Ball screw mounting structure and head-up display motor comprising same

Abstract

The utility model discloses a ball screw mounting structure and a head-up display motor comprising the same, the ball screw mounting structure comprises a U-shaped spring piece, a connecting bearing and a screw assembly which are sequentially connected in the axial direction, the connecting bearing is mounted on one side of the U-shaped spring piece, the U-shaped spring piece abuts against a support of the head-up display motor, and the screw assembly is mounted on one side of the U-shaped spring piece. The screw rod assembly comprises a screw rod and an adapting part located at one end of the screw rod, and the adapting part enables the connecting bearing to be in running fit with the screw rod through an arc surface in contact fit with the connecting bearing. According to the utility model, the assembly technology is simple, the requirement on the environment is low, the strict assembly technology of installing a deep groove ball bearing is not needed, the abnormal noise phenomenon caused by the damage of the deep groove ball bearing is avoided, and the abutting connection of the U-shaped spring piece and the connecting bearing can avoid the noise caused by the axial movement of the motor shaft.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a ball screw installation structure and a head-up display motor comprising the same. Background Art

[0002] In the industrial and automotive fields, deep groove ball bearings and rolling bearings are rotating parts that can withstand radial and axial loads. They have the advantages of high precision, low friction, low noise, low temperature resistance, high-speed stability, and reliable life. They are widely used in the motor industry to ensure the stability and life of the motor when it rotates at high speed. However, since the deep groove ball itself is a mechanical structure that is easy to damage and has disadvantages such as high cost, it is difficult to use it on a large scale in low-speed and low-cost motors. Rolling bearings with oil content have the problem of grease volatilization due to the characteristics of the parts themselves, and the noise increases after the grease evaporates. They are also unable to adapt to the increasingly high requirements of motors.

[0003] In addition, the existing technology connects the outer bracket of the bearing to the motor bracket, and there is no axial movement margin at the connection between the bearing and the screw. When the screw and the motor shaft move axially, impact noise is easily generated, especially the noise generated by traditional metal bearings is greater. Therefore, it is necessary to design a motor structure that can reduce noise, reduce friction and increase life. Utility Model Content

[0004] In order to solve the technical problems of high processing cost of the screw connection structure and large noise caused by axial movement of the screw in the prior art head-up display motor, the utility model provides a ball screw installation structure and a head-up display motor including the same to solve the above problems.

[0005] The utility model proposes a ball screw installation structure, comprising a U-shaped spring sheet, a connecting bearing and a screw assembly which are axially connected in sequence, the connecting bearing is installed on one side of the U-shaped spring sheet, the U-shaped spring sheet is abutted against a bracket of a head-up display motor, the screw assembly comprises a screw rod and a transition part located at one end of the screw rod, the transition part enables the connecting bearing to rotate and cooperate with the screw rod through an arc surface which contacts and cooperates with the connecting bearing.

[0006] Furthermore, the screw rod is made of metal material, and the connecting bearing is made of plastic material.

[0007] Furthermore, the end of the connecting bearing has a slot for inserting the screw, and the inner bottom surface of the slot has a first groove that matches the arc surface of the adapter.

[0008] Furthermore, the transition part is provided with a ball separately from the screw rod, and the ball rod abuts between the screw rod and the connecting bearing.

[0009] Furthermore, the transition portion is a spherical structure fixed to the end of the screw.

[0010] Furthermore, the end of the screw has a second groove that contacts and cooperates with the ball.

[0011] Furthermore, the first groove and the second groove are V-shaped grooves.

[0012] Furthermore, the hardness of the transition part is greater than the hardness of the screw rod, and the transition part is made of wear-resistant material.

[0013] Furthermore, the U-shaped spring sheet includes a first stop arm and a second stop arm, the connecting bearing includes an abutment portion and a limiting portion, the diameter of the abutment portion is smaller than the diameter of the limiting portion, the abutment portion passes through the second stop arm and abuts against the first stop arm, and the limiting portion is located on the outside of the second stop arm.

[0014] Furthermore, the end surface of the abutting portion contacting the first barrier arm is an arc-shaped surface.

[0015] Furthermore, the ends of the first barrier arm and the second barrier arm are both arc-shaped panels, and the center lines of the two arc-shaped panels coincide.

[0016] Furthermore, the arc-shaped panels at the ends of the first barrier arm and the second barrier arm coincide with the center line of the connecting bearing.

[0017] The utility model also provides a head-up display motor, comprising the above-mentioned ball screw installation structure.

