and relieve the impact during braking, and prevent external impurities and moisture from entering the brake system, thereby affecting the braking effect.

[0003] The joints at both ends of the traditional brake pipe are threaded and sealed with sealing rings. However, after long-term use, the above structure has a high probability of leakage, which affects the braking performance and poses a safety hazard. In addition, it is inconvenient to install the two ends. Summary of the invention

[0004] The invention aims to provide a pipe joint for automobile brake pipe, which has the effects of quick installation and good sealing performance.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: comprising a male connector and a female connector that can be detachably connected, the male connector comprising a shell body 1 and a supporting shell located in the shell body 1, the supporting shell being located in the shell body 1 and having a channel 1 between the supporting shell and the shell body 1 for liquid flow, four cylindrical channels 2 connected to the channel 1 being evenly spaced and penetrated at the connection between the supporting shell and the shell body 1 close to the shell body 2, an annular channel 3 connected to the channel 2 being provided on the inner wall surface of the shell body 1 close to the shell body 2, an abutment block 1 being slidably connected in the shell body 1 and the supporting shell, a pressure rod being vertically fixed to the end surface of the abutment block 1 located in the shell body 1, the pressure rod being partially located in the supporting shell, a spring 1 being provided on the outer sleeve of the pressure rod, the other end of the spring 1 being connected to the inner wall end surface of the supporting shell, the spring driving a part of the abutment block to extend out of the shell body 1, the female connector comprising a shell body 2, an abutment block 2 being slidably connected in the shell body 2, channels 4 being penetrated in the abutment block 2 and having the same number as the channels 3, and a spring 2 being provided outside the shell body 2 for driving the channels 4 in the abutment block 2 to communicate with the channels 3. A driving component, the driving component includes an operating ring plate sleeved on the outside of the second shell, a connecting rod connected to the second abutment block located in the second shell is vertically fixed to the inner wall surface of the operating ring plate, a U-shaped limiting groove is penetrated through the side surface of the second shell, the connecting rod penetrates and is limitedly slidably connected in the limiting groove, four card balls 1 are evenly spaced on the inner wall surface of the second shell near the first shell, the card ball 1 located in the second shell is connected to a driving spring 1, the driving spring 1 drives a part of the card ball to extend out of the inner wall surface of the second shell, and the card ball 1 can be clamped on the abutment block The channel four on the circumferential side of the block two is a circular port, and a slide groove two is concavely arranged at the end of the shell two away from the shell one, and a connecting ring plate is rotatably connected in the slide groove two, and four plug rods are evenly spaced on the inner wall of the connecting ring plate, and the plug rods are L-shaped, and the cross bar of the plug rod can penetrate into the channel four, and a slide groove three is arranged on the end face of the abutting block two away from the shell one, and the slide groove three is perpendicular to the channel four, and the groove depth of the slide groove three gradually decreases in the direction close to the connecting ring plate, and the connection between the slide groove three and the channel four is set as a smooth curved surface.

[0006] By adopting the above technical scheme, when the male connector and the female connector are connected and installed, the snap balls in the female connector are snapped into the ports of channel four one by one, sealing the ports of channel four in the female connector to prevent the liquid in the female connector from flowing out. Similarly, in the male connector, when spring one is stationary, it drives a part of the abutment block to expose shell one. At this time, abutment block one is at a certain distance from the annular channel three, and the liquid in the male connector will not flow out of shell one in the direction of the abutment block, that is, the liquid in the male connector and the female connector are tightly sealed respectively; when the male connector and the female connector are installed, the first step is to align shell one with shell two, and the snap ball two on the inner wall of shell two is snapped into the snap groove on the outer side of shell one, and then a person acts on the operating ring plate by hand, and rotates the operating ring plate clockwise from shell two to shell one, and the operating ring plate drives the abutment block through the connecting rod. Block 2 rotates clockwise, and at this time, due to the rotation of the abutment block 2, the card ball 1 is separated from the end face of channel 4, but since a plug rod is still inserted in channel 4, channel 4 is still in a blocked state, and the liquid will not flow out; the second step, then the abutment block 2 moves toward the abutment block 1, and the abutment block 2 drives the abutment block 1 to move into the shell 1 to compress the spring 1, until the abutment block 2 moves to the end face of channel 4 on its side and is connected with the annular channel 3, and the end of the plug rod is located at the end face of channel 4; the third step, as the operating ring plate rotates counterclockwise again, the plug rod slides out of channel 4 into the slide groove 3 on the end face of the abutment block 2. At this time, channel 4, channel 3, channel 2 and channel 1 are all connected, the male connector and the female connector are connected, and the entire installation and connection process is simple and easy to operate. In each step, it is ensured that the liquid in the male connector and the female connector will not leak, and the entire device has good sealing performance.

