EGR valve driver

Abstract

The utility model discloses an EGR (Exhaust Gas Recirculation) valve driver. The EGR valve driver comprises a motor used for outputting power, a planetary transmission mechanism used for transmitting power and reducing speed, an output shaft used for outputting power, a stabilizing mechanism used for keeping the output shaft stable and a shell used for installing the motor, the planetary transmission mechanism, the output shaft and the stabilizing mechanism, and the motor is connected with the output shaft through the planetary transmission mechanism. The stabilizing mechanism comprises a first connecting piece used for being fixed to the output shaft, a second connecting piece used for being fixed to the shell, rolling pieces used for abutting against the first connecting piece and the second connecting piece, and a retainer used for keeping the distance between the rolling pieces, a first groove is formed in the first connecting piece, and a second groove is formed in the second connecting piece. The rolling piece is arranged on the retainer, one side of the rolling piece abuts against the interior of the first groove, and the other side of the rolling piece abuts against the interior of the second groove. According to the EGR valve driver, the output shaft can be prevented from shaking, and therefore the service life of a planetary transmission mechanism is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of EGR valve technology, and in particular to an EGR valve actuator. Background Technology

[0002] Currently, EGR valves are typically driven by a motor via a transmission mechanism, which rotates the output shaft to open or close the valve. To prevent wear on the housing during output shaft rotation, a bushing is placed between the output shaft and the housing. Due to the low cost of bushings, most EGR valves connect the output shaft to the housing via a bushing. Since the bushing does not need to rotate, but the output shaft does, there is always a certain gap between the bushing and the output shaft. This causes an eccentricity in the output shaft during operation. For transmission mechanisms using a planetary structure, this eccentricity applies a force to the planetary gears, resulting in uneven stress on the gears. Over time, this can lead to wear or damage. Furthermore, because the bushing and output shaft are separate, the output shaft also experiences axial displacement. Utility Model Content

[0003] The technical problem to be solved by this invention is to provide an EGR valve driver that can ensure stable rotation of the output shaft.

[0004] To address the aforementioned problems, this utility model provides an EGR valve actuator. The EGR valve actuator includes a motor for outputting power, a planetary transmission mechanism for transmitting power and reducing speed, an output shaft for outputting power, a stabilizing mechanism for maintaining the stability of the output shaft, and a housing for mounting the motor, planetary transmission mechanism, output shaft, and stabilizing mechanism. The motor is connected to the output shaft via the planetary transmission mechanism. The stabilizing mechanism includes a first connecting member for fixing to the output shaft, a second connecting member for fixing to the housing, rolling elements for abutting against the first and second connecting members, and a retainer for maintaining the distance between the rolling elements. The first connecting member has a first groove, the second connecting member has a second groove, the rolling elements are disposed on the retainer, one side of the rolling elements abuts against the first groove, and the other side of the rolling elements abuts against the second groove.

[0005] Furthermore, the first connector is interference-fitted with the output shaft, and the second connector is interference-fitted with the housing.

[0006] Furthermore, the housing is also provided with an oil seal for sealing and stabilizing the mechanism, and the output shaft passes through the oil seal.

[0007] Furthermore, the oil seal has an outwardly extending protrusion in the middle, which is inclined toward the axis of the output shaft and is interference-fitted with the output shaft.

[0008] Furthermore, the housing includes a first housing for mounting the motor, a mounting base for mounting an angle detection mechanism for detecting the rotation angle of the output shaft, and a second housing for mounting the output shaft. The first housing and the second housing are snapped onto the mounting base, and the first housing and the second housing are located on opposite sides of the mounting base.

[0009] Furthermore, the mounting base is provided with a snap-fit ​​part, and both the first housing and the second housing are provided with snap hooks, which snap onto the snap-fit ​​part, and the snap hooks on the first housing and the second housing are misaligned.

[0010] Furthermore, the end face of the output shaft near the mounting base is provided with a placement groove for placing a magnet, and the mounting base is provided with a mounting groove for mounting an angle detection mechanism. The bottom of the mounting groove is provided with a through hole penetrating the mounting base, and the through hole is aligned with the placement groove.

[0011] Furthermore, the planetary transmission mechanism includes a sun gear for connecting to the output end of the motor, a planetary gear for transmission, and a gear ring for connecting to the output shaft. The planetary gear is provided with a rotating shaft, which is mounted on the first housing and / or mounting base. The planetary gear includes a first tooth portion for meshing with the sun gear and a second tooth portion for meshing with the gear ring. The second tooth portion passes through the mounting base and connects to the first tooth portion. The mounting base is provided with a meshing port, and a portion of the second tooth portion protrudes from the meshing port to mesh with the gear ring.