[0018] The beneficial effects of the utility model are:

[0019] (1) The utility model has a simple assembly process and low environmental requirements. It does not require strict assembly process for deep groove ball bearings and does not cause abnormal noise due to damage to deep groove ball bearings. At the same time, the abutment between the U-shaped spring sheet and the connecting bearing can prevent the motor shaft from axial movement and generating noise.

[0020] (2) The utility model makes the U-shaped spring sheet contact with the connecting bearing through the unique structural design of the U-shaped spring sheet and the connecting bearing. Compared with the screw in which the U-shaped spring sheet directly contacts the metal, the noise during operation can be better reduced.

[0021] (3) The utility model ensures that the axial force direction of the motor is at the center of the motor through the concentric design of the U-shaped spring sheet and the connecting bearing.

[0022] (4) The patented technology of this utility model can be applied to the field of servo motor drive and control integrated system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1It is an exploded view of a specific implementation of the head-up display motor described in the utility model;

[0025] Figure 2 It is a schematic diagram of the connecting bearing in the ball screw installation structure described in the utility model;

[0026] Figure 3 It is a schematic diagram of the assembly of the screw and the ball in the utility model;

[0027] Figure 4 This is a schematic diagram of the screw, ball bearing and connecting bearing after assembly in the utility model;

[0028] Figure 5 It is a schematic diagram of the assembly of the U-shaped spring sheet and the connecting bearing in the utility model;

[0029] Figure 6 It is a schematic diagram of the ball screw installation structure described in the utility model.

[0030] In the figure, 1. U-shaped spring sheet, 101. first stop arm, 102. second stop arm, 2. connecting bearing, 201. slot, 202. first groove, 203. abutment portion, 204. limiting portion, 3. screw, 301. second groove, 4. ball bearing, 401. arc surface, 5. bracket, 6. arc surface, 7. stator assembly, 8. rotor assembly, 9. slider, 10. nut, 11. guide shaft. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1As shown, a ball screw installation structure includes a U-shaped spring sheet 1, a connecting bearing 2 and a screw assembly that are axially connected in sequence. The connecting bearing 2 is installed on one side of the U-shaped spring sheet 1. The U-shaped spring sheet 1 abuts against the bracket 5 of the head-up display motor. The elastic force of the U-shaped spring sheet 1 can provide an axial preload for the screw assembly. When the motor shaft moves axially, the screw assembly, the connecting bearing 2 and the U-shaped spring sheet 1 always abut against each other in sequence, and no end face collision occurs, thereby avoiding the generation of impact noise. The screw assembly includes a screw 3 and a transition portion located at one end of the screw 3. The transition portion enables the connecting bearing 2 to rotate with the screw 3 through an arc surface 401 that contacts and cooperates with the connecting bearing 2. The connecting bearing 2 in the utility model is not a bearing in the traditional sense, but a connecting structure between the U-shaped spring sheet 1 and the screw 3. There is no rolling steel ball inside the connecting bearing 2, but the screw 3 and the connecting bearing 2 can rotate relative to each other through the contact and cooperation between the transition portion and the connecting bearing 2. This replaces the traditional deep groove ball and oil-containing bearing fixed connection method, simplifies the assembly process, and at the same time, the surface of the adapter can be coated with grease, and the self-lubricating effect of the grease can greatly reduce noise.

[0033] The screw 3 is made of conventional metal material, and the connecting bearing 2 is preferably made of plastic material, which can be injection molded. The material selection is preferably made of wear-resistant and lubricating materials. Due to its high temperature resistance, wear resistance and self-lubrication, it can effectively reduce the friction sound of rotation when the motor rotates.

[0034] Similarly, a ball 4 and a connecting bearing 2 may also be provided at the end of the screw 3 away from the U-shaped spring sheet 1, and the U-shaped spring sheet 1 only needs to be provided at one end. Figure 3 and Figure 4 This is the assembly diagram of this end.

[0035] Assembly of connecting bearing 2 and the screw assembly:

[0036] like Figure 2 , Figure 4 and Figure 6 As shown, the end of the connecting bearing 2 has a slot 201 for inserting the screw 3, and the inner bottom surface of the slot 201 has a first groove 202 that matches the arc surface 401 of the adapter. The slot 201 pre-positions the screw 3 and also prevents the adapter from being separated from the first groove 202. Figure 4 and Figure 6 As shown, the diameter of the slot 201 is slightly larger than the diameter of the screw rod 3, and the two are mutually sleeved to achieve radial positioning without affecting the relative rotation of the two.

