A connecting structure of a transmission mechanism and a connecting rod mechanism for an electric table board

Abstract

The utility model discloses a kind of connecting structure for transmission mechanism and connecting rod mechanism of electric table board, the opposite sides of transmission mechanism are equipped with transmission shaft, internal thread is equipped in the inner cavity of transmission shaft, transmission shaft is crimped with the first connecting rod hole of middle lower connecting rod in connecting rod mechanism, the position of table board skeleton relative to transmission shaft has mounting hole, step bolt is sequentially passed through mounting hole, bolt shaft sleeve and first connecting rod hole and is threadedly connected with transmission shaft after it.The utility model can improve the strength, stability and carrying capacity of connecting rod mechanism, the clearance between transmission shaft and connecting rod contact surface can be reduced by crimping process, the effective contact area is increased, the stress distribution is more uniform, therefore the problem of local crack and fracture is solved, and the stability and carrying capacity of small table board are improved.

Description

Technical Field

[0001] This utility model belongs to the field of electric tabletops, specifically relating to a connection structure between a transmission mechanism and a linkage mechanism for an electric tabletop. Background Technology

[0002] An electric table is a small table installed on the back of a car seat that unfolds or retracts via a transmission mechanism. When unfolded, it provides a convenient platform for passengers to work, eat, or entertain themselves. When retracted, it saves space in the rear seats.

[0003] Existing electric tabletops, such as the invention application with application number "2025108314397" entitled "An Electrically Driven Folding Tabletop," have a transmission mechanism in which one end of the transmission shaft is keyed to the first left connecting rod in the linkage mechanism, and the other end is interference-fitted to the second right connecting rod. The second left connecting rod and the first right connecting rod are respectively connected to the tabletop assembly via pins. Although this connection structure can transmit the torque of the transmission mechanism to the linkage mechanism to drive the unfolding or folding of the small tabletop, it has the following problems:

[0004] 1. The first left connecting rod is connected to the drive shaft by a key. During the torque transmission process, it relies on the cooperation of the key and keyway. The force-bearing surface is narrow, so the load-bearing capacity is weak. Moreover, long-term rotation will cause the cooperation clearance to expand, causing the connecting rod to wobble relative to the drive shaft. At the same time, the keyway on the connecting rod and drive shaft will weaken its strength and reduce the effective cross-sectional area. Under long-term torque transmission, the keyway will break.

[0005] 2. The second right connecting rod is interference-fitted with the drive shaft. Interference fits require high machining accuracy and have a low tolerance for error. Furthermore, the clamping force is concentrated at the edge of the mating surface between the drive shaft and the connecting rod hole, which easily leads to localized stress concentration. Under long-term torque transmission, cracks are prone to appear at the edge of the connecting rod hole, directly reducing the strength of the connecting rod.

[0006] 3. The second left connecting rod and the first right connecting rod are connected to the table assembly by pins. At this time, the connecting rod is supported only by the pin on one side. Therefore, the connecting rod is in a cantilever state, and the stability and strength of the connecting rod are poor. Utility Model Content

[0007] The purpose of this utility model is to solve the above-mentioned problems by providing a connection structure for the transmission mechanism and linkage mechanism of an electric table. This connection structure can improve the strength, stability and load-bearing capacity of the linkage mechanism. The pressing process can reduce the gap between the transmission shaft and the connecting rod contact surface, increase the effective contact area, and make the stress distribution more uniform. Therefore, it solves the problems of cracks easily appearing at the edge of the connecting rod hole and breakage at the keyway, and improves the stability and load-bearing capacity of the small table.

[0008] To achieve the above objectives, this utility model provides a connection structure for a transmission mechanism and a linkage mechanism for an electric tabletop. The transmission mechanism has transmission shafts on opposite sides, and the inner cavity of the transmission shaft has an internal thread. The transmission shaft is pressed into the first linkage hole of the lower linkage in the linkage mechanism. The tabletop frame has mounting holes at positions relative to the transmission shafts. Step bolts pass through the mounting holes, bolt sleeves, and the first linkage hole in sequence and are then threaded into the transmission shaft.

[0009] As a further optimization, the pressing surface of the drive shaft relative to the lower connecting rod is a polygonal square key, and the drive shaft is pressed into the first connecting rod hole and connected to the lower connecting rod through the square key.

