CN113315302B - linear motor - Google Patents
linear motorInfo
- Publication number
- CN113315302B CN113315302B CN202110595286.2A CN202110595286A CN113315302B CN 113315302 B CN113315302 B CN 113315302B CN 202110595286 A CN202110595286 A CN 202110595286A CN 113315302 B CN113315302 B CN 113315302B
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- China
- Prior art keywords
- transmission
- screw rod
- screw
- linear motor
- fixed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transmission Devices (AREA)
Abstract
本发明涉及传动技术领域，提供一种直线电机，包括：呈中空结构的固定丝杆，其外表面设有第一外螺纹；传动组件，传动组件包括中空结构的传动件以及传动螺母，传动组件套设于固定丝杆，传动螺母与第一外螺纹相配合，可沿固定丝杆轴线方向移动；以及驱动机构，驱动机构设于固定丝杆内，且其动力输出端与传动件相连接，用于驱动传动组件相对于固定丝杆旋转。驱动装置内置于呈中空结构的固定丝杆内，更加节省空间，有利于小型化设计。
This invention relates to the field of transmission technology and provides a linear motor, comprising: a hollow fixed lead screw with a first external thread on its outer surface; a transmission assembly including a hollow transmission component and a transmission nut, the transmission assembly being sleeved on the fixed lead screw, the transmission nut engaging with the first external thread and movable along the axis of the fixed lead screw; and a drive mechanism disposed within the fixed lead screw, with its power output end connected to the transmission component for driving the transmission assembly to rotate relative to the fixed lead screw. The drive mechanism is built into the hollow fixed lead screw, saving space and facilitating miniaturization.
Description
Technical Field
The invention relates to the technical field of transmission, in particular to a linear motor.
Background
The linear motor usually adopts a mode of matching a screw rod and a nut to realize lifting or stretching of parts such as a sleeve, and is often applied to devices such as lifting upright posts, electric push rods and the like which need lifting or stretching.
The existing lifting upright post, electric push rod and other devices are generally arranged to be in multi-stage lifting or multi-stage expansion, and a driving mechanism is arranged at the end part of a lifting assembly, so that the axial length or the axial height of the driving mechanism is overlarge, and the requirement of a user on the minimum height cannot be met.
Disclosure of Invention
The invention aims to provide a linear motor so as to solve the technical problem that the application scene is limited due to the fact that the whole linear motor is large in the prior art.
In order to achieve the above purpose, the invention adopts the technical scheme that a linear motor is provided, and the linear motor comprises:
the inner part of the fixed screw rod is hollow, and the outer surface of the fixed screw rod is provided with a first external thread;
the transmission assembly comprises a transmission part with a hollow structure and a transmission nut arranged at one end of the transmission part, wherein the transmission part and the transmission nut are sleeved on the fixed screw rod, and the internal thread of the transmission nut is matched with the first external thread;
The driving mechanism is arranged in the fixed screw rod, and the power output end of the driving mechanism is connected with the transmission piece and used for driving the transmission piece to rotate relative to the fixed screw rod.
In one embodiment, the transmission member is a transmission screw, and a second external thread for adapting to an external transmission structure is arranged on the outer surface of the transmission screw.
In one embodiment, the inner surface of the transmission member is provided with a first limiting portion along the axial direction of the transmission member, and the driving mechanism includes:
A power part fixed in the fixed screw rod and provided with a power output shaft extending out of the fixed screw rod, and
The linkage piece is fixed in the power output shaft and is located in the transmission piece, the linkage piece is provided with a first limit matching part, and the first limit matching part is in sliding fit with the first limit part.
In one embodiment, the power section is a motor having the power output shaft connected to the linkage, or the power section includes a motor and a gear box connected to the output shaft of the motor, the gear box having the power output shaft of the power, the power output shaft being connected to the linkage.
In one embodiment, the drive nut has a mounting section and a base section connected to the mounting section, the mounting section extending into the drive member.
