A low beam light guide, mounting structure and vehicle lamp

Abstract

The present invention discloses a low-beam light guide, a mounting structure and a vehicle lamp, comprising a low-beam light guide body which is integrally injection-molded using a silicone material, the low-beam light guide body comprising a semi-cylindrical light guide portion, one end of the semi-cylindrical light guide portion is provided with an inclined end face, a light inlet portion is fixedly connected to the surface of the inclined end face, a funnel-shaped groove is provided in the middle of the light inlet portion, a convex light inlet protrusion is fixedly connected to the bottom of the groove, the low-beam light guide body of the present invention is integrally injection-molded using a silicone material, and can be mass-produced to improve efficiency and reduce costs, when light enters the light inlet portion, the intersection of the light is located at the connection between the end of the light guide protrusion and the cylindrical light guide portion, after being conducted by the semi-cylindrical light guide portion, the light enters the light outlet portion, and since the light guide protrusion is provided on the inner side of the light outlet portion, the light can be emitted downward at a certain angle according to the requirement of low-beam lighting, thereby achieving reasonable light distribution and providing a good low-beam lighting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamps, and in particular to a low-beam light guide, a mounting structure and a vehicle lamp. Background Art

[0002] In the development of modern automobiles, the lighting system is a key component to ensure driving safety and provide a comfortable driving experience. Low beam lights play an indispensable role in the driving process, especially at night or in low-visibility environments, such as foggy and rainy days. Low beam lights provide drivers with a clear view at close range, allowing them to detect road conditions, pedestrians and other vehicles in a timely manner. As road traffic conditions become increasingly complex, people's requirements for the performance of low beam lights are also getting higher and higher. Not only do they require them to provide sufficient lighting brightness, but they also need to ensure that the light distribution is reasonable to avoid glare interference to other road users.

[0003] However, existing low beam devices often cannot effectively control the propagation path of light, resulting in uneven light distribution. The light intake structure design of some low beam devices is not reasonable enough to collect light efficiently, resulting in a large loss of light when entering the light guide. Moreover, the structure of the traditional low beam light guide may not accurately refract and reflect the light according to the requirements of low beam lighting, thereby affecting the lighting effect of the low beam. At the same time, the low beam will generate heat when working. If the heat cannot be dissipated in a timely and effective manner, the heat accumulation may have a negative impact on the performance and life of the lamp, thereby affecting the lighting quality and reliability of the low beam. Summary of the invention

[0004] The object of the present invention is to provide a low beam light guide, a mounting structure and a vehicle lamp to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A low-beam light guide component comprises a low-beam light guide component body which is integrally injection-molded using a silicone material, the low-beam light guide component body comprising a semi-cylindrical light guide portion, one end of the semi-cylindrical light guide portion is provided with an inclined end face, a light inlet portion is fixedly connected to the surface of the inclined end face, a funnel-shaped groove is provided in the middle of the light inlet portion, a convex light inlet protrusion is fixedly connected to the bottom of the groove, the other end of the semi-cylindrical light guide portion is fixedly connected to a hemispherical light outlet portion, a light guide protrusion fixedly connected to the bottom of the semi-cylindrical light guide portion is further provided on the inner side of the light outlet portion, and the light guide protrusion is integrally connected to the light outlet portion.

[0007] As a preferred solution of the vehicle lamp of the present invention, the bottom of the groove is arranged parallel to the inclined end face, the top of the inclined end face is tangent to the top of the light input part, the bottom of the inclined end face is tangent to the bottom of the light input part, and the diameter of the light input part is smaller than the diameter of the low beam light guide body.

[0008] As a preferred solution of the vehicle lamp of the present invention, the bottom of the light-guiding protrusion is an arc-shaped surface, and the widest part of the light-guiding protrusion is the same as the diameter of the light-inlet portion. When the light enters the light-inlet portion, it is gathered by the cylindrical light-guiding portion, and the intersection of the gathered light rays is located at the connection between the end of the light-guiding protrusion and the cylindrical light-guiding portion. The light is then guided by the cylindrical light-guiding portion and enters the light-exit portion, and then is emitted downward at a certain angle to form a low beam.