[0012] Furthermore, the output shaft is provided with an isolation pad for isolating the gear ring from the housing.

[0013] Furthermore, the output shaft is provided with a bushing for accommodating radial movement of the output shaft and a wave-shaped shim for preventing axial movement of the output shaft. The bushing cooperates with the mounting base, and the two sides of the wave-shaped shim abut against the bushing and the gear ring.

[0014] This utility model of EGR valve actuator utilizes a first connector to connect to the output shaft, a second connector to connect to the housing, and a rolling element between the first and second connectors, so that the first connector can rotate without clearance relative to the second connector, that is, the output shaft can rotate without clearance with the housing, ensuring that the output shaft will not be eccentrically driven, thereby allowing the planetary transmission mechanism to be evenly stressed and extending its service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the EGR valve actuator of this utility model.

[0016] Figure 2 This is a cross-sectional view of a preferred embodiment of the EGR valve actuator of this utility model.

[0017] Figure 3 This is a magnified view of a portion of A in section 2.

[0018] Figure 4 This is a magnified view of part B in section 2.

[0019] Figure 5 This is a schematic diagram of the first shell structure.

[0020] Figure 6 This is a structural diagram of the mounting base.

[0021] Figure 7 This is a schematic diagram of the snap-fit ​​part.

[0022] Figure 8 This is a structural diagram of the mounting slot and perforation.

[0023] Figure 9 This is a schematic diagram of the second shell structure.

[0024] Figure 10 This is a schematic diagram of the oil seal structure.

[0025] The meanings of the labels in the attached diagram are as follows:

[0026] 1. Motor; 2. Planetary transmission mechanism; 21. Sun gear; 22. Planetary gear; 22. First tooth section; 221. Second tooth section; 222. Gear ring; 23. Rotating shaft; 24. Output shaft; 3. Stabilizing mechanism; 4. First connecting piece; 41. Second connecting piece; 42. Rolling element; 43. Cage; 44. Housing; 5. First housing; 51. Mounting base; 52. Mounting groove; 521. Through hole; 522. Engaging port; 523. Positioning step; 524. Second housing; 53. Snap-fit ​​part; 501. Guide slope; 5011. Snap-fit ​​surface; 5012. Snap hook; 502. Snap-fit ​​interface; 5021. Oil seal; 6. Protrusion; 61. Angle detection structure; 71. Magnet; 72. Isolation gasket; 81. Bushing; 82. Waveform gasket; 83. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figures 1 to 4As shown, a preferred embodiment of the EGR valve actuator of this utility model includes a motor 1 for outputting power, a planetary transmission mechanism 2 for transmitting power and decelerating, an output shaft 3 for outputting power, a stabilizing mechanism 4 for maintaining the stability of the output shaft 3, and a housing 5 for mounting the motor 1, the planetary transmission mechanism 2, the output shaft 3, and the stabilizing mechanism 4. The motor 1 is connected to the planetary transmission mechanism 2, the output shaft 3 is mounted on the planetary transmission mechanism 2, and the output shaft 3 is connected to the housing 5 through the stabilizing mechanism 4. An oil seal 6 is provided on the housing 5 to block the stabilizing mechanism 4. The oil seal 6 is located on the outer wall of the housing 5, and the output shaft 3 passes through the oil seal 6. The oil seal 6 is used to prevent external dust and impurities from entering the stabilizing mechanism 4.

