Neutral gear protection valve

Abstract

The utility model relates to the technical field of automobile parts, in particular to a neutral gear protection valve which comprises a valve body, a first air inlet, a first air outlet and a first containing cavity extending in the first direction. The valve rod is connected to the interior of the first containing cavity in a sliding mode, the valve rod slides relative to the first containing cavity in the first direction, the valve rod is provided with a first position and a second position, an airflow channel is formed in the valve rod, the airflow channel penetrates through the valve rod, and the airflow channel communicates with the first air inlet; mechanical linkage control over neutral gear signals of the power takeoff and the transmission is achieved, it is guaranteed that the power takeoff can only be used when the transmission is in a neutral gear or a fixed gear, the power takeoff can be pushed to the neutral gear in the midway, but other gears cannot be engaged, the power takeoff can be used for parking and traveling, and the situation that a synchronizer of the transmission is abnormally abraded can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a neutral protection valve. Background Art

[0002] All control functions of existing manual transmissions can only be realized by manual operation, and the clutch, transmission shifting, and the power take-off attached to the transmission cannot be controlled in linkage; if the driver is unfamiliar with the operating procedures or makes mistakes, and uses the power take-off to shift gears during transmission operation, the transmission will be difficult to synchronize due to the heavy load and moment of inertia at the rear end of the power take-off, and the gear shifting process will take a long time, which will also accelerate the wear of the synchronizer and cause early damage to the transmission.

[0003] This type of protection valve is mainly used for manual transmissions such as ZF16S2530 and 16S2230. It is installed at the original neutral signal switch position, and then the original signal switch is installed on it to keep the vehicle wiring harness unchanged, and introduce the rear air path of the power take-off solenoid valve into this valve to achieve mechanical linkage control. Through appropriate changes in the interface, this protection valve can be transplanted to other manual transmissions that need to be equipped with a power take-off.

[0004] The air path behind the power take-off solenoid valve is introduced into this valve, and mechanical linkage control is achieved with the transmission neutral signal control valve to ensure that the power take-off is used only when the transmission is in neutral or fixed gear and can be pushed to neutral midway.

[0005] However, other gears cannot be engaged, so that it can be used for both parking and driving, and the transmission synchronizer can be abnormally worn; through the transmission neutral gear signal electrical linkage, a reverse protection function is reserved to ensure that the power take-off can only be used when the transmission is in neutral. After the gear is engaged, it cannot be used due to power and air cut-off, which plays a role in preventing driving power take-off and avoiding the automatic lifting of the cargo box and hanging upside down overpasses and cables due to incorrect operation of the power take-off during driving, causing major losses. The valve plays an anti-error protection role for the power take-off and the transmission. After failure (after removing the power take-off control air path on the protection valve), it does not affect the original gear-engaging and driving function of the transmission.

[0006] Therefore, those skilled in the art provide a neutral protection valve to solve the problems raised in the above background technology. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides:

[0008] A neutral protection valve comprises: a valve body, on which a first air inlet and a first air outlet are formed, and a first accommodating cavity extending along a first direction is also formed on the valve body;

[0009] a valve stem, slidably connected to the inside of the first accommodating chamber, and the valve stem slides relative to the first accommodating chamber along the first direction, the valve stem has a first position and a second position, an air flow channel is formed in the valve stem, the air flow channel passes through the valve stem, and the air flow channel is communicated with the first air inlet;

[0010] A spacer sleeve, fixedly connected to the first accommodating cavity and sleeved on the valve stem, wherein a first cavity is formed on the spacer sleeve, and the first cavity is communicated with the first exhaust port;

[0011] A valve assembly, slidably connected in the first accommodating chamber;

[0012] When the valve stem is in the first position, the valve stem abuts against the valve assembly to close the airflow channel, and when the valve stem is in the second position, the valve stem separates from the valve assembly to connect the airflow channel with the first exhaust port.

[0013] Preferably: a first elastic return member is provided in the first accommodating cavity, and one end of the first elastic return member abuts against the valve stem, and the other end abuts against the valve body, for driving the valve stem to move from the second position to the first position.

[0014] Preferably: a sealing member and an elastic member are slidably connected in the first accommodating cavity, and when the valve stem is located at the first position, the sealing member abuts against the valve stem, and the elastic member is located in the first accommodating cavity, and the elastic member abuts against the sealing member, and the sealing member abuts against the valve stem under the action of the elastic force of the elastic member.

