U-shaped spring piece and ball screw mounting structure comprising same

Abstract

The utility model discloses a U-shaped spring piece and a ball screw mounting structure comprising the same, the U-shaped spring piece comprises a bent arc, a bent bottom surface and a bent top surface, the bent bottom surface and the bent top surface are positioned at two ends of the bent arc, and the bent bottom surface is provided with a mounting hole for a flange bearing to pass through; the bent arc is formed by stamping and bending a metal sheet, and opened arm parts are respectively formed at two ends of the bent arc; the bending bottom surface is formed by bending a first bending point at one end of the bending arc upwards and connecting the first bending point with the arm part, the bending top surface is formed by bending a second bending point at the other end of the bending arc downwards and connecting the second bending point with the arm part, the bending bottom surface is horizontally arranged, and the bending top surface inclines towards the direction of the bending bottom surface. And an included angle a between the bent top surface and the horizontal plane is 15-20 degrees. According to the utility model, the structure of the U-shaped spring piece is improved, and a built-in extrusion type elastic piece is improved into an external pushing type elastic piece, so that the installation space of the elastic piece is increased, and the toughness is also improved, thereby prolonging the service life of the motor.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a U-shaped spring sheet and a ball screw installation structure comprising the same. Background Art

[0002] In the field of small motors, the axial movement of the motor has a great impact on the overall performance of the motor, which is related to the life, noise and torque of the motor. When the motor moves, it will cause the rotor inside the motor to move up and down, which not only increases the friction of the motor, but also produces abnormal noise. Now generally use corrugated gaskets and spring clips to offset the movement of the motor itself by the elastic force of the spring clip itself, so that the motor is always in a tight fit state without movement.

[0003] The spring clips in the prior art have a relatively large opening angle in a free state, and during processing, it is sufficient to punch out a bending arc in one step. During use, they can only generate elastic force under pressure, and cannot withstand outward expansion force. Therefore, both the corrugated gasket and the spring clip are built-in. However, the corrugated gasket and the spring clip are built-in. First, they will be limited by the internal space of the motor, resulting in the size of the spring clip itself not being too large, which means that the elastic force itself will not be too large. Secondly, due to the size and space limitations of the corrugated gasket and the spring clip, the toughness of the spring clip itself will be reduced during processing and shaping due to its own small size. This will cause the spring clip to undergo plastic deformation after a period of use, and the spring clip will not be able to function, resulting in the motor's uncontrolled movement and increasing the risk of motor failure. Utility Model Content

[0004] In order to solve the problem that the ball screw motor in the prior art adopts a built-in spring sheet to offset the movement of the motor, and the spring sheet is prone to plastic deformation after long-term use due to the small space, resulting in uncontrolled movement of the motor, the utility model provides a U-shaped spring sheet and a ball screw installation structure containing the same to solve the above problem.

[0005] The utility model proposes a U-shaped spring sheet, comprising a bent arc and a bent bottom surface and a bent top surface located at both ends of the bent arc, wherein a mounting hole for a flange bearing to pass through is arranged on the bent bottom surface; the bent arc is formed by stamping and bending a metal sheet and forming open arms at both ends; the bent bottom surface is formed by bending upwards a first bending point at one end of the bent arc to connect with the arm portion, and the bent top surface is formed by bending downwards a second bending point at the other end of the bent arc to connect with the arm portion, the bent bottom surface is arranged horizontally, the bent top surface is inclined toward the direction of the bent bottom surface, and an angle a between the bent top surface and the horizontal plane is 15°~20°.

[0006] Furthermore, a circular ring is provided at one end of the bent bottom surface away from the bent arc, and the mounting hole is located at the center of the circular ring.

[0007] Furthermore, an edge of one end of the bent top surface away from the bent arc is an arc surface, and the center of the arc surface coincides with the center of the mounting hole.

[0008] Furthermore, the bending angle of the bending arc is 90°, a line connecting the first bending point and the second bending point passes through the center of the bending arc, and the bending bottom surface is tangent to the bending arc.

[0009] The utility model also proposes a ball screw mounting structure, comprising a mounting plate, a screw, a flange bearing and the U-shaped spring sheet described above; the mounting plate is provided with a through hole, the bent bottom surface and the bent top surface of the U-shaped spring sheet are respectively located on both sides of the mounting plate, the flange bearing passes through the mounting hole and the through hole and is assembled with the mounting plate, and the screw passes through the flange bearing and abuts against the bent top surface.

[0010] Furthermore, the flange bearing includes a connecting bearing and a limiting flange, the connecting bearing is installed in the mounting hole and the through hole, and the bent bottom surface is pressed between the limiting flange and the mounting plate.