[0007] The present invention is further configured as follows: four L-shaped slide grooves four are arranged on the circumferential surface of the abutment block two, and the card ball one can be slidably connected in the slide grooves four.

[0008] By adopting the above technical solution, when the abutment block 2 approaches the abutment block 1, the card ball 1 on the inner wall of the shell 2 slides in the horizontal section of the slide groove 4. When the abutment block 2 connects various channels during the final counterclockwise rotation, the card ball 2 is stuck in the vertical section of the slide groove 4, thereby improving the stability of the abutment block 2 after final installation.

[0009] The present invention is further configured as follows: a locking ball 2 is symmetrically arranged on the inner wall surface of the shell 2 near the shell 1, and the locking ball 2 located in the shell 2 is connected to a driving spring 2. The driving spring 2 drives the locking ball 2 to partially extend out of the inner wall surface of the shell 2. A locking groove is concavely arranged on the outer side surface of the circumference of the end of the shell 1 near the shell 2, and the locking ball 2 can be locked in the locking groove.

[0010] By adopting the above technical solution, when the shell one and the shell two are close to each other, the two are connected by the snap ball two being snapped into the snap groove, so as to facilitate the subsequent connection work of each channel.

[0011] The present invention is further configured as follows: a limiting ring rod is protruding along the circumference at the two ends of the shell away from the shell one, a slide groove one is concavely provided on the end surface of the limiting ring rod, a connecting ring rod fixed at the two ends of the spring is rotatably connected in the slide groove one, and the spring two drives the operating ring plate to move away from the limiting ring rod.

[0012] By adopting the above technical solution, in the three steps of connecting each channel, when rotating clockwise, the abutment block 2 and the operating ring plate rotate, and the connecting ring rod connected to the end of the operating ring plate can slide in the slide groove 1 at the second end of the shell. Similarly, the connecting ring plate at the end of the plug rod can slide in the slide groove 2 at the second end of the shell without affecting the rotation of the abutment block 2. Similarly, when rotating counterclockwise, the operating ring plate, the limiting ring rod of the second shell, and the connecting ring plate do not affect each other.

[0013] The present invention is further configured as follows: the inner wall surface of the shell 1 close to the shell 2 and the inner wall surface of the support shell close to the shell 2 are both provided with a plurality of sealing rings.

[0014] By adopting the above technical solution, the sealing ring can further enhance the sealing performance of the entire device and prevent liquid leakage.