[0009] A mounting structure for a low-beam light guide, used for mounting the low-beam light guide described in any one of the above items, further comprising a mounting sleeve sleeved on the outside of a semi-cylindrical light guide portion, wherein the inner wall of the mounting sleeve is tightly fitted with the semi-cylindrical light guide portion, the light guide protrusion and the inclined end surface, the low-beam light guide body and the light output portion are both placed on the outside of the mounting sleeve, and a heat dissipation mechanism is provided on the outside of the mounting sleeve.

[0010] As a preferred solution of the vehicle lamp of the present invention, the mounting sleeve is made of metal, the heat dissipation mechanism is a plurality of strip grooves opened on the surface of the mounting sleeve, and the groove depth of the strip grooves is smaller than the radius of the semi-cylindrical light guide portion.

[0011] As a preferred solution of the vehicle lamp of the present invention, a retaining ring is fixedly connected to the outside of the proximal end of the installation sleeve.

[0012] A vehicle lamp, a lamp body formed by any of the above-mentioned low-beam light guides being installed through the installation structure described in any of the above-mentioned items, and also includes a lamp housing, a mounting seat being fixedly installed inside the lamp housing, a plurality of mounting cavities being provided on the surface of the mounting seat, a plurality of strip protrusions matching the width of the strip grooves being fixedly connected inside the cavity of the mounting cavity, the mounting sleeve being inserted into the mounting cavity, the strip protrusions being tightly fitted with each other, a pressing plate being provided on the front side of the mounting seat, a plurality of openings being provided on the surface of the pressing plate, the openings being sleeved on the outside of the light emitting portion and pressing the retaining ring, a back plate being installed on the back side of the lamp housing, a lamp board being installed on the inner side of the back plate, a plurality of luminous lamp beads being installed on the surface of the lamp board, and the luminous ends of the luminous lamp beads being placed inside the grooves.

[0013] As a preferred solution of the vehicle lamp of the present invention, the diameter of the opening is smaller than the diameter of the light emitting portion, and the pressing plate is fixedly connected to the mounting seat by screws.

[0014] As a preferred solution of the vehicle lamp of the present invention, the mounting seat and the back plate are both made of metal, the outer side of the lamp housing is fixedly connected to a fixing ear, and a mounting hole is provided on the surface of the fixing ear.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1) The low beam light guide body of the present invention is made of silicone material and is integrally injection molded, which can be mass-produced to improve efficiency and reduce costs. At the same time, the low beam light guide body is provided with a funnel-shaped groove through the light inlet portion, and the light inlet protrusion at the bottom of the groove helps to collect light more effectively, so that more light can enter the light guide, and then the light is collected by the semi-cylindrical light guide portion. When the light enters the light inlet portion, the intersection of the light is located at the connection between the end of the light guide protrusion and the cylindrical light guide portion. After being conducted by the semi-cylindrical light guide portion, the light enters the light outlet portion. Since the light outlet portion is provided with a light guide protrusion, The light can be emitted downward at a certain angle according to the requirements of low-beam lighting, thus achieving reasonable light distribution and providing good low-beam lighting effects. By precisely controlling the propagation path of the light, the scattering and unnecessary loss of light are avoided, the utilization efficiency of light is improved, and a clear and appropriate close-range lighting field of vision is provided for the driver, while reducing glare interference to other road users. Moreover, the low-beam light guide made of silicone has a suitable refractive index, which can effectively guide the light to propagate inside, reduce light loss, avoid yellowing or aging, and increase the service life of the headlights.

[0017] 2) The mounting sleeve of the low beam light guide of the present invention is sleeved on the outside of the semi-cylindrical light guide portion, and the wall of the mounting sleeve is tightly fitted with the semi-cylindrical light guide portion, the light guide protrusion and the inclined end face, thereby ensuring the stable installation of the light guide. The metal mounting sleeve has good thermal conductivity, and the heat dissipation mechanism formed by a plurality of strip grooves can effectively dissipate the heat generated by the light guide when it is working. The mounting seat and the back plate are also made of metal material, which further enhances the heat dissipation performance, avoids the influence of heat accumulation on the performance and life of the lamp, improves the stability and reliability of the lamp, and ensures the overall performance of the low beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the low beam light guide proposed for the invention;

[0019] Figure 2 One of the schematic diagrams of the structure of the low beam light guide proposed for the invention;

[0020] Figure 3 The second schematic diagram of the structure of the low beam light guide proposed for the invention;

[0021] Figure 4 A schematic diagram of the installation structure proposed for the invention;

