A welding-free brushless linear motor driven poppet valve

Abstract

The present invention discloses a non-welded lift valve driven by a brushless linear motor, comprising a valve body with a hollow cavity inside, an air inlet and an air outlet at the bottom of the valve body; a brushless linear motor is arranged at the top of the valve body, and the output shaft end of the brushless linear motor is connected to a center rod and a valve core riveted to the bottom end of the center rod through a transition connection structure; the transition connection structure comprises a drive block fixed to the output shaft end of the brushless linear motor and a coupling matched with the drive block and riveted to the center rod. The present invention adopts a brushless linear motor as the actuator power source, which simplifies the design structure. The center rod and the valve core are riveted and fixed, and the coupling and the center rod are riveted and fixed, which avoids the risk of weld falling off caused by welding; the output shaft of the brushless linear motor is connected to the center rod by a coupling and a drive block, and the brushless linear motor will not be damaged during the assembly process.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts. Background Art

[0002] Most internal combustion engines have poppet valves as inlet and exhaust valves, sometimes called poppet valves, poppet valves or mushroom valves, which control the flow of air into the combustion chamber of the internal combustion engine and the flow of burned gas out. Usually, the poppet valve is operated by a cam on a rotating camshaft. In large diesel engines, when the exhaust valve is open, the residual pressure in the combustion chamber can reach 70 bar. This requires considerable force to be applied to the exhaust valve.

[0003] With the upgrading of emission regulations, control systems are becoming increasingly complex, and higher requirements are placed on the response speed, accuracy and size of actuators. Most of the existing lift valve actuator power sources use DC brush motors. DC brush motors have become the first choice for various actuator power sources due to their small size, simple structure and simple control. However, DC brush motors have two disadvantages: the first is the wear of the brushes. After a period of use, the carbon brushes of DC brush motors will be severely worn, which limits the service life of the product; the second is the size. Ordinary motors are all rotary motions, and they require a set of structures to convert rotary motion into linear motion. A conversion mechanism is required, which inevitably leads to the complexity of the structure.

[0004] The center rod of the existing lifting valve is connected to the valve core or other components by welding. After long-term use, it is easy to fall off under the continuous impact of high-temperature gas. It is necessary to regularly inspect the interior of the lifting valve and replace the fallen parts.

[0005] In addition, when the motor output shaft and the center rod of the poppet valve are not aligned after installation, it is easy for the motor output shaft, the center rod or other components to be damaged, causing the interior of the poppet valve to be damaged prematurely. For this reason, the center rod of the poppet valve requires high installation accuracy during installation, which undoubtedly increases the labor intensity of the staff. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a lifting valve driven by a brushless linear motor without welding, so as to solve the problems that the existing lifting valve adopts a DC brush motor, which limits the service life of the product and complicates the structure, the problem that the center rod and the valve core are easily detached, and the problem that the motor output shaft and the center rod of the lifting valve are not coaxial after installation, which easily causes damage to the motor output shaft, the center rod or other components, so as to increase the service life of the lifting valve and simplify the internal structure of the lifting valve so that the center rod of the lifting valve does not require very high installation accuracy during installation, so as to ensure that the center rod of the lifting valve will not be damaged prematurely.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0008] A non-welded lifting valve driven by a brushless linear motor comprises a valve body with a hollow cavity inside, an air inlet and an air outlet being provided at the bottom of the valve body; a brushless linear motor is arranged at the top of the valve body, and an output shaft end of the brushless linear motor is connected to a center rod passing through the hollow cavity of the valve body through a transition connection structure, and a valve core riveted at the bottom end of the center rod for controlling the on-off between the air inlet and the air outlet under the drive of the brushless linear motor; the transition connection structure comprises a driving block fixed to the output shaft end of the brushless linear motor, and a coupling matched with the driving block and riveted to the center rod for avoiding the problem of premature damage of components when the output shaft of the brushless linear motor is not coaxial with the center rod.

[0009] To further optimize the technical solution, the center rod is arranged in a stepped shaft shape, and the center rod is arranged from top to bottom in sequence as a first stepped shaft, a second stepped shaft, a third stepped shaft and a fourth stepped shaft, a first riveting step is provided at the junction of the first stepped shaft and the second stepped shaft for facilitating riveting support when riveting the coupling, and a second riveting step is provided at the junction of the third stepped shaft and the fourth stepped shaft for facilitating riveting support when riveting the valve core.