[0015] The beneficial effects of the present invention are as follows: when the male connector and the female connector are not connected, the snap balls in the female connector are snapped into the ports of channel four one by one, sealing the ports of channel four in the female connector to prevent the liquid in the female connector from flowing out. Similarly, in the male connector, when spring one is stationary, it drives a portion of the abutment block to expose shell one. At this time, abutment block one is at a certain distance from the annular channel three, and the liquid in the male connector will not flow out of shell one in the direction of the abutment block, that is, the liquid in the male connector and the female connector are tightly sealed respectively. When installing the male connector and the female connector, the first step is to align shell one with shell two, and the snap ball two on the inner wall of shell two is snapped into the snap groove on the outer side of shell one. Then, a person acts on the operating ring plate by hand, and rotates the operating ring plate clockwise from shell two to shell one. The operating ring plate drives the abutment block through the connecting rod. Block 2 rotates clockwise, and at this time, due to the rotation of the abutment block 2, the card ball 1 is separated from the end face of channel 4, but since a plug rod is still inserted in channel 4, channel 4 is still in a blocked state, and the liquid will not flow out; the second step, then the abutment block 2 moves toward the abutment block 1, and the abutment block 2 drives the abutment block 1 to move into the shell 1 to compress the spring 1, until the abutment block 2 moves to the end face of channel 4 on its side and is connected with the annular channel 3, and the end of the plug rod is located at the end face of channel 4; the third step, as the operating ring plate rotates counterclockwise again, the plug rod slides out of channel 4 into the slide groove 3 on the end face of the abutment block 2. At this time, channel 4, channel 3, channel 2 and channel 1 are all connected, the male connector and the female connector are connected, and the entire installation and connection process is simple and easy to operate. In each step, it is ensured that the liquid in the male connector and the female connector will not leak, and the entire device has good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure.

[0019] Figure 3 It is a schematic diagram of the explosion structure of the present invention.

[0020] Figure 4 yes Figure 3 Side view of.

[0021] Figure 5 It is a structural schematic diagram of the abutment block 2 in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the shell body 2 in the present invention.

[0023] Figure 7 It is a structural schematic diagram of the shell 1 in the present invention.