[0011] Furthermore, the end surface of the screw rod abutting against the bent top surface is a spherical surface.

[0012] Furthermore, the mounting plate is located on a mounting bracket, the mounting bracket is fixed to the housing of the motor, and has an intermediate connecting plate connected to the mounting plate.

[0013] Furthermore, a notch is provided at the connection between the mounting plate and the middle connecting plate, and the U-shaped spring sheet is inserted from the notch toward the mounting plate, so that the bent arc is located at the notch.

[0014] Furthermore, the diameter of the mounting hole is larger than the outer diameter of the connecting bearing, and the through hole and the connecting bearing are interference fit.

[0015] The beneficial effects of the utility model are:

[0016] (1) The utility model adds two bending steps on the basis of the traditional spring sheet structure, so that the opening angle of the U-shaped spring sheet is reduced, so that it can withstand a larger outward expansion pressure. The built-in extrusion spring sheet can be improved into an external push-type spring sheet, the spring sheet installation space is increased, and the toughness is also improved, thereby increasing the service life of the motor.

[0017] (2) The utility model adopts the spherical surface design of the screw end, and the U-shaped spring sheet is in point contact with the metal screw, which can better reduce the noise during operation.

[0018] (3) The utility model can be applied to the field of servo motor drive and control integrated system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of a traditional spring sheet after stamping and bending;

[0021] Figure 2 It is a schematic diagram of the U-shaped spring piece described in the utility model in a free state;

[0022] Figure 3 yes Figure 2 A top view of

[0023] Figure 4 It is a schematic diagram of the screw in the ball screw installation structure of the utility model;

[0024] Figure 5 It is an exploded view of the flange bearing connection in the ball screw installation structure of the utility model;

[0025] Figure 6 It is a schematic diagram of the assembly of the flange bearing and the U-shaped spring sheet in the utility model;

[0026] Figure 7 It is an axial cross-sectional view of the ball screw installation structure of the utility model.

[0027] In the figure, 1, U-shaped spring sheet, 2, bending arc, 3, bending bottom surface, 301, ring, 4, bending top surface, 401, arc surface, 5, flange bearing, 501, connecting bearing, 502, limiting flange, 6, mounting hole, 7, arm, 8, first bending point, 9, second bending point, 10, screw, 1001, spherical surface, 11, mounting bracket, 1101, mounting plate, 1102, middle connecting plate, 12, through hole, 13, motor, 14, notch. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Embodiment 1

[0030] like Figure 2-Figure 5As shown, a U-shaped spring sheet comprises a bent arc 2 and a bent bottom surface 3 and a bent top surface 4 located at both ends of the bent arc 2, the bent bottom surface 3 is provided with a mounting hole 6 for a flange bearing 5 to pass through; the bent arc 2 is formed by stamping and bending a metal sheet and has open arms 7 formed at both ends; the bent bottom surface 3 is formed by a first bending point 8 at one end of the bent arc 2 being bent upward to connect with the arm 7, the bent top surface 4 is formed by a second bending point 9 at the other end of the bent arc 2 being bent downward to connect with the arm 7, the bent bottom surface 3 is arranged horizontally, the bent top surface 4 is inclined toward the bent bottom surface 3, and the angle a between the bent top surface 4 and the horizontal plane is 15°~20°.

[0031] The U-shaped spring sheet 1 of the utility model is completed by bending a metal sheet with a mounting hole 6 through three processes. The first process is to form a bending arc 2 by conventional stamping and bending. At this time, the two ends of the bending arc 2 are arm portions 7 (such as Figure 1 As shown in the figure, the arc surface 401 bending is compared with the right-angle bending, so that the cold stress after stamping can be evenly distributed on the arc surface 401, and the stress will not be concentrated, reducing the risk of fracture. In addition, in order to avoid the metal sheet from breaking, the stamping bending angle will not be too large, and the maximum bending angle is 90°. Since the metal sheet has a certain reset force, after the bending is completed, the arms 7 on both sides will open outward, so the outward thrust that can be withstood is small. If the screw 10 pushes one of the arms 7 outward, the screw 10 will push open the arm 7, and thus the clamping effect cannot be achieved. For this reason, the utility model needs to bend twice more, bending the two arms 7 inwards respectively (as shown in the figure). Figure 2 As shown in the figure, the arm 7 at the bottom is bent upward to a horizontal position to form a bent bottom surface 3, which is used as a fixing surface when the motor 13 is assembled and fits with the mounting plate 1101. The arm 7 at the top is bent downward to form a bent top surface 4, and the bent top surface 4 is tilted downward. The bent top surface 4 needs to withstand an outward thrust when the motor 13 is assembled. Bending it downward can reduce the opening angle of the U-shaped spring sheet 1, thereby improving the toughness of the bent top surface 4 and increasing its service life. Figure 7 As shown, after the motor 13 is assembled, the end of the screw rod 10 presses against the bent top surface 4, and the bent top surface 4 is approximately parallel to the bent bottom surface 3, thereby axially pressing the screw rod 10.