In one embodiment, the outer surface of the mounting section is provided with a limit groove structure matched with the first limit part, and/or the base section is connected with the transmission part through a screw.
In one embodiment, the second external thread has a direction of rotation opposite to the direction of rotation of the first external thread.
In one embodiment, the linear motor further comprises a screw nut threadedly engaged with the second external thread of the transmission member.
In one embodiment, the linear motor further comprises a plurality of screw rod layer assemblies, each screw rod layer assembly is sleeved and assembled from inside to outside in sequence, the screw rod layer assembly at the innermost layer is sleeved and arranged on the transmission piece, the transmission piece can drive each screw rod layer assembly to rotate and move along the axial direction of the transmission piece, and the linear motor further comprises a screw rod nut sleeved and arranged at the outermost layer of the screw rod layer assembly.
In one embodiment, the linear motor further comprises a fixing portion, one end of the fixing screw rod is fixed to the fixing portion, the fixing portion is provided with a protruding portion, the fixing screw rod is sleeved on the protruding portion, and the shape of the outer surface of the protruding portion is matched with the shape of the inner surface of the fixing screw rod to limit the relative rotation of the fixing screw rod and the protruding portion.
The above-mentioned one or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
The linear motor provided by the embodiment of the invention is provided with the fixed screw rod, the transmission component sleeved on the fixed screw rod and the driving mechanism with the power output end connected with the transmission component. The transmission assembly comprises a transmission part and a transmission nut, wherein the transmission part is of a hollow structure, the transmission nut is arranged at one end of the transmission part, the inner surface of the transmission nut is provided with internal threads, and the outer surface of the fixed screw rod is provided with first external threads, namely the internal threads of the transmission nut are matched with the first external threads.
The external transmission mechanism is arranged on the outer surface of the transmission piece. Under the cooperation of the internal thread and the first external thread of the transmission nut, the transmission assembly can do linear motion along the axial direction of the fixed screw rod while doing rotary motion, thereby realizing the lifting or the expansion of the transmission assembly. And the inside of the fixed screw rod is hollow, the driving mechanism is arranged in the fixed screw rod, and the power output end of the driving mechanism extends to the outside of the fixed screw rod and is connected with the transmission assembly. So set up, actuating mechanism then does not occupy external space, can improve space utilization, and more do benefit to drive transmission subassembly and rotate for fixed lead screw, shorten the connection cooperation length between actuating mechanism and the transmission subassembly, improve transmission stability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exploded view of a linear motor according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a linear motor according to an embodiment of the present invention;
fig. 3 is a schematic top view of a linear motor according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3;
fig. 5 is a schematic structural diagram of a linear motor according to an embodiment of the present invention, with a transmission assembly and a screw nut removed;
Fig. 6 is an exploded view of a transmission assembly of a linear motor according to an embodiment of the present invention.
Wherein, each reference sign in the figure:
100. the device comprises a linear motor, 10 parts of a fixed screw rod, 101 parts of a first external thread, 20 parts of a transmission assembly, 20a parts of a transmission member, 20b parts of a transmission nut, 20b1 parts of a mounting section, 20b2 parts of a base section, 20c parts of a limiting groove structure, 201 parts of a second external thread, 30 parts of a screw rod nut, 40 parts of a driving mechanism, 41 parts of a power part, 42 parts of a linkage part, 50 parts of a fixed part, 51 parts of a protruding part, 202 parts of a first limiting part, 410 parts of a power output shaft, 420 parts of a first limiting matching part, 411 parts of a motor, 412 parts of a gear box.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 4, an embodiment of the present application provides a linear motor 100 for lifting or telescoping transmission, which can be applied to devices that need to achieve lifting or telescoping functions, such as lifting columns, electric pushrods, lifters, lifting tables, etc., but not limited thereto, wherein the linear motor 100 comprises a fixed screw 10, a transmission assembly 20 and a driving mechanism 40, and wherein:
the fixed screw 10 is fixedly arranged, namely, does not perform rotary motion or linear motion, the fixed screw 10 is hollow inside, and the outer surface of the fixed screw 10 is provided with a first external thread 101.