[0024] In the figure, 1, shell body 1; 2, support shell; 3, channel 1; 4, channel 2; 5, channel 3; 6, abutment block 1; 7, pressure rod; 8, spring 1; 9, shell body 2; 10, abutment block 2; 11, channel 4; 12, operating ring plate; 13, connecting rod; 14, limiting groove; 15, blocking ball 1; 16, slide groove 2; 17, connecting ring plate; 18, plug rod; 19, slide groove 3; 20, slide groove 4; 21, blocking ball 2; 22, blocking groove; 23, limiting ring rod; 24, slide groove 1; 25, spring 2; 26, sealing ring; 27, connecting ring rod; 28, port. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment, a pipe joint for automobile brake pipe, such as Figure 1-7As shown, it includes a male connector and a female connector that can be detachably connected. The male connector includes a shell body 1 and a support shell 2 located in the shell body 1. The support shell 2 is located in the shell body 1 and there is a channel 3 for liquid flow between the support shell 2 and the shell body 1. Four cylindrical channels 4 connected to the channel 3 are evenly spaced and penetrated at the connection between the support shell 2 and the shell body 1 close to the shell body 2 9. An annular channel 3 5 connected to the channel 4 is provided on the inner wall surface of the shell body 1 close to the shell body 2 9. An abutment block 6 is slidably connected in the shell body 1 and the support shell 2. A pressure rod 7 is vertically fixed to the end surface of the abutment block 6 located in the shell body 1. The pressure rod 7 is partially located in the support shell 2. A spring 8 is provided on the outer sleeve of the pressure rod 7. The other end of the abutment block 18 is connected to the inner wall end face of the support shell 2, and the spring drives the abutment block 16 to partially extend out of the shell 1. The female joint includes a shell 29, and an abutment block 210 is slidably connected inside the shell 29. The abutment block 210 is provided with four channels 11 having the same number as the three channels 5. A driving component for driving the four channels 11 in the abutment block 210 to communicate with the three channels 5 is provided outside the shell 29. The driving component includes an operating ring plate 12 sleeved outside the shell 29, and a connecting rod 13 connected to the abutment block 210 located in the shell 29 is vertically fixed on the inner wall surface of the operating ring plate 12. A U-shaped limiting groove 14 is penetrated through the side of the shell 29, and the connecting rod 13 penetrates and is slidably connected to the limiting groove 14, close to the limiting groove 14. Four card balls 15 are evenly spaced on the inner wall of the shell 29 of the shell 1. The card ball 15 located in the shell 29 is connected to a driving spring 1. The driving spring 1 drives the card ball 15 to partially extend out of the inner wall of the shell 29. The card ball 15 can be snapped into the circular port 28 of the channel 4 11 on the circumferential side of the abutment block 210. A slide groove 216 is concavely provided at the end of the shell 29 away from the shell 1. A connecting ring plate 17 is rotatably connected in the slide groove 216. Four plug rods 18 are evenly spaced on the inner wall of the connecting ring plate 17. The plug rods 18 are L-shaped. The cross bar of the plug rods 18 can penetrate into the channel 4 11. A slide groove 319 is provided on the end surface of the abutment block 210 away from the shell 1. The slide groove 319 and the channel 4 11 is vertical, and the groove depth of the slide groove three 19 gradually decreases in the direction close to the connecting ring plate 17. The connection between the slide groove three 19 and the channel four 11 is set as a smooth curved surface. When the male connector and the female connector are not connected, the card ball one 15 in the female connector is correspondingly connected to the port 28 of the channel four 11, and the port 28 of the channel four 11 in the female connector is sealed to prevent the liquid in the female connector from flowing out. Similarly, in the male connector, when the spring one 8 is stationary, the abutment block one 6 is driven to partially expose the shell one 1. At this time, the abutment block one 6 and the annular channel three 5 have a certain distance, and the liquid in the male connector will not flow out from the shell one 1 in the direction of the abutment block one 6, that is, the liquid in the male connector and the female connector are tightly sealed respectively;When installing the male connector and the female connector, the first step is to align the shell 1 and the shell 2 9, and the card ball 21 on the inner wall of the shell 2 9 is carded into the card groove 22 on the outer side of the shell 1, and then the human hand acts on the operating ring plate 12, and the operating ring plate 12 is rotated clockwise from the shell 2 9 to the shell 1 1. The operating ring plate 12 drives the abutment block 2 10 to rotate clockwise through the connecting rod 13. At this time, due to the rotation of the abutment block 2 10, the card ball 15 is separated from the end face of the channel 4 11, but because the insertion rod 18 is still inserted in the channel 4 11, the channel 4 11 is still in a blocked state, and the liquid will not flow out; the second step is then to move the abutment block 2 10 toward the abutment block 1 6 movement, the abutment block 2 10 drives the abutment block 1 6 to move into the housing 1 to compress the spring 1 8, until the abutment block 2 10 moves to the end face of the channel 4 11 on its side and is connected to the annular channel 3 5, at which time the end of the plug rod 18 is located at the end face of the channel 4 11; the third step, as the operating ring plate 12 rotates counterclockwise again, the plug rod 18 slides out of the channel 4 11 to the slide groove 3 19 on the end face of the abutment block 2 10, at which time the channel 4 11, channel 3 5, channel 2 4 and channel 1 3 are all connected, the male connector and the female connector are well connected, the entire installation and connection process is simple and easy to operate, and in each step, it is ensured that the liquid in the male connector and the female connector will not leak, and the entire device has good sealing performance. ;

[0027] Furthermore, four L-shaped slide grooves 4 20 are arranged on the circumferential surface of the abutment block 2 10, and the locking ball 15 can be slidably connected to the slide groove 4 20. When the abutment block 2 10 is close to the abutment block 1 6, the locking ball 15 on the inner wall of the shell 2 9 slides in the horizontal section of the slide groove 4 20. When the abutment block 2 10 connects various channels in the final counterclockwise rotation, the locking ball 21 is stuck in the vertical section of the slide groove 4 20, thereby improving the stability of the abutment block 2 10 after the final installation.

[0028] Furthermore, a snap-in ball 21 is symmetrically arranged on the inner wall of the shell 29 near the shell 1, and the snap-in ball 21 located in the shell 29 is connected to a driving spring 2. The driving spring 2 drives the snap-in ball 21 to partially extend out of the inner wall of the shell 29. A snap-in groove 22 is concavely arranged on the outer side surface of the circumference of the end of the shell 1 near the shell 29, and the snap-in ball 21 can be snapped into the slot 22. When the shell 1 and the shell 29 are close to each other, the snap-in ball 21 is snapped into the slot 22 to connect the two, so as to facilitate the subsequent connection of each channel.