[0010] To further optimize the technical solution, an annular protrusion is provided on the outer wall of the driving block, and a connecting groove matching the annular protrusion is provided on the coupling.

[0011] To further optimize the technical solution, the valve core is a flat cover plate, the outer diameter of the valve core is larger than the inner diameter of the air inlet, and the outer diameter of the valve core is smaller than the inner diameter of the air outlet.

[0012] To further optimize the technical solution, a limiting protrusion is also provided downward on the valve body located directly below the brushless linear motor to limit the position of the drive block and the coupling to ensure that the output shaft of the brushless linear motor can extend to a certain length.

[0013] To further optimize the technical solution, a stepped hole connected to the air inlet is provided in the valve body, the stepped holes include a first stepped hole, a second stepped hole and a third stepped hole sequentially provided in the valve body from top to bottom, and the air inlet is connected to the air outlet.

[0014] To further optimize the technical solution, a return structure is provided in the first step hole for ensuring that the center rod and the valve core return to their original positions after the brushless linear motor control fails; the return structure includes a return spring which is sleeved on the periphery of the center rod, one end of which is fixed to the bottom end of the coupling and the other end of which is fixed to the inner wall of the first step hole.

[0015] To further optimize the technical solution, a sealing guide structure for sealing and guiding the center rod is provided in the second step hole and the third step hole.

[0016] To further optimize the technical solution, the sealing guide structure includes a sealing ring embedded in the second step hole to prevent high-temperature gas from rising and to avoid damage to the brushless linear motor due to overtemperature, and a guide sleeve embedded in the second step hole and located directly below the sealing ring to guide the center rod. The center rod passes through the sealing ring and is slidingly sealed with the sealing ring, and the center rod passes through the guide sleeve.

[0017] To further optimize the technical solution, the guide sleeve is stepped, the lower part of the guide sleeve is arranged in the third step hole, and a scraper is fixedly arranged at the bottom end of the guide sleeve for removing carbon soot particles attached to the center rod when the center rod moves up and down to ensure that the lifting valve will not get stuck. The bottom of the scraper is bent inward and has a certain gap with the center rod.

[0018] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0019] The present invention adopts a brushless linear motor that does not require any additional mechanism and directly outputs linear motion as the actuator power source, eliminates the conversion mechanism, simplifies the design structure, greatly reduces the cost, greatly simplifies the difficulty of structural design, and increases the reliability of the product. The center rod and the valve core of the present invention are riveted and fixed, and the coupling and the center rod are riveted and fixed, avoiding the risk of weld seam falling off caused by welding; the output shaft of the brushless linear motor is connected to the center rod by a coupling and a drive block, which is simple to assemble and will not cause damage to the brushless linear motor during the assembly process, avoiding the problem of premature damage to the motor and parts caused by the misalignment of the brushless linear motor and the center rod, and having obvious cost advantages; the mechanical limit of the coupling by the set limit protrusion reaches the initial working position of the brushless linear motor, and the consistency is good.

[0020] The coupling of the present invention also serves as a spring seat, and the return spring is installed between the coupling and the valve body, which can ensure that the valve core can return to the initial position when the brushless linear motor is abnormally powered off.

[0021] The limiting protrusion provided in the present invention is used to limit the position of the driving block and the coupling, ensuring that the output shaft of the brushless linear motor can extend to a certain length. Because the brushless linear motor has the characteristics that the torque at the starting position is very small, it must be extended to a certain distance to reach the working torque. The brushless linear motor is extended to a certain length during installation, and the limiting protrusion is provided so that the top surface of the driving block and the coupling of the brushless linear motor is in contact with the limiting protrusion in the initial position, so that the output shaft of the brushless linear motor can extend to a certain length in the initial position, and the starting position of the brushless linear motor is mechanically limited, and the starting working position of the brushless linear motor is accurately positioned, ensuring the consistency of the lifting valve product.

[0022] A scraper is fixedly arranged on the guide sleeve of the present invention. Due to the arrangement of the scraper, the present invention can perform a scraping operation on the center rod during use, and particulate matter such as carbon smoke attached to the center rod can be removed in time, which not only ensures that the lifting valve will not get stuck, but also prolongs the service life of the lifting valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the present invention;

[0024] Figure 2 A schematic diagram of the structure of the brushless linear motor and the drive block when installed in the present invention;

[0025] Figure 3 A schematic diagram of the structure of the center rod and the valve core when they are installed;

[0026] Figure 4 A schematic diagram of the structure of the center rod, valve core and coupling when installed to the valve body of the present invention;

[0027] Figure 5 A schematic diagram of the structure of the center rod and the coupling when riveted together;

[0028] Figure 6 A schematic structural diagram of the brushless linear motor of the present invention driving a center rod to rotate via a coupling.