The transmission assembly 20 comprises a transmission member 20a and a transmission nut 20b which are both in a hollow structure, wherein the transmission nut 20b is arranged at one end of the transmission member 20a, the transmission member 20a and the transmission nut 20b are both sleeved on the fixed screw 10, and the transmission nut 20b is matched or screwed with the first external thread 101, so that the transmission member 20a and the transmission nut 20b can do linear motion relative to the fixed screw 10 under the matching of the internal thread and the external thread when doing rotary motion relative to the fixed screw 10.
The driving mechanism 40 is disposed in the hollow fixed screw 10, and a power output end thereof is connected with the transmission member 20a of the transmission assembly 20 for driving the transmission assembly 20 to rotate relative to the fixed screw 10, wherein the driving mechanism 40 refers to a mechanism or device capable of providing driving force and driving the transmission assembly 20 to rotate relative to the fixed screw 10, for example, the driving mechanism 40 may include a motor and a transmission member connected with an output end of the motor, and the driving force is provided by the motor to drive the transmission assembly 20 to rotate relative to the fixed screw 10. Alternatively, the drive mechanism 40 may be a motor, with the output of the motor directly driving the transmission assembly 20.
The linear motor 100 provided by the embodiment of the application is provided with the fixed screw rod 10, the transmission component 20 sleeved on the fixed screw rod 10 and the driving mechanism 40 with the power output end connected with the transmission component 20. The transmission assembly 20 includes a transmission member 20a having a hollow structure and a transmission nut 20b disposed at one end of the transmission member 20a, wherein an inner surface of the transmission nut 20b has an internal thread, and an outer surface of the fixing screw 10 is provided with a first external thread 101, i.e., the internal thread of the transmission nut 20b is matched with the first external thread. The driving mechanism 40 drives the transmission assembly 20 to perform rotary motion relative to the fixed screw 10, and under the cooperation of the internal thread of the transmission nut 20b and the first external thread 101, the transmission assembly 20 can perform linear motion along the axial direction of the fixed screw 10 (i.e. the axial direction of the fixed screw 10) while performing rotary motion, so as to realize lifting or stretching of the transmission assembly 20. And, the inside of the fixed screw 10 is hollow, the driving mechanism 40 is arranged inside the fixed screw 10, and the power output end of the driving mechanism 40 extends to the outside of the fixed screw 10 and is connected with the transmission assembly 20. So set up, actuating mechanism 40 sets up in the inside of fixed lead screw 10, does not occupy the external space, can improve space utilization, and more do benefit to drive transmission assembly 20 and rotate for fixed lead screw 10, shorten the connection cooperation length between actuating mechanism 40 and the transmission assembly 20, improve transmission stability.
Referring to fig. 1 and 2, the transmission member 20a is a transmission screw, and the outer surface of the transmission screw is provided with a second external thread 201 for adapting to an external transmission structure. The driving mechanism 40 drives the transmission assembly 20 to do rotary motion relative to the fixed screw 10, under the cooperation of the internal thread of the transmission nut 20b and the first external thread 101, the transmission assembly 20 can do linear motion along the axial direction of the fixed screw 10 (namely, the axial direction of the fixed screw 10) while doing rotary motion, so as to achieve lifting or stretching of the transmission assembly 20, meanwhile, the rotation of the transmission screw can drive the peripheral transmission mechanism of which the threads are matched with the second external thread 201 to do linear motion along the axial direction of the transmission screw through the second external thread 201, so that the peripheral transmission mechanism of which the threads are matched with the second external thread 201 moves relative to the transmission screw while moving along with the axial direction of the transmission screw relative to the fixed screw 10, namely, the peripheral transmission mechanism of which the threads are matched with the second external thread moves relative to the transmission screw, thereby achieving rapid lifting or stretching of the peripheral transmission mechanism of which the threads are matched with the second external thread 201, and further achieving rapid lifting or stretching of devices such as lifting columns and electric push rods of the linear motor 100, and effectively improving lifting or stretching efficiency.
