A valve device

Abstract

A valve device comprises a driving assembly and a valve core, the driving assembly is capable of driving the valve core to move; the driving assembly comprises a rotating shaft, a supporting part and a needle bearing; the supporting part has a mounting hole, the inner circumferential side of the needle bearing is fixedly connected with the rotating shaft or is connected with the rotating shaft in a circumferential limiting mode or is rolling fit, and the outer circumferential side of the needle bearing is fixedly connected with the wall forming the mounting hole or is connected with the wall in a circumferential limiting mode or is rolling fit; the needle bearing comprises a needle, and the axial direction of the needle is substantially parallel to the axial direction of the rotating shaft; in this way, the noise generated by the friction vibration during the rotation of the rotating shaft relative to the supporting part is reduced.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, specifically to a vehicle valve device. Background Technology

[0002] The valve device includes a drive assembly. In related technologies, the drive assembly's shaft rotates in conjunction with a support component. The sliding friction between the shaft and the support component generates noise. Therefore, it is necessary to design a valve device that can help reduce the noise generated during the rotation of the shaft relative to the support component. Utility Model Content

[0003] The purpose of this application is to provide a valve device that helps reduce the noise generated by friction during the rotation of the shaft relative to the supporting component.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A valve device includes a drive assembly and a valve core, the drive assembly being capable of driving the valve core to move; the drive assembly includes a rotating shaft, a support component, and a needle roller bearing; the support component has a mounting hole, the inner circumferential side of the needle roller bearing is fixedly connected to, circumferentially limited to, or roll-fitted with the rotating shaft, and the outer circumferential side of the needle roller bearing is fixedly connected to, circumferentially limited to, or roll-fitted with the wall forming the mounting hole; the needle roller bearing includes needles, the axial direction of which is substantially parallel to the axial direction of the rotating shaft.

[0006] In one technical solution provided in this application, the inner circumferential side of the needle roller bearing is fixedly connected to, circumferentially limited to, or roll-fitted with the rotating shaft, and the outer circumferential side of the needle roller bearing is fixedly connected to, circumferentially limited to, or roll-fitted with the wall forming the mounting hole. The needle roller bearing includes needles, the axial direction of which is approximately parallel to the axial direction of the rotating shaft. With this configuration, compared to technical solutions where the rotating shaft rotates relative to the wall forming the mounting hole, generating sliding friction, the rotating shaft in this solution overcomes the rolling friction generated by the rolling of the needles during rotation relative to the supporting component. The frictional force is smaller, which helps to reduce the noise generated by frictional vibration during the rotation of the rotating shaft relative to the supporting component. In addition, the axial direction of the needles is approximately parallel to the axial direction of the rotating shaft. With this configuration, compared to ball bearings, needle rollers can better limit the runout of the rotating shaft, which helps to reduce the degree of shaft runout. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the valve device provided in this application;

[0008] Figure 2 This is a cross-sectional structural diagram of the valve device;

[0009] Figure 3 yes Figure 2A magnified structural diagram at point A;

[0010] Figure 4 This is an exploded view of some parts of the drive assembly;

[0011] Figure 5 This is an exploded structural diagram of the first embodiment of the needle roller bearing;

[0012] Figure 6 This is an exploded structural diagram of the second embodiment of the needle roller bearing;

[0013] Figure 7 This is an exploded structural diagram of the third embodiment of the needle roller bearing;

[0014] Figure 8 This is an exploded structural diagram of the fourth embodiment of the needle roller bearing.

[0015] Figure label:

[0016] 1. Valve components; 2. Drive assembly; 3. Valve core; 4. Coil assembly;

[0017] 10. Valve body;

[0018] 21. Shaft; 22. Support component; 23. Needle roller bearing; 24. Cover plate; 25. Planetary gear assembly; 26. Magnetic rotor; 27. Connecting shaft;

[0019] 100. Valve assembly; 110. Valve chamber;

[0020] 210. Body section; 211. Stepped section; 221. Bearing housing; 222. Fixed gear ring; 231. Inner cylindrical section; 232. Outer cylindrical section; 233. Needle roller; 234. Extension section; 250. Gear;