[0029] Among them: 1. brushless linear motor, 2. drive block, 21. annular protrusion, 3. coupling, 31. connecting slot, 4. sealing ring, 5. guide sleeve, 6. scraper, 7. valve core, 8. return spring, 9. valve body, 91. air inlet, 92. air outlet, 93. stepped hole, 10. center rod, 101. first riveting step, 102. second riveting step, 11. limiting protrusion. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with specific inventions.

[0031] A welding-free brushless linear motor driven poppet valve, combined with Figures 1 to 6 As shown, it includes a valve body 9, a brushless linear motor 1, a center rod 10, a valve core 7 and a transition connection structure.

[0032] The interior of the valve body 9 is in the shape of a hollow cavity, and an air inlet 91 and an air outlet 92 are formed at the bottom of the valve body 9 .

[0033] The brushless linear motor 1 is arranged at the top of the valve body 9. The output shaft end of the brushless linear motor 1 is connected with a center rod 10 through a transition connection structure, and the center rod 10 passes through the hollow cavity of the valve body 9. Both the valve body 9 and the brushless linear motor 1 are provided with positioning pin holes, and the motor positioning pins are inserted into the positioning pin holes on the valve body 9 and the brushless linear motor 1 to achieve the locking and positioning of the brushless linear motor 1.

[0034] The brushless linear motor 1 in the present invention is a mechatronic product, which not only eliminates the brush structure, but also directly outputs linear motion, and is very suitable for the application of lift valves, and has the characteristics of low cost, long life, high reliability, etc. The brushless linear motor 1 in the present invention adopts a KYAC 2000 linear motor, and other types of linear motors may also be used.

[0035] The center rod 10 is configured as a stepped shaft, and the center rod 10 is configured as a first stepped shaft, a second stepped shaft, a third stepped shaft, and a fourth stepped shaft from top to bottom. A first riveting step 101 is provided at the junction of the first stepped shaft and the second stepped shaft, and the first riveting step 101 is used for riveting support when riveting the coupling 3. A second riveting step 102 is provided at the junction of the third stepped shaft and the fourth stepped shaft, and the second riveting step 102 is used for riveting support when riveting the valve core 7.

[0036] The valve core 7 is riveted to the bottom end of the center rod 10 and is used to control the on / off between the air inlet 91 and the air outlet 92 when driven by the brushless linear motor 1 .

[0037] The valve core 7 is a flat cover plate, and the outer diameter of the valve core 7 is larger than the inner diameter of the air inlet 91 , and the outer diameter of the valve core 7 is smaller than the inner diameter of the air outlet 92 .

[0038] The transition connection structure includes a drive block 2 and a coupling 3. The drive block 2 is fixed to the output shaft end of the brushless linear motor 1. The coupling 3 is matched with the drive block 2 and riveted to the center rod 10 to avoid premature damage to the components when the output shaft of the brushless linear motor 1 is not aligned with the center rod 10.

[0039] An annular protrusion 21 is provided on the outer wall of the driving block 2 , and a connecting groove 31 matched with the annular protrusion 21 is provided on the coupling 3 .

[0040] A limiting protrusion 11 is also provided downward on the valve body 9 located directly below the brushless linear motor 1. The limiting protrusion 11 is used to limit the position of the drive block 2 and the coupling 3 to ensure that the output shaft of the brushless linear motor 1 can be extended to a certain length. Because the brushless linear motor has the characteristics that the torque at the initial position is very small, it must be extended a certain distance to reach the working torque. The brushless linear motor is extended to a certain length during installation, and the limiting protrusion 11 is provided so that the top surfaces of the drive block 2 and the coupling 3 are in contact with the limiting protrusion 11 when the brushless linear motor is in the initial position, so that the output shaft of the brushless linear motor can be extended to a certain length in the initial position.

[0041] A stepped hole 93 connected to the air inlet 91 is formed in the valve body 9 . The stepped hole 93 includes a first stepped hole, a second stepped hole and a third stepped hole formed in the valve body 9 from top to bottom. The air inlet 91 is connected to the air outlet 92 .