[0037] Screw assembly:

[0038] The screw assembly can be an integrated structure, in which case the adapter can be a spherical structure fixed to the end of the screw 3. The spherical structure can be made separately from the screw 3 and then fixed to the end of the screw 3, or it can be integrally formed with the screw 3, that is, one end of the screw 3 is designed as a spherical end face.

[0039] The screw assembly can also be a split structure. In this case, the adapter is a separate body from the screw 3, and the ball 4 is in contact between the screw 3 and the connecting bearing 2. After the structure is matched with the connecting bearing 2, the relative fixation of the screw 3 and the ball 4 can also be achieved. The specific principle is: when the motor rotates, due to this structural design, when the motor actually rotates, due to the different friction coefficients of the materials, the friction coefficient of the metal is greater than the friction coefficient of the plastic. In this way, a phenomenon will occur. Since the screw 3 is made of metal material, the friction force generated when it rotates with the ball 4 is greater than the friction force generated when the ball 4 and the connecting bearing 2 rotate. There will be no relative rotation between the screw 3 and the ball 4, forming an integrated structure, and then the ball 4 rotates and rubs in the first groove 202 of the connecting bearing 2, and rotates with the motor shaft.

[0040] The design using the ball 4 is more flexible in material selection. The utility model preferably has a hardness of the adapter greater than that of the screw 3, and the adapter is made of a wear-resistant material. Due to the need to process the thread, it is impossible to use a material with a very high hardness for the screw 3, but low hardness will lead to reduced wear resistance, which can be compensated by the adapter. The adapter uses a different material from the screw 3, and uses a high-hardness wear-resistant material. This can greatly improve the wear-resistant life requirements.

[0041] To prevent the ball 4 from falling off during assembly, the end of the screw 3 has a second groove 301 that contacts and cooperates with the ball 4. During installation, first, a layer of grease is applied to the surface of the ball 4, and then the ball 4 is placed in the second groove 301 of the screw 3. Due to the adsorption of the grease, the ball 4 will be adhered to the second groove 301. Figure 3 Next, take the assembled rotor assembly 8 and ball 4, and then put them into the first groove 202 connected to the bearing 2. Grease should be applied to the first groove 202, as shown in FIG. Figure 4 As shown. The assembly of this structure is now complete.

[0042] The first groove 202 and the second groove 301 are preferably V-shaped grooves. Since the screw 3 and the connecting bearing 2 both adopt a V-shaped groove structure and a certain matching clearance is reserved, the ball 4 can move freely in the groove and can perform a certain radial displacement. When the axial force is offset, the connecting bearing 2, the ball 4, and the screw 3 will be offset together. Finally, the axial force direction of the entire motor is still in the center of the motor, which can play a similar self-aligning role and ensure that the motor will not be stuck due to the axial preload force offset when rotating.

[0043] Connection between U-shaped spring piece 1 and connecting bearing 2:

[0044] The U-shaped spring sheet 1 includes a first stop arm 101 and a second stop arm 102, and the connecting bearing 2 includes an abutment portion 203 and a limit portion 204. The diameter of the abutment portion 203 is smaller than the diameter of the limit portion 204. The abutment portion 203 passes through the second stop arm 102 and abuts against the first stop arm 101. The limit portion 204 is located on the outside of the second stop arm 102. Figure 5 As shown, the two sides of the U-shaped spring sheet 1 (the first stop arm 101 and the second stop arm 102) are respectively on different sides of the bracket 5, one side is sleeved outside the connecting bearing 2, and the other side abuts against the connecting bearing 2. Since the connecting bearing 2 and the bracket 5 are not tightly matched, they can move in the horizontal direction. When the screw rod 3 jumps in the horizontal direction, it is limited by the elastic force of the U-shaped spring sheet 1. The limiting part 204 can limit the movement of the connecting bearing 2, and the abutment of the second stop arm 102 and the limiting part 204 prevents the first stop arm 101 from being stretched and deformed, resulting in connection failure. In addition, since the connecting bearing 2 abuts against the U-shaped spring sheet 1, compared with the direct contact between the screw rod 3 and the U-shaped spring sheet 1, the noise during operation can be better reduced.

[0045] In a preferred embodiment, Figure 2 and Figure 6 As shown, the end surface of the abutment portion 203 in contact with the first stop arm 101 is an arc-shaped surface 6. The first stop arm 101 of the U-shaped spring piece 1 is made in a flat manner and needs to be made to a certain roughness requirement, so that the force applied by the U-shaped spring piece 1 will present a point contact form, which is conducive to controlling the direction of the force and ensuring the stability of the axial force direction.

