Lead screw transmission gap eliminating structure

Abstract

The utility model discloses a lead screw transmission clearance eliminating structure, which belongs to the technical field of lead screw transmission, and comprises a sliding block, a lead screw, a spring and a nut, the sliding block is provided with an internal thread cylinder in threaded connection with the lead screw, and the nut which is in threaded connection with the lead screw and is opposite to the internal thread cylinder is clamped on the sliding block. A spring is arranged between the nut and the internal thread cylinder, and the spring provides compression bounce to abut against the portions, on the sides where the nut and the internal thread cylinder are located, of the sliding block towards the two sides. According to the eliminating structure, the sliding block and the nut can move outwards and abut against the lead screw under the action of compression rebound force of the spring, no matter the sliding block moves leftwards or rightwards, the sliding block and the lead screw can abut against each other all the time, and a transmission gap does not exist between the sliding block and the lead screw.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw rod transmission and provides a screw rod transmission gap elimination structure. Background Art

[0002] With the advent of the mobile Internet era, the number of mobile devices continues to rise. As one of the main power sources, motors are widely used in mobile devices. In some load products that require linear motion, such as automotive head-up displays (HUDs), when an external driver provides a pulse current of a corresponding frequency to the motor, the motor's iron core coil generates a changing magnetic field. The magnetic field generated by the iron core coil and the permanent magnet rotor generate a rotating magnetic force to mechanically rotate the permanent magnet rotor. The rotor converts the rotating torque into a linear thrust through a screw rod, a slider, etc., and then the slider pushes the load product to perform linear motion.

[0003] However, existing load products require high standards for their linear motion, such as high requirements for the movement accuracy of the slider, that is, due to the gap between the lead screw and the slider, after the slider moves to a certain position, when the slider returns, due to the gap factor caused by the lead screw slider, the slider will not move at a certain point in time while the motor is running. At this time, the slider movement accuracy will be inaccurate, thus affecting the load product's jamming or delay in linear motion. For details, see the attached Figure 1 As shown, in the existing screw rod and slider structure, when the screw rod is pressing the slider to move it to the right, there is no transmission gap between the screw rod and the left side of the slider. After the slider (load product) reaches the position and needs to move to the left, there will be a transmission gap between the screw rod and the right side of the slider. At this time, the slider will not move. After the screw rod contacts the slider, the slider starts to move to the left.

[0004] Therefore, it is necessary to study the transmission clearance problem existing in the screw rod and slider structure. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a screw transmission clearance elimination structure to solve the above-mentioned problem.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model provides a screw transmission clearance elimination structure, including a slider, a screw, a spring and a nut, the slider is provided with an internal threaded cylinder connected to the screw thread, the slider is clamped with a nut connected to the screw thread and opposite to the internal threaded cylinder, and a spring is provided between the nut and the internal threaded cylinder, and the spring provides a compression rebound force to press against the slider on both sides of the nut and the internal threaded cylinder. By adopting the above scheme, the transmission clearance between the screw and the slider is effectively eliminated through the action of the spring, and the accuracy of the overall movement is improved.

[0008] Optionally, the nut is composed of a base, a threaded sleeve, a clamp, and a guide column. The threaded sleeve and the guide column are respectively arranged on both sides of the base, and the clamp is arranged on the outer wall of the threaded sleeve. One end of the spring is sleeved on the guide column and abuts against the base. The slider is provided with a slot for clamping the clamp. In this way, the clamp of the nut can achieve radial limit, which is convenient for assembly, so that the nut and the slider can be quickly clamped and limited when assembled.

[0009] Optionally, the threaded sleeve adopts a half-screw sleeve structure, which has a simple design structure and is easy to shape, making it more flexible in adjustment and also convenient for installation and disassembly and injection molding.

[0010] Optionally, the nut is a plastic molded product, which helps to reduce the overall weight.

[0011] The beneficial effects of the utility model are:

[0012] 1. Eliminate the gap: Through the action of the spring, the transmission gap between the screw rod and the slider is effectively eliminated, the slider will not lose step, and the overall movement accuracy is improved.

[0013] 2. Improve response speed: The slider always maintains close contact in the direction of screw movement, avoiding delays caused by gaps and improving the response speed of the system.

[0014] 3. Enhanced stability: This structure can provide better stability during the left and right movement of the slider and reduce the jitter or jamming caused by the gap.

[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 Schematic diagram of the linear movement of the existing screw rod and slider; a is a stereoscopic diagram, b is a cross-sectional diagram of the screw rod, c is a state when the screw rod presses against the slider to move it to the right, d is a state before the screw rod changes direction to move the slider to the left, and e is a state when the screw rod contacts the slider to the left;

[0018] Figure 2 This is a three-dimensional diagram of the screw transmission clearance elimination structure of the utility model;

[0019] Figure 3 for Figure 2 Axial cross-sectional view at the middle screw;

[0020] Figure 4 for Figure 2 The front view after the screw rod is removed;

[0021] Figure 5 for Figure 2 AA section view in;

[0022] Figure 6 for Figure 4 Schematic diagram of the back side;

[0023] Figure 7 for Figure 2 A three-dimensional schematic diagram of the slider in FIG.