In another embodiment, the driving member 20a is a hollow tube, and the peripheral driving structure is fixedly connected to the hollow tube. It will be appreciated that in this case, the external transmission structure or the mechanism to be transmitted is directly fixed on the outer side of the hollow tube body, that is, is driven by the hollow tube body to move in a telescopic manner along the axial direction of the fixed screw 10, and at this time, primary transmission of the external transmission structure is realized.
In an embodiment, please refer to fig. 1 and 2, the linear motor 100 further includes a fixing portion 50, one end of the fixing screw 10 is fixed to the fixing portion 50, wherein the fixing portion 50 may be a base, the fixing screw 10 may be vertically fixed to the fixing portion 50, the fixing portion 50 may be a base, the fixing screw 10 may be transversely fixed to the fixing portion 50, and of course, the fixing portion 50 may have other structures. So set up, fixed screw 10 can be fixed to fixed portion 50, prevents that fixed screw 10 from moving, reinforcing stability.
It should be noted that, in other embodiments, the linear motor 100 may not be provided with the fixing portion 50, and the fixing screw 10 may be directly fixed to a device to which the linear motor 100 is applied, for example, the fixing screw 10 may be directly fixed to a housing of the lifting column.
Optionally, in an embodiment, referring to fig. 2 and 4, the fixing portion 50 has a protruding portion 51, the fixing screw 10 is sleeved on the protruding portion 51, that is, the protruding portion 51 is inserted into the protruding portion, so that the protruding portion 51 cooperates with a cavity of the fixing screw 10, so that the fixing screw 10 is prevented from deflecting or moving relative to the fixing portion 50, and stability of the fixing screw 10 is improved.
In other embodiments, the protruding portion 51 may not be provided, and for example, the fixing screw 10 and the fixing portion 50 may be directly fixedly connected by a screw, a bolt, a rivet, or a welding.
Alternatively, in one embodiment, referring to fig. 2 and 4, the shape of the outer surface of the protruding portion 51 is matched with the shape of the inner surface of the cavity of the fixing screw 10 to limit the relative rotation between the fixing screw 10 and the protruding portion 51, where the protruding portion 51 is a non-cylindrical protruding portion, and in this case, the fixing screw 10 and the protruding portion 51 may be limited to rotate relatively, for example, the protruding portion 51 may be prismatic (for example, quadrangular), may be a protruding column with an oval cross section, or may be a protruding column with another regular or irregular shape. By such arrangement, the protruding portion 51 is matched with the cavity of the fixed screw 10, so that the fixed screw 10 can be prevented from rotating, the stability of the fixed screw is further improved, and the stability of the transmission assembly 20 in rotary motion and linear motion relative to the fixed screw 10 is further improved.
Alternatively, in one embodiment, referring to fig. 4, the fixing screw 10 is detachably fixed to the fixing portion 50, for example, the fixing screw 10 may be fixed to the fixing portion 50 by a screw or a bolt. So arranged, the disassembly and the assembly between the fixed screw 10 and the fixed part 50 are facilitated.
In one embodiment, referring to fig. 2 and fig. 4, the rotation direction of the second external thread 201 is opposite to the rotation direction of the first external thread 101, so that the movement direction of the external transmission mechanism screwed to the second external thread 201 when doing linear motion is identical to the movement direction of the transmission screw when doing linear motion, thereby realizing that the external transmission mechanism screwed to the second external thread 201 and the transmission member 20a are lifted or contracted simultaneously in the same direction, wherein the rotation direction refers to the screwing direction of the thread, the thread screwed in when rotating clockwise is referred to as a right-handed thread, and the thread screwed in when rotating counterclockwise is referred to as a left-handed thread.
