Rotary supporting structure of lamp

Abstract

The utility model relates to a rotary supporting structure of a lamp, and belongs to the technical field of lighting devices. The structure comprises a fixed part and a rotating assembly, the fixed part comprises a transmission gear ring and a clamping ring, and the rotating assembly comprises a supporting cover and a mounting base. The supporting cover is connected with the mounting base, the transmission gear ring is clamped between the supporting cover and the mounting base, and the rotating assembly can rotate relative to the fixing piece. A first rolling matching pair is arranged between the supporting cover and the fixing piece, a second rolling matching pair is arranged between the installation base and the fixing piece, rolling bodies are contained in the two matching pairs, and conversion from sliding friction to rolling friction is achieved. In addition, the limiting ring is additionally arranged to provide radial auxiliary guiding, the diameter of the first annular raceway is larger than that of the second annular raceway, virtual conical supporting is formed, and the anti-overturning capacity is enhanced. The structure has the advantages of small rotation resistance, high positioning precision, small abrasion, compact structure, reliable assembly and pre-tightening and the like, and is suitable for the light, thin and high-stability adjustment requirements of modern lamps.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting device technical field, concretely relates to a rotary bearing structure of lamp. BACKGROUND

[0002] In the lamp design, the rotary bearing structure realizing angle adjustment is the key function component. The prior art has many problems such as big friction resistance, unstable operation, easy wear and redundant structure. The contact surface of the common sliding friction structure is easy to produce gap after long-term use due to wear, which directly affects the adjustment accuracy and stability.

[0003] To solve the problems of friction and wear, the related improvement scheme such as Chinese utility model patent CN216384060U adopts the structure of damping washer cooperating with spring preloading to avoid direct friction of metal parts. However, the scheme still essentially depends on the sliding friction of damping material, and has inherent defects such as easy rotation torque affected by environmental aging, material fatigue deformation and limited adjustment accuracy. In addition, the traditional rotary bearing structure often realizes the functions of transmission, bearing and guiding by multiple separate parts, resulting in loose structure, many parts, large axial size, which is difficult to meet the design requirements of modern lamp thinning and integration.

[0004] Therefore, there is an urgent need in the art for a rotary bearing scheme, which not only fundamentally changes the sliding friction into low-resistance and durable rolling friction, but also highly integrates the functions of gear transmission, bidirectional rolling bearing and radial sliding guiding through ingenious structure design, so as to realize good performance and ultra-thin axial size in a compact space. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above-mentioned defects of the prior art, and provides a lamp rotary bearing structure which is smooth, stable and reliable in operation, compact in structure and long in service life.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A rotary bearing structure of lamp, comprising a fixed part and a rotating assembly. The fixed part comprises a transmission gear ring, and the inner ring of the transmission gear ring is provided with a tooth-shaped structure; the rotating assembly comprises a bearing cover and a mounting seat, the bearing cover is connected with the mounting seat and clamps the transmission gear ring therebetween, and the rotating assembly can rotate relative to the fixed part; a first rolling pair is arranged between the bearing cover and the fixed part; a second rolling pair is arranged between the mounting seat and the fixed part; the first rolling pair and the second rolling pair both contain rolling bodies.

[0008] Preferably, the rolling body is a steel ball.

[0009] Preferably, the first rolling fit pair comprises a first set of recesses provided on the bottom surface of the bearing cover, and the rolling body portion is accommodated in the first set of recesses.

[0010] Further, the first rolling fit pair further comprises a first annular raceway provided on the transmission ring gear, and the rolling body portion is accommodated in the first annular raceway.

[0011] Preferably, the second rolling fit pair comprises a second annular raceway provided on the top surface of the mounting seat, and the rolling body portion is accommodated in the second annular raceway.

[0012] Further, the fixing member further comprises a snap ring fixed below the transmission ring gear, and the second rolling fit pair further comprises a second set of recesses provided on the bottom surface of the snap ring, and the rolling body portion is accommodated in the second set of recesses.

[0013] Preferably, the diameter of the first annular raceway is greater than the diameter of the second annular raceway.

[0014] Preferably, a limit ring is arranged between the bearing cover and the transmission ring gear.

[0015] Preferably, the tooth structure of the transmission ring gear is helical tooth.

[0016] Preferably, the snap ring is fixed below the transmission ring gear by a screw.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. Extremely low rotation friction and high precision: the double rolling fit pairs arranged between the transmission ring gear and the bearing cover and between the snap ring and the mounting seat convert the traditional sliding friction into rolling friction, which significantly reduces the rotation resistance. This makes the angle adjustment of the lamp extremely easy and smooth, and enables precise angle positioning and retention.

[0019] 2. Excellent wear resistance and long service life: the wear rate of rolling friction is much lower than that of sliding friction, and the wear of key load-bearing components such as the transmission ring gear, the bearing cover and the mounting seat is extremely small. This structure effectively avoids the generation of fitting clearance due to long-term use and wear, thereby eliminating the problems of shaking, noise and functional failure caused thereby, and greatly prolonging the service life.