[0010] As a further optimization, the position of the drive shaft relative to the lower connecting rod is a first spline shaft, and the drive shaft is pressed into the first connecting rod hole through the first spline shaft to connect with the lower connecting rod.

[0011] As a further optimization, one side of the first spline shaft is a plane, and the rest of the circumference is a spline.

[0012] As a further optimization, a bolt bushing is press-fitted into the mounting hole, and the stepped bolt passes through the bolt bushing, bolt sleeve and first connecting rod hole in sequence before being threaded into the drive shaft.

[0013] As a further optimization, the overlap between the drive shaft and the first connecting rod hole is ≥5mm.

[0014] As a further optimization, the table frame has a mounting cavity at the position of the upper connecting rod in the linkage mechanism. A decorative frame is provided in the mounting cavity, and the upper connecting rod is provided in the decorative frame. The rotating shaft passes through the side wall of the mounting cavity and the decorative frame in sequence, and then inserts into the second connecting rod hole of the upper connecting rod, and connects with the side wall of the decorative frame and the mounting cavity on the other side. One end of the rotating shaft is a second spline shaft, and the other end is a round shaft. One end of the rotating shaft is in interference fit with the side wall of the mounting cavity through the second spline shaft, and the other end is in clearance fit with the side wall of the mounting cavity through the round shaft.

[0015] As a further optimization, a bushing is provided between the second connecting rod hole and the rotating shaft.

[0016] As a further optimization, the decorative frame has inwardly protruding limiting ribs on the side walls on opposite sides.

[0017] Advantages and beneficial effects of this utility model

[0018] 1. This utility model has a simple and compact structure. While improving the strength of the linkage mechanism, it saves the internal space of the small table and improves the load-bearing capacity of the small table, enabling the small table to withstand a force of more than 450N and a self-balancing load of more than 15kg.

[0019] 2. In this utility model, the two lower connecting rods are connected to the drive shaft by pressing, and a spline or square key is added to the pressing surface of the drive shaft to ensure a tight fit between the lower connecting rods and the drive shaft. The pressing process itself creates a tight fit and deformation engagement between the pressing surfaces. By compensating for minor machining errors through extrusion deformation, the gap between the contact surfaces can be reduced, the effective contact area can be increased, and the stress distribution can be made more uniform. Therefore, the tensile strength, shear strength, and load-bearing capacity are stronger, and the transmission accuracy is higher. The added spline or square key can further create a tight clamping force between the first connecting rod hole of the lower connecting rod and the drive shaft, resulting in a zero-clearance fit between the mating surfaces. Therefore, there will be no free rotation, relative displacement, loosening, or shaking during transmission, resulting in better fatigue stability. At the same time, the tight clamping force can be more evenly distributed across the entire pressing surface, thus further enhancing the load-bearing capacity and solving the problem of local cracking.

[0020] 3. In addition to being connected to the drive shaft by crimping, the two lower connecting rods in this utility model are also connected to the table frame by stepped bolts. Therefore, the strength of the lower connecting rods can be further improved, and the load-bearing capacity of the small table can be enhanced.

[0021] 4. This utility model applies anti-loosening adhesive to the threads of the step bolts, which can prevent the step bolts from coming loose during the use of the small table, thus preventing the table frame from separating from the lower connecting rod.

[0022] 5. This utility model has a mounting cavity at the position of the table frame relative to the upper connecting rod. A decorative frame is provided in the mounting cavity. After the rotating shaft passes through the side wall of the mounting cavity and the decorative frame in sequence, it is inserted into the second connecting rod hole of the upper connecting rod and connected to the decorative frame and the other side wall of the mounting cavity. Therefore, the upper connecting rod is connected to the table frame through the two ends of the rotating shaft, and the axial direction of the upper connecting rod is limited by the decorative frame to prevent the upper connecting rod from shaking when rotating. Therefore, the upper connecting rod has better stability and higher strength. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the electric small table provided in this embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the electric small table provided in this embodiment of the utility model after the decorative frame has been removed;

[0026] Figure 3This is an exploded view of the overall structure of the electric small table provided in this embodiment of the utility model (spline version of the transmission rod);

[0027] Figure 4 This is an exploded view of the overall structure of the electric small table provided in this embodiment of the utility model (transmission rod square key version);

[0028] Figure 5 This is a schematic diagram showing the relative position of the key at the end of the transmission rod and the lower connecting rod according to an embodiment of the present invention.