In one embodiment, referring to the drawings, the inner surface of the transmission member 20a is provided with a plurality of first limiting portions 202 along the axial direction of the transmission member 20a, the driving mechanism 40 includes a power portion 41 and a linkage member 42, the power portion 41 is fixed on the fixed screw 10, specifically, the power portion 41 may be fixed inside the fixed screw 10, for example, the power portion 41 may be fixed inside the fixed screw 10 by means of clamping, welding, screwing or bolting, etc., but not limited thereto, the power portion 41 is located at one end of the fixed screw 10 facing away from the fixed portion 50, the power portion 41 has a power output shaft 410, the power output shaft 410 extends to the outside of the fixed screw 10, the linkage member 42 is fixed on the power output shaft 410 and located inside the transmission assembly 20, the linkage member 42 has a plurality of first limiting engagement portions 420, and the first limiting engagement portions 420 are in sliding engagement with the first limiting portions 202, so that the linkage member 42 and the transmission assembly 20 can be limited to rotate relatively, and can only move relatively linearly; the linkage member 42 is an intermediate power transmission member capable of transmitting the rotational power of the power output shaft 410 to the transmission assembly 20, for example, the linkage member 42 may be a spline, a cylindrical, fan-shaped, bar-shaped linkage member, or another linkage member with regular or irregular shape, specifically, the first limit portion 202 may be a protruding strip protruding from the inner surface of the transmission assembly 20 along the axial direction of the transmission assembly 20, the first limit engaging portion 420 may be a sliding groove provided on the outer peripheral surface of the linkage member 42, or of course, the first limit portion 202 may be a sliding groove recessed from the inner surface of the transmission assembly 20 along the axial direction of the transmission assembly 20, and the first limit engaging portion 420 may be a protruding strip or protrusion protruding from the outer peripheral surface of the linkage member 42 and slidably engaged with the protruding strip or protrusion through the sliding groove, the linkage member 42 and the transmission assembly 20 can be limited to rotate relatively, so that the transmission assembly 20 can be driven to rotate when the linkage member 42 rotates, and meanwhile, the transmission assembly 20 can move relatively linearly with the linkage member 42 when moving linearly with respect to the fixed screw rod 10. When the device works, the power output shaft 410 of the device drives the linkage piece 42 to rotate through the action of the power part 41, the linkage piece 42 drives the transmission assembly 20 to rotate through the cooperation of the first limiting part 202 and the first limiting cooperation part 420, the transmission assembly 20 moves linearly relative to the fixed screw rod 10 under the cooperation of the second external thread 201 and the first external thread 101, the transmission assembly 20 and the linkage piece 42 move linearly relatively, and the linkage piece 42 can support and stabilize the transmission assembly 20. The arrangement is beneficial to the driving mechanism 40 to stably drive the transmission assembly 20 to simultaneously perform rotary motion and linear motion relative to the fixed screw rod 10, so that the fixed screw rod 10, the driving mechanism 40 and the transmission assembly 20 are matched with each other in a compact structure and high stability.
Alternatively, in one embodiment, referring to fig. 2 and 4, the power unit 41 includes a motor 411 and a gear box 412, the motor 411 is mounted inside the fixed screw 10, an input end of the gear box 412 is connected with an output shaft of the motor 411, the gear box 412 has a power output shaft 410, specifically, the motor 411 and the gear box 412 are both fixed inside the fixed screw 10, it is understood that the gear box 412 may be any one of existing gear boxes, and in operation, the power of the motor 411 is transferred from the output shaft thereof to the gear box 412, from a gear set inside the gear box 412 to the power output shaft 410, and then to the linkage 42 through the action of the power unit 41.
It should be noted that, the structure of the power portion 41 is not limited to this, and in other embodiments, the power portion 41 may be a gear motor, and the gear motor has a power output shaft 410. In one embodiment, the drive mechanism 40 is a motor, the power output shaft of which is coupled to the linkage.