[0015] Preferably: the neutral protection valve further comprises: a fixing seat; the first accommodating chamber has a first opening, the fixing seat is connected to the first opening, and one end of the elastic member away from the sealing member abuts against the fixing seat.

[0016] Preferably: the neutral protection valve further comprises: a valve seat, which is fixedly connected to the inside of the first accommodating chamber and sleeved on the outside of the valve stem, and the inner wall of the valve seat is spaced from the valve stem;

[0017] The valve seat is provided with a limiting ring, the limiting ring is convexly arranged on the inner wall of the valve seat, and the limiting ring is used to limit the movement of the valve seat from the first position toward the second position.

[0018] Preferably: the neutral protection valve further comprises an exhaust mechanism, the exhaust mechanism comprising: an exhaust cavity formed in the valve body, the exhaust cavity being communicated with the first cavity, and the exhaust cavity having a second opening;

[0019] An exhaust seat, wherein a third exhaust port is formed on the exhaust seat, and the third exhaust port is used for the exhaust chamber to communicate with the outside;

[0020] A dust cover connected to a side of the exhaust seat away from the exhaust cavity;

[0021] A gasket is connected between the dust cover and the exhaust seat and is used to close the third exhaust port.

[0022] Preferably, a second cavity is formed on the valve seat, and the second cavity is communicated with the first cavity and the exhaust cavity.

[0023] Preferably: the neutral protection valve further comprises: a lock pin, a second accommodating cavity is formed on the valve body, the second accommodating cavity extends along a second direction, and the second accommodating cavity is communicated with the first accommodating cavity, the lock pin is slidably connected in the second accommodating cavity, and the lock pin slides relatively along the second direction;

[0024] A second elastic return member is accommodated in the second accommodating cavity and abuts against the lock pin;

[0025] a limiting member, connected to the second accommodating cavity, and used to limit the movement of the locking pin along the second direction;

[0026] The first direction and the second direction are perpendicular to each other.

[0027] Preferably: the neutral protection valve further comprises: a transition pin, slidably connected to the valve body along the second direction;

[0028] A receiving groove is formed on the lock pin, and the transition pin penetrates through the valve seat and fits into the receiving groove.

[0029] Preferably: the neutral protection valve further comprises: a connecting seat connected to the valve body, a through hole being formed on the connecting seat, the through hole penetrating the connecting seat along the second direction, and the through hole corresponds to the second accommodating cavity;

[0030] The push rod is slidably connected in the through hole along the second direction and abuts against an end of the locking pin away from the second elastic return member.

[0031] Technical effects and advantages of the utility model:

[0032] 1. The mechanical linkage control between the power take-off and the neutral gear signal of the transmission is realized to ensure that the power take-off can only be used when the transmission is in neutral or fixed gear. It can be pushed to neutral during the process, but cannot be engaged in other gears, so that it can be used for parking and driving, and can prevent abnormal wear of the transmission synchronizer.

[0033] 2. Through the transmission neutral gear signal electrical linkage, a reverse protection function is reserved to ensure that the power take-off can only be used when the transmission is in neutral. After the gear is engaged, the power is cut off and the air is cut off and it cannot be used, which prevents the power take-off during driving and avoids damage caused by incorrect operation during driving.

[0034] 3. The neutral protection valve of this application plays an anti-error protection role for the power take-off and the transmission. After failure, the power take-off control air circuit on the protection valve can be removed without affecting the original gear-engaging and driving function of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the neutral protection valve provided by the present application;

[0036] Figure 2 It is a schematic diagram of the structure of the side of the neutral protection valve provided by the present application;

[0037] Figure 3 is a schematic cross-sectional structure diagram of the first exhaust port in the neutral protection valve provided in the present application;

[0038] Figure 4 It is a schematic diagram of the cross-sectional structure of the valve body in the neutral protection valve provided by the present application;

[0039] Figure 5 is a schematic cross-sectional structure diagram of the exhaust mechanism in the neutral protection valve provided in the present application;

[0040] Figure 6 It is a schematic diagram of the cross-sectional structure of the second overflow channel in the neutral protection valve provided in the present application.

