Folding table plate lifting device for vehicle

Abstract

The utility model relates to a folding table plate lifting device for a vehicle, and relates to the technical field of vehicle interior trim devices.The lifting device comprises a guide rail assembly, a bearing sliding block assembled on the guide rail assembly in a sliding mode, and two fixing bases symmetrically and fixedly arranged at the horizontal extending positions of the two sides of the top end of the guide rail assembly; and the constant-force driving mechanisms are symmetrically arranged on the two sides of the bearing sliding block and are connected and matched with the corresponding fixed bases. According to the lifting device, constant-speed motion control of a pure mechanical structure is achieved, space occupation and cost pressure of a traditional power system can be avoided, safety risks caused by sudden change of the speed can be fundamentally eliminated, and the lifting device has a dual promotion effect on improvement of the safety performance and market competitiveness of the table board.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle interior device, in particular to a folding table board lifting control device based on mechanical energy storage and precise guidance, which is especially suitable for power driving and motion stability control of built-in folding table board of passenger car seat. BACKGROUND

[0002] With the rapid development of intelligent and humanized design of automobile, folding table board as an important configuration to improve the comfort of passengers is increasingly widely used in car seats. At present, the lifting device driven by motor or assisted by gas spring is generally used in the market to realize the movement of the table board. This kind of technology can meet the basic lifting demand by providing power through electric power or gas pressure system. Some high-end vehicles also introduce sensors and servo control system to try to adjust the motion speed through closed-loop feedback. However, this kind of technology still has obvious defects in actual application, especially in the field of compact vehicles and cost-sensitive products, its limitations are more prominent.

[0003] The main defects of the prior art are concentrated in the adaptability of the power system and the motion control precision. The traditional motor driven device needs to arrange a high-power motor and a matching transmission mechanism, which not only occupies the already tight cabin space, but also significantly increases the material cost and assembly complexity. The gas spring scheme can simplify the structure, but it has inherent defects such as environmental temperature sensitivity and unstable actuation force caused by pressure decay. More seriously, both technologies are difficult to achieve ideal uniform motion control - motor driving is easy to cause end impact due to inertia when power is off, and gas spring produces acceleration mutation due to nonlinear change of pressure. These motion instability phenomena may have safety hazards, for example, colliding with the user when rising. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to overcome at least one deficiency of the prior art, and to provide a folding table board lifting device for vehicle, which realizes uniform motion control of pure mechanical structure, can avoid the space occupation and cost pressure of traditional power system, and fundamentally eliminate the safety risks caused by speed mutation, which has a double promoting effect on improving the safety performance and market competitiveness of the table board.

[0005] To achieve the above purpose, the present application relates to a folding table board lifting device for vehicle, which comprises a guide rail assembly, a bearing sliding block slidingly assembled on the guide rail assembly, two fixed bases symmetrically fixed and arranged at the top end of the guide rail assembly and horizontally extended on both sides, and a constant force driving mechanism symmetrically arranged on both sides of the bearing sliding block and connected and matched with the corresponding fixed base.

[0006] The constant force driving mechanism is composed of a fixed mounting base and a constant force volute spring arranged in the mounting base.

[0007] The outer end of the constant force volute spring extends out of the opening of the independent accommodating cavity and is fixedly connected to the fixed base.

[0008] The fixed base is provided with a number of hook positions corresponding to the number of constant force volute springs on the vertical wall surface.

[0009] Further, the output end side of the constant force volute spring in the constant force driving mechanism is provided with a linkage connecting piece for fixing the constant force volute spring near the fixed base side, and the linkage connecting piece is rigidly connected to each constant force volute spring through a countersunk screw.

[0010] Further, a rotatable shaft is arranged at the center of the independent accommodating cavity, and the shaft is fixedly connected to the inner end of the constant force volute spring.

[0011] Further, the linkage connecting piece is provided with an oval weight-reducing hole at the center.

[0012] Further, the guide rail assembly adopts a double-V-shaped section high-carbon steel slide rail, and a polytetrafluoroethylene self-lubricating liner containing molybdenum disulfide filler is arranged between the inner wall of the slide rail and the sliding part of the bearing block.

[0013] Further, the guide rail assembly and the bearing block are connected through an adjustable jacking mechanism, and the adjustable jacking mechanism, the jacking bolt, the jacking block and the elastic gasket are matched to realize accurate control of the frictional resistance value between the guide rail assembly and the bearing block. Since the elastic force provided by the constant force volute spring module is a constant value, changing the frictional resistance value can change the lifting speed, thereby meeting the use requirements of different persons and improving the use flexibility.