In one embodiment, referring to fig. 1, 4 and 6, the drive nut 20b has a mounting section 20b1 and a base section 20b2 connected to the mounting section 20b1, the mounting section 20b1 extending into the drive member 20 a. It will be appreciated that in order to improve the quick connection of the drive nut to the drive member 20a, as well as the connection stability. When installed, the mounting section 20b1 can extend into the transmission member 20a to perform positioning and supporting functions.
In one embodiment, referring to fig. 6, a limiting groove structure 20c adapted to the first limiting portion 202 is formed on an outer surface of the mounting section 20b 1. It can be appreciated that the connection stability of the driving member 20a and the driving nut 20b is further improved by the adaptation of the first limiting portion 202 and the limiting groove structure 20c. That is, when the driver 20a and the driver nut 20b are coupled by a screw, the screw is subjected to a shearing force by a torsion force therebetween, and is easily broken. The first limiting portion may be a rib disposed along an axial direction of the driving member 20a, and the limiting groove structure 20c is also disposed along an axial direction of the mounting section 20b1, so that the nut section and the screw section form a binding force in a circumferential direction, and the connection stability is greatly improved. Meanwhile, to further provide stability between the drive nut and the drive member 20a, a screw-in screw is attached to the end face of the drive member 20a at the end face of the base section 20b 2.
Optionally, in one embodiment, the screw rod layer assembly includes a plurality of hollow screw rods, the hollow screw rods are hollow, the inner surfaces of the hollow screw rods are provided with internal threads, the outer surfaces of the hollow screw rods are provided with external threads, each hollow screw rod is sleeved in turn from inside to outside, the internal threads of the hollow screw rod of the outer layer of the two adjacent hollow screw rods are matched or screwed with the external threads of the hollow screw rod of the inner layer, the hollow screw rod of the innermost layer is sleeved on the transmission member 20a, and the internal threads of the hollow screw rod of the innermost layer are matched or screwed with the second external threads 201 of the transmission member 20 a. The second external screw threads 201 drive the hollow screw rods to perform linear movement and/or rotational movement by rotating the transmission member 20a, thereby realizing multi-stage lifting or telescoping. Parameters such as the lead angle of the second external thread 201 and the external thread of each hollow screw may be set according to practical application requirements, as will be apparent to those skilled in the art.
Optionally, in one embodiment, the screw layer assembly includes a driven screw and a nut body, the driven screw is hollow, an external thread is disposed on an outer surface of the driven screw, and the nut body is fixedly connected with one end of the driven screw, that is, the structural form of the screw layer assembly is the same as that of the transmission assembly 20. The driven screw rod of the innermost screw rod layer assembly is sleeved on the transmission piece 20a, the nut main body of the innermost screw rod layer assembly is in threaded fit with the second external thread 201, the driven screw rod of the innermost screw rod layer assembly is in fit with the transmission piece 20a, when the number of the screw rod layer assemblies is one, the outermost screw rod layer assembly and the innermost screw rod layer assembly are the same screw rod layer assembly, and the transmission piece 20a can drive each screw rod layer assembly to rotate and move along the axial direction of the transmission piece 20a, so that multistage lifting or stretching of four stages or more is realized.
Specifically, when the number of the screw rod layer assemblies is one, the driving mechanism 40 drives the driving member 20a to perform rotary motion and linear motion, the driving member 20a drives the driven screw rod to rotate during rotary motion, and meanwhile, the second external thread 201 drives the nut of the screw rod layer assembly to perform linear motion relative to the driving member 20a, so that the driven screw rod simultaneously performs linear motion and rotary motion, and the driven screw rod performs rotary motion, in this case, the fixed screw rod 10 can be regarded as a first stage, the driving member 20a can be regarded as a second stage, and the driven screw rod can be regarded as a third stage, thereby realizing three-stage lifting or telescoping, and the driving member 20a, the driven screw rod and the screw rod nut 30 can be lifted or telescoping simultaneously, thereby effectively improving efficiency.