[0021] 2210, Mounting hole; 2211, Protrusion; 2212, Limiting groove; 2213, Guide wall; 2214, Mounting wall; 2310, Internal receiving hole; 2320, External receiving hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] Combination Figures 1 to 8The diagram illustrates one embodiment of a valve device 100. In this embodiment, the valve device 100 includes a valve component 1, a drive assembly 2, a valve core 3, and a coil assembly 4. The valve component 1 has a valve cavity 110, with at least a portion of the valve core 3 located within the valve cavity 110. The coil assembly 4 is sleeved on the outside of the drive assembly 2, enabling the drive assembly 2 to drive at least a portion of the valve core 3 to move within the valve cavity 110. The drive assembly 2 includes a rotating shaft 21, a support component 22, and a needle roller bearing 23. The support component 22 has a mounting hole 2210. The inner circumferential side of the needle roller bearing 23 is fixedly connected to, circumferentially limited in connection with, or roll-fitted with the rotating shaft 21. The outer peripheral side of the needle roller bearing 23 is fixedly connected to the wall forming the mounting hole 2210, or circumferentially limited, or in a rolling fit; the needle roller bearing 23 includes needle rollers 233, the axial direction of which is approximately parallel to the axial direction of the rotating shaft 21; specifically, in this embodiment, the outer peripheral portion of the needle roller bearing 23 is fixedly disposed relative to the wall forming the mounting hole 2210, the inner peripheral side of the needle roller bearing 23 is rotatably fitted with the outer wall of the rotating shaft 21, the needle roller bearing 23 includes needle rollers 233, the inner peripheral portion of the needle roller bearing 23 includes the outer peripheral wall of the needle rollers 233, the needle rollers 233 can roll relative to the rotating shaft 21, and the outer peripheral wall of the needle rollers 233 is in clearance fit with the outer peripheral wall of the rotating shaft 21.

[0024] The inner circumferential side of the needle roller bearing 23 is fixedly connected to the rotating shaft 21, or circumferentially limited, or in a rolling fit. The outer circumferential side of the needle roller bearing 23 is fixedly connected to the wall forming the mounting hole 2210, or circumferentially limited, or in a rolling fit. The needle roller bearing 23 includes needles 233, the axial direction of which is approximately parallel to the axial direction of the rotating shaft 21. Compared to the technical solution where the rotating shaft 21 rotates in a rotating fit with the wall forming the mounting hole 2210, in this solution, the friction force overcome by the rotating shaft 21 during rotation is rolling friction. This helps to reduce the friction force overcome by the rotating shaft 21 during rotation, thereby reducing the vibration amplitude of the rotating shaft 21 or the needle roller bearing 23 caused by this friction force, and thus reducing the noise caused by the vibration of the rotating shaft 21 or the needle roller bearing 23.

[0025] Combination Figures 2 to 5 As shown, the needle roller bearing 23 includes needle rollers 233, which are cylindrical in structure, and the axial direction of the needle rollers 233 is approximately parallel to the axial direction of the rotating shaft 21. Specifically, there are multiple needle rollers 233, which are arranged circumferentially around the rotating shaft 21.

[0026] The needle roller 233 has a cylindrical structure, and its axial direction is approximately parallel to the axial direction of the rotating shaft 21. Compared to the technical solution of placing a ball bearing between the rotating shaft 21 and the wall forming the mounting hole 2210, the rolling surface of the cylindrical needle roller 233 in this solution is a line approximately parallel to the axial direction of the rotating shaft 21, resulting in a larger rolling contact surface. Compared to balls, the needle roller 233 can withstand a larger radial load and provides a certain degree of limit to the axial runout of the rotating shaft 21, which helps to reduce the risk of the rotating shaft 21 running out of control. Under the same load, the vibration amplitude of the needle roller 233 and the rotating shaft 21 is smaller, which can further reduce noise.

[0027] Combination Figure 2 , Figure 3 and Figure 5 As shown, in a first embodiment of the needle roller bearing 23, the needle roller bearing 23 further includes an inner cylindrical portion 231 and an outer cylindrical portion 232. The inner cylindrical portion 231 and the outer cylindrical portion 232 are fixedly or circumferentially limited. The outer peripheral wall of the outer cylindrical portion 232 is fixedly or circumferentially limited to the wall forming the mounting hole 2210. The inner cylindrical portion 231 has a receiving hole 2310 that penetrates the inner cylindrical portion 231 along the radial direction of the needle roller bearing 23. At least a portion of the needle rollers 233 are located between the inner cylindrical portion 231 and the outer cylindrical portion 232. The needle rollers 233 are correspondingly provided with the receiving hole 2310. The width of the inner cavity 2310 is smaller than the outer diameter of the needle roller 233. At least a portion of the needle roller 233 is located in the inner cavity 2310. The needle roller 233 can contact and roll with the outer peripheral wall of the rotating shaft 21 and can contact and roll with the inner peripheral wall of the outer cylindrical portion 232. Specifically, the outer cylindrical portion 232 also includes an extension 234. There are two extensions 234, which are located at both ends of the axial direction of the outer cylindrical portion 232. The extensions 234 extend radially inward along the outer cylindrical portion 232. The two ends of the inner cylindrical portion 231 are fixedly connected to the corresponding extensions 234.