[0022] Figure 5 A schematic diagram of the mounting sleeve structure proposed for the invention;

[0023] Figure 6 A schematic diagram of the vehicle light structure proposed for the invention;

[0024] Figure 7 A schematic diagram of the disassembly of the headlights proposed for the invention;

[0025] Figure 8 Proposed for invention Figure 7 An enlarged schematic diagram at position A;

[0026] Fig. 9 A schematic diagram of the optical path of the low beam light guide proposed for the invention;

[0027] Fig.10 A light source analysis diagram of the low beam light guide proposed for the invention;

[0028] Fig.11 A road lighting diagram of the low beam light guide proposed for the invention.

[0029] In the figure: 100, low beam light guide body; 110, cylindrical light guiding part; 111, inclined end face; 120, light inlet part; 121, groove; 122, light inlet protrusion; 130, light outlet part; 131, light guiding protrusion; 200, mounting sleeve; 210, heat dissipation mechanism; 211, strip groove; 220, retaining ring; 300, lamp housing; 310, mounting seat; 320, mounting cavity; 321, strip protrusion; 330, pressing plate; 331, opening; 340, back plate; 341, lamp board; 342, luminous lamp beads; 350, fixing ear; 351, mounting hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0031] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0032] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Reference Figures 1 to 11 A low-beam light guide component comprises a low-beam light guide component body 100 integrally injection-molded by using a silicone material, the low-beam light guide component body 100 comprises a semi-cylindrical light guide portion 110, one end of the semi-cylindrical light guide portion 110 is provided with an inclined end surface 111, a light inlet portion 120 is fixedly connected to the surface of the inclined end surface 111, a funnel-shaped groove 121 is provided in the middle of the light inlet portion 120, a convex light inlet protrusion 122 is fixedly connected to the bottom of the groove 121, the other end of the semi-cylindrical light guide portion 110 is fixedly connected to a hemispherical light outlet portion 130, a light guide protrusion 131 fixedly connected to the bottom of the semi-cylindrical light guide portion 110 is further provided on the inner side of the light outlet portion 130, and the light guide protrusion 131 is integrally connected to the light outlet portion 130.

[0035] Specifically, the low beam light guide body 100 is integrally injection molded from a silicone material, so that the semi-cylindrical light guide portion 110, the light inlet portion 120 and the light outlet portion 130 can be quickly molded, and the integrity and accuracy of the structure of each part can be effectively guaranteed. The semi-cylindrical light guide portion 110 serves as the main channel for light transmission, and the inclined end surface 111 at one end thereof provides a specific low beam angle for the light inlet portion 120. The funnel-shaped groove 121 can play a preliminary role in gathering the light, similar to a small concentrator, and the groove 121 groove The light-inlet protrusion 122 at the bottom can further enhance the light-gathering effect, so that the light can enter the light guide body 100 more concentratedly, and the light-guiding protrusion 131 on the inner side of the light-emitting portion 130 is integrally connected with the light-emitting portion 130, which can effectively ensure the stability of the structure, and the light-guiding protrusion 131 plays a role in guiding the light during the light propagation process, so that after the light is transmitted through the semi-cylindrical light-guiding portion 110, it can be emitted from the light-emitting portion 130 according to the requirements of low-beam lighting, forming a low-beam lighting effect (see Fig. 9 and Fig.10 ).

[0036] In this embodiment: the bottom of the groove 121 is arranged parallel to the inclined end face 111, and the top of the inclined end face 111 is tangent to the top of the light input portion 120, the bottom of the inclined end face 111 is tangent to the bottom of the light input portion 120, and the diameter of the light input portion 120 is smaller than the diameter of the low beam light guide body 100.

[0037] Specifically, the bottom of the groove 121 is arranged parallel to the inclined end surface 111, so that the light can maintain a relatively stable propagation direction when entering the light-inlet portion 120, and the top of the inclined end surface 111 is tangent to the top of the light-inlet portion 120, and the bottom is tangent to the bottom of the light-inlet portion 120. The tangent relationship ensures a smooth transition between the light-inlet portion 120 and the inclined end surface 111, avoiding unnecessary refraction or reflection of the light at this connection, thereby reducing light loss;

[0038] The diameter of the light inlet portion 120 is smaller than the diameter of the low beam light guide body 100. The difference in diameter helps to form a shading effect around the light inlet portion 120, so that the light entering the light inlet portion 120 is more concentrated, reducing interference from external light, and further improving the efficiency of light collection.