Specifically, when the number of the screw rod layer assemblies is two or more, the driving part 20a is sleeved with the innermost screw rod layer assembly, the driven screw rod of the secondary inner screw rod layer assembly is sleeved with the driven screw rod of the innermost screw rod layer assembly, the nut screw thread of the secondary inner screw rod layer assembly is matched with the external screw thread of the driven screw rod of the innermost screw rod layer assembly, the driven part of the secondary inner screw rod layer assembly is fixed to the driven screw rod of the innermost screw rod layer assembly, and the like, all the screw rod layer assemblies are sequentially sleeved and assembled from inside to outside, and can drive all the screw rod layer assemblies to rotate and axially move along the driving part 20a through the rotation and the linear motion of the driving part 20a, so that five-stage and more than five-stage multi-stage lifting or expansion can be realized.
In an embodiment, referring to fig. 1 and 4, the linear motor 100 further includes a screw nut 30, the screw nut 30 is sleeved on the transmission member 20a, an internal thread is disposed on an inner surface of the screw nut 30, the screw nut 30 may limit rotation of the screw nut 30 by a device to which the linear motor 100 is applied, the transmission member 20a may drive the screw nut 30 to move along an axial direction of the transmission member 20a through the second external thread 201, wherein the screw nut 30 is sleeved on the transmission member 20a, meaning that the screw nut 30 is directly sleeved on the transmission member 20a or sleeved on the transmission member 20a through an intermediate member, in which one way, the screw nut 30 may be directly sleeved on the transmission member 20a and threadedly engaged with the second external thread 201, and the screw nut 30 is directly driven to perform linear motion through the second external thread 201 when the transmission member 20a rotates.
In another embodiment, the screw nut 30 is sleeved on the screw layer assembly, and the transmission member 20a drives the screw layer assembly to perform linear motion through the second external thread 201 when rotating, so as to indirectly drive the screw nut 30 to perform linear motion. For example, the screw layer assembly may be a hollow screw sleeved on the transmission member 20a, the screw nut 30 may be screwed on the outermost hollow screw, in this case, when the hollow screw is one, the fixed screw 10 may be regarded as a first stage, the transmission member 20a may be regarded as a second stage, the hollow screw may be regarded as a third stage, the screw nut 30 may be regarded as a fourth stage, thereby realizing four-stage lifting or telescoping, and so on, the hollow screw may be provided in plurality, each hollow screw may be sequentially sleeved from inside to outside, and the screw nut 30 is screwed on the outermost hollow screw, thereby realizing multi-stage lifting or telescoping.
Alternatively, in one embodiment, referring to fig. 1 and 4, the screw nut 30 is screwed to the second external thread 201 of the transmission member 20a, that is, the internal thread of the screw nut 30 is matched or screwed with the second external thread 201, the transmission member 20a is driven to rotate and linearly move relative to the fixed screw 10 by the linkage member 42 of the driving mechanism 40, the transmission member 20a drives the screw nut 30 to linearly move relative to the transmission member 20a, at this time, the fixed screw 10 can be regarded as a first stage, the transmission member 20a can be regarded as a second stage, and the screw nut 30 can be regarded as a third stage, thereby realizing three-stage lifting or telescoping, higher stability, and simultaneous lifting or telescoping of the transmission member 20a and the screw nut 30 can improve efficiency.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A linear motor, the linear motor comprising:
the inner part of the fixed screw rod is hollow, and the outer surface of the fixed screw rod is provided with a first external thread;
The transmission assembly comprises a transmission part with a hollow structure and a transmission nut arranged at one end of the transmission part, wherein the transmission part and the transmission nut are sleeved on the fixed screw rod, the internal threads of the transmission nut are matched with the first external threads, and a first limiting part is arranged on the inner surface of the transmission part along the axial direction of the transmission part;
The driving mechanism is arranged in the fixed screw rod, a power output end of the driving mechanism is connected with the transmission piece and used for driving the transmission piece to rotate relative to the fixed screw rod, the driving mechanism comprises a power part and a linkage piece, the power part is fixed in the fixed screw rod and provided with a power output shaft extending out of the fixed screw rod, the linkage piece is fixed on the power output shaft and positioned in the transmission piece, and the linkage piece is provided with a first limit matching part which is in sliding fit with the first limit part.