[0046] In a further design, the ends of the first barrier arm 101 and the second barrier arm 102 are both arc panels, and the center lines of the two arc panels coincide. This ensures that the elastic force applied by the U-shaped spring sheet 1 is on the central axis of the center of the outer circle of the U-shaped spring sheet 1 (see Figure 6), and the U-shaped spring sheet 1 acts on the connecting bearing 2 in the form of point contact. On this basis, the arc panels at the ends of the first barrier arm 101 and the second barrier arm 102 coincide with the center line of the connecting bearing 2. During assembly, the U-shaped spring sheet 1 is the first barrier arm 101 pressing the connecting bearing 2, and the center lines of the first barrier arm 101 and the second barrier arm 102 coincide with the center line of the connecting bearing 2 (see Figure 5), thereby ensuring that the axial force direction of the entire motor is at the center of the motor.

[0047] The utility model also provides a head-up display motor, such as Figure 1As shown, it includes a motor assembly, a bracket 5, a slider 9, a nut 10, a guide shaft 11 and the above-mentioned ball screw installation structure. The motor assembly includes a stator assembly 7 and a rotor assembly 8. The rotor assembly 8 converts the rotational motion of the stepper motor into the linear motion of the screw 3. The slider 9 and the nut 10 cooperate with the screw 3 thread to realize the torque conversion. The U-shaped spring sheet 1 provides axial preload to the motor, and the connecting bearing 2 supports the rotation of the rotor assembly 8. The bracket 5 and the guide shaft 11 are the places to support the slider 9 to move up and down. The U-shaped spring sheet 1 is installed at the end of the bracket 5.

[0048] In the description of the present invention, it is necessary to understand that the terms "inner", "outer", "axial", "radial", 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.

[0049] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0050] 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.

[0051] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing 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 ball screw installation structure, characterized in that: It includes a U-shaped spring sheet, a connecting bearing and a screw assembly which are connected in sequence axially. The connecting bearing is installed on one side of the U-shaped spring sheet. The U-shaped spring sheet is connected to the bracket of the head-up display motor. The screw assembly includes a screw and a transition part located at one end of the screw. The transition part enables the connecting bearing to rotate with the screw through an arc surface that contacts and cooperates with the connecting bearing.

2. The ball screw mounting structure according to claim 1, characterized in that: The screw rod is made of metal material, and the connecting bearing is made of plastic material.

3. The ball screw mounting structure according to claim 1, characterized in that: The end of the connecting bearing is provided with a slot for inserting the screw rod, and the inner bottom surface of the slot is provided with a first groove matched with the arc surface of the adapter.

4. The ball screw mounting structure according to claim 3, characterized in that: The transition part is provided with a ball separately from the screw rod, and the ball rod abuts between the screw rod and the connecting bearing.

5. The ball screw mounting structure according to claim 3, characterized in that: The transition part is a spherical structure fixed on the end of the screw rod.

6. The ball screw mounting structure according to claim 4, characterized in that: The end of the screw rod has a second groove for contacting and cooperating with the ball.

7. The ball screw mounting structure according to claim 6, characterized in that: The first groove and the second groove are V-shaped grooves.

8. The ball screw mounting structure according to claim 4, characterized in that: The hardness of the transition part is greater than the hardness of the screw rod, and the transition part is made of wear-resistant material.

9. The ball screw mounting structure according to any one of claims 1 to 8, characterized in that: The U-shaped spring sheet includes a first stop arm and a second stop arm, and the connecting bearing includes an abutment portion and a limiting portion. The diameter of the abutment portion is smaller than the diameter of the limiting portion. The abutment portion passes through the second stop arm and abuts against the first stop arm, and the limiting portion is located on the outside of the second stop arm.

10. The ball screw mounting structure according to claim 9, characterized in that: The end surface of the abutting portion contacting the first blocking arm is an arc-shaped surface.

11. The ball screw mounting structure according to claim 9, characterized in that: The ends of the first barrier arm and the second barrier arm are both arc-shaped panels, and the center lines of the two arc-shaped panels coincide.

12. The ball screw mounting structure according to claim 9, characterized in that: The arc-shaped panels at the ends of the first barrier arm and the second barrier arm coincide with the center line of the connecting bearing.

13. A head-up display motor, characterized in that: The invention comprises the ball screw mounting structure as described in any one of claims 1 to 12.

14. The head-up display motor according to claim 13, characterized in that: The end of the screw rod assembly away from the U-shaped spring sheet is also provided with a transition portion and a connecting bearing, and the connecting bearing is connected to the bracket of the head-up display motor.

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