[0041] In the figure:

[0042] 10. valve body; 11. first air inlet; 12. first air outlet; 13. first accommodating chamber; 131. first open port; 14. first overflow channel; 141. third air outlet; 15. first steel ball;

[0043] 16. exhaust cavity; 161. second opening;

[0044] 17. second overflow channel; 171. fourth exhaust port;

[0045] 18. second steel ball; 19. second accommodating chamber;

[0046] 20. valve stem; 21. air flow channel; 22. second air inlet; 23. second air outlet;

[0047] 30. spacer; 31. limit portion; 32. first cavity; 33. first sealing ring; 34. first lip sealing ring; 35. first retaining ring;

[0048] 40. valve assembly; 41. sealing member; 411. receiving hole; 412. abutting portion; 42. gasket 1; 43. elastic member; 44. fixing seat; 45. second sealing ring; 46. elastic retaining ring for first hole; 47. elastic washer;

[0049] 50. A first elastic reset member;

[0050] 60. valve seat; 61. limiting ring; 62. second cavity; 63. third sealing ring;

[0051] 70. Exhaust mechanism; 71. Exhaust seat; 711. Exhaust port 1; 72. Dust cover; 74. Gasket 2; 75. Fourth sealing ring; 76. Elastic retaining ring for second hole; 77. Rivet;

[0052] 81, locking pin; 811, receiving groove; 82, second elastic reset member; 83, limiting member; 84, transition pin;

[0053] 91. Connecting seat; 911. Through hole; 92. Push rod. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0055] For examples, see Figures 1 to 6 In this embodiment, a neutral protection valve is provided, including a valve body 10, a valve stem 20, a spacer sleeve 30, and a valve assembly 40;

[0056] The valve body 10 is formed with a first air inlet 11 and a first air outlet 12, and the valve body 10 is also formed with a first accommodating cavity 13 extending along a first direction, the first air inlet 11 is arranged on the bottom surface of the valve body 10, and the first air outlet 12 is arranged on the bottom surface of the valve body 10. Figure 2 On the side wall on the left side of the middle bottom surface, the first air inlet 11 is communicated with the first accommodating cavity 13.

[0057] The valve stem 20 is a cylindrical rod-shaped structure, and the valve stem 20 extends along the first direction. The valve stem 20 is slidably connected to the inside of the first accommodating chamber 13, and the valve stem 20 slides relative to the first accommodating chamber 13 along the first direction. An air flow channel 21 is formed on the valve stem 20, and the air flow channel 21 extends along the extension direction of the valve stem 20. The air flow channel 21 has a second air inlet 22 and a second air outlet 23. The second air inlet 22 extends along the radial direction of the valve stem 20 and is connected to the air flow channel 21. There are multiple second air inlets 22, and the multiple second air inlets 22 are evenly spaced along the circumference of the valve stem 20.

[0058] The second exhaust port 23 is disposed at an end of the valve stem 20 away from the second air inlet 22;

[0059] The spacer 30 is fixedly connected to the first accommodating chamber 13, and a first sealing ring 33 is provided between the spacer 30 and the first accommodating chamber 13. The spacer 30 is sleeved on the valve stem 20, and a first lip sealing ring 34 and a first retaining ring 35 are provided in the spacer 30. A limiting portion 31 is convexly provided on the inner wall of the spacer 30, and the first lip sealing ring 34 is located between the first retaining ring 35 and the limiting portion 31. The first lip sealing ring 34, the first retaining ring 35 and the limiting portion 31 are all located between the second air inlet 22 and the second air inlet 22;

[0060] The inner wall of the first lip seal ring 34 is sleeved on the valve stem 20, and the outer wall of the first lip seal ring 34 abuts against the inner wall of the spacer 30. The first retaining ring 35 and the limiting portion 31 are used to limit the position of the first lip seal ring 34 in the first accommodating chamber 13.

