Lead screw transmission sliding rail mechanism

Abstract

The utility model discloses a lead screw transmission sliding rail mechanism which comprises an upper rail assembly, a lower rail body, a wiring harness assembly and a motor, the upper rail assembly and the lower rail body are matched through a ball bearing to slide mutually, the motor is connected with a flexible shaft, the flexible shaft is connected with a lead screw base assembly, the lead screw base assembly comprises a bearing base, a bearing, a lead screw and a lead screw nut, the bearing is arranged in the bearing base, and the lead screw nut is arranged in the bearing base. The tail end of the lead screw is installed in the floating bearing base. The lead screw is installed in the floating bearing base, and the effect of absorbing radial shaking of the tail end of the lead screw during high-speed rotation is achieved. The motor is installed on the motor support, and rubber sleeves are arranged at the two ends of the motor support, so that the effects of cushioning and noise reduction are achieved. And a plastic gasket is further arranged below the bearing base, so that the vibration isolation effect is achieved between the lead screw base and the lower rail.

Description

Technical Field

[0001] The utility model relates to a screw rod transmission mechanism. Background Art

[0002] Screw drive is a very common transmission method, with the characteristics of high transmission efficiency and high precision, and is widely used in the automotive parts industry. However, general screw drives have disadvantages such as jitter and high noise, which seriously affect the use effect. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a screw drive slide rail mechanism.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a screw transmission slide rail mechanism, including an upper rail assembly, a lower rail body, a wiring harness assembly, and a motor. The upper rail assembly and the lower rail body slide with each other in cooperation with ball bearings. The motor is connected to a flexible shaft, and the flexible shaft is connected to a screw base assembly. The screw base assembly includes a bearing base, a bearing, a screw, and a screw nut. The bearing is arranged in the bearing base, and the end of the screw is installed in the floating bearing base.

[0005] The motor is mounted on a motor bracket, and rubber sleeves are arranged at both ends of the motor bracket.

[0006] A plastic gasket is also provided under the bearing base.

[0007] The harness assembly is provided with a travel switch for controlling the travel of the upper rail assembly, and the lower rail body is provided with a travel baffle.

[0008] A shielding strip is arranged on the lower rail body.

[0009] Four symmetrically distributed elastic ribs are arranged inside the floating bearing buckle.

[0010] The elastic ribs are in a diamond-shaped structure.

[0011] The utility model has the function of absorbing the radial vibration of the end of the screw rod when it rotates at high speed by installing the screw rod in the floating bearing base. The motor is installed on the motor bracket, and rubber sleeves are provided at both ends of the motor bracket to play the role of shock absorption and noise reduction. A plastic gasket is also provided under the bearing base to provide vibration isolation between the screw rod base and the lower rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a schematic diagram of an exploded view of the utility model;

[0014] Figure 3 This is a schematic diagram of the screw base assembly structure of the utility model;

[0015] Figure 4 It is an exploded schematic diagram of the screw base assembly of the utility model;

[0016] Figure 5 The structure of the floating bearing buckle of the utility model is shown in FIG. Figure 1 ;

[0017] Figure 6 The structure of the floating bearing buckle of the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Reference Figure 1-4 The utility model provides an embodiment: a screw drive slide rail mechanism, including an upper rail assembly 2, a lower rail body 3, a harness assembly 4, and a motor 10. The upper rail assembly 2 and the lower rail body 3 slide with each other by ball bearings. The motor 10 is connected to a flexible shaft 11, and the flexible shaft 11 is connected to a screw base assembly 1. The screw base assembly 1 includes a bearing base 22, a bearing 18, a screw 24, and a screw nut 25. The bearing 18 is arranged in the bearing base 22, and the end of the screw 24 is installed in the floating bearing base 15. The motor 10 can be a DC motor.

[0020] The motor 10 is mounted on the motor bracket 8, and rubber sleeves 13 are provided at both ends of the motor bracket 8. A plastic gasket 12 is also provided under the bottom 22 of the bearing base. A travel switch 16 for controlling the travel of the upper rail assembly 2 is provided on the harness assembly 4, and a travel stopper 5 is provided on the lower rail body 3. When the upper rail assembly 2 moves forward and backward, the two travel switches 16 hit the travel stopper 5 respectively, and the limit position of the forward and backward sliding is recognized.