[0039] In this embodiment: the bottom of the light-guiding protrusion 131 is an arc-shaped surface, and the widest part of the light-guiding protrusion 131 is the same as the diameter of the light-inlet portion 120. When the light enters the light-inlet portion 120, it is collected by the cylindrical light-guiding portion 110, and the intersection of the collected light is located at the connection between the end of the light-guiding protrusion 131 and the cylindrical light-guiding portion 110. The light is then guided by the cylindrical light-guiding portion 110 and enters the light-emitting portion 130, and then is emitted downward at a certain angle to form a low beam.

[0040] Specifically, the bottom of the light-guiding protrusion 131 is an arc-shaped surface, so that the light can be more smoothly transferred to the light-emitting portion 130 after being transmitted through the semi-cylindrical light-guiding portion 110;

[0041] The widest part of the light-guiding protrusion 131 is the same as the diameter of the light-inlet portion 120. When light enters the light-inlet portion 120, the semi-cylindrical light-guiding portion 110 can collect the light. By utilizing the special structure and optical characteristics, the light is collected toward the connection between the end of the light-guiding protrusion 131 and the cylindrical light-guiding portion 110. After the light is concentrated at the intersection, it is guided into the light-exiting portion 130 through the semi-cylindrical light-guiding portion 110. The light-guiding protrusion 131 on the inner side of the light-exiting portion 130 changes the propagation direction of the light, so that the light is emitted downward at a certain angle, thereby forming a light distribution that meets the requirements of low-beam lighting, and providing the driver with a suitable close-range lighting field of view (such as Fig.11 shown).

[0042] A low beam light guide installation structure is used for installing any of the low beam light guides mentioned above, and also includes a mounting sleeve 200 that is sleeved on the outside of a semi-cylindrical light guide portion 110, the inner wall of the mounting sleeve 200 is tightly fitted with the semi-cylindrical light guide portion 110, the light guide protrusion 131 and the inclined end surface 111, the low beam light guide body 100 and the light output portion 130 are both placed on the outside of the mounting sleeve 200, and a heat dissipation mechanism 210 is provided on the outside of the mounting sleeve 200.

[0043] Specifically, the mounting sleeve 200 is sleeved on the outside of the semi-cylindrical light-guiding portion 110, and the inner wall of the mounting sleeve 200 fits tightly with the semi-cylindrical light-guiding portion 110, the light-guiding protrusion 131 and the inclined end face 111, which can ensure the stability of the position of the low-beam light guide in the mounting sleeve 200 and prevent the light guide from shaking or shifting during use, thereby ensuring the accuracy of the light propagation path; the low-beam light guide body 100 and the light output portion 130 are both placed on the outside of the mounting sleeve 200, which not only ensures the normal operation of the light guide, but also facilitates the heat dissipation mechanism 210 on the outside of the mounting sleeve 200 to dissipate heat from the light guide, thereby avoiding heat accumulation inside the light guide and affecting the performance and life of the light guide.

[0044] In this embodiment, the mounting sleeve 200 is made of metal, the heat dissipation mechanism 210 is a plurality of strip grooves 211 formed on the surface of the mounting sleeve 200 , and the groove depth of the strip grooves 211 is smaller than the radius of the semi-cylindrical light guide portion 110 .

[0045] Specifically, the mounting sleeve 200 made of metal material has good thermal conductivity and can quickly conduct away the heat generated by the light guide when it is working; and the heat dissipation mechanism 210 formed by multiple strip grooves 211 can increase the surface area of ​​the mounting sleeve 200, so that the heat can be more effectively dissipated to the surrounding environment. At the same time, the groove depth of the strip groove 211 is smaller than the radius of the semi-cylindrical light guide part 110, which not only ensures the heat dissipation effect of the heat dissipation mechanism 210, but also will not affect the overall structural strength of the mounting sleeve 200, ensuring that the mounting sleeve 200 can be stably mounted on the outside of the semi-cylindrical light guide part 110, providing stable support and good heat dissipation conditions for the light guide.

[0046] In this embodiment, a retaining ring 220 is fixedly connected to the outer side of the proximal end of the installation sleeve 200 .