[0014] Compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0015] The constant force driving mechanism adopts a pure mechanical structure, compared with the traditional motor driving device, without the need to arrange a large power motor and a complex transmission mechanism, significantly saving the cabin space, reducing the material cost and assembly complexity; compared with the gas spring scheme, avoiding the environmental temperature sensitivity and pressure decay problem, fundamentally ensuring the stability of the actuating force, effectively eliminating the safety hidden danger caused by unstable power.

[0016] The adjustable top pressing mechanism is arranged to accurately control the frictional resistance value between the guide rail assembly and the bearing slider.

[0017] The above-listed benefits are not exhaustive of all advantages. Other potential benefits and detailed technical implementations will be further disclosed in the embodiments or other description parts of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Aspects of the present disclosure will become more fully understood from the detailed description and embodiments provided hereinafter and the accompanying drawings. The drawings shown in the accompanying drawings are sometimes simplified to show the relative positions, sizes and ranges of structures, etc. In the drawings:

[0019] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0020] Figure 2 is an exploded view of the structure of an embodiment of the present application. DETAILED DESCRIPTION

[0021] The present disclosure will be described with reference to the accompanying drawings, which show several embodiments of the present disclosure. It should be understood, however, that the present disclosure can be presented in many different forms and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully convey the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0022] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, the size of some features can be distorted for the sake of clarity.

[0023] It should be understood that the language used in the specification is only used to describe specific embodiments and is not intended to limit the present disclosure. All terms used in the specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description when appropriate.

[0024] As used in the specification, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the terms "includes," "including," "has," "having" and "contains," "containing," and "comprising" and variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises or contains an element or list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. The use of the term "and / or" includes the

[0025] Referring to the drawings Figure 1 and 2 A specific embodiment of the folding table board lifting device for a vehicle is as follows: the device is composed of a double-V-shaped section high-carbon steel guide rail assembly 1, a bearing sliding block 2 mounted on the guide rail assembly 1 and in sliding cooperation with the guide rail assembly 1, a fixed base 3 symmetrically distributed in the left and right side positions extending out horizontally from the top ends of the guide rail assembly 1, and a double-side constant force driving mechanism 4 mounted on the bearing sliding block 2 and in cooperation with the fixed base 3.

[0026] In the present embodiment, the bearing sliding block 2 is in sliding cooperation with the inner wall of the guide rail assembly 1 through a precisely processed dovetail groove structure, and the two sides thereof are rigidly connected with the mounting base bodies 401 of the constant force driving mechanism 4 through M8 grade high-strength bolts. The two mounting base bodies 401 are connected by a fixed block, so that the two mounting base bodies 401 have a stable structural positional relationship with the bearing sliding block 2.

[0027] In a more specific structural description, the contact surface of the guide rail assembly 1 and the bearing sliding block 2 is attached with a polytetrafluoroethylene gasket containing 20% molybdenum disulfide filler, the gasket has a thickness of 1.2 mm and is bonded with the metal base after being molded.

[0028] Specifically, the mounting base body 401 is cast from ADC12 aluminum alloy, and two groups of constant force volute springs 402 are arranged in the vertical axis direction inside the mounting base body 401. The spring material is selected from SUS301 stainless steel strips which are cold-rolled into a shape with a thickness of 0.3 mm and a width of 12 mm. The effective number of turns of each layer of spring is 8 turns, and the pre-tightening torque is set to 2.5 N·m.

[0029] The fixed base 3 is processed with a hook position structure corresponding to the number of constant force volute springs 402 on the vertical wall surface thereof, and each hook position is made of quenched 42CrMo alloy steel. In the present embodiment, the hook position structure is two, which are distributed upward and downward. Similarly, the constant force volute springs 402 in each constant force driving mechanism 4 are also two.

[0030] In some embodiments, a rotatable GCR15 bearing steel rotating shaft is arranged in the center of each independent accommodating cavity, the rotating shaft has a diameter of 8 mm, and the two ends thereof are connected with the side wall of the mounting base body through angular contact ball bearings. Specifically, the inner end of the constant force volute spring 402 is fixed in a rectangular key groove on the surface of the rotating shaft through a connecting structure. It should be noted that the above rotating shaft structure is not shown in the drawings.