[0042] A return structure is provided in the first stepped hole, and the return structure is used to ensure that the center rod 10 and the valve core 7 return to their original positions after the control of the brushless linear motor 1 fails.

[0043] The return structure includes a return spring 8, which is sleeved on the periphery of the central rod 10, one end of the return spring 8 is fixed to the bottom end of the coupling 3 and the other end is fixed to the inner wall of the first stepped hole.

[0044] The setting of the return spring 8 can ensure that the valve core 7 can return to the initial position when the electrical control fails.

[0045] The coupling of the present invention also serves as a spring seat, and the return spring is installed between the coupling and the valve body, which can ensure that the valve core can return to the initial position when the brushless linear motor is abnormally powered off.

[0046] A sealing guide structure is provided in the second step hole and the third step hole, and the sealing guide structure is used to perform a sealing function and guide the center rod 10 .

[0047] The sealing guide structure includes a sealing ring 4 and a guide sleeve 5. The sealing ring 4 is embedded in the second stepped hole to prevent the high-temperature gas from rising, so as to avoid the brushless linear motor 1 from being damaged due to excessive temperature. The guide sleeve 5 is embedded in the second stepped hole and is located directly below the sealing ring 4. It is used to guide the center rod 10. The guide sleeve 5 is set to ensure that the center rod 10 can always move in the vertical direction. The center rod 10 passes through the sealing ring 4 and is slidingly sealed with the sealing ring 4. The center rod 10 passes through the guide sleeve 5.

[0048] The guide sleeve 5 is stepped, and the lower part of the guide sleeve 5 is arranged in the third step hole. A scraper 6 is fixedly arranged at the bottom end of the guide sleeve 5. The scraper 6 is used to remove carbon soot particles attached to the center rod 10 when the center rod 10 moves up and down to ensure that the lifting valve will not get stuck. The bottom of the scraper 6 is bent inward and has a certain gap with the center rod 10.

[0049] In addition, the present invention is also provided with a position sensor for detecting the motion position of the output shaft of the brushless linear motor 1 and a control unit for receiving the position sensor signal and controlling the brushless linear motor 1. The control unit adopts a 51 single chip microcomputer. The controlled end of the brushless linear motor 1 is connected to the output end of the control unit, and the output end of the position sensor is connected to the input end of the control unit.

[0050] The actual assembly process of the present invention is as follows.

[0051] First, install the drive block 2 onto the output shaft of the brushless linear motor 1, and combine Figure 2 After the valve core 7 is installed into the center rod 10, they are riveted together to form a connection. Figure 3 shown.

[0052] Next, install the scraper 6, guide sleeve 5, and seal ring 4 into the valve body 9 in sequence. Install the center rod assembly into the valve body 9, insert the return spring 8, and fix the return spring 8. Install the coupling 3, and press the coupling 3 and the center rod 10 together. The center rod 10 is processed with a first press riveting step 101 for press riveting support. Figure 5 shown.

[0053] Finally, install the brushless linear motor 1 assembly, manually pull out the output shaft of the brushless linear motor 1, install the drive block 2 into the coupling 3, insert the motor locating pin into the locating pin holes on the valve body 9 and the brushless linear motor 1, tighten the screws, and position the brushless linear motor 1 on the valve body 9.

[0054] When the present invention is actually used, the output shaft of the brushless linear motor 1 drives the driving block 2, the coupling 3 and the center rod 10 to move up and down, and then drives the valve core 7 to move up and down, and controls the on-off between the air inlet 91 and the air outlet 92 of the valve body 9. While the output shaft of the brushless linear motor 1 moves up and down, the position sensor transmits the detection signal to the control unit. When the center rod 10 moves up and down, the scraper 6 can remove particulate matter such as carbon soot attached to the output shaft of the brushless linear motor 1 to ensure that the valve body will not get stuck.

[0055] The present invention uses a brushless linear motor 1 that does not require any additional mechanism and directly outputs linear motion as the actuator power source. It is very suitable for applications of lift valves and has the characteristics of low cost, long life, and high reliability. The advantages of the present invention include: 1. The motor output shaft directly outputs linear motion, eliminating the conversion mechanism, and achieving a win-win situation in terms of cost and reliability; 2. The center rod 10 and the valve core 7 are riveted and fixed to avoid the risk of weld falling off caused by welding; 3. The coupling 3 and the drive block 2 are used to connect the output shaft of the brushless linear motor 1 to the center rod 10, which is simple to assemble and will not cause damage to the brushless linear motor 1 during the assembly process, with obvious cost advantages; 4. Through mechanical limiting, the brushless linear motor 1 reaches its initial working position with good consistency.