2. The linear motor of claim 1, wherein the transmission member is a transmission screw, and a second external thread for adapting to an external transmission structure is arranged on the outer surface of the transmission screw.
3. The linear motor of claim 1, wherein the power section is a motor having the power output shaft connected to the linkage, or the power section includes a motor and a gear box connected to an output shaft of the motor, the gear box having the power output shaft of the power, the power output shaft being connected to the linkage.
4. The linear motor of claim 1, wherein the drive nut has a mounting section and a base section connected to the mounting section, the mounting section extending into the drive member.
5. The linear motor of claim 4, wherein the outer surface of the mounting section is provided with a limit groove structure matched with the first limit part, and/or the base section is connected with the transmission part through a screw.
6. The linear motor of claim 2, wherein the second external thread has a direction of rotation opposite to a direction of rotation of the first external thread.
7. The linear motor of claim 2, further comprising a lead screw nut threadedly engaged with the second external thread of the transmission member.
8. The linear motor according to any one of claims 1 to 4, further comprising a plurality of screw rod layer assemblies, wherein each screw rod layer assembly is sleeved and assembled from inside to outside, the screw rod layer assembly at the innermost layer is sleeved and assembled on the transmission member, the transmission member can drive each screw rod layer assembly to rotate and move along the axial direction of the transmission member, and the linear motor further comprises a screw rod nut sleeved and assembled at the outermost layer of the screw rod layer assembly.
9. The linear motor of claim 1, further comprising a fixing portion, wherein one end of the fixing screw is fixed to the fixing portion, the fixing portion is provided with a protruding portion, the fixing screw is sleeved on the protruding portion, and the shape of the outer surface of the protruding portion is matched with the shape of the inner surface of the fixing screw to limit relative rotation of the fixing screw and the protruding portion.
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| CN202110595286.2A CN113315302B (en) | 2021-05-28 | 2021-05-28 | linear motor |
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| CN202110595286.2A CN113315302B (en) | 2021-05-28 | 2021-05-28 | linear motor |
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| CN113315302A CN113315302A (en) | 2021-08-27 |
| CN113315302B true CN113315302B (en) | 2025-11-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206274064U (en) * | 2016-11-30 | 2017-06-23 | 深圳市兆威机电有限公司 | Screw nut driving pair and insulin pump |
| CN112713692A (en) * | 2020-12-24 | 2021-04-27 | 北方工业大学 | Motor with output end extending to shell and motor with waterproof structure |
| CN215221933U (en) * | 2021-05-28 | 2021-12-17 | 深圳市兆威机电股份有限公司 | Linear motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202100671U (en) * | 2011-06-17 | 2012-01-04 | 宁波迪麦格磁电科技有限公司 | Electric pushing rod |
| CN111207194B (en) * | 2020-03-10 | 2024-11-19 | 东莞孜升传动有限公司 | A screw rod sliding device and automatic push rod thereof |
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2021
- 2021-05-28 CN CN202110595286.2A patent/CN113315302B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206274064U (en) * | 2016-11-30 | 2017-06-23 | 深圳市兆威机电有限公司 | Screw nut driving pair and insulin pump |
| CN112713692A (en) * | 2020-12-24 | 2021-04-27 | 北方工业大学 | Motor with output end extending to shell and motor with waterproof structure |
| CN215221933U (en) * | 2021-05-28 | 2021-12-17 | 深圳市兆威机电股份有限公司 | Linear motor |
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