[0029] Furthermore, a limiting ring rod 23 is protruded along the circumference at the end of the shell 29 away from the shell 1, and a slide groove 24 is concavely provided on the end surface of the limiting ring rod 23. A connecting ring rod 27 fixed to the end of a spring 25 is rotatably connected in the slide groove 24. The spring 25 drives the operating ring plate 12 to move away from the limiting ring rod 23. In the three steps of connecting the various channels, when rotating clockwise, the abutment block 210 and the operating ring plate 12 rotate, and the connecting ring rod 27 connected to the end of the operating ring plate 12 can slide in the slide groove 24 at the end of the shell 29. Similarly, the connecting ring plate 17 at the end of the plug rod 18 can slide in the slide groove 216 at the end of the shell 29 without affecting the rotation of the abutment block 10. Similarly, when rotating counterclockwise, the operating ring plate 12, the limiting ring rod 23 of the shell 29, and the connecting ring plate 17 do not affect each other.

[0030] Furthermore, the inner wall surface of the housing 1 close to the housing 2 9 and the inner wall surface of the support shell 2 close to the housing 2 9 are both provided with a plurality of sealing rings 26. The sealing rings 26 can further enhance the sealing performance of the entire device to prevent liquid leakage.

[0031] Working principle of a pipe joint for automobile brake pipe:

[0032] When the male connector and the female connector are not connected, at this time, the card ball 15 in the female connector is carded one by one on the port 28 of the channel four 11, sealing the port 28 of the channel four 11 in the female connector to prevent the liquid in the female connector from flowing out. Similarly, in the male connector, when the spring 18 is stationary, it drives the abutment block 16 to partially expose the shell 1. At this time, the abutment block 16 is at a certain distance from the annular channel three 5, and the liquid in the male connector will not flow out of the shell 1 in the direction of the abutment block 16, that is, the liquid in the male connector and the female connector are tightly sealed respectively; when the male connector and the female connector are installed, the first step is to align the shell 1 with the shell 2 9, and the card ball 21 on the inner wall of the shell 2 9 is carded in the card groove 22 on the outer side of the shell 1, and then the human hand acts on the operating ring plate 12, and the operating ring plate 12 is rotated clockwise from the shell 2 9 to the shell 1. The operating ring plate 12 drives the abutment block 2 10 to rotate clockwise through the connecting rod 13. At the same time, due to the rotation of the abutment block 2 10, the card ball 15 is separated from the end face of the channel 4 11, but because the insertion rod 18 is still inserted in the channel 4 11, the channel 4 11 is still in a blocked state, and the liquid will not flow out; the second step, the abutment block 2 10 then moves toward the abutment block 1 6, and the abutment block 2 10 drives the abutment block 1 6 to move into the shell 1 to compress the spring 1 8 until the abutment block 2 10 moves to the end face of the channel 4 11 on its side and is connected with the annular channel 3 5, at this time the end of the insertion rod 18 is located at the end face of the channel 4 11; the third step, as the operating ring plate 12 rotates counterclockwise again, the insertion rod 18 slides out of the channel 4 11 into the slide groove 3 19 on the end face of the abutment block 2 10, at this time the channel 4 11, the channel 3 5, the channel 2 4 and the channel 1 3 are all connected, the male connector and the female connector are well connected, the entire installation and connection process is simple and easy to operate, and in each step it is ensured that the liquid in the male connector and the female connector will not leak, and the entire device has good sealing performance.

