Dimming mechanism

Abstract

The utility model provides a dimming mechanism, and relates to the technical field of automobile lighting. A dimming mechanism comprises a lamp body matching seat, a dimming screw rod, a first dimming gear and a second dimming gear, the first dimming gear, the second dimming gear and the lamp body matching seat are connected to form a dimming structure, the first dimming gear is driven to drive the second dimming gear and the dimming screw rod to rotate around the axis direction of the dimming screw rod, and the dimming effect is achieved. The operation mode is similar to that of an existing dimming mechanism, and operation is convenient. An adjusting assembly is arranged at the connecting position of the dimming screw and the second dimming gear, the second dimming gear is fixedly installed through the adjusting assembly, and the first dimming gear, the second dimming gear and the lamp body matching base form a whole. The tightness degree of connection between the second dimming gear and the first dimming gear and between the second dimming gear and the lamp body matching seat can be adjusted through the adjusting assembly, too tight or too loose matching between the dimming gears is avoided, and the stability and precision of the dimming system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile lighting, in particular to a dimming mechanism. Background Art

[0002] Before leaving the factory, the headlight module needs to be adjusted several times to select the optimal light-emitting direction. After the position of the headlight module is determined, the headlight module is fixed to the lamp housing through the mounting structure. However, the existing mounting structure has poor stability. After long-term use, the connection between the mounting structure and the lamp housing will become loose, which will cause the light pattern projected by the headlight module to shift, affecting driving safety. In existing solutions, such as the dimming screw provided by the Chinese utility model patent with patent number CN201620920038, the dimming gear is usually pressed into the knurled part of the metal dimming screw by external force to achieve a fixed connection between the dimming gear and the dimming screw. However, in this connection method, the axial position of the dimming gear needs to be positioned by the lamp body, which increases the tolerance range of the gear position, and will cause the dimming gears to fit too tight or too loose, which is not conducive to the stability and accuracy of the dimming system, and it is difficult to adjust in the later stage and inconvenient to maintain. Utility Model Content

[0003] The purpose of the utility model is to provide a dimming mechanism to solve the above technical problems.

[0004] A dimming mechanism comprises: a lamp body matching seat, a dimming screw, a first dimming gear and a second dimming gear. The lamp body matching seat is provided with a mounting groove. The first dimming gear is rotatably arranged in the mounting groove. The first dimming gear and the second dimming gear are meshed with each other. The second dimming gear is fixedly arranged on the dimming screw. The dimming screw is rotatably connected to the lamp body matching seat. The first dimming gear is driven to drive the second dimming gear and the dimming screw to rotate around the axis of the dimming screw. An adjustment component is arranged at the connection between the dimming screw and the second dimming gear. The adjustment component is used to adjust the installation distance between the second dimming gear and the lamp body matching seat.

[0005] Furthermore, the adjustment component includes a fastening screw, a threaded hole is opened at one end of the dimming screw near the first dimming gear, the fastening screw is screwed into the threaded hole, one end of the second dimming gear is abutted against the fastening screw, and the other end of the second dimming gear is meshed with the first dimming gear.

[0006] Furthermore, a sealing assembly is provided at the connection between the dimming screw and the lamp body matching seat, and the sealing assembly includes a sealing ring sleeved on the dimming screw, and a sealing rib is provided on the dimming screw, one side of the sealing ring abuts against the sealing rib, and the other side of the sealing ring abuts against the lamp body matching seat.

[0007] Furthermore, a sealing groove is arranged on the lamp body matching seat, and a sealing ring is arranged in the sealing groove.

[0008] Furthermore, the mounting groove and the sealing groove are respectively arranged on two opposite sides of the lamp body matching seat.

[0009] Furthermore, a gear mating portion is provided at one end of the dimming screw rod close to the second dimming gear, and splines are circumferentially arranged on the gear mating portion. A connecting hole is provided on the second dimming gear, and a key groove is correspondingly provided on the inner side wall of the connecting hole. The gear mating portion of the dimming screw rod extends into the connecting hole, and the splines are engaged with the key grooves one by one.

[0010] Furthermore, the first dimming gear includes a gear portion, a mounting portion and an adjusting portion which are connected in sequence, the gear portion is meshed with the second dimming gear, the mounting portion is rotatably disposed in the mounting groove, and the adjusting portion is used to connect the dimming tool.