[0061] A first cavity 32 is formed on the spacer 30, and the first cavity 32 is communicated with the first exhaust port 12;

[0062] The valve assembly 40 is slidably connected in the first accommodating chamber 13;

[0063] The valve stem 20 has a first position and a second position relative to the first accommodating chamber 13;

[0064] Initially, the valve stem 20 is in the first position, and when the valve stem 20 is in the first position, the valve stem 20 abuts against the valve assembly 40 to close the second exhaust port 23 on the airflow channel 21, and at this time, the exhaust channel is disconnected from the first cavity 32 and the first exhaust port 12 (this state is set as the valve closed, in which the valve stem 20 is in the first position, and when the gearbox shifts, the lock pin 81 can move up and down);

[0065] When high-pressure gas is introduced into the first air inlet 11, the high-pressure gas enters the airflow channel 21 through the first air inlet 11 and the second air inlet 22. Under the pressure of the high-pressure gas, the valve stem 20 moves in the first direction away from the valve assembly 40 to the second position. When the valve stem 20 is in the second position, the valve stem 20 is separated from the valve assembly 40, so that the second exhaust port 23 of the airflow channel 21 is connected to the first exhaust port 12 through the first cavity 32 (this state is set as the valve is open, in which the valve stem 20 is in the second position, restricting the movement of the lock pin 81, so that the gearbox cannot shift gears);

[0066] In one embodiment of the present application, a first overflow channel 14 is further formed on the valve body 10, the first overflow channel 14 is communicated with the first air inlet 11, and the first overflow channel 14 has a third exhaust port 141, the third exhaust port 141 is used for the first overflow channel 14 to communicate with the outside, and a first steel ball 15 is provided in the first overflow channel 14, and the first overflow channel 14 is used to connect the first air inlet 11 with the second air inlet 22;

[0067] The first steel ball 15 plays a blocking role to prevent the first air inlet 11 from being directly connected to the atmosphere;

[0068] In one embodiment of the application, the neutral protection valve further includes a first elastic reset member 50, the first elastic reset member 50 is located in the first accommodating chamber 13, and one end of the first elastic reset member 50 abuts against the valve stem 20, and the other end of the first elastic reset member 50 abuts against the valve body 10. After the high-pressure gas is withdrawn, under the action of the elastic force of the first elastic reset member 50, the first elastic reset member 50 drives the valve stem 20 to move from the second position to the first position;

[0069] Specifically, in the application, the first elastic return member 50 is a spring;

[0070] In one implementation of the application, the valve assembly 40 includes a sealing member 41, a gasket 42, an elastic member 43 and a fixing seat 44;

[0071] Specifically, the first accommodating cavity 13 has a first opening 131, and the first opening 131 is located at one end of the first accommodating cavity 13 away from the first elastic return member 50. The fixing seat 44 is connected to the first opening 131. A second sealing ring 45 is provided between the fixing seat 44 and the first opening 131, and a first hole elastic retaining ring 46 is provided on the outer side of the fixing seat 44 to prevent the fixing seat 44 from falling off from the first opening 131.

[0072] A receiving hole 411 is formed on the sealing member 41, and the receiving hole 411 penetrates the sealing member 41 along a first direction;

[0073] Prevent the valve assembly 40 from being driven by the valve stem 20, and the elastic member 43 from forming a closed state in the receiving hole 411;

[0074] The diameter of the accommodating hole 411 is less than or equal to the diameter of the second exhaust port 23, and an abutting portion 412 is convexly provided on the inner wall of the accommodating hole 411. The sealing member 41 is slidably connected to the fixing seat 44, and the gasket 1 42 is disposed between the sealing member 41 and the fixing seat 44. One end of the elastic member 43 abuts against the abutting portion 412, and the other end abuts against the fixing seat 44;

[0075] When the valve stem 20 is in the first position, under the combined action of the first elastic reset member 50 and the elastic member 43, the valve stem 20 is butted against the sealing member 41;

[0076] When the valve stem 20 moves from the first position to the second position under the action of the high-pressure gas pressure, the sealing member 41 moves toward the valve stem 20 driven by the elastic member 43 (in this movement, it abuts against the valve seat 60, and the first air inlet 11 and the first air outlet 12 are ventilated);

[0077] In one embodiment of the present application, the valve assembly 40 further includes an elastic gasket 47 , which is disposed on a side of the sealing member 41 facing the valve stem 20 and is located outside the accommodating hole 411 ;

[0078] When the valve stem 20 is located at the first position, the valve stem 20 abuts against the elastic washer 47 .