[0028] The needle roller 233 can contact and roll against the outer peripheral wall of the rotating shaft 21, and it can also contact and roll against the inner peripheral wall of the outer cylindrical portion 232. With this configuration, during the rotation of the rotating shaft 21, the rolling friction between the outer wall of the needle roller 233 and the outer wall of the rotating shaft 21 exerts a resistance torque on the rotating shaft 21. The direct contact between the needle roller 233 and the rotating shaft 21 has two advantages: firstly, the distance between the frictional force between the needle roller 233 and the axis of the rotating shaft 21 is relatively small, which helps reduce the resistance torque exerted by the needle roller 233 on the rotating shaft 21; secondly, it facilitates lubrication of the needle roller 233 through the rotation of the outer wall of the rotating shaft 21. Since the needle roller 233 is small and located inside the needle roller bearing 23, lubrication of the needle roller 233 can be conveniently achieved by lubricating the outer wall of the rotating shaft 21. Both of these aspects reduce the frictional force experienced by the needle roller 233, thereby further weakening the vibration caused by friction and further reducing noise.

[0029] Furthermore, in combination Figure 2 and Figure 3 As shown, the surface roughness of the outer peripheral wall of the rotating shaft 21 is less than the surface roughness of the inner peripheral wall forming the mounting hole 2210. The outer wall of the outer cylindrical part 232 is press-fitted, circumferentially limited, or transitionally fitted with the wall forming the mounting hole 2210. Specifically, the rotating shaft 21 is made of 304 stainless steel. The wall forming the mounting hole 2210 includes a metal wall formed by steel powder metallurgy. The wall forming the mounting hole 2210 is formed by metal powder through powder metallurgy, which has a lower cost. The surface roughness and processing accuracy of the outer wall of the rotating shaft 21 made of 304 stainless steel are better than those of the wall forming the mounting hole 2210 formed by powder metallurgy.

[0030] The surface roughness of the outer peripheral wall of the rotating shaft 21 is less than the surface roughness of the inner peripheral wall forming the mounting hole 2210. With this configuration, since the area of ​​the outer wall of the rotating shaft 21 is smaller than the area of ​​the side wall forming the mounting hole 2210, and the outer wall of the rotating shaft 21 is exposed, the cost of surface roughening the outer wall of the rotating shaft 21 is lower than the cost of surface roughening the side wall forming the mounting hole 2210, which helps to reduce the processing cost of the parts.

[0031] Combination Figure 6 , refer to Figure 2 , Figure 3 and Figure 5As shown, in a second embodiment of the needle roller bearing 23, the needle roller bearing 23 further includes an inner cylindrical portion 231 and an outer cylindrical portion 232. The inner cylindrical portion 231 and the outer cylindrical portion 232 are fixedly or circumferentially limited. The inner wall of the inner cylindrical portion 231 is fixedly or circumferentially limited to the outer wall of the rotating shaft 21. The outer cylindrical portion 232 has an outer receiving hole 2320. Along the radial direction of the needle roller bearing 23, the outer receiving hole 2320 penetrates the outer cylindrical portion 232. At least a portion of the needle rollers 233 are located between the inner cylindrical portion 231 and the outer cylindrical portion 232. The needle rollers 233 are correspondingly arranged with the outer receiving hole 2320. The width of the hole 2320 is smaller than the outer diameter of the needle roller 233. At least a portion of the needle roller 233 is located in the outer receiving hole 2320. The needle roller 233 can contact and roll with the outer peripheral wall of the inner cylindrical portion 231. The needle roller 233 can contact and roll with the inner peripheral wall forming the mounting hole 2210. Specifically, the outer cylindrical portion 232 also includes an extension 234. There are two extensions 234. The two extensions 234 are located at both ends of the axial direction of the outer cylindrical portion 232. The extensions 234 extend radially inward along the outer cylindrical portion 232. The two ends of the inner cylindrical portion 231 are fixedly connected to the corresponding extensions 234.