[0011] Furthermore, a matching groove is provided on the adjusting part, and the matching groove is a hexagonal groove or a cross groove. The dimming tool can be inserted into the matching groove, and the dimming tool is driven to match with the adjusting part.

[0012] Furthermore, the dimming mechanism also includes a dimming screw fixedly connected to the dimming bracket, the outer wall of the dimming screw is provided with an adjustment thread, and the screw bracket is correspondingly provided with a threaded hole or a threaded groove, and the dimming screw is threadedly connected to the screw bracket.

[0013] Furthermore, a stop portion is provided at one end of the dimming screw away from the first dimming gear, and when the dimming screw moves to the maximum adjustment position, the screw bracket abuts against the stop portion.

[0014] The utility model provides a dimming mechanism, which includes: a lamp body matching seat, a dimming screw, a first dimming gear and a second dimming gear. The first dimming gear, the second dimming gear and the lamp body matching seat are connected to form a dimming structure. The first dimming gear is driven to drive the second dimming gear and the dimming screw to rotate around the axis of the dimming screw to achieve a dimming effect. The operation method is similar to that of the existing dimming mechanism and is easy to operate. An adjustment component is provided at the connection between the dimming screw and the second dimming gear. The second dimming gear is installed and fixed by the adjustment component, and the first dimming gear, the second dimming gear and the lamp body matching seat form a whole. The tightness of the connection between the second dimming gear and the first dimming gear and the lamp body matching seat can be adjusted by the adjustment component to avoid the dimming gears from being too tight or too loose, which is beneficial to improving the stability and accuracy of the dimming system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A three-dimensional diagram of a dimming mechanism provided in an embodiment of the utility model;

[0017] Figure 2 A cross-sectional view of a dimming mechanism provided in an embodiment of the utility model;

[0018] Figure 3 A three-dimensional diagram of a dimming screw in a dimming mechanism provided in an embodiment of the utility model;

[0019] Figure 4 A three-dimensional diagram of a second dimming gear in a dimming mechanism provided in an embodiment of the utility model;

[0020] Figure 5 A three-dimensional diagram of a first dimming mechanism provided in an embodiment of the utility model;

[0021] Figure 6 One of the three-dimensional diagrams of the lamp body matching seat in the first dimming mechanism provided in the embodiment of the utility model;

[0022] Figure 7 The second stereoscopic view of the lamp body matching seat in the first dimming mechanism provided in the embodiment of the utility model.

[0023] Icon: 100-lamp body mating seat; 200-dimming screw; 300-first dimming gear; 400-second dimming gear; 500-adjustment component; 101-mounting slot; 501-fastening screw; 201-threaded hole; 600-sealing ring; 102-sealing slot; 206-sealing rib; 202-gear mating part; 203-spline; 401-connecting hole; 402-keyway; 301-gear part; 302-mounting part; 303-adjustment part; 304-mating slot; 700-screw bracket; 204-adjustment thread; 205-stop part. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present utility model, it should be noted that the terms "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] Example 1

[0029] The present embodiment provides a dimming mechanism, which includes: a lamp body matching seat 100, a dimming screw 200, a first dimming gear 300 and a second dimming gear 400. The lamp body matching seat 100 is provided with a mounting groove 101. The first dimming gear 300 is rotatably set in the mounting groove 101. The first dimming gear 300 and the second dimming gear 400 are meshed with each other. The second dimming gear 400 is fixedly set on the dimming screw 200. The dimming screw 200 is rotatably connected to the lamp body matching seat 100. The first dimming gear 300 is driven to drive the second dimming gear 400 and the dimming screw 200 to rotate around the axis of the dimming screw 200. An adjustment component 500 is provided at the connection between the dimming screw 200 and the second dimming gear 400. The adjustment component 500 is used to adjust the installation distance between the second dimming gear 400 and the lamp body matching seat 100.