[0079] Specifically, the elastic member 43 is a spring;

[0080] In one implementation of the present application, the neutral protection valve further includes a valve seat 60, which is fixedly connected to the inside of the first accommodating chamber 13 and sleeved on the outside of the valve stem 20, and a third sealing ring 63 is provided between the valve seat 60 and the first accommodating chamber 13, and the inner wall of the valve seat 60 is spaced from the valve stem 20. A limiting ring 61 is provided on the valve seat 60, and the limiting ring 61 is convexly provided on the inner wall of the valve seat 60. When the sealing member 41 moves toward the valve stem 20 under the drive of the elastic member 43, the sealing member 41 abuts against the limiting ring 61 to limit the movement of the valve seat 60 from the first position to the second position;

[0081] In one embodiment of the present application, the neutral protection valve further includes an exhaust mechanism 70, and the exhaust mechanism 70 includes an exhaust chamber 16, an exhaust seat 71, a dust cover 72 and a gasket 2 74;

[0082] The exhaust cavity 16 is formed in the valve body 10, and the exhaust cavity 16 extends along the first direction. The valve seat 60 is formed with a second cavity 62, and the second cavity 62 is communicated with the first cavity 32 and the exhaust cavity 16, so that the exhaust cavity 16 is communicated with the first cavity 32. The exhaust cavity 16 has a second opening 161, and the second opening 161 and the first opening 131 are both on the same side of the valve body 10. The exhaust seat 71 is installed on the second opening 161, and a fourth sealing ring 75 is provided between the exhaust seat 71 and the second opening 161, and a second hole elastic ring 76 is installed in the second opening 161 to prevent the exhaust seat 71 from falling off from the second opening 161;

[0083] An exhaust port 711 is formed on the exhaust seat 71. The exhaust port 711 is used to connect the exhaust cavity 16 with the outside. There are multiple exhaust ports 711, which are evenly distributed along the axial direction of the exhaust seat 71.

[0084] The dust cover 72 is connected to the side of the exhaust seat 71 away from the exhaust chamber 16 by a rivet 77, and the gasket 2 74 is connected between the dust cover 72 and the exhaust seat 71 to close the exhaust port;

[0085] In one implementation of the present application, a second overflow channel 17 is further formed on the valve body 10, and the second overflow channel 17 is communicated with the exhaust chamber 16, and the first overflow channel 14 has a fourth exhaust port 171, and the fourth exhaust port 171 is used for the second overflow channel 17 to communicate with the outside, and a second steel ball 18 is arranged in the second overflow channel 17, and the second cavity 62 is connected to the exhaust chamber 16, wherein the second steel ball 18 plays a blocking and sealing role to prevent the exhaust chamber 16 from being directly connected to the external atmosphere;

[0086] In one embodiment of the present application, the neutral protection valve further includes a lock pin 81, a second elastic reset member 82 and a limit member 83;

[0087] A second accommodating chamber 19 is formed on the valve body 10. The second accommodating chamber 19 extends along the second direction and is communicated with the first accommodating chamber 13. The locking pin 81 is slidably connected in the second accommodating chamber 19. The locking pin 81 slides relative to the second accommodating chamber 19 along the second direction.

[0088] The second elastic reset member 82 is accommodated in the second accommodating chamber 19, the bottom end of the second elastic reset member 82 abuts against the valve body 10, the top end of the second elastic reset member 82 abuts against the lock pin 81, and the limit member 83 is connected to the second accommodating chamber 19, and is used to limit the movement of the lock pin 81 along the second direction. This movement is used to push the lock pin 81 to move downward when the gearbox shifts, and drive the transition pin 84 to move rightward;

[0089] It should be noted that the first direction and the second direction are perpendicular to each other;

[0090] Specifically, the second elastic reset member 82 is a spring;

[0091] In one embodiment of the present application, the neutral protection valve also includes a transition pin 84, which is slidably connected to the valve body 10 along the second direction; a receiving groove 811 is formed on the lock pin 81, and the transition pin 84 passes through the valve seat 60 and is adapted to the receiving groove 811.

[0092] The transition pin 84 has a transition function. When the transition pin 84 moves to the right, the signal switch is disconnected.

[0093] In one embodiment of the present application, the neutral protection valve also includes a connecting seat 91 and a push rod 92. The connecting seat 91 is connected to the valve body 10. A through hole 911 is formed on the connecting seat 91. The through hole 911 penetrates the connecting seat 91 along the second direction, and the through hole 911 corresponds to the second accommodating chamber 19; the push rod 92 is slidably connected in the through hole 911 along the second direction, and abuts against one end of the locking pin 81 away from the second elastic return member 82. The push rod 92 is a transition rod. When the gearbox shifts, it drives the push rod 92 and then drives the locking pin 81.