[0047] Specifically, when the installation sleeve 200 is inserted into the installation cavity 320, the retaining ring 220 can cooperate with the pressure plate 330 to determine the insertion depth of the installation sleeve 200 and ensure the accuracy of the installation. At the same time, the retaining ring 220 can also prevent the installation sleeve 200 from accidentally falling out of the installation cavity 320 after installation, further improving the stability of the installation structure.

[0048] A vehicle lamp, a lamp body formed by any of the above-mentioned low-beam light guides is installed by any of the above-mentioned installation structures, and also includes a lamp housing 300, a mounting base 310 is fixedly installed inside the lamp housing 300, a plurality of mounting cavities 320 are provided on the surface of the mounting base 310, a plurality of strip protrusions 321 that are adapted to the width of the strip groove 211 are fixedly connected inside the cavity of the mounting cavity 320, the mounting sleeve 200 is inserted into the mounting cavity 320, the strip protrusions 321 are tightly fitted with the strip protrusions 321, a pressing plate 330 is provided on the front side of the mounting base 310, a plurality of openings 331 are provided on the surface of the pressing plate 330, the openings 331 are sleeved on the outside of the light emitting portion 130 and press the retaining ring 220, a back plate 340 is installed on the back side of the lamp housing 300, a lamp board 341 is installed on the inner side of the back plate 340, a plurality of light-emitting lamp beads 342 are installed on the surface of the lamp board 341, and the light-emitting ends of the light-emitting lamp beads 342 are placed inside the groove 121.

[0049] Specifically, the mounting seat 310 is installed inside the lamp housing 300, and the multiple mounting cavities 320 on the surface of the mounting seat 310 can be used to accommodate the mounting sleeve 200. When the mounting sleeve 200 is inserted into the mounting cavity 320, the strip-shaped protrusion 321 inside the mounting cavity 320 is tightly sleeved with the strip-shaped groove 211 on the surface of the mounting sleeve 200, which can not only ensure the stability of the mounting sleeve 200 and the mounting cavity 320, but also increase the contact area between the two, thereby improving the efficiency of heat conduction;

[0050] The pressing plate 330 is sleeved on the outside of the light emitting portion 130 through the opening 331 and presses the retaining ring 220 tightly, so that the pressing plate 330 can firmly fix the mounting sleeve 200 in the mounting cavity 320 to prevent it from loosening;

[0051] The set back plate 340 provides installation support for the light board 341, and the light-emitting end of the light-emitting lamp bead 342 of the light board 341 is placed inside the groove 121, ensuring that the light emitted by the light-emitting lamp bead 342 can accurately enter the light inlet part 120, and form a low beam after being transmitted by the low beam light guide, thereby realizing the low beam lighting function of the entire vehicle lamp.

[0052] In this embodiment, the diameter of the opening 331 is smaller than the diameter of the light emitting portion 130 , and the pressing plate 330 is fixedly connected to the mounting seat 310 by screws.

[0053] Specifically, when the pressure plate 330 is installed with the mounting base 310 by means of screws, due to the size difference between the opening 331 and the light emitting portion 130, the pressure plate 330 can form a certain pressure around the light emitting portion 130, thereby tightly fixing the mounting sleeve 200 in the mounting cavity 320, thereby ensuring the stability of the low beam light guide mounting structure and ensuring the normal operation of the low beam lighting headlight.

[0054] In this embodiment, the mounting base 310 and the back plate 340 are both made of metal. The outer side of the lamp housing 300 is fixedly connected to the fixing ear 350 , and a mounting hole 351 is opened on the surface of the fixing ear 350 .

[0055] Specifically, the metal mounting base 310 and the back plate 340 have good thermal conductivity, which helps to dissipate the heat generated by the light guide and the light board 341 during operation; and the set fixing ears 350 and mounting holes 351 can conveniently install the headlights on the vehicle, using the headlights to provide the driver with stable low beam lighting.

[0056] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0057] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A low beam light guide, characterized in that: The invention comprises a low-beam light guide body (100) which is integrally injection-molded using a silicone material, wherein the low-beam light guide body (100) comprises a semi-cylindrical light guide portion (110), one end of the semi-cylindrical light guide portion (110) is provided with an inclined end surface (111), a light inlet portion (120) is fixedly connected to the surface of the inclined end surface (111), a funnel-shaped groove (121) is provided in the middle of the light inlet portion (120), a convex light inlet protrusion (122) is fixedly connected to the bottom of the groove (121), the other end of the semi-cylindrical light guide portion (110) is fixedly connected to a hemispherical light outlet portion (130), a light guide protrusion (131) fixedly connected to the bottom of the semi-cylindrical light guide portion (110) is further provided on the inner side of the light outlet portion (130), and the light guide protrusion (131) is integrally connected to the light outlet portion (130).