[0030] Please refer to Figure 1As shown, in this embodiment, the dimming screw 200 is a cylindrical screw, and a mounting hole is provided on the lamp body matching seat 100. The dimming screw 200 is inserted into the mounting hole, and the dimming screw 200 is rotatably connected to the lamp body matching seat 100. A mounting groove 101 is provided on the lamp body matching seat 100, and the first dimming gear 300 is arranged in the mounting groove 101 and can rotate freely in the mounting groove 101. A second dimming gear 400 is provided at one end of the dimming screw 200 close to the lamp body matching seat 100, and the second dimming gear 400 is fixedly connected to the dimming screw 200, and the first dimming gear 300 and the second dimming gear 400 are meshed with each other. The first dimming gear 300 is connected to a dimming tool to perform a dimming operation. The staff uses the dimming tool to rotate the first dimming gear 300. Since the first dimming gear 300 and the second dimming gear 400 are meshed with each other, the second dimming gear 400 and the dimming screw 200 connected to the second dimming gear 400 will be driven to rotate, thereby adjusting the position of the lamp body connected to the lamp body mating seat 100 relative to the dimming bracket to achieve dimming. Please refer to Figure 1 As shown, the connection between the dimming screw 200 and the second dimming gear 400 is provided with an adjustment component 500, and the adjustment component 500 is used to adjust the installation spacing between the second dimming gear 400 and the lamp body matching seat 100, so that the second dimming gear 400 and the lamp body matching seat 100 are tightly connected, the dimming error is reduced, and the distance of the dimming screw 200 driven by the rotation of the first dimming gear 300 can be accurately calculated. During use, due to external vibrations and thermal expansion and contraction, the second dimming gear 400 and the lamp body matching seat 100 may become loose, resulting in a larger dimming error. At this time, the position of the second dimming gear 400 can be adjusted by the adjustment component 500, so that the second dimming gear 400 and the lamp body matching seat 100 are tightly matched. By setting the adjustment component 500, the degree of tightness of the second dimming gear 400 and the first dimming gear 300 can be adjusted as needed, to prevent the first dimming gear 300 and the second dimming gear 400 from being too tight or too loose, affecting the adjustment accuracy or stability of the entire dimming system.

[0031] Furthermore, in some implementations of the present embodiment, the adjustment component 500 includes a fastening screw 501, and a threaded hole 201 is opened at one end of the dimming screw 200 close to the first dimming gear 300, and the fastening screw 501 is screwed into the threaded hole 201, one end of the second dimming gear 400 is abutted against the fastening screw 501, and the other end of the second dimming gear 400 is meshed with the first dimming gear 300.

[0032] Please refer to Figure 6As shown, in this embodiment, a U-shaped mounting groove 101 is provided on the lamp body matching seat 100, and an opening is formed on one side of the mounting groove 101, so as to facilitate the first dimming gear 300 to be arranged in the mounting groove 101. The second dimming gear 400 is located at the opening of the mounting groove 101 and meshes with the first dimming gear 300. The second dimming gear 400 and the lamp body matching seat 100 interact with each other to fix the first dimming gear 300 in the mounting groove 101 to prevent the first dimming gear 300 from falling off. Please refer to Figure 2 As shown, a threaded hole 201 is formed at one end of the dimming screw 200 close to the second dimming gear 400, and a fastening screw 501 is passed through the threaded hole 201. The fastening screw 501 abuts against the second dimming gear 400, so that the second dimming gear 400 is fixed between the fastening screw 501 and the lamp body matching seat 100. The fastening screw 501 can adjust the installation position of the second dimming gear 400, thereby adjusting the matching tightness of the second dimming gear 400, the first dimming gear 300 and the lamp body matching seat 100.

[0033] Optionally, in some implementations of the present embodiment, a sealing assembly is provided at the connection between the dimming screw 200 and the lamp body mating socket 100, and the sealing assembly includes a sealing ring 600 sleeved on the dimming screw 200, and a sealing rib 206 is provided on the dimming screw 200, one side of the sealing ring 600 abuts against the sealing rib 206, and the other side of the sealing ring 600 abuts against the lamp body mating socket 100.

[0034] Please refer to Figure 2 and Figure 3 As shown, in this embodiment, a sealing rib 206 is provided on the dimming screw 200. The sealing rib 206 and the fastening screw 501 are respectively located on both sides of the lamp body matching seat 100. The sealing rib 206 plays a limiting effect, and cooperates with the fastening screw 501 to fix the first dimming gear 300, the second dimming gear 400 and the lamp body matching seat 100. A sealing ring 600 is provided between the sealing rib 206 and the lamp body matching seat 100. The sealing ring 600 is sleeved on the dimming screw 200, and the two sides of the sealing ring 600 are respectively in contact with the sealing rib 206 and the lamp body matching seat 100. When the fastening screw 501 is tightened, the lamp body matching seat 100 and the sealing rib 206 jointly squeeze the sealing ring 600, so that the two sides of the sealing ring 600 are tightly fitted with the sealing rib 206 and the lamp body matching seat 100, which plays a role of sealing and waterproofing.