[0032] The needle roller 233 can contact and roll with the outer peripheral wall of the inner cylindrical part 231, and the needle roller 233 can contact and roll with the inner peripheral wall of the mounting hole 2210. With this configuration, since the wall of the mounting hole 2210 is stationary, the wall of the mounting hole 2210 is more likely to stick to the lubricating oil. During the rotation of the shaft 21, it is convenient to lubricate the needle roller 233 through the inner peripheral wall of the mounting hole 2210. By applying lubricating oil to the inner peripheral wall of the mounting hole 2210, the needle roller 233 can be easily lubricated, which helps to reduce the friction force on the needle roller 233, thereby reducing the vibration of the needle roller 233 caused by friction and thus reducing noise.

[0033] Combination Figure 7 , refer to Figure 2 , Figure 3 and Figure 5As shown, in a third embodiment of the needle roller bearing 23, the needle roller bearing 23 further includes an inner cylindrical portion 231 and an outer cylindrical portion 232. The inner cylindrical portion 231 and the outer cylindrical portion 232 are fixed or circumferentially limited. The inner cylindrical portion 231 has a receiving hole 2310, and the outer cylindrical portion 232 has an outer receiving hole 2320. Along the radial direction of the needle roller bearing 23, the receiving hole 2310 penetrates the inner cylindrical portion 231, and the outer receiving hole 2320 penetrates the outer cylindrical portion 232. At least a portion of the needle rollers 233 are located between the inner cylindrical portion 231 and the outer cylindrical portion 232. The needle rollers 233 are correspondingly arranged with the receiving hole 2310 and the outer receiving hole 2320. The width of the receiving hole 2310 is smaller than that of the needle rollers. The outer diameter of the needle 233 and the width of the outer receiving hole 2320 are smaller than the outer diameter of the needle 233. At least a portion of the needle 233 is located in the inner receiving hole 2310 and at least a portion of the needle 233 is located in the outer receiving hole 2320. The needle 233 can contact and roll with the outer peripheral wall of the rotating shaft 21 and can contact and roll with the inner peripheral wall forming the mounting hole 2210. Specifically, the outer cylindrical portion 232 also includes an extension portion 234. There are two extension portions 234. The two extension portions 234 are located at both ends of the axial direction of the outer cylindrical portion 232. The extension portions 234 extend radially inward along the outer cylindrical portion 232. The two ends of the inner cylindrical portion 231 are fixedly connected to the corresponding extension portions 234.

[0034] The needle roller 233 can contact and roll with the outer peripheral wall of the rotating shaft 21, and the needle roller 233 can contact and roll with the inner peripheral wall forming the mounting hole 2210. With this configuration, compared with the first and second embodiments of the needle roller bearing 23, the radial width of the needle roller bearing 23 is narrower, which is beneficial to further reduce the radial width occupied by the needle roller bearing 23 and to the miniaturization of the drive assembly 2.

[0035] Combination Figure 8 , refer to Figure 2 , Figure 3 and Figure 5As shown, in a fourth embodiment of the needle roller bearing 23, the needle roller bearing 23 further includes an inner cylindrical portion 231 and an outer cylindrical portion 232. The inner cylindrical portion 231 and the outer cylindrical portion 232 are rotatable relative to each other. The inner circumferential wall of the inner cylindrical portion 231 is fixed or circumferentially limited to the outer wall of the rotating shaft 21, and the outer circumferential wall of the outer cylindrical portion 232 is fixed or circumferentially limited to the wall forming the mounting hole 2210. Along the radial direction of the needle roller bearing 23, at least a portion of the needle rollers 233 are located between the inner cylindrical portion 231 and the outer cylindrical portion 232, and the needle rollers 233 can... The needle roller 233 can contact and roll with the outer peripheral wall of the inner cylindrical portion 231, and can contact and roll with the inner peripheral wall of the outer cylindrical portion 232. Specifically, the outer cylindrical portion 232 also includes an extension 234. There are two extensions 234, which are located at the two axial ends of the outer cylindrical portion 232. The extensions 234 extend radially inward along the axial direction of the needle roller bearing 23. The inner cylindrical portion 231 is located between the two extensions 234, and the inner cylindrical portion 231 can rotate relative to the two extensions 234.