[0029] The stabilizing mechanism 4 includes a first connector 41 for fixing to the output shaft 3, a second connector 42 for fixing to the housing 5, rolling elements 43 for abutting against the first connector 41 and the second connector 42, and a retainer 44 for maintaining the spacing between the rolling elements 43. The first connector 41 is annular, and a first groove is provided on the outer side of the first connector. The first groove is usually arc-shaped and is used to guide the rolling direction of the rolling elements 43, that is, to allow the rolling elements 43 to make circular motion around the center of the first connector 41. The first connector 41 is interference-fitted with the output shaft 3, that is, the inner side of the first connector 41 is in contact with the output shaft 3. The second connecting member 42 is annular and concentric with the first connecting member 41. A second groove, typically arc-shaped, is provided on the inner side of the second connecting member 42. This groove guides the rolling direction of the rolling member 43, allowing it to move in a circle around the center of the second connecting member 42. The second connecting member 42 is interference-fitted with the outer shell 5, meaning its outer side fits against the outer shell 5. The retainer 44 has multiple receiving cavities evenly distributed around the center of the first connecting member 41. Multiple rolling members 43 are present in each receiving cavity, which has a connecting opening to the outside, allowing a portion of the rolling member 43 to be exposed outside the retainer 44. This allows the rolling member 43 to roll simultaneously on both the first and second connecting members 41. The rolling member 43 is circular, and the shape of the receiving cavity is adapted to the rolling member 43. In other embodiments, the rolling member 43 can also be of other shapes. The retainer 44 includes two symmetrically arranged retaining plates, each with a receiving groove. The bottom of the receiving groove has a connecting opening. The two retaining plates are fixed by fasteners such as screws, thereby forming a receiving cavity between the two corresponding receiving grooves. The stabilizing mechanism 4 typically uses a bearing.

[0030] like Figures 5 to 9As shown, the outer casing 5 includes a first housing 51 for mounting the motor 1, a mounting base 52 for mounting an angle detection mechanism for detecting the rotation angle of the output shaft 3, and a second housing 53 for mounting the output shaft 3. The first housing 51 and the second housing 53 are snapped onto the mounting base 52, and the first housing 51 and the second housing 53 are located on opposite sides of the mounting base 52. Specifically, the mounting base 52 is provided with a snap-fit ​​portion 501, and both the first housing 51 and the second housing 53 are provided with hooks 502, which snap onto the snap-fit ​​portion 501. The hooks 502 on the first housing 51 and the second housing 53 are staggered to reduce the thickness of the mounting base 52. The hook 502 has a hook interface 5021, and the hook part 501 has a guide slope 5011 and a hook surface 5012. The hook interface 5021 and the hook surface 5012 abut against each other to hook the hook 502 onto the hook part 501. The guide slope 5011 can guide the corresponding hook 502 to bend outward from the housing, so that the hook 502 can slide smoothly into the hook interface 5021 without manual bending. The angle detection structure 71 is a magnetoresistive angle sensor. The end face of the output shaft 3 near the mounting base 52 is provided with a placement groove for placing the magnet 72. The mounting base 52 is provided with a mounting groove 521 for mounting the angle detection mechanism. The bottom of the mounting groove 521 is provided with a through hole 522 penetrating the mounting base 52. The through hole 522 is aligned with the output shaft 3. In this way, the angle detection structure 71 can directly detect the rotation angle of the output shaft 3, making the detection more accurate.

[0031] like Figure 2 , Figure 5 and Figure 6 As shown, the planetary transmission mechanism 2 includes a sun gear 21 for connecting to the output end of the motor 1, a planet gear 22 for transmission, and a gear ring 23 for connecting to the output shaft 3. A rotating shaft 24 is provided on the planet gear 22, and the rotating shaft 24 is mounted on the first housing 51 and the mounting base 52. In other embodiments, the rotating shaft 24 can also be mounted on either the first housing 51 or the mounting base 52. The planet gear 22 includes a first tooth portion 221 for meshing with the sun gear 21 and a second tooth portion 222 for meshing with the gear ring 23. The second tooth portion 222 passes through the mounting base 52 and connects to the first tooth portion 221. The mounting base 52 is provided with a meshing port 523, and a portion of the second tooth portion 222 protrudes from the meshing port 523 to mesh with the gear ring 23. This allows the angle detection sensor to directly detect the rotation angle of the output shaft 3 without affecting the connection between the planet gear 22 and the gear ring 23.

[0032] like Figure 3As shown, an isolation pad 81 is provided on the output shaft 3. The isolation pad 81 is located between the gear ring 23 and the second housing 5. The isolation pad 81 is used to isolate the gear ring 23 from the housing 5 and prevent friction between the gear ring 23 and the second housing 5.

[0033] like Figure 4 As shown, the output shaft 3 is provided with a bushing 82 and a wave-shaped washer 83; the mounting base 52 is provided with a positioning step 524, and the bushing 82 cooperates with the positioning step 524 of the mounting base 52, so that the bushing 82 can limit the radial movement of the output shaft 3; the two sides of the wave-shaped washer 83 abut against the bushing 82 and the gear ring 23, so as to prevent the output shaft 3 from moving axially.