[0035] Optionally, in some implementations of the present embodiment, a sealing groove 102 is provided on the lamp body mating seat 100 , and the sealing ring 600 is provided in the sealing groove 102 .

[0036] Please refer to Figure 2 and Figure 7As shown, in this embodiment, a sealing groove 102 matching the shape of the sealing ring 600 is provided on the lamp body matching seat 100, and the sealing ring 600 is clamped in the sealing groove 102 to form an axial sealing structure with the sealing groove 102 to ensure the sealing effect.

[0037] Optionally, in this embodiment, the sealing ring 600 can be made of a soft material such as rubber or silicone. The sealing ring 600 can undergo a certain elastic deformation. In addition to the interference fit with the lamp body matching seat 100 and the sealing rib 206 to achieve a sealing effect, it can also play a buffering role. During the tightening process of the fastening screw 501 and the dimming process, the sealing ring 600 is deformed to ensure the smoothness of the rotation of the first dimming gear 300 and the second dimming gear 400. For example, during assembly, in order to ensure the tightness of the connection of the components, the fastening screw 501 can be adjusted to a relatively tight state, so that the sealing ring 600 undergoes a certain deformation, and the sealing ring 600 provides a certain pre-tightening force. Even if vibration or thermal expansion and contraction occur, the first dimming gear 300, the second dimming gear 400 and the lamp body matching seat 100 can still fit tightly. During the dimming process, the first dimming gear 300 and the second dimming gear 400 rotate relative to each other. When a jam occurs during the rotation, the sealing ring 600 may deform to avoid the gears from being unable to rotate due to jamming, thereby ensuring smoothness during dimming.

[0038] Optionally, in some implementations of this embodiment, the mounting groove 101 and the sealing groove 102 are respectively opened on two opposite sides of the lamp body mating seat 100 .

[0039] Please refer to Figure 2 As shown, in this embodiment, the mounting groove 101 and the sealing groove 102 are respectively arranged on both sides of the lamp body mating seat 100, so that the first dimming gear 300 and the sealing ring 600 are respectively installed on both sides of the lamp body mating seat 100, and the lamp body mating seat 100 is limited and fixed by tightening bolts and sealing ribs 206, thereby improving the stability of the device.

[0040] Optionally, in some implementations of the present embodiment, a gear mating portion 202 is provided at one end of the dimming screw 200 close to the second dimming gear 400, and splines 203 are circumferentially spaced on the gear mating portion 202. A connecting hole 401 is provided on the second dimming gear 400, and a key slot 402 is correspondingly provided on the inner side wall of the connecting hole 401. The gear mating portion 202 of the dimming screw 200 extends into the connecting hole 401, and the splines 203 are engaged with the key slots 402 in a one-to-one manner.

[0041] Please refer to Figure 2As shown, in this embodiment, the dimming screw 200 rotates synchronously with the second dimming gear 400, and the second dimming gear 400 and the dimming screw 200 are driven to rotate by driving the first dimming gear 300. At the same time, in order to realize the adjustment function of the adjustment component 500, the second dimming gear 400 can move along the length direction of the dimming screw 200. Therefore, the second dimming gear 400 and the dimming screw 200 are driven and connected by a key connection, which can ensure that the second dimming gear 400 and the dimming screw 200 rotate synchronously, and can also ensure that the second dimming gear 400 can rotate along the length direction of the dimming screw 200. Please refer to Figure 3 As shown, the dimming screw 200 is provided with a gear matching portion 202 for connecting with the second dimming gear 400, and a plurality of splines 203 are evenly spaced circumferentially arranged on the gear matching portion 202. Figure 4 As shown, a key slot 402 is correspondingly provided on the inner wall of the connecting hole 401 of the second dimming gear 400. After the second dimming gear 400 is connected to the dimming screw 200, the spline 203 cooperates with the key slot 402 to ensure that the second dimming gear 400 and the dimming screw 200 rotate synchronously.

[0042] Please refer to Figure 5 As shown, optionally, in some implementations of the present embodiment, the first dimming gear 300 includes a gear portion 301, a mounting portion 302 and an adjustment portion 303 connected in sequence, the gear portion 301 is meshed with the second dimming gear 400, the mounting portion 302 is rotatably disposed in the mounting groove 101, and the adjustment portion 303 is used to connect the dimming tool.