[0036] The needle roller 233 can contact and roll with the outer peripheral wall of the inner cylindrical part 231, and the needle roller 233 can contact and roll with the inner peripheral wall of the outer cylindrical part 232. With this configuration, the surface roughness of the shaft 21 and the wall forming the mounting hole 2210 does not affect the rotational resistance of the shaft 21, which is beneficial to the long-term stable operation of the needle roller bearing 23.

[0037] Combination Figure 2 , Figure 3 and Figure 4 As shown, the wall forming the mounting hole 2210 includes a guide wall 2213 and a mounting wall 2214. Along the axial direction of the rotating shaft 21, the guide wall 2213 is closer to the mounting opening of the mounting hole 2210 than the mounting wall 2214. The inner diameter of the guide wall 2213 is larger than the inner diameter of the mounting wall 2214. The needle roller bearing 23 is located radially inside the mounting wall 2214. The inner diameter of the guide wall 2213 increases from the direction of the guide wall 2213 to the mounting wall 2214. Specifically, when assembling the needle roller bearing 23, the needle roller bearing 23 is assembled into the mounting hole 2210 through the mounting opening. The guide wall 2213 is flared, and the mounting wall 2214 is cylindrical. The large diameter portion of the guide wall 2213 forms the mounting opening of the mounting hole 2210, and the small diameter portion of the guide wall 2213 intersects with the mounting wall 2214.

[0038] Along the axial direction of the rotating shaft 21, the guide wall 2213 is closer to the mounting opening of the mounting hole 2210 than the mounting wall 2214. The inner diameter of the guide wall 2213 is larger than the inner diameter of the mounting wall 2214, and the needle roller bearing 23 is located radially inside the mounting wall 2214. The inner diameter of the guide wall 2213 increases from the direction of the guide wall 2213 to the mounting wall 2214. With this configuration, the needle roller bearing 23 can be assembled into the mounting hole 2210 under the guidance of the guide wall 2213. The configuration of the guide wall 2213 can reduce the alignment error between the needle roller bearing 23 and the mounting hole 2210, which is beneficial for the rapid assembly of the needle roller bearing 23.

[0039] Combination Figure 2 , Figure 3 and Figure 4 As shown, the support component 22 includes a bearing housing 221 and a fixed gear ring 222. The mounting hole 2210 is located in the bearing housing 221. At least part of the bearing housing 221 is located on the radial inner side of the fixed gear ring 222. The bearing housing 221 is located on the radial inner side of the fixed gear ring 222. The bearing housing 221 and the fixed gear ring 222 are fixed, limited, or integrally formed. Specifically, since the internal teeth of the fixed gear ring 222 need to mesh, the mounting hole 2210 of the bearing housing 221 only needs to position the needle roller bearing 23. Therefore, the assembly accuracy requirement of the fixed gear ring 222 is higher than that of the bearing housing 221. The bearing housing 221 is formed by powder metallurgy steel, and the fixed gear ring 222 is formed by subtractive processing. The outer wall of the bearing housing 221 and the inner wall of the fixed gear ring 222 are interference fit.

[0040] The support component 22 includes a bearing housing 221 and a fixed gear ring 222, with a mounting hole 2210 located in the bearing housing 221. This arrangement allows the bearing housing 221 and the fixed gear ring 222 to be machined separately according to the assembly accuracy requirements of the bearing housing 221 and the fixed gear ring 222, which helps to reduce machining costs.

[0041] Combination Figure 2 and Figure 3As shown, the drive assembly 2 also includes a cover plate 24 and a planetary gear assembly 25. At least a portion of the planetary gear assembly 25 is located radially inside the fixed gear ring 222. The planetary gear assembly 25 meshes with the fixed gear ring 222 for transmission. The planetary gear assembly 25 includes a gear 250. Along the axial direction of the rotating shaft 21, the cover plate 24 and the gear 250 are respectively located on one side of the bearing housing 221. One end of the rotating shaft 21 is fixed or circumferentially limited to the gear 250, and the other end of the rotating shaft 21 is fixed or circumferentially limited to the cover plate 24. Along the axial direction of the rotating shaft 21, the mounting opening of the mounting hole 2210 faces the cover plate 24. Specifically, one end of the rotating shaft 21 is interference-fitted with the gear 250, and the other end of the rotating shaft 21 is welded and fixed to the cover plate 24. The drive assembly 2 also includes a connecting shaft 27. The planetary gear assembly 25 is used to transmit the power provided by the rotating shaft 21 to the connecting shaft 27. The planetary gear assembly 25 can drive the connecting shaft 27 to rotate. The connecting shaft 27 is fixed or limited to the valve core 3.