2. A low beam light guide according to claim 1, characterized in that: The bottom of the groove (121) is arranged parallel to the inclined end surface (111), the top of the inclined end surface (111) is tangent to the top of the light-inlet portion (120), the bottom of the inclined end surface (111) is tangent to the bottom of the light-inlet portion (120), and the diameter of the light-inlet portion (120) is smaller than the diameter of the low-beam light guide body (100).

3. The low beam light guide according to claim 1, characterized in that: The bottom of the light-guiding protrusion (131) is an arc-shaped surface, and the widest part of the light-guiding protrusion (131) is the same as the diameter of the light-inlet portion (120). When light enters the interior of the light-inlet portion (120), it is collected by the cylindrical light-guiding portion (110), and the intersection of the collected light is located at the connection between the end of the light-guiding protrusion (131) and the cylindrical light-guiding portion (110). The light is then guided by the cylindrical light-guiding portion (110) and enters the light-outlet portion (130), and then is emitted downward at a certain angle, forming a low beam.

4. A low beam light guide installation structure, used for installing the low beam light guide as claimed in any one of claims 1 to 3, characterized in that: It also includes a mounting sleeve (200) sleeved on the outside of the semi-cylindrical light guide portion (110), wherein the inner wall of the mounting sleeve (200) is tightly fitted with the semi-cylindrical light guide portion (110), the light guide protrusion (131) and the inclined end surface (111), the low beam light guide body (100) and the light output portion (130) are both placed on the outside of the mounting sleeve (200), and a heat dissipation mechanism (210) is provided on the outside of the mounting sleeve (200).

5. The installation structure of a low beam light guide according to claim 4, characterized in that: The installation sleeve (200) is made of metal material, and the heat dissipation mechanism (210) is a plurality of strip grooves (211) provided on the surface of the installation sleeve (200), and the groove depth of the strip grooves (211) is less than the radius of the semi-cylindrical light guide portion (110).

6. The installation structure of a low beam light guide according to claim 4, characterized in that: A retaining ring (220) is fixedly connected to the outside of the proximal end of the installation sleeve (200).

7. A vehicle lamp, wherein a lamp body formed by a low beam light guide member according to any one of claims 1 to 3 is mounted by means of a mounting structure according to any one of claims 4 to 6, characterized in that: The lamp housing (300) is also comprised of a lamp housing (300), wherein a mounting seat (310) is fixedly mounted inside the lamp housing (300), a plurality of mounting cavities (320) are provided on the surface of the mounting seat (310), a plurality of strip-shaped protrusions (321) adapted to the width of the strip-shaped groove (211) are fixedly connected inside the cavity of the mounting cavity (320), the mounting sleeve (200) is inserted into the mounting cavity (320), the strip-shaped protrusions (321) are tightly sleeved with the strip-shaped protrusions (321), and the front of the mounting seat (310) is fixedly mounted with the strip-shaped protrusions (321). A pressure plate (330) is provided on the surface of the pressure plate (330), and a plurality of openings (331) are opened on the surface of the pressure plate (330). The openings (331) are sleeved on the outside of the light emitting portion (130) and press the retaining ring (220). A back plate (340) is installed on the back side of the lamp housing (300), and a lamp board (341) is installed on the inner side of the back plate (340). A plurality of light-emitting lamp beads (342) are installed on the surface of the lamp board (341), and the light-emitting ends of the light-emitting lamp beads (342) are placed inside the groove (121).

8. The vehicle lamp according to claim 7, characterized in that: The diameter of the opening (331) is smaller than the diameter of the light emitting portion (130), and the pressing plate (330) is fixedly connected to the mounting seat (310) via screws.

9. The vehicle lamp according to claim 7, characterized in that: The mounting seat (310) and the back plate (340) are both made of metal material; the outer side of the lamp housing (300) is fixedly connected to a fixing ear (350); and a mounting hole (351) is provided on the surface of the fixing ear (350).

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