[0029] Figure 6 This is a frontal projection view of the electric small table provided in this embodiment of the utility model;

[0030] Figure 7 This is an embodiment of the present invention. Figure 6 A sectional view at point A (the end of the transmission rod is splined);

[0031] Figure 8 This is an embodiment of the present invention. Figure 7 Enlarged view of point B in the middle;

[0032] Figure 9 This is an embodiment of the present invention. Figure 6 Sectional view at point C;

[0033] Figure 10 This is an embodiment of the present invention. Figure 9 Enlarged view of point D in the middle.

[0034] Reference numerals: Transmission mechanism 1, transmission shaft 11, internal thread 111, square key 112, first spline shaft 113, plane 114, spline 115, shaft 116, coupling 117, extension shaft 118, linkage mechanism 2, lower connecting rod 21, first connecting rod hole 211, upper connecting rod 22, second connecting rod hole 221, table frame 3, mounting hole 31, mounting cavity 32, stepped bolt 4, bolt bushing 5, bolt sleeve 6, rotating shaft 7, second spline shaft 71, round shaft 72, decorative frame 8, limiting rib 81, and bushing 9. Detailed Implementation

[0035] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.

[0036] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] like Figures 1-5 As shown, a connection structure of a transmission mechanism and a linkage mechanism for an electric table is disclosed. The transmission mechanism 1 can drive the linkage mechanism 2 to swing, thereby enabling the small table to switch between an unfolded state and a retracted state. The transmission mechanism 1 has transmission shafts 11 on its left and right sides. These transmission shafts 11 can be shafts 116 extending outwards from the transmission mechanism 1 itself, or they can be connected to an extension shaft 118 via a coupling 117. In this embodiment, the transmission shaft 11 is the shaft 116 of the transmission mechanism 1 itself connected to the extension shaft 118 via the coupling 117. The extension shaft 118 can transmit the torque of the transmission mechanism 1 to the linkage mechanism 2. The end of the extension shaft 118 facing away from the coupling 117 is a polygonal square key 112 or a splined shaft 113. The spline 112 or square key 113 can create a tight clamping force between the first linkage hole 211 at the end of the lower linkage 21 and the extension shaft 118. The zero-clearance fit between the mating surfaces prevents freewheeling, relative displacement, loosening, or wobbling during transmission, resulting in better fatigue stability. The tight clamping force is also more evenly distributed across the entire mating surface, leading to stronger load-bearing capacity. The extension shaft 118 has an internal thread 111 in its inner cavity at one end with a square key 112 or spline shaft 113. This internal thread 111 mates with the stepped bolt 4. After being pressed into the first connecting rod hole 211 via the square key 112 or spline shaft 113, the extension shaft 118 connects to the lower connecting rod 21 in the connecting rod mechanism 2. The pressing action creates a tight fit and deformation engagement between the extension shaft 118 and the pressing surface of the first connecting rod hole 211. Simultaneously, the compression deformation compensates for minor machining errors, reducing the contact surface gap, increasing the effective contact area, and making the stress distribution more uniform. Therefore, it exhibits stronger tensile strength, shear strength, and load-bearing capacity, resulting in higher transmission accuracy.

[0038] like Figure 2 , Figure 3 , Figure 7 , Figure 8As shown, the table frame 3 has a mounting hole 31 at the position relative to the extension shaft 18. A bolt bushing 6 is pressed into the mounting hole 31. The bolt bushing 6 has a lubricating function. The stepped bolt 4 passes through the bolt bushing 6, the bolt sleeve 5 and the first connecting rod hole 211 in sequence and is inserted into the inner cavity of the extension shaft 118 and threadedly connected to the extension shaft 118. The bolt sleeve 5 can prevent axial shaking when the lower connecting rod 21 rotates. At the same time, the lower connecting rod 21 is connected to the table frame 3 through the stepped bolt 4, which can further improve the strength of the lower connecting rod 21 and improve the load-bearing capacity of the small table.

[0039] As a further optimization, the first spline shaft 113 is as follows: Figure 4 As shown, one side of the first spline shaft 113 is a plane 114, and the rest of the circumference is a spline 115. The plane 114 serves as a misalignment prevention surface to avoid the problem of asynchronous installation caused by inconsistent angles when the extension shafts 118 on both sides are installed, thus facilitating installation. On the other hand, it serves as a reference surface to ensure the accuracy of spline position during spline machining.