[0042] One end of the rotating shaft 21 is fixed or circumferentially limited to the gear 250, and the other end of the rotating shaft 21 is fixed or circumferentially limited to the cover plate 24. Along the axial direction of the rotating shaft 21, the mounting opening of the mounting hole 2210 faces the cover plate 24. With this arrangement, the gear 250 and the needle roller bearing 23 are assembled from the two ends of the rotating shaft 21 respectively, without interfering with each other, which facilitates the assembly of the drive assembly 2.

[0043] Combination Figures 2 to 4 As shown, the bearing housing 221 includes a protrusion 2211 that protrudes radially inward from the wall forming the mounting hole 2210. The rotating shaft 21 includes a body portion 210 and a stepped portion 211. The outer diameter of the stepped portion 211 is larger than the inner diameter of the inner peripheral wall of the protrusion 2211. The body portion 210 is located radially inside the protrusion 2211. Along the axial direction of the rotating shaft 21, the needle roller bearing 23 is located between the protrusion 2211 and the cover plate 24. The protrusion 2211 is located between the stepped portion 211 of the needle roller bearing 23. The stepped portion 211 is located between the protrusion 2211 and the gear 250. Specifically, the protrusion 2211 is annular, and at least a portion of the body portion 210 is clearance-fitted with the inner peripheral wall of the protrusion 2211.

[0044] The outer diameter of the stepped portion 211 is larger than the inner diameter of the inner peripheral wall of the protrusion 2211. With this arrangement, along the axial direction of the shaft 21, the protrusion 2211 restricts the needle roller bearing 23 from moving axially toward the side closer to the planetary gear assembly 25. The protrusion 2211 can position the needle roller bearing 23, which is beneficial for assembling the needle roller bearing 23.

[0045] Combination Figure 2 and Figure 3As shown, the bearing housing 221 also has a limiting groove 2212, the inner diameter of which is larger than the inner diameter of the inner peripheral wall of the protrusion 2211; at least a portion of the stepped portion 211 is located in the limiting groove 2212, the outer peripheral wall of the stepped portion 211 is clearance-fitted with the side wall forming the limiting groove 2212, and along the radial direction of the rotating shaft 21, the distance between the outer peripheral wall of the stepped portion 211 and the side wall forming the limiting groove 2212 is smaller than the distance between the outer peripheral wall of the body portion 210 and the inner peripheral wall of the protrusion 2211.

[0046] The distance between the outer peripheral wall of the step portion 211 and the side wall forming the limiting groove 2212 is smaller than the distance between the outer peripheral wall of the body portion 210 and the inner peripheral wall of the protrusion 2211. With this arrangement, the side wall forming the limiting groove 2212 can limit the radial swing of the step portion 211 to a certain extent, and maintain the position stability of the rotating shaft 21 without applying additional friction to the rotating shaft 21.

[0047] It is worth noting that "roughly parallel" as described above refers to an acute angle between two directions that is less than 15°, while "roughly perpendicular" refers to an acute angle between two directions that is greater than 75°.

[0048] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0049] It should be noted that the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A valve device, characterized in that: It includes a drive assembly (2) and a valve core (3), wherein the drive assembly (2) can drive the valve core (3) to move; The drive assembly (2) includes a rotating shaft (21), a support component (22), and a needle roller bearing (23). The support component (22) has a mounting hole (2210). The inner circumferential side of the needle roller bearing (23) is fixedly connected to the rotating shaft (21), or circumferentially limited, or rollingly engaged. The outer circumferential side of the needle roller bearing (23) is fixedly connected to the wall forming the mounting hole (2210), or circumferentially limited, or rollingly engaged. The needle roller bearing (23) includes the needle rollers (233), the axial direction of which is generally parallel to the axial direction of the shaft (21).