[0024] Figure 8 for Figure 2 Schematic diagram of the half nut structure;

[0025] Fig. 9 for Figure 3 The enlarged view of the screw rod and half nut structure transmission on the left side of the middle;

[0026] Fig.10 for Figure 3 The enlarged view of the screw and slider transmission on the right side of the middle;

[0027] Figure numerals: 1-slider, 11-internal thread cylinder, 12-slot; 2-screw rod; 3-spring; 40-nut, 41-base, 42-threaded sleeve, 43-chuck, 44-guide column. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] like Figure 2-8As shown, a screw transmission gap elimination structure mentioned in the utility model comprises a slider 1, a screw 2, a spring 3 and a nut 4, wherein the slider 1 is provided with an internal threaded cylinder 11 threadedly connected to the screw 2, a nut 4 threadedly connected to the screw 2 and opposite to the internal threaded cylinder 11 is clamped on the slider 1, and a spring 3 is provided between the nut 4 and the internal threaded cylinder 11, that is, the slider 1 serves as the moving part of the load product, the slider 1 is provided with an internal threaded cylinder 11, which can be threadedly connected to the screw 2, and the screw 2 is the main component for realizing linear motion through rotational motion, the thread of the screw 2 is connected to the internal threaded cylinder 11 of the slider 1, the nut 4 is threadedly connected to the screw 1 and is arranged opposite to the internal threaded cylinder 11, playing a role of collaborative support, the spring 3 is located between the nut 4 and the internal threaded cylinder 11, and provides a compression rebound force, so that the compression rebound force provided by the spring 3 is respectively pressed against the slider 1 on both sides where the nut 4 and the internal threaded cylinder 11 are located.

[0030] In this embodiment, the nut 4 is composed of a base 41, a threaded sleeve 42, a chuck 43, and a guide column 44, wherein the base 41 serves as the supporting part of the entire structure to provide stability; the threaded sleeve 42 is arranged on one side of the base 41 for connecting or adjusting with other components, such as the screw 2; the chuck 43 is installed on the outer wall of the threaded sleeve 42 to play a positioning role; the guide column 44 is arranged on the other side of the base 41 relative to the threaded sleeve 42 to position the spring 3; one end of the spring 3 is sleeved on the guide column 44 and abuts against the base 41 to provide elastic force; and the slider 1 is provided with a slot 12 for clamping the chuck 43 to ensure that the nut 4 does not rotate radially relative to the slider 1.

[0031] In this embodiment, the nut 4 is a plastic molded product, and the threaded sleeve 42 adopts a half-screw sleeve structure, that is, the nut 4 is a half-nut structure. In this way, the combination of the plastic molded nut and the half-screw sleeve structure can simplify the design and manufacturing process of the overall structure.

[0032] The assembly sequence is as follows: one end of the spring 3 is sleeved on the internal threaded cylinder 11 and abuts against the slider 1, while the other end of the spring 3 is sleeved on the guide column 44 of the nut 4 and abuts against the base 41, the spring 3 is compressed, and the clamping head 43 on the nut 4 is clamped on the slot 12 of the slider 1 to complete the installation of the nut 4 and the spring 3 on the slider 1. When assembling with the screw 1, the clamping head 43 on the nut 4 is moved to move the nut 4 a certain distance toward the internal threaded cylinder 11, and then the screw 2 is screwed into the slider 1 on the side where the internal threaded cylinder 11 is located and enters the threaded sleeve 42 of the nut 4 and then passes through the slider 1 horizontally. When the assembly is completed, the clamping head 43 is released.

[0033] Its working principle is: when the screw 2 rotates, the internal threaded cylinder 11 and the nut 4 on the slider 1 work together with the thread of the screw 2 to make the slider 1 produce linear motion, and the existence of the spring 3 can maintain a certain pressure between the slider 1 and the nut 4, thereby eliminating the transmission gap phenomenon between the screw 2 and the slider 1, that is, the compression rebound force of the spring 3 can keep the slider 1 in close contact with the screw 2 during the movement of the screw 2, preventing the slider 1 from being immobile when the screw 2 moves in the reverse direction, and ensuring that the slider 1 can respond to the movement command of the screw 2 immediately. Specifically, Fig. 9 As shown, in the combined structure of the screw rod 2 and the slider 1, when the screw rod 2 is against the nut 4 and the nut 4 drives the slider 1 to move to the left, the force direction of the spring 3 on the nut 4 is to the left, so that there is no transmission gap between the screw rod 2 and the left side of the slider 1. After the slider 1 (load product) reaches the position and needs to move to the right, as shown in FIG. Fig.10 As shown, the force direction of the spring 3 on the side slider 1 where the internal threaded cylinder 11 is located is to the left, so that the screw rod 2 presses against the slider 1 and there is no transmission gap between it and the right side of the slider 1. At this time, the screw rod 2 drives the slider 1 to move directly to the right. In this way, no matter whether the slider moves to the left or right, the slider and the screw rod can always be against each other, and there is no transmission gap between them.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A screw drive clearance elimination structure, comprising a slider (1) and a screw (2), characterized in that: The invention also comprises a spring (3) and a nut (4); the slider (1) is provided with an internally threaded cylinder (11) threadedly connected to the screw rod (2); the slider (1) is clamped with the nut (4) threadedly connected to the screw rod (2) and opposite to the internally threaded cylinder (11); and the spring (3) is provided between the nut (4) and the internally threaded cylinder (11); the spring (3) provides a compressive rebound force to press against the slider (1) on both sides where the nut (4) and the internally threaded cylinder (11) are located.

2. The screw drive clearance elimination structure according to claim 1, characterized in that: The nut (4) is composed of a base (41), a threaded sleeve (42), a clamp (43), and a guide column (44); the threaded sleeve (42) and the guide column (44) are respectively arranged on both sides of the base (41); the clamp (43) is arranged on the outer wall of the threaded sleeve (42); one end of the spring (3) is sleeved on the guide column (44) and abuts against the base (41); and a slot (12) for clamping the clamp (43) is opened on the slider (1).

3. The screw drive clearance elimination structure according to claim 2, characterized in that: The threaded sleeve (42) adopts a half-threaded sleeve structure.

4. The screw drive clearance elimination structure according to any one of claims 1 to 3, characterized in that: The nut is a plastic molded product.

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