[0094] According to the above embodiments, the working principle of the present invention is:

[0095] Technical parameter description of the neutral protection valve in the present invention:

[0096] Working air pressure 1.0MPa, valve body diameter 1 / 4, air inlet thread M10×1, guide point compression stroke 4±0.2; design life 500,000 times, working temperature -30℃~80℃.

[0097] (After turning on the two-way protection function) Function introduction: When the transmission is in neutral, the neutral protection valve collects the neutral position signal, turns on the neutral signal switch, and at the same time connects the air path behind the power take-off control solenoid valve. If the power take-off works, the transmission is locked in neutral to prevent the transmission from being re-engaged in gear by mistake;

[0098] If the transmission is not in neutral, even if the power take-off solenoid valve is turned on, the neutral protection valve will not connect the power take-off control air circuit because the neutral protection valve has not collected the neutral signal, and the power take-off will still not work. Function: Reduce the gear-snagging of the power take-off caused by misoperation, and prevent the synchronization difficulty of the synchronizer caused by the transmission shifting during the power take-off operation, which will accelerate the damage;

[0099] Serial number project Design parameters 1 Working air pressure / MPa 0.4～1.1 2 Working environment temperature / ℃ -30～+60 3 PTO drive capacity / Ncm 30 4 Air inlet thread specifications M10×1, depth 12 5 Outlet thread specifications M10×1, depth 12

[0100] When the vehicle is in neutral, the neutral protection valve begins to play its core function. First, the valve body 10, as the main body of the entire valve, carries various components and ensures their stable connection. The valve stem 20, as a control component, directly affects the opening and closing of the valve by its movement state. In this state, the valve stem 20 is in its first position. At this time, the sealing member 41 is tightly fitted to the limiting ring 61 of the valve seat 60 under the action of the elastic member 43, thereby ensuring the tight closing state of the valve to prevent gas leakage.

[0101] At this time, since the neutral signal is correctly identified, the neutral signal switch inside the neutral protection valve is in the on state; this means that the solenoid valve air path related to the power take-off control is unblocked; if the power take-off needs to be enabled at this time, the signal controlling the solenoid valve can be transmitted smoothly, and the power take-off can work normally; but it is worth noting that due to the existence of the neutral protection valve, even if the power take-off solenoid valve is opened, if the transmission is not in the neutral state, the neutral protection valve will not connect the control air path of the power take-off, thereby ensuring that the power take-off cannot work; this can effectively prevent the power take-off from starting when the transmission is not in the neutral state due to misoperation, thereby avoiding the possible gear knocking phenomenon, and also protecting the transmission synchronizer from damage;

[0102] In addition, the existence of the exhaust mechanism 70 ensures the balance of air pressure inside the neutral protection valve; when the valve needs to be opened or closed, the exhaust mechanism 70 can timely discharge the excess gas inside, ensuring the smooth movement of the valve; and the lock pin 81, the second elastic reset member 82 and the limit member 83 and other components in the second accommodating chamber 19 constitute another important part of the neutral protection valve - the locking mechanism; the existence of this mechanism ensures that in certain circumstances, such as when the vehicle has an accident or an emergency operation is required, the control air path of the power take-off can be quickly and accurately cut off, thereby ensuring the safety of the vehicle and personnel;

[0103] To sum up, the neutral protection valve in the present application, through its unique design and working principle, realizes effective control of the power take-off in the non-neutral state of the transmission, effectively prevents equipment damage and personal injury caused by misoperation, and improves the safety and reliability of the vehicle.

[0104] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0105] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. Neutral protection valve, characterized in that: include: A valve body (10) is formed with a first air inlet (11) and a first air outlet (12), and the valve body (10) is also formed with a first accommodating cavity (13) extending along a first direction; a valve stem (20) slidably connected to the inside of the first accommodating chamber (13), and the valve stem (20) slides relative to the first accommodating chamber (13) along the first direction, the valve stem (20) has a first position and a second position, an air flow channel (21) is formed in the valve stem (20), the air flow channel (21) passes through the valve stem (20), and the air flow channel (21) is communicated with the first air inlet (11); a spacer sleeve (30) fixedly connected to the first accommodating cavity (13) and sleeved on the valve stem (20); a first cavity (32) is formed on the spacer sleeve (30); the first cavity (32) is communicated with the first exhaust port (12); A valve assembly (40) is slidably connected in the first accommodating chamber (13); When the valve stem (20) is in the first position, the valve stem (20) abuts against the valve assembly (40) to close the air flow channel (21); when the valve stem (20) is in the second position, the valve stem (20) and the valve assembly (40) are separated to allow the air flow channel (21) to communicate with the first exhaust port (12).