[0043] Optionally, in some implementations of the present embodiment, a mating groove 304 is provided on the adjusting portion 303 , and the mating groove 304 is a hexagonal groove or a cross groove, and a dimming tool can be inserted into the mating groove 304 , and the dimming tool is driven to cooperate with the adjusting portion 303 .

[0044] Please refer to Figure 7 As shown, in this embodiment, the first dimming gear 300 includes a gear portion 301, a mounting portion 302 and an adjusting portion 303, and the mounting portion 302 is clamped in the mounting groove 101 of the lamp body matching seat 100. The two ends of the mounting portion 302 are respectively connected to the gear portion 301 and the adjusting portion 303, the gear portion 301 at the lower end is meshed with the second dimming gear 400, and the adjusting portion 303 at the upper end is exposed outside the lamp body matching seat 100, which is convenient for connecting the dimming tool. After the operator connects the dimming tool with the adjusting portion 303, the first dimming gear 300 can be rotated, and the first dimming gear 300 drives the second dimming gear 400 meshed therewith to rotate, and the second dimming gear 400 drives the dimming screw 200 to rotate synchronously under the cooperation of the keyway 402 and the spline 203, thereby adjusting the position of the lamp body connected to the lamp body matching seat 100 to achieve the dimming operation.

[0045] Optionally, in some implementations of the present embodiment, the dimming mechanism also includes a screw bracket 700 fixedly connected to the dimming bracket, the dimming screw 200 is connected to the screw bracket 700, the outer wall of the dimming screw 200 is provided with an adjustment thread 204, and a screw hole or a thread groove is correspondingly provided on the screw bracket 700, and the dimming screw 200 is threadedly connected to the screw bracket 700.

[0046] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, an adjusting thread 204 is provided at one end of the dimming screw 200 away from the lamp body mating seat 100, and is threadedly connected to the screw bracket 700 on the dimming structure through the adjusting thread 204. When the dimming screw 200 rotates, it will be laterally displaced relative to the screw bracket 700. The dimming screw 200 can be controlled to move left or right by rotating the dimming screw 200 in the forward or reverse direction, thereby driving the lamp body connected to the lamp body mating seat 100 to move relative to the dimming bracket to achieve the dimming operation.

[0047] Optionally, in some implementations of the present embodiment, a stop portion 205 is provided at one end of the dimming screw 200 away from the first dimming gear 300 , and when the dimming screw 200 moves to the maximum adjustment position, the screw bracket 700 abuts against the stop portion 205 .

[0048] Please refer to Figure 3 As shown, in this embodiment, a stopper 205 is provided at one end of the dimming screw 200 away from the first dimming gear 300, and the diameter of the stopper 205 is larger than the diameter of the dimming screw 200. When the first dimming screw 200 moves to the right away from the end of the first dimming gear 300 to the maximum position, the stopper 205 abuts against the side wall of the screw bracket 700, thereby limiting the dimming screw 200 to prevent over-adjustment and prevent the dimming screw 200 from falling off.

[0049] Optionally, in some implementations of this embodiment, the fastening screw 501 may be made of metal, and the dimming screw 200, the first dimming gear 300, and the second dimming gear 400 may be made of plastic. The dimming screw 200, the first dimming gear 300, and the second dimming gear 400 are made of plastic, which is low in cost and easy to produce.