[0031] It should also be understood that the constant force spiral spring 402 can be directly placed in an independent accommodating cavity, and the corresponding work purpose and effect can be achieved, but in this structure, the maximum stroke cannot exceed the unwound length of the constant force spiral spring 402, and is generally only 60% of the unwound length of the constant force spiral spring 402.

[0032] In the present embodiment, the outer end of the constant force spiral spring 402 extends to the mounting base 401 through the opening at the top of the accommodating cavity, and the terminal end is connected to a 304 stainless steel connecting piece (not shown in the drawing) with a thickness of 1.5 mm. The connecting piece is detachably connected with the hook structure in the fixed base 3 through the hole position.

[0033] In the present embodiment, the output ends of the constant force spiral springs 402 on both sides are mechanically coupled through the linkage connecting piece 403, which is cast in an I-shaped structure from ZL101A aluminum alloy, with the upper and lower wing plates having a thickness of 3 mm and a width of 20 mm, and the web plate having an elliptical weight-reducing hole with a major axis of 12 mm and a minor axis of 6 mm in the center. More specifically, the linkage connecting piece 403 is rigidly connected with the constant force spiral springs 402 through four groups of M5 countersunk head screws, and the screw pre-tightening torque is 1.2 N·m, and the cooperation with the threaded fastening glue prevents loosening.

[0034] On the basis of the above structure, in order to realize the adjustment of the lifting speed, an adjustable jacking mechanism (not shown in the view angle in the drawing) is also provided in the device of the present embodiment, which is composed of a 45# steel jacking bolt, a H62 brass jacking block, and a 65Mn spring steel gasket. The jacking bolt adopts M6 fine thread with a pitch of 0.75 mm, and the jacking block can be driven to move axially with an accuracy of 0.05 mm / revolution by adjusting the nut, thereby changing the contact pressure with the side wall of the guide rail. For example, when the adjusting nut is rotated by 180°, the friction resistance torque increases linearly from 0.8 N·m to 2.4 N·m, and the lifting speed of the bearing block decreases from 25 mm / s to 10 mm / s.

[0035] Although the exemplary embodiments of the present disclosure have been described, those skilled in the art should understand that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included in the protection scope of the present disclosure defined by the claims. The present disclosure is defined by the additional claims, and the equivalents of these claims are also included.

Claims

1. A vehicle folding table lifting device, characterized in that, The lifting device comprises a guide rail assembly, a bearing sliding block slidingly assembled on the guide rail assembly, two fixed bases symmetrically fixed at the top end of the guide rail assembly and horizontally extended on both sides, and a constant force driving mechanism symmetrically arranged on both sides of the bearing sliding block and connected with the corresponding fixed bases; The constant force driving mechanism is composed of a fixed mounting base and a constant force spiral spring arranged in the mounting base, wherein the mounting base is fixedly connected with the bearing sliding block through a bolt set, and at least two constant force spiral springs are arranged in the mounting base in a layered manner along the vertical axis direction, and each spiral spring is arranged in an independent accommodating cavity arranged in the mounting base; The outer end of the constant force spiral spring extends out of the opening of the independent accommodating cavity and is fixedly connected to the fixed base; The fixed base is provided with a hook position corresponding to the number of constant force spiral springs on the vertical wall surface; The output end side of the constant force spiral spring in the constant force driving mechanism is provided with a linkage connecting piece for fixing the constant force spiral spring near the fixed base, and the linkage connecting piece is rigidly connected with each constant force spiral spring through a countersunk screw, so that the output forces of the two sides of the spring form vector superposition at the linkage connecting piece.

2. A folding table board lifting device for a vehicle as defined in claim 1, characterized in that A rotatable shaft is arranged at the center of the independent accommodating cavity, and the shaft is fixedly connected with the inner end of the constant force spiral spring.

3. A folding table board lifting device for a vehicle as defined in claim 1, characterized in that The linkage connecting piece is provided with an oval weight-reducing hole at the center.

4. A folding table board lifting device for a vehicle as defined in claim 1, characterized in that The guide rail assembly adopts a double-V-shaped section high-carbon steel sliding rail, and a polytetrafluoroethylene self-lubricating liner containing molybdenum disulfide filler is arranged between the inner wall of the sliding rail and the sliding part of the bearing sliding block.

5. A folding table board lifting device for a vehicle as defined in claim 1, characterized by The guide rail assembly and the bearing sliding block are connected through an adjustable jacking mechanism, and the adjustable jacking mechanism, the jacking bolt, the jacking block and the elastic gasket are matched to realize accurate control of the friction resistance value between the guide rail assembly and the bearing sliding block.

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