[0040] As a further optimization, the overlap between the extension shaft 118 and the first connecting rod hole 211 is ≥5mm to avoid insufficient strength between the lower connecting rod 21 and the extension shaft 118.

[0041] like Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, the table frame 3 has a mounting cavity 32 at the position of the upper connecting rod 22 in the linkage mechanism 2. A decorative frame 8 is housed within the mounting cavity 32, and the upper connecting rod 22 is housed within the decorative frame 8. The rotating shaft 7 passes sequentially through the mounting cavity 32 and one side wall of the decorative frame 8, then inserts into the second connecting rod hole 221 of the upper connecting rod 22, connecting to the decorative frame 8 and the other side wall of the mounting cavity 32. The upper connecting rod 22 is connected to the table frame 3 via both ends of the rotating shaft 7, thus providing better stability and higher strength. One end of the rotating shaft 7 is a second spline shaft 71, and the other end is a round shaft 72. One end of the rotating shaft 7 is in interference fit with the side wall of the mounting cavity 32 via the second spline shaft 71, while the other end is in clearance fit with the side wall of the mounting cavity 32 via the round shaft 72. This fit facilitates installation and, through interference fit, increases connection rigidity, ensuring no gaps between the mating surfaces and preventing the rotating shaft 7 from shifting or wobbling.

[0042] As a further optimization, bushings 8 are provided between the left and right ends of the second connecting rod hole 221 and the rotating shaft 7, and the bushings 8 have a lubricating function.

[0043] As a further optimization, the decorative frame 8 has limiting ribs 81 protruding upward in the direction of the upper connecting rod 22 on the side walls on opposite sides to limit the axial movement of the upper connecting rod 22.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the present utility model.

Claims

1. A connection structure between a transmission mechanism and a linkage mechanism for an electric tabletop, characterized in that... The transmission mechanism (1) has a transmission shaft (11) on both sides. The transmission shaft (11) has an internal thread (111) in its inner cavity. The transmission shaft (11) is pressed into the first connecting rod hole (211) of the lower connecting rod (21) in the linkage mechanism (2). The table frame (3) has a mounting hole (31) at the position relative to the transmission shaft (11). The stepped bolt (4) passes through the mounting hole (31), bolt bushing (5) and the first connecting rod hole (211) in sequence and is threaded to the transmission shaft (11).

2. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 1, characterized in that... The pressing surface of the drive shaft (11) relative to the lower connecting rod (21) is a polygonal square key (112). The drive shaft (11) is pressed into the first connecting rod hole (211) through the square key (112) and connected to the lower connecting rod (21).

3. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 1, characterized in that... The position of the drive shaft (11) relative to the lower connecting rod (21) is the first spline shaft (113). The drive shaft (11) is pressed into the first connecting rod hole (211) through the first spline shaft (113) and connected to the lower connecting rod (21).

4. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 3, characterized in that... One side of the first spline shaft (113) is a plane (114), and the rest of the circumference is a spline (115).

5. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 1, characterized in that... A bolt bushing (6) is press-fitted into the mounting hole (31). The stepped bolt (4) passes through the bolt bushing (6), the bolt sleeve (5) and the first connecting rod hole (211) in sequence and is then threadedly connected to the drive shaft (11).

6. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 1, characterized in that... The overlap between the drive shaft (11) and the first connecting rod hole (211) is ≥5mm.

7. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 1, characterized in that... The table frame (3) has a mounting cavity (32) at the position of the upper connecting rod (22) in the linkage mechanism (2). The mounting cavity (32) is provided with a decorative frame (8). The decorative frame (8) is provided with an upper connecting rod (22). The rotating shaft (7) passes through the side wall of the mounting cavity (32) and the decorative frame (8) in sequence, and then inserts into the second connecting rod hole (221) of the upper connecting rod (22), and connects with the other side wall of the decorative frame (8) and the mounting cavity (32). One end of the rotating shaft (7) is a second spline shaft (71), and the other end is a round shaft (72). One end of the rotating shaft (7) is interfered with the side wall of the mounting cavity (32) through the second spline shaft (71), and the other end is clearance-fitted with the side wall of the mounting cavity (32) through the round shaft (72).

8. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 7, characterized in that... A bushing (9) is provided between the second connecting rod hole (221) and the rotating shaft (7).

9. The connection structure of the transmission mechanism and linkage mechanism for an electric tabletop according to claim 7, characterized in that... The decorative frame (8) has inwardly protruding limiting ribs (81) on the side walls on opposite sides.

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