[0034] like Figure 10 As shown, the oil seal 6 has an outwardly extending protrusion 61 in the middle. The protrusion is interference-fitted with the output shaft 3, which ensures that the oil seal 6 is always in contact with the output shaft 3, preventing dust and impurities from entering the stabilizing mechanism 4. The protrusion 61 is inclined towards the axis of the output shaft 3, ensuring that even if the oil seal 6 experiences some wear, the protrusion can still fit against the output shaft 3, preventing dust and impurities from entering the stabilizing mechanism 4 and extending the service life of the stabilizing mechanism 4.

[0035] During the rotation of the output shaft 3, the first connecting piece 41 is connected to the output shaft 3 without gap, the first connecting piece 41 is in contact with the rolling piece 43 without gap, the rolling piece 43 is in contact with the second connecting piece 42 without gap, and the second connecting piece 42 is connected to the second housing 53 without gap. This ensures that the output shaft 3 will not be driven eccentrically, thereby allowing the planetary transmission mechanism 2 to be subjected to force evenly and extending its service life.

[0036] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. An EGR valve actuator, characterized in that: The device includes a motor for outputting power, a planetary transmission mechanism for transmitting power and reducing speed, an output shaft for outputting power, a stabilizing mechanism for maintaining the stability of the output shaft, and a housing for mounting the motor, planetary transmission mechanism, output shaft, and stabilizing mechanism. The motor is connected to the output shaft via the planetary transmission mechanism. The stabilizing mechanism includes a first connecting member for fixing to the output shaft, a second connecting member for fixing to the housing, rolling elements for abutting against the first and second connecting members, and a retainer for maintaining the distance between the rolling elements. The first connecting member has a first groove, the second connecting member has a second groove, the rolling elements are disposed on the retainer, one side of the rolling elements abuts against the first groove, and the other side of the rolling elements abuts against the second groove.

2. The EGR valve actuator as described in claim 1, characterized in that: The first connector is interference-fitted to the output shaft, and the second connector is interference-fitted to the housing.

3. The EGR valve actuator as described in claim 1, characterized in that: The outer casing is also provided with an oil seal for sealing and stabilizing the mechanism, and the output shaft passes through the oil seal.

4. The EGR valve actuator as described in claim 3, characterized in that: The oil seal has an outwardly extending protrusion in the middle, which is inclined toward the axis of the output shaft and is interference-fitted with the output shaft.

5. The EGR valve actuator as described in claim 1, characterized in that: The housing includes a first housing for mounting the motor, a mounting base for mounting an angle detection mechanism for detecting the rotation angle of the output shaft, and a second housing for mounting the output shaft. The first housing and the second housing are snapped onto the mounting base, and the first housing and the second housing are located on opposite sides of the mounting base.

6. The EGR valve actuator as described in claim 5, characterized in that: The mounting base is provided with a snap-fit ​​part, and both the first housing and the second housing are provided with snap hooks. The snap hooks snap onto the snap-fit ​​part, and the snap hooks on the first housing and the second housing are misaligned.

7. The EGR valve actuator as described in claim 5, characterized in that: The output shaft has a placement groove for placing a magnet on one end face near the mounting base. The mounting base has a mounting groove for mounting an angle detection mechanism. The bottom of the mounting groove has a through hole that penetrates the mounting base and is aligned with the placement groove.

8. The EGR valve actuator as described in claim 5, characterized in that: The planetary transmission mechanism includes a sun gear for connecting to the output end of a motor, a planetary gear for transmission, and a gear ring for connecting to the output shaft. The planetary gear is provided with a rotating shaft, which is mounted on the first housing and / or mounting base. The planetary gear includes a first tooth portion for meshing with the sun gear and a second tooth portion for meshing with the gear ring. The second tooth portion passes through the mounting base and connects to the first tooth portion. The mounting base is provided with a meshing port, and a portion of the second tooth portion protrudes from the meshing port to mesh with the gear ring.

9. The EGR valve actuator as described in claim 8, characterized in that: The output shaft is provided with an isolation pad for isolating the gear ring from the housing.

10. The EGR valve actuator as described in claim 5, characterized in that: The output shaft is provided with a bushing for accommodating radial movement of the output shaft and a wave-shaped shim for preventing axial movement of the output shaft. The bushing cooperates with the mounting base, and the two sides of the wave-shaped shim abut against the bushing and the gear ring.

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