Claims

1. A pipe joint for automobile brake pipe, characterized in that: The invention comprises a male connector and a female connector which can be detachably connected, wherein the male connector comprises a shell (1) and a supporting shell (2) located in the shell (1), wherein the supporting shell (2) is located in the shell (1) and a channel (3) for liquid flow is provided between the supporting shell (2) and the shell (1), and four cylindrical channels (4) which are connected to the channel (3) are evenly spaced and penetrated at the connection between the supporting shell (2) and the shell (1) which is close to the shell (9), and an annular channel (5) which is connected to the channel (4) is provided on the inner wall surface of the shell (1) which is close to the shell (9), and an abutment block (6) which is slidably connected to the shell (1) and the supporting shell (2) is provided, and abutment block (6) which is located in the shell (1) is provided. A pressure rod (7) is vertically fixed to the end face of the abutment block one (6) in (1), and a part of the pressure rod (7) is located in the support shell (2). A spring one (8) is provided on the outer sleeve of the pressure rod (7), and the other end of the spring one (8) is connected to the inner wall end face of the support shell (2). The spring drives the abutment block one (6) to extend out of the shell one (1). The female connector includes a shell two (9), and an abutment block two (10) is slidably connected in the shell two (9). The abutment block two (10) is provided with a channel four (11) which is the same number as the channel three (5) and passes through the channel four (11) in the abutment block two (10). A driving component is provided outside the shell two (9) to drive the channel four (11) in the abutment block two (10) to connect with the channel three (5).

2. The pipe joint for automobile brake pipe according to claim 1, characterized in that: The driving assembly comprises an operating ring plate (12) sleeved outside the second shell (9); a connecting rod (13) connected to the second abutting block (10) located in the second shell (9) is vertically fixed on the inner wall surface of the operating ring plate (12); a U-shaped limiting groove (14) is penetrated through the side surface of the second shell (9); the connecting rod (13) penetrates and is slidably connected in the limiting groove (14); four locking balls (15) are evenly spaced on the inner wall surface of the second shell (9) near the first shell (1); the locking ball (15) located in the second shell (9) is connected to a driving spring (1); the driving spring (1) drives the locking ball (15) to partially extend out of the inner wall surface of the second shell (9); the locking ball (15) can be locked to a circular port (28) of the fourth channel (11) on the circumferential side surface of the abutting block (10).

3. The pipe joint for automobile brake pipe according to claim 2, characterized in that: The end of the shell body 2 (9) away from the shell body 1 (1) is concavely provided with a second slide groove (16), and a connecting ring plate (17) is rotatably connected in the second slide groove (16). Four insertion rods (18) are evenly spaced on the inner wall of the connecting ring plate (17). The insertion rods (18) are L-shaped, and the cross bar of the insertion rods (18) can penetrate into the channel 4 (11). The end surface of the abutment block 2 (10) away from the shell body 1 (1) is provided with a third slide groove (19), and the third slide groove (19) is perpendicular to the channel 4 (11), and the groove depth of the third slide groove (19) gradually decreases in the direction close to the connecting ring plate (17), and the connection between the third slide groove (19) and the channel 4 (11) is set as a smooth curved surface.

4. The pipe joint for automobile brake pipe according to claim 3, characterized in that: The circumferential surface of the abutment block 2 (10) is provided with four L-shaped sliding grooves 4 (20), and the locking ball 1 (15) can be slidably connected in the sliding grooves 4 (20).

5. The pipe joint for automobile brake pipe according to claim 4, characterized in that: A second locking ball (21) is symmetrically arranged on the inner wall surface of the second shell (9) near the first shell (1), and the second locking ball (21) located in the second shell (9) is connected to a second driving spring, and the second driving spring drives the second locking ball (21) to partially extend out of the inner wall surface of the second shell (9), and a locking groove (22) is concavely arranged on the outer side surface of the circumference of the end of the first shell (1) near the second shell (9), and the second locking ball (21) can be locked in the locking groove (22).

6. The pipe joint for automobile brake pipe according to claim 5, characterized in that: A limiting ring rod (23) is provided at the end of the second shell (9) away from the first shell (1) along the circumference, and a sliding groove (24) is provided inwardly on the end surface of the limiting ring rod (23). A connecting ring rod (27) fixed to the end of the second spring (25) is rotatably connected to the sliding groove (24), and the second spring (25) drives the operating ring plate (12) to move away from the limiting ring rod (23).

7. The pipe joint for automobile brake pipe according to claim 6, characterized in that: The inner wall surface of the shell 1 (1) close to the shell 2 (9) and the inner wall surface of the support shell (2) close to the shell 2 (9) are both provided with sealing rings (26).

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