2. The valve device according to claim 1, characterized in that, The needle roller bearing (23) further includes an inner cylindrical portion (231) and an outer cylindrical portion (232), wherein the inner cylindrical portion (231) is fixed or circumferentially limited to the outer cylindrical portion (232), and the outer peripheral wall of the outer cylindrical portion (232) is fixed or circumferentially limited to the wall forming the mounting hole (2210); The inner cylindrical portion (231) has a content receiving hole (2310) that extends through the inner cylindrical portion (231) along the radial direction of the needle roller bearing (23). At least a portion of the needle rollers (233) are located between the inner cylindrical portion (231) and the outer cylindrical portion (232). The needle rollers (233) are correspondingly arranged with the content receiving hole (2310). The width of the content receiving hole (2310) is smaller than the outer diameter of the needle rollers (233). At least a portion of the needle rollers (233) are located in the content receiving hole (2310). The needle rollers (233) can contact and roll with the outer peripheral wall of the rotating shaft (21). The needle rollers (233) can contact and roll with the inner peripheral wall of the outer cylindrical portion (232).

3. The valve device according to claim 2, characterized in that, The surface roughness of the outer peripheral wall of the rotating shaft (21) is less than the surface roughness of the inner peripheral wall forming the mounting hole (2210). The outer wall of the outer cylindrical part (232) is interference-fitted, circumferentially limited, or transitionally fitted with the wall forming the mounting hole (2210).

4. The valve device according to claim 3, characterized in that, The shaft (21) is made of stainless steel, and the wall forming the mounting hole (2210) is a metal wall formed by steel powder metallurgy.

5. The valve device according to claim 1, characterized in that, The needle roller bearing (23) further includes an inner cylindrical portion (231) and an outer cylindrical portion (232). The inner cylindrical portion (231) is fixed or circumferentially limited to the outer cylindrical portion (232). The inner wall of the inner cylindrical portion (231) is fixed or circumferentially limited to the outer wall of the rotating shaft (21). The outer cylindrical portion (232) has an outer receiving hole (2320) that extends through the outer cylindrical portion (232) along the radial direction of the needle roller bearing (23). At least a portion of the needle rollers (233) are located between the inner cylindrical portion (231) and the outer cylindrical portion (232). The needle rollers (233) are correspondingly arranged with the outer receiving hole (2320). The width of the outer receiving hole (2320) is smaller than the outer diameter of the needle rollers (233). At least a portion of the needle rollers (233) are located in the outer receiving hole (2320). The needle rollers (233) can contact and roll with the outer peripheral wall of the inner cylindrical portion (231). The needle rollers (233) can contact and roll with the inner peripheral wall that forms the mounting hole (2210).

6. The valve device according to claim 1, characterized in that, The needle roller bearing (23) further includes an inner cylindrical portion (231) and an outer cylindrical portion (232), wherein the inner cylindrical portion (231) and the outer cylindrical portion (232) are fixed or circumferentially limited. The inner cylindrical portion (231) has an inner receiving hole (2310), and the outer cylindrical portion (232) has an outer receiving hole (2320). Along the radial direction of the needle roller bearing (23), the inner receiving hole (2310) penetrates the inner cylindrical portion (231), and the outer receiving hole (2320) penetrates the outer cylindrical portion (232). At least a portion of the needle rollers (233) are located between the inner cylindrical portion (231) and the outer cylindrical portion (232). The roller needle (233) is correspondingly disposed with the content receiving hole (2310) and the outer receiving hole (2320). The width of the content receiving hole (2310) is smaller than the outer diameter of the roller needle (233), and the width of the outer receiving hole (2320) is smaller than the outer diameter of the roller needle (233). At least a portion of the roller needle (233) is located in the content receiving hole (2310), and at least a portion of the roller needle (233) is located in the outer receiving hole (2320). The needle roller (233) can contact and roll with the outer peripheral wall of the rotating shaft (21), and the needle roller (233) can contact and roll with the inner peripheral wall forming the mounting hole (2210).

7. The valve device according to claim 1, characterized in that, The needle roller bearing (23) further includes an inner cylindrical portion (231) and an outer cylindrical portion (232). The inner cylindrical portion (231) and the outer cylindrical portion (232) are rotatable relative to each other. The inner circumferential wall of the inner cylindrical portion (231) is fixed or circumferentially limited to the outer wall of the rotating shaft (21). The outer circumferential wall of the outer cylindrical portion (232) is fixed or circumferentially limited to the wall forming the mounting hole (2210). Along the radial direction of the needle roller bearing (23), at least a portion of the needle rollers (233) are located between the inner cylindrical portion (231) and the outer cylindrical portion (232). The needle rollers (233) are able to contact and roll with the outer peripheral wall of the inner cylindrical portion (231) and with the inner peripheral wall of the outer cylindrical portion (232).