[0021] The end of the screw rod 24 is mounted in the floating bearing base 15 through the floating bearing buckle 14. Figure 5 , Figure 6 Four symmetrically distributed elastic ribs 28 are arranged inside the floating bearing buckle 14. The elastic ribs 28 are in a diamond-shaped structure.

[0022] The floating bearing buckle 14 is composed of four rhombus-shaped elastic ribs in the middle. These four rhombus-shaped ribs will produce a certain elastic deformation when subjected to force, thereby reducing the shaft runout caused by the coaxiality tolerance when the screw rotates, making the screw rotation more stable and efficient.

[0023] Simultaneous verification shows that when the floating bearing bracket buckle is not used and the fixed bearing buckle is used to fix the screw head instead of the floating bearing buckle, the coaxiality deviation will easily cause the screw to get stuck during rotation, and the jitter noise will be more obvious. It is concluded that the floating bearing structure has better tolerance performance and can solve the jitter and noise problems of general screw rotation.

[0024] The end cover plate 6 is sleeved on the lower rail body 3 , the wire harness sleeve 7 is used to protect the wire harness, and the motor controller 9 is used to control the motor 10 .

[0025] The screw rod 24 is connected to the flexible shaft 11 through the coupling 21, the bearing 18 is arranged in the bearing base 22 through the retaining spring 19, and the bearing end cover 23 is arranged on the bearing base 22. A shielding strip 30 is arranged on the lower rail body 3.

[0026] The screw nut 25 is arranged on the nut bracket 20 , and nut rubber sleeves 17 are arranged on both sides of the screw nut 25 . The nut bracket 20 can be used to fix the sliding object.

[0027] The motor 10 drives the screw rod 24 through the flexible shaft 11 , the screw rod 24 drives the screw rod nut 25 , and the screw rod nut 25 drives the upper rail assembly 2 arranged thereon to slide on the lower rail body 3 .

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw drive slide rail mechanism, characterized in that: The invention comprises an upper rail assembly (2), a lower rail body (3), a wiring harness assembly (4), and a motor (10). The upper rail assembly (2) and the lower rail body (3) slide with each other by means of ball bearings. The motor (10) is connected to a flexible shaft (11), and the flexible shaft (11) is connected to a screw base assembly (1). The screw base assembly (1) comprises a bearing base (22), a bearing (18), a screw (24), and a screw nut (25). The bearing (18) is arranged in the bearing base (22), and the end of the screw (24) is installed in the floating bearing base (15).

2. A screw drive slide rail mechanism according to claim 1, characterized in that: The motor (10) is mounted on a motor bracket (8), and rubber sleeves (13) are provided at both ends of the motor bracket (8).

3. A screw drive slide rail mechanism according to claim 1, characterized in that: A plastic gasket (12) is also provided under the bearing base (22).

4. The screw drive slide rail mechanism according to claim 1, characterized in that: The harness assembly (4) is provided with a travel switch (16) for controlling the travel of the upper rail assembly (2), and the lower rail body (3) is provided with a travel baffle (5).

5. The screw drive slide rail mechanism according to claim 1, characterized in that: The end of the screw rod (24) is mounted inside the floating bearing base (15) via a floating bearing buckle (14).

6. The screw drive slide rail mechanism according to claim 1, characterized in that: The screw nut (25) is arranged on the nut bracket (20), and nut rubber sleeves (17) are arranged on both sides of the screw nut (25).

7. The screw drive slide rail mechanism according to claim 1, characterized in that: A shielding strip (30) is provided on the lower rail body (3).

8. The screw drive slide rail mechanism according to claim 5, characterized in that: Four symmetrically distributed elastic ribs (28) are arranged inside the floating bearing buckle (14).

9. A screw drive slide rail mechanism according to claim 8, characterized in that: The elastic ribs (28) are in a diamond-shaped structure.

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