Claims

1. A non-welded brushless linear motor driven poppet valve, comprising a valve body (9) with a hollow cavity inside, an air inlet (91) and an air outlet (92) being provided at the bottom of the valve body (9); characterized in that: A brushless linear motor (1) is disposed at the top end of the valve body (9); the output shaft end of the brushless linear motor (1) is connected to a center rod (10) passing through the hollow cavity of the valve body (9) through a transition connection structure, and a valve core (7) riveted to the bottom end of the center rod (10) for controlling the opening and closing between the air inlet (91) and the air outlet (92) under the drive of the brushless linear motor (1); the transition connection structure comprises a drive block (2) fixed to the output shaft end of the brushless linear motor (1) and a riveted chain matched with the drive block (2) and connected to the center rod (10). A coupling (3) is connected to avoid the problem of premature damage to components caused by the misalignment of the output shaft of the brushless linear motor (1) and the center rod (10); an annular protrusion (21) is arranged on the outer wall of the driving block (2); a connecting slot (31) matched with the annular protrusion (21) is opened on the coupling (3); and a limiting protrusion (11) is also arranged downward on the valve body (9) located directly below the brushless linear motor (1) for limiting the position of the driving block (2) and the coupling (3) to ensure that the output shaft of the brushless linear motor (1) can extend to a certain length.

2. A welding-free brushless linear motor driven poppet valve according to claim 1, characterized in that: The center rod (10) is configured in a stepped shaft shape. The center rod (10) is sequentially configured from top to bottom as a first stepped shaft, a second stepped shaft, a third stepped shaft and a fourth stepped shaft. A first riveting step (101) is provided at the junction of the first stepped shaft and the second stepped shaft for facilitating riveting support when riveting the coupling (3). A second riveting step (102) is provided at the junction of the third stepped shaft and the fourth stepped shaft for facilitating riveting support when riveting the valve core (7).

3. A welding-free brushless linear motor driven poppet valve according to claim 1, characterized in that: The valve core (7) is a flat cover plate, the outer diameter of the valve core (7) is larger than the inner diameter of the air inlet (91), and the outer diameter of the valve core (7) is smaller than the inner diameter of the air outlet (92).

4. A welding-free brushless linear motor driven poppet valve according to claim 1, characterized in that: The valve body (9) is provided with a stepped hole (93) connected to the air inlet (91), the stepped hole (93) comprising a first stepped hole, a second stepped hole and a third stepped hole which are sequentially provided in the valve body (9) from top to bottom, and the air inlet (91) is connected to the air outlet (92).

5. A welding-free brushless linear motor driven poppet valve according to claim 4, characterized in that: A return structure is provided in the first stepped hole for ensuring that the center rod (10) and the valve core (7) return to their original positions after the control of the brushless linear motor (1) fails; the return structure comprises a return spring (8) which is sleeved on the periphery of the center rod (10), one end of which is fixed to the bottom end of the coupling (3) and the other end of which is fixed to the inner wall of the first stepped hole.

6. A welding-free brushless linear motor driven poppet valve according to claim 4, characterized in that: The second stepped hole and the third stepped hole are provided with sealing guide structures for sealing and guiding the center rod (10).

7. A welding-free brushless linear motor driven poppet valve according to claim 6, characterized in that: The sealing guide structure comprises a sealing ring (4) embedded in the second stepped hole for preventing high-temperature gas from rising to avoid damage to the brushless linear motor (1) due to excessive temperature, and a guide sleeve (5) embedded in the second stepped hole and located directly below the sealing ring (4) for guiding the center rod (10). The center rod (10) passes through the sealing ring (4) and is slidably sealed with the sealing ring (4). The center rod (10) passes through the guide sleeve (5).

8. A welding-free brushless linear motor driven poppet valve according to claim 7, characterized in that: The guide sleeve (5) is in a stepped shape, the lower part of the guide sleeve (5) is arranged in the third stepped hole, and a scraper (6) is fixedly arranged at the bottom end of the guide sleeve (5) for removing carbon smoke particles attached to the center rod (10) when the center rod (10) moves up and down to ensure that the lift valve will not be stuck, and the bottom of the scraper (6) is bent inwardly and has a certain gap with the center rod (10).

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