[0032] If the bending top surface 4 is tilted downward at an angle that is too large, it will collide with the bending bottom surface 3. If the tilt angle is too small, the toughness will be reduced. Preferably, the angle a between the bending top surface 4 and the horizontal plane is 15°~20°.

[0033] In order to facilitate the center positioning of the bending bottom surface 3 and the flange bearing 5, a ring 301 is preferably provided at the end of the bending bottom surface 3 away from the bending arc 2, and the mounting hole 6 is located at the center of the ring 301 (such as Figure 3 and Figure 5When assembling the U-shaped spring piece 1, the center point needs to be pressed to be aligned with the center of the screw rod 10 as much as possible. Therefore, the installation position of the U-shaped spring piece 1 is limited. Since the size of the mounting hole 6 is large and the mounting hole 6 is blocked by the flange bearing 5, it is not convenient to observe. The design of the ring 301 can expose its outer cylindrical surface, that is, the outer diameter of the ring 301 is larger than the outer diameter of the flange bearing 5. Whether it is aligned with the flange bearing 5 is determined based on the outer cylindrical surface of the ring 301.

[0034] In a preferred embodiment, the edge of one end of the bent top surface 4 away from the bent arc 2 is an arc surface 401, and the center of the arc surface 401 coincides with the center of the mounting hole 6, so that the elastic force direction of the entire U-shaped spring sheet 1 coincides with the central axis of the motor 13, so that the axial force generated by the motor 13 just offsets the elastic force of the U-shaped spring sheet 1, and there will be no uneven force, radial displacement, and increased noise and wear of the motor 13.

[0035] In further design, the bending angle of the bending arc 2 is 90°, at which time the toughness and life reach the maximum requirements. The line connecting the first bending point 8 and the second bending point 9 passes through the center of the bending arc 2, and the bending bottom surface 3 is tangent to the bending arc 2. This can minimize the edges and corners of the U-shaped spring sheet 1 at the bending point, avoid stress concentration and cause fracture, and increase the service life.

[0036] Embodiment 2

[0037] A ball screw installation structure, such as Figure 5-Figure 7 As shown, it includes a mounting plate 1101, a screw 10, a flange bearing 5 and the U-shaped spring piece 1 described above; the mounting plate 1101 is provided with a through hole 12, the bent bottom surface 3 and the bent top surface 4 of the U-shaped spring piece 1 are respectively located on both sides of the mounting plate 1101, the flange bearing 5 passes through the mounting hole 6 and the through hole 12 to be assembled with the mounting plate 1101, and the screw 10 passes through the flange bearing 5 and abuts against the bent top surface 4. Compared with the traditional structure, the utility model sets the U-shaped spring piece 1 on the outside, fixes the bent bottom surface 3 by using the mounting plate 1101, and the screw 10 passes through the bent bottom surface 3 to push the bent top surface 4. The elastic force of the bent top surface 4 presses the screw 10 axially, and the other end of the screw 10 built into the motor 13 only needs to cooperate with the bearing, and no spring sheet is needed. Therefore, the size of the U-shaped spring piece 1 can be increased, the toughness and service life of the U-shaped spring piece 1 are better, and the installation is more convenient.

[0038] The flange bearing 5 refers to a bearing with a flange, which mainly includes a connecting bearing 501 and a limiting flange 502. The connecting bearing 501 is installed in the mounting hole 6 and the through hole 12, and the bent bottom surface 3 is pressed between the limiting flange 502 and the mounting plate 1101. The connecting bearing 501 is a connecting piece between the screw 10 and the mounting plate 1101, so that the screw 10 can rotate relative to the through hole 12. The limiting flange 502 axially limits the flange bearing 5. The limiting flange 502, the bent bottom surface 3 and the bottom surface of the mounting plate 1101 can be fixed by glue. The diameter of the mounting hole 6 is larger than the outer diameter of the connecting bearing 501, so that the connecting bearing 501 can pass through. The through hole 12 and the connecting bearing 501 are interference fit, and the connecting bearing 501 can be fixed. The horizontally set bending bottom surface 3 can ensure a good fit with the limiting flange 502 and the mounting plate 1101. In the free state, the bending top surface 4 is inclined downward. After the upper end of the screw 10 pushes the bending top surface 4, the bending top surface 4 can generate a downward restoring force.