[0050] In summary, the utility model provides a dimming mechanism, which includes: a lamp body matching seat 100, a dimming screw 200, a first dimming gear 300 and a second dimming gear 400. The lamp body matching seat 100 is provided with a mounting groove 101, the first dimming gear 300 is rotatably arranged in the mounting groove 101, the dimming screw 200 is rotatably connected to the lamp body matching seat 100, the second dimming gear 400 is fixedly arranged on the dimming screw 200, and the first dimming gear 300 and the second dimming gear 400 are meshed with each other. The first dimming gear 300, the second dimming gear 400 and the lamp body matching seat 100 are connected to form a dimming structure, and the first dimming gear 300 is driven to drive the second dimming gear 400 and the dimming screw 200 to rotate around the axis direction of the dimming screw 200 to achieve a dimming effect, and the operation is simple, similar to the operation method of the existing dimming mechanism, and easy to operate. An adjustment component 500 is provided at the connection between the dimming screw 200 and the second dimming gear 400, and the adjustment component 500 is used to adjust the installation distance between the second dimming gear 400 and the lamp body matching seat 100. The second dimming gear 400 is installed and fixed by the adjustment component 500, and the first dimming gear 300, the second dimming gear 400 and the lamp body matching seat 100 form a whole. The adjustment component 500 can adjust the tightness of the connection between the second dimming gear 400 and the first dimming gear 300 and the lamp body matching seat 100, so as to avoid the dimming gears from being too tight or too loose, which is conducive to improving the stability and accuracy of the dimming system.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A dimming mechanism, characterized in that: include: A lamp body matching seat (100), a dimming screw rod (200), a first dimming gear (300) and a second dimming gear (400), wherein the lamp body matching seat (100) is provided with a mounting groove (101), the first dimming gear (300) is rotatably arranged in the mounting groove (101), the first dimming gear (300) and the second dimming gear (400) are meshed with each other, the second dimming gear (400) is fixedly arranged on the dimming screw rod (200), and the dimming screw rod ( The first dimming gear (300) is rotatably connected to the lamp body matching seat (100), the first dimming gear (300) is driven to drive the second dimming gear (400) and the dimming screw (200) to rotate around the axis of the dimming screw (200), and an adjustment component (500) is provided at the connection between the dimming screw (200) and the second dimming gear (400), and the adjustment component (500) is used to adjust the installation distance between the second dimming gear (400) and the lamp body matching seat (100).

2. The dimming mechanism according to claim 1, characterized in that: The adjustment component (500) comprises a fixing screw (501), a threaded hole (201) is provided at one end of the dimming screw rod (200) close to the first dimming gear (300), the fixing screw (501) is screwed into the threaded hole (201), one end of the second dimming gear (400) is in contact with the fixing screw (501), and the other end of the second dimming gear (400) is meshed with the first dimming gear (300).

3. The dimming mechanism according to claim 1, characterized in that: A sealing component is provided at the connection between the dimming screw (200) and the lamp body matching seat (100), and the sealing component comprises a sealing ring (600) sleeved on the dimming screw (200), and a sealing rib (206) is provided on the dimming screw (200), one side of the sealing ring (600) abuts against the sealing rib (206), and the other side of the sealing ring (600) abuts against the lamp body matching seat (100).

4. The dimming mechanism according to claim 3, characterized in that: The lamp body matching seat (100) is provided with a sealing groove (102), and the sealing ring (600) is arranged in the sealing groove (102).

5. The dimming mechanism according to claim 4, characterized in that: The mounting groove (101) and the sealing groove (102) are respectively arranged on two opposite sides of the lamp body matching seat (100).

6. The dimming mechanism according to claim 1, characterized in that: A gear mating portion (202) is provided at one end of the dimming screw rod (200) close to the second dimming gear (400), and splines (203) are circumferentially spaced on the gear mating portion (202). A connecting hole (401) is provided on the second dimming gear (400), and a key groove (402) is correspondingly provided on the inner side wall of the connecting hole (401). The gear mating portion (202) of the dimming screw rod (200) extends into the connecting hole (401), and the splines (203) are engaged with the key groove (402) in a one-to-one correspondence.

7. The dimming mechanism according to claim 1, characterized in that: The first dimming gear (300) comprises a gear portion (301), a mounting portion (302) and an adjusting portion (303) which are connected in sequence, the gear portion (301) is meshed with the second dimming gear (400), the mounting portion (302) is rotatably disposed in the mounting groove (101), and the adjusting portion (303) is used to connect a dimming tool.

8. The dimming mechanism according to claim 7, characterized in that: The adjusting portion (303) is provided with a matching groove (304), and the matching groove (304) is a hexagonal groove or a cross groove. The dimming tool can be inserted into the matching groove (304), and the dimming tool is driven to match with the adjusting portion (303).

9. The dimming mechanism according to claim 1, characterized in that: The dimming mechanism also includes a screw support (700) fixedly connected to the dimming support, the outer wall of the dimming screw (200) is provided with an adjustment thread (204), a screw hole or a thread groove is correspondingly provided on the screw support (700), and the dimming screw (200) is threadedly connected to the screw support (700).

10. The dimming mechanism according to claim 9, characterized in that: A stopper (205) is provided at one end of the dimming screw (200) away from the first dimming gear (300); when the dimming screw (200) moves to a maximum adjustment position, the screw bracket (700) abuts against the stopper (205).

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