Motor screw rod capable of being directly connected

Abstract

The utility model discloses a motor screw rod capable of being directly connected. The motor screw rod comprises a screw rod, a rotor, a motor stator, a pre-tightening piece, a front bearing seat and a rear bearing seat, the rotor part is located between the front bearing part and the rear bearing part, the thread part is located on one side of the front bearing part, the front bearing part is rotationally connected with the front bearing seat, the pre-tightening piece is arranged on the front bearing part in a sleeving mode and located in the front bearing seat, the pre-tightening piece is used for applying pressure to the interior of the front bearing seat, and the rotor is integrally arranged on the rotor part. The motor stator is located between the front bearing seat and the rear bearing seat, the rotor is matched with the motor stator, the end of the rear bearing part penetrates through the rear bearing seat, and the rear bearing seat is rotationally connected with the rear bearing part. According to the utility model, the matching error of the rotor and the screw rod can be avoided, the backlash between the rotor and the motor stator can be better controlled, the requirement of axial zero clearance is met, and the motor screw rod can be used under the working condition of high-precision positioning.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor lead screw that can be directly connected. Background Technology

[0002] A lead screw, also known as a screw rod or helical push rod, typically consists of a nut and a screw, transmitting power and motion using the friction of a helix. One part is fixed, while the other rotates or moves linearly. When the screw rotates, the nut moves linearly due to the helix's movement, and vice versa. This conversion mechanism is ideal for applications requiring high-precision control. However, current lead screws suffer from axial clearance in high-precision positioning applications. Furthermore, the rotor and lead screw have misalignment, and the backlash between the rotor and stator is significant, making them unsuitable for high-precision positioning. Summary of the Invention

[0003] According to an embodiment of the present utility model, a directly connectable motor lead screw is provided, comprising: a screw, a rotor, a motor stator, a preload member, a front bearing housing, and a rear bearing housing;

[0004] The screw has: a threaded section, a front bearing section, a rotor section, and a rear bearing section;

[0005] The rotor section is located between the front bearing section and the rear bearing section. The threaded section is located on one side of the front bearing section. The front bearing section is rotatably connected to the front bearing housing. The preload is sleeved on the front bearing section and located inside the front bearing housing. The preload is used to apply pressure to the front bearing housing. The rotor is integrally mounted on the rotor section. The motor stator is located between the front bearing housing and the rear bearing housing. The rotor and the motor stator cooperate. The end of the rear bearing section passes through the rear bearing housing. The rear bearing housing is rotatably connected to the rear bearing section.

[0006] Furthermore, it includes: a first front bearing and a second front bearing;

[0007] The first front bearing and the second front bearing are both sleeved on the front bearing portion of the screw and are both located inside the front bearing housing. The preload is used to apply pressure to the first front bearing and the second front bearing.

[0008] Furthermore, it includes: the rear bearing;

[0009] The rear bearing housing has a bearing groove, and the rear bearing is sleeved on the rear bearing portion of the bolt and located within the bearing groove of the rear bearing housing.

[0010] Furthermore, it includes: an encoder;

[0011] The encoder is located on one side of the rear bearing housing, and the end of the rear bearing housing is connected to the encoder.

[0012] According to an embodiment of the present invention, a directly-connectable motor lead screw is provided. This application avoids the error in the fit between the rotor and the lead screw by designing the rotor part of the lead screw as an integral part of the rotor, and better controls the tooth backlash between the rotor and the motor stator. By applying pressure to the front bearing housing through the preload, the two bearings in the front bearing housing achieve the requirement of zero axial clearance, enabling the motor lead screw to be used in high-precision positioning conditions. The double bearing structure can withstand greater axial thrust, enabling the motor lead screw to be used in high-thrust conditions.

[0013] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0014] Figure 1 This is a structural diagram of a directly connectable motor lead screw according to an embodiment of the present invention;

[0015] Figure 2 This is a cross-sectional view of a directly connectable motor lead screw according to an embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view of a directly connectable motor lead screw according to an embodiment of the present invention.

[0017] In the figure, the following labels are used: 1 is the screw, 11 is the threaded part, 12 is the front bearing part, 13 is the rotor part, 14 is the rear bearing part, 2 is the rotor, 3 is the motor stator, 4 is the preload, 5 is the front bearing housing, 51 is the first front bearing, 52 is the second front bearing, 6 is the rear bearing housing, 61 is the rear bearing, and 7 is the encoder. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0019] First, combine Figures 1-3 This invention describes a directly-connectable motor lead screw according to an embodiment of the present invention, used in high-precision positioning applications.