[0020] 3. High stiffness and anti-overturning stability: the differential design of large upper (first annular raceway) diameter and small lower (second annular raceway) diameter, together with the upper and lower rows of rolling bodies, forms a virtual conical bearing system. This layout greatly enhances the ability of the structure to withstand radial load and overturning moment, improves the overall rigidity and running stability, and prevents the rotating assembly from shaking or jamming during adjustment.

[0021] 4. High integration and ultra-thin design: ingeniously integrating gear transmission interface (transmission gear ring), bidirectional rolling bearing (first and second rolling fit pairs) and radial auxiliary guide (limiting ring) and other functions in a single compact module composed of transmission gear ring, support cover and mounting seat. This design discards redundant parts, realizes extremely thin axial size, and is very suitable for the light and thin demand of modern lamps.

[0022] 5. Easy assembly and reliable pre-tightening: by controlling the pit depth to be slightly smaller than the diameter of the steel ball, an elastic pre-pressing of the rolling body is naturally formed after assembly locking. This pre-pressing state can actively eliminate the axial working gap during the assembly stage, ensuring that the product is in a "zero gap" tight fitting state when leaving the factory, running without noise, and good hand feeling consistency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a sectional view of the utility model.

[0024] Fig. 2 is a first exploded structure schematic view of the utility model.

[0025] Fig. 3 is a second exploded structure schematic view of the utility model. DETAILED DESCRIPTION

[0026] The utility model will be further described in detail below in combination with the drawings.

[0027] Please refer to Figs. 1 to 3 The lamp rotating support structure provided by the utility model aims to construct a high-performance and compact rotating motion system mainly based on double rolling friction and supplemented by radial sliding guide through a set of highly integrated mechanical combination.

[0028] The structure mainly includes two parts of the fixed part 100 and the rotating assembly 200. The core component of the fixed part 100 is the transmission gear ring 1, which is preferably made of metal material, and the inner ring is precisely processed with a tooth structure 11. The tooth structure 11 is preferably a helical tooth with better transmission stability, which is used for meshing with the pinion of the external driving motor. The transmission gear ring 1 is a fixed component in this structure and does not produce rotating motion. Below the transmission gear ring 1, a snap ring 7 is usually arranged, which is reliably fixed on the transmission gear ring 1 by a screw 9, and together constitutes the fixed part 100.

[0029] The rotating assembly 200 constitutes the rotating body of the whole structure, which is connected by circumferentially distributed fasteners (such as screws) between the upper support cover 2 and the lower mounting base 3. After assembly, the support cover 2 and the mounting base 3 form a closed containing chamber together, which precisely clamps and constrains the transmission gear ring 1 therebetween. The rotating assembly 200 can rotate as a whole relative to the fixed transmission gear ring 1. This sandwich clamping structure is the fundamental guarantee to realize the axial dimension ultra-thin.

[0030] The core of realizing low friction and high precision rotation lies in the setting of the first rolling fit pair 4 and the second rolling fit pair 5. The first rolling fit pair 4 is located between the support cover 2 of the rotating assembly 200 and the transmission gear ring 1 of the fixed part 100, which is specifically formed by the first set of pits 21 on the bottom surface of the support cover 2 and the first annular raceway 12 on the top surface of the transmission gear ring 1. The second rolling fit pair 5 is located between the mounting base 3 of the rotating assembly 200 and the snap ring 7 of the fixed part 100, which is formed by the second annular raceway 31 on the top surface of the mounting base 3 at the lower part and the second set of pits 13 on the bottom surface of the snap ring 7 at the upper part.

[0031] High-precision steel balls are used as rolling bodies 6 and are contained in the raceway spaces formed by the two sets of pits and annular raceways. A key design feature is that the depths of the first set of pits 21 and the second set of pits 13 are precisely controlled to be slightly smaller than the diameter of the steel balls. This makes the upper and lower rows of steel balls slightly elastically pre-pressed after the support cover 2 and the mounting base 3 are locked by screws. The core technical effect of this pre-pressed state is that the axial working gap caused by the tolerance chain of the parts is actively eliminated during the assembly stage, so that the rotating system between the rotating assembly and the fixed part is in a close-fitting state with zero gap in the initial state, thereby completely avoiding the impact, abnormal noise and positioning drift caused by the gap during the starting, reversing or impact working conditions, which is the key to realizing high-quality hand feeling and long-term precision maintenance.

[0032] To further optimize the mechanical properties and stability of the structure, in one preferred embodiment of the utility model, the diameter of the first annular raceway 12 is designed to be larger than the diameter of the second annular raceway 31. This differential diameter layout with the upper part being larger and the lower part being smaller forms a virtual conical bearing surface in mechanics. The beneficial effect brought by this is to significantly enhance the ability of the structure to resist radial load and overturning moment, greatly inhibit the seesaw-type shaking prone to occur in traditional parallel bearings, and thus improve the rigidity and running stability of the overall structure.