[0039] In order to reduce the contact area between the screw 10 and the bent top surface 4 and reduce the collision noise, the end surface of the screw 10 abutting against the bent top surface 4 is preferably a spherical surface 1001. Figure 4 and Figure 7 As shown, the portion of the upper end of the screw rod 10 that passes through the flange bearing 5 is not provided with threads and has a smaller diameter, and the spherical surface 1001 is located at the end of the small diameter.

[0040] The mounting plate 1101 is integrally arranged on the mounting bracket 11, and the mounting bracket 11 is fixed to the housing of the motor 13 and has an intermediate connecting plate 1102 connected to the mounting plate 1101. Figure 5 As shown, the mounting bracket 11 is used to fix the motor 13 (fixed at the lower end) and to install the U-shaped spring piece 1 (installed at the upper end). The U-shaped spring piece 1 can be inserted from the outside of the mounting plate 1101, but this will occupy extra space, and the U-shaped spring piece 1 is easily deformed by collision. For this reason, in a preferred embodiment, a notch 14 is provided at the connection between the mounting plate 1101 and the intermediate connecting plate 1102, and the U-shaped spring piece 1 is inserted into the mounting plate 1101 from the notch 14, so that the bent arc 2 is located at the notch 14. At this time, the U-shaped spring piece 1 is installed into the mounting plate 1101 from the side where the intermediate connecting plate 1102 is located. After the installation is completed, the bent arc 2 can be hidden in the notch 14, which will not occupy extra space and can also protect the U-shaped spring piece 1, and will not cause the U-shaped spring piece 1 to fail due to collision displacement.

[0041] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0043] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0044] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A U-shaped spring sheet, characterized in that: It comprises a bending arc and a bending bottom surface and a bending top surface located at two ends of the bending arc, and a mounting hole for the flange bearing to pass through is provided on the bending bottom surface; The bending arc is formed by stamping and bending a metal sheet and forms open arms at both ends; the bending bottom surface is formed by bending upward at a first bending point at one end of the bending arc to connect with the arm, and the bending top surface is formed by bending downward at a second bending point at the other end of the bending arc to connect with the arm, the bending bottom surface is arranged horizontally, the bending top surface is inclined toward the bending bottom surface, and the angle a between the bending top surface and the horizontal plane is 15°~20°.

2. The U-shaped spring sheet according to claim 1, characterized in that: A circular ring is provided at one end of the bent bottom surface away from the bent arc, and the mounting hole is located at the center of the circular ring.

3. The U-shaped spring sheet according to claim 2, characterized in that: The edge of one end of the bent top surface away from the bent arc is an arc surface, and the center of the arc surface coincides with the center of the mounting hole.

4. The U-shaped spring sheet according to claim 1, characterized in that: The bending angle of the bending arc is 90°, a line connecting the first bending point and the second bending point passes through the center of the bending arc, and the bending bottom surface is tangent to the bending arc.

5. A ball screw installation structure, characterized in that: It includes a mounting plate, a screw, a flange bearing and a U-shaped spring sheet as described in any one of claims 1 to 4; the mounting plate is provided with a through hole, the bent bottom surface and the bent top surface of the U-shaped spring sheet are respectively located on both sides of the mounting plate, the flange bearing passes through the mounting hole and the through hole and is assembled with the mounting plate, and the screw passes through the flange bearing and abuts against the bent top surface.

6. The ball screw mounting structure according to claim 5, characterized in that: The flange bearing comprises a connecting bearing and a limiting flange, the connecting bearing is installed in the mounting hole and the through hole, and the bent bottom surface is pressed between the limiting flange and the mounting plate.

7. The ball screw mounting structure according to claim 5, characterized in that: The end surface of the screw rod abutting against the bent top surface is a spherical surface.

8. The ball screw mounting structure according to claim 5, characterized in that: The mounting plate is located on a mounting bracket, the mounting bracket is fixed to the housing of the motor and has an intermediate connecting plate connected to the mounting plate.

9. The ball screw mounting structure according to claim 8, characterized in that: A notch is provided at the connection between the mounting plate and the middle connecting plate, and the U-shaped spring sheet is inserted from the notch toward the mounting plate, so that the bent arc is located at the notch.

10. The ball screw mounting structure according to claim 6, characterized in that: The diameter of the mounting hole is larger than the outer diameter of the connecting bearing, and the through hole is interference fit with the connecting bearing.

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