2. The neutral protection valve according to claim 1, characterized in that: A first elastic return member (50) is provided in the first accommodating chamber (13), and one end of the first elastic return member (50) abuts against the valve stem (20), and the other end abuts against the valve body (10), so as to drive the valve stem (20) to move from the second position to the first position.

3. The neutral protection valve according to claim 2, characterized in that: A sealing member (41) and an elastic member (43) are slidably connected in the first accommodating cavity (13); when the valve stem (20) is located in the first position, the sealing member (41) abuts against the valve stem (20); the elastic member (43) is located in the first accommodating cavity (13), the elastic member (43) abuts against the sealing member (41); and the sealing member (41) abuts against the valve stem (20) under the action of the elastic force of the elastic member (43).

4. The neutral protection valve according to claim 3, characterized in that: The neutral protection valve further comprises: a fixing seat (44); the first accommodating chamber (13) has a first opening (131), the fixing seat (44) is connected to the first opening (131), and one end of the elastic member (43) away from the sealing member (41) abuts against the fixing seat (44).

5. The neutral protection valve according to claim 1, characterized in that: The neutral protection valve further comprises: a valve seat (60) fixedly connected to the interior of the first accommodating chamber (13) and sleeved on the outer side of the valve stem (20), and an inner wall of the valve seat (60) is spaced from the valve stem (20); The valve seat (60) is provided with a limiting ring (61), the limiting ring (61) being protruding from the inner wall of the valve seat (60), and the limiting ring (61) being used to limit the movement of the valve seat (60) in the direction from the first position to the second position.

6. The neutral protection valve according to claim 5, characterized in that: The neutral protection valve further comprises an exhaust mechanism (70), wherein the exhaust mechanism (70) comprises: an exhaust cavity (16) formed in the valve body (10), the exhaust cavity (16) being in communication with the first cavity (32), and the exhaust cavity (16) having a second opening (161); An exhaust seat (71), wherein a third exhaust port (141) is formed on the exhaust seat (71), and the third exhaust port (141) is used for connecting the exhaust chamber (16) with the outside; A dust cover (72) connected to a side of the exhaust seat (71) facing away from the exhaust chamber (16); A gasket is connected between the dust cover (72) and the exhaust seat (71) and is used to close the third exhaust port (141).

7. The neutral protection valve according to claim 6, characterized in that: A second cavity (62) is formed on the valve seat (60), and the second cavity (62) is communicated with the first cavity (32) and the exhaust cavity (16).

8. The neutral protection valve according to claim 7, characterized in that: The neutral protection valve further comprises: a lock pin (81); a second accommodating chamber (19) is formed on the valve body (10); the second accommodating chamber (19) extends along a second direction, and the second accommodating chamber (19) is communicated with the first accommodating chamber (13); the lock pin (81) is slidably connected in the second accommodating chamber (19), and the lock pin (81) slides relative to the first accommodating chamber (13) along the second direction; A second elastic return member (82) is accommodated in the second accommodating cavity (19) and abuts against the locking pin (81); a limiting member (83), connected to the second accommodating cavity (19), and used for limiting the movement of the locking pin (81) along the second direction; The first direction and the second direction are perpendicular to each other.

9. The neutral protection valve according to claim 8, characterized in that: The neutral protection valve further comprises: a transition pin (84) slidably connected to the valve body (10) along a second direction; The lock pin (81) is formed with a receiving groove (811), and the transition pin (84) penetrates the valve seat (60) and is adapted to fit in the receiving groove (811).

10. The neutral protection valve according to claim 9, characterized in that: The neutral protection valve further comprises: a connecting seat (91) connected to the valve body (10), a through hole (911) being formed on the connecting seat (91), the through hole (911) penetrating the connecting seat (91) along the second direction, and the through hole (911) corresponding to the second accommodating cavity (19); The push rod (92) is slidably connected in the through hole (911) along the second direction, and abuts against an end of the locking pin (81) away from the second elastic return member (82).

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