[0020] like Figures 1-3 As shown, a direct-connectable motor lead screw according to an embodiment of the present invention includes: a screw 1, a rotor 2, a motor stator 3, a preload 4, a front bearing housing 5, and a rear bearing housing 6;

[0021] The screw 1 has: a threaded portion 11, a front bearing portion 12, a rotor portion 13, and a rear bearing portion 61 14;

[0022] The rotor portion 13 is located between the front bearing portion 12 and the rear bearing portion 61 14. The threaded portion 11 is located on one side of the front bearing portion 12. The front bearing portion 12 is rotatably connected to the front bearing housing 5. The preload 4 is sleeved on the front bearing portion 12 and located inside the front bearing housing 5. The preload 4 is used to apply pressure inside the front bearing housing 5. The rotor 2 is integrally mounted on the rotor portion 13. The motor stator 3 is located between the front bearing housing 5 and the rear bearing housing 6. The rotor 2 and the motor stator 3 cooperate. The end of the rear bearing portion 61 14 passes through the rear bearing housing 6. The rear bearing housing 6 and the rear bearing portion 61 14 are rotatably connected.

[0023] By integrating the rotor section 13 of the screw 1 with the rotor 2, errors in the fit between the rotor 2 and the screw 1 are avoided, and the backlash between the rotor 2 and the motor stator 3 is better controlled. Pressure is applied to the front bearing housing 5 by the preload 4 to achieve zero axial backlash, enabling the motor screw to be used in high-precision positioning conditions. In this embodiment, the preload 4 is a nut, and the screw 1 is made of stainless steel.

[0024] like Figures 2-3 As shown, it includes: a first front bearing 51 and a second front bearing 52;

[0025] The first front bearing 51 and the second front bearing 52 are both sleeved on the front bearing portion 12 of the screw 1 and are both located in the front bearing seat 5. The preload 4 is used to apply pressure to the first front bearing 51 and the second front bearing 52.

[0026] By applying pressure to the first front bearing 51 through the preload element 4, the axial clearance between the first front bearing 51 and the second front bearing 52 is made zero. The two bearings bear the axial thrust, enabling the motor lead screw to be used under high thrust conditions.

[0027] like Figures 2-3 As shown, it includes: a rear bearing 61 and an encoder 7;

[0028] The rear bearing housing 6 has a bearing groove, and the rear bearing 61 is sleeved on the rear bearing 61 part 14 of the bolt and located in the bearing groove of the rear bearing housing 6.

[0029] The encoder 7 is located on one side of the rear bearing housing 6, and the end of the rear bearing 61 part 14 is connected to the encoder 7.

[0030] The encoder 7 can record the rotation distance of the screw 1.

[0031] Above, refer to Figures 1-3This invention describes a direct-connectable motor lead screw according to an embodiment of the present invention. By integrating the rotor portion 13 of the screw 1 with the rotor 2, errors in the fit between the rotor 2 and the screw 1 are avoided, and the backlash between the rotor 2 and the motor stator 3 is better controlled. Pressure is applied to the front bearing housing 5 by the preload member 4 to achieve the requirement of zero axial backlash, enabling the motor lead screw to be used in high-precision positioning conditions.

[0032] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A directly connectable motor lead screw, characterized by, The screw rod, the rotor, the motor stator, the pre-tightening piece, the front bearing seat and the rear bearing seat are included. The screw rod has a threaded part, a front bearing part, a rotor part and a rear bearing part. The rotor part is located between the front bearing part and the rear bearing part, the threaded part is located on one side of the front bearing part, the front bearing part is rotationally connected with the front bearing seat, the pre-tightening piece is sleeved on the front bearing part and located in the front bearing seat, the pre-tightening piece is used for applying pressure to the front bearing seat, the rotor is integrally arranged on the rotor part, the motor stator is located between the front bearing seat and the rear bearing seat, the rotor cooperates with the motor stator, and the end of the rear bearing part penetrates through the rear bearing seat. The first front bearing and the second front bearing are included.

2. The direct connect motor lead screw of claim 1, wherein, The first front bearing and the second front bearing are both sleeved on the front bearing part of the screw rod and located in the front bearing seat, and the pre-tightening piece is used for applying pressure to the first front bearing and the second front bearing. The rear bearing is included. The rear bearing seat has a bearing groove, and the rear bearing is sleeved on the rear bearing part of the screw rod and located in the bearing groove of the rear bearing seat.

3. The direct connect motor lead screw of claim 1 wherein, The encoder is included. The encoder is located on one side of the rear bearing seat, and the end of the rear bearing part is connected with the encoder. ​ 4. The direct connect motor lead screw of claim 1, wherein, ​ ​ ​

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