8. The valve device according to any one of claims 2-7, characterized in that, The wall forming the mounting hole (2210) includes a guide wall (2213) and a mounting wall (2214). Along the axial direction of the rotating shaft (21), the guide wall (2213) is closer to the mounting opening of the mounting hole (2210) than the mounting wall (2214). The inner diameter of the guide wall (2213) is larger than the inner diameter of the mounting wall (2214). The needle roller bearing (23) is located radially inside the mounting wall (2214). The inner diameter of the guide wall (2213) increases from the direction from the guide wall (2213) to the mounting wall (2214).

9. The valve device according to any one of claims 1-7, characterized in that, The support component (22) includes a bearing housing (221) and a fixed gear ring (222). The mounting hole (2210) is located in the bearing housing (221). At least a portion of the bearing housing (221) is located on the radial inner side of the fixed gear ring (222). The bearing housing (221) is fixed, limited, or integrally connected with the fixed gear ring (222). The drive assembly (2) also includes a cover plate (24) and a planetary gear assembly (25), at least a portion of which is located radially inside the fixed gear ring (222). The planetary gear assembly (25) meshes with the fixed gear ring (222) for transmission. The planetary gear assembly (25) includes a gear (250). Along the axial direction of the rotating shaft (21), the cover plate (24) and the gear (250) are respectively located on one side of the bearing seat (221). One end of the rotating shaft (21) is fixed or circumferentially limited to the gear (250), and the other end of the rotating shaft (21) is fixed or circumferentially limited to the cover plate (24). Along the axial direction of the rotating shaft (21), the mounting opening of the mounting hole (2210) faces the cover plate (24).

10. The valve device according to claim 8, characterized in that, The support component (22) includes a bearing housing (221) and a fixed gear ring (222). The mounting hole (2210) is located in the bearing housing (221). At least a portion of the bearing housing (221) is located on the radial inner side of the fixed gear ring (222). The bearing housing (221) is fixed, limited, or integrally connected with the fixed gear ring (222). The drive assembly (2) also includes a cover plate (24) and a planetary gear assembly (25), at least a portion of which is located radially inside the fixed gear ring (222). The planetary gear assembly (25) meshes with the fixed gear ring (222) for transmission. The planetary gear assembly (25) includes a gear (250). Along the axial direction of the rotating shaft (21), the cover plate (24) and the gear (250) are respectively located on one side of the bearing seat (221). One end of the rotating shaft (21) is fixed or circumferentially limited to the gear (250), and the other end of the rotating shaft (21) is fixed or circumferentially limited to the cover plate (24). Along the axial direction of the rotating shaft (21), the mounting opening of the mounting hole (2210) faces the cover plate (24).

11. The valve device according to claim 9, characterized in that, The bearing housing (221) also has a protrusion (2211) that protrudes radially inward from the wall forming the mounting hole (2210). The shaft (21) includes a body portion (210) and a stepped portion (211). The outer diameter of the stepped portion (211) is larger than the inner diameter of the inner peripheral wall of the protrusion (2211). The body portion (210) is located radially inside the protrusion (2211). Along the axial direction of the shaft (21), the needle roller bearing (23) is located between the protrusion (2211) and the cover plate (24), the protrusion (2211) is located between the needle roller bearing (23) and the stepped portion (211), and the stepped portion (211) is located between the protrusion (2211) and the gear (250).

12. The valve device according to claim 10, characterized in that, The bearing housing (221) also has a protrusion (2211) that protrudes radially inward from the wall forming the mounting hole (2210). The shaft (21) includes a body portion (210) and a stepped portion (211). The outer diameter of the stepped portion (211) is larger than the inner diameter of the inner peripheral wall of the protrusion (2211). The body portion (210) is located radially inside the protrusion (2211). Along the axial direction of the shaft (21), the needle roller bearing (23) is located between the protrusion (2211) and the cover plate (24), the protrusion (2211) is located between the needle roller bearing (23) and the stepped portion (211), and the stepped portion (211) is located between the protrusion (2211) and the gear (250).

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