[0033] As another important feature of the utility model, a limit ring 8 is arranged between the supporting cover 2 and the transmission gear ring 1. The limit ring 8 can be an independent annular component, the inner side of which cooperates with the outer cylindrical surface or specific step surface of the transmission gear ring 1, and the outer side of which cooperates with the inner wall of the supporting cover 2. The core function of the limit ring 8 is to provide redundant and effective radial constraint and auxiliary axial limit. It works cooperatively with the upper and lower rolling pairs to ensure the spatial position stability of the rotation axis of the rotating assembly, and can effectively prevent the relative dislocation of the rotating assembly and the fixed part when unexpected impact or large load is borne, further enhancing the reliability and safety of the structure.

[0034] The working principle of the utility model is briefly described as follows: when the external driving source is engaged with the fixed transmission gear ring 1 through the gear, the driving torque is transmitted to the rotating assembly 200 connected with the gear box or the driving mechanism, so that it starts to rotate relative to the fixed part 100. In this process, most of the axial and radial load is borne by the two rows of pre-pressed steel balls through pure rolling motion, providing extremely small and constant rotational resistance. At the same time, the limit ring 8 provides robust radial and axial auxiliary constraint. This rolling load and sliding limit cooperative mechanism is the physical basis for the realization of the ultimate smoothness, stability, high stiffness and high reliability of the structure.

[0035] As an extension and equivalent understanding of the technical scheme of the utility model, the setting position of the transmission gear ring 1 can be adapted and adjusted according to the specific driving installation requirements. In the above embodiment, the transmission gear ring 1 is arranged on the fixed part 100. At this time, the external driving gear produces a reaction force through engagement with the fixed gear ring, thereby driving the rotating assembly 200 to rotate. This scheme is suitable for installation scenarios where the external driving mechanism such as motor can move with the rotating assembly 200 or has relative motion relationship with it. Within the structure framework defined in the utility model claim, the transmission gear ring 1 can also be arranged on the rotating assembly 200. In this alternative embodiment, the external driving gear is directly engaged with the transmission gear ring on the rotating assembly 200, thereby achieving direct driving of the rotating assembly 200. Whether the transmission gear ring 1 is arranged on the fixed part 100 or the rotating assembly 200, the double rolling support and highly integrated structure formed by the transmission gear ring 1 and the core components such as the supporting cover 2, the mounting seat 3 and the rolling body 6 is the same, and can realize the beneficial effects of low friction, high precision, high stiffness and compactness expected by the utility model. Such equivalent transformation or adaptive modification based on the core concept of the utility model should fall within the protection scope of the utility model.

[0036] It should be noted that the protection scope of the utility model is defined by the claims. The details in the above specific embodiments, such as the application of helical teeth or the screw connection mode, are all examples for helping understanding, and are not limited to the utility model. Any equivalent replacement or modification within the technical scheme framework set forth in the claims of the utility model should be regarded as falling within the protection scope of the utility model.

Claims

1. A rotating bearing structure of a lamp, comprising a fixed part (100) and a rotating part (200), characterized in that: the fixed part (100) comprises a transmission ring gear (1), an inner ring of the transmission ring gear (1) is provided with a toothed structure (11); the rotating part (200) comprises a bearing cover (2) and a mounting seat (3), the bearing cover (2) is connected with the mounting seat (3) and clamps the transmission ring gear (1) therebetween, and the rotating part (200) can rotate relative to the fixed part (100); a first rolling pair (4) is arranged between the bearing cover (2) and the fixed part (100); a second rolling pair (5) is arranged between the mounting seat (3) and the fixed part (100); the first rolling pair (4) and the second rolling pair (5) each contain a rolling body (6).

2. A swivel support structure for a luminaire according to claim 1, characterized in that The rolling body (6) is a steel ball.

3. A swivel support structure for a luminaire according to claim 1, wherein The first rolling pair (4) comprises a first group of pits (21) arranged on a bottom surface of the bearing cover (2), and the rolling body (6) is partially contained in the first group of pits (21).

4. A rotary bearing structure for a luminaire according to claim 3, wherein The first rolling pair (4) further comprises a first annular raceway (12) arranged on the transmission ring gear (1), and the rolling body (6) is partially contained in the first annular raceway (12).

5. A swivel bearing structure for a luminaire according to claim 4, characterized in that The second rolling pair (5) comprises a second annular raceway (31) arranged on a top surface of the mounting seat (3), and the rolling body (6) is partially contained in the second annular raceway (31).

6. A swivel bearing structure for a luminaire according to claim 5, characterized in that The fixed part (100) further comprises a snap ring (7) fixed below the transmission ring gear (1); the second rolling pair (5) further comprises a second group of pits (13) arranged on a bottom surface of the snap ring (7), and the rolling body (6) is partially contained in the second group of pits (13).

7. A swivel support structure for a luminaire according to claim 5, wherein A diameter of the first annular raceway (12) is greater than a diameter of the second annular raceway (31).

8. A swivel support structure for a luminaire according to claim 1, wherein A limit ring (8) is arranged between the bearing cover (2) and the transmission ring gear (1).

9. A swivel support structure for a luminaire according to claim 1, wherein The toothed structure (11) of the transmission ring gear (1) is a helical tooth.

10. A swivel support structure for a luminaire according to claim 6, wherein The snap ring (7) is fixed below the transmission ring gear (1) by a screw (9).

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