Linear reciprocating motor

Abstract

The invention belongs to the field of reciprocating motors, and provides a linear reciprocating motor which comprises a motor shell, a stator arranged in the motor shell, end covers fixedly mounted on the two sides of the motor shell, a rotor arranged in the motor shell, a reciprocating screw nut arranged on the inner side of the rotor, and reciprocating screw spindles slidably arranged on the two sides of the end covers. A closed thread groove is formed in the outer side of the reciprocating screw rod main shaft, a ball is arranged in the rotor, and a part of the ball extends into the closed thread groove; compared with the prior art, the pure mechanical linear reciprocating motion motor provided by the invention has the advantages that the structure, the cost, the efficiency and the occupied space are obviously improved, the maintenance difficulty is also reduced, and the pure mechanical linear reciprocating motion motor has the advantages of simple structure, excellent performance and low cost when in use.

Description

Technical Field

[0001] The invention belongs to the field of reciprocating motors, in particular to a linear reciprocating motor. Background Art

[0002] In daily production and life, there are various mechanical equipment. In order to achieve the purpose of the machine itself, designers have designed various motion forms and motion models in the machine equipment, such as: rotational motion, eccentric motion, swinging, linear motion, among which linear reciprocating motion is also a very common motion form and motion model. This simple motion model is involved in many occasions, such as vibrating screens, massage chairs, air hammers, etc.

[0003] Currently, common solutions for achieving linear reciprocating motion on the market include: Solution 1: Using a motor to drive a reduction gearbox to drive a crankshaft or cam mechanism, or directly driving a crankshaft or cam mechanism, and utilizing motion decomposition to convert circular motion into linear motion in a certain direction; Solution 2: Using a motor to drive a reduction gearbox to drive a rack, or directly driving a linear rack, in conjunction with a current commutator to achieve linear reciprocating motion; Solution 3: Using a lead screw motor in conjunction with a current commutator to achieve linear reciprocating motion. Others include: pneumatic cylinders, hydraulic cylinders, electric cylinders, etc. However, overall, these technical solutions still have the following shortcomings: complex structure, poor reliability, difficult maintenance, and high technical requirements. For example, traditional Solution 1 involves transmission technology, gearbox technology, coupling technology, and crankshaft or cam technology, while Solutions 2 and 3 are more complex, requiring not only basic mechanical technology but also electrical control technology, and the technical requirements for maintenance personnel are relatively high.

[0004] Therefore, those skilled in the art have proposed a linear reciprocating motor to solve the problems raised in the background art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a linear reciprocating motor to solve the problems existing in the prior art.

[0006] A linear reciprocating motor comprises a motor housing, a stator is arranged inside the motor housing, end covers are fixedly installed on both sides of the motor housing, a rotor is arranged inside the motor housing, a reciprocating screw nut is arranged inside the rotor, and a reciprocating screw main shaft is slidably arranged on both sides of the end covers;

[0007] A closed thread groove is provided on the outer side of the reciprocating screw main shaft, and a ball is provided inside the reciprocating screw nut, with a part of the ball extending into the closed thread groove.

[0008] Preferably, a bearing is installed on the inner side of the end cover.

[0009] Preferably, the number of the balls is at least three, the distance between two balls is greater than the distance at which the screw thread grooves intersect, and the balls are arranged on one side of the reciprocating screw main shaft.

[0010] Preferably, a lead angle is provided between the closed thread grooves, and the lead angle is between 15 degrees and 30 degrees.

[0011] Through the above technical solution,

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention provides a purely mechanical linear reciprocating motion motor, which has significant improvements in structure, cost, efficiency and space occupation compared to existing technical solutions, and also reduces the difficulty of repair and maintenance. It has the advantages of simple structure, excellent performance and low cost when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall cross-sectional view of the present invention;

[0015] Figure 2 Schematic diagram of the structure of the reciprocating screw main shaft in the present invention;

[0016] Figure 3 This is an expanded view of the threaded portion of the reciprocating screw main shaft in the present invention;

[0017] Figure 4 Schematic diagram of the installation structure of the middle ball of the present invention;

[0018] Figure 5 This is a structural diagram of the flat-laying method of the reciprocating screw main shaft in the present invention;

[0019] Figure 6 This is a structural diagram of the reciprocating screw spindle superposition method in the present invention.

[0020] In the picture:

[0021] 1. Motor housing; 2. Stator; 3. End cover; 4. Rotor; 5. Reciprocating screw nut; 6. Reciprocating screw spindle; 7. Closed thread groove; 8. Ball; 9. Tapered bearing; 10. Lead angle. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] Example 1: As shown in the attached Figure 1 To the attached Figure 4As shown: The present invention provides a linear reciprocating motor, comprising a motor housing 1, a stator 2 is arranged inside the motor housing 1, end covers 3 are fixedly installed on both sides of the motor housing 1, a rotor 4 is arranged inside the motor housing 1, a reciprocating screw nut 5 is arranged on the inner side of the rotor 4, a reciprocating screw main shaft 6 is slidably arranged on both sides of the end cover 3, a closed thread groove 7 is opened on the outer side of the reciprocating screw main shaft 6, a ball 8 is arranged inside the rotor 4, and a part of the ball 8 extends into the closed thread groove 7, wherein P is the step distance, β is the lead angle, L is the screw stroke, and D is the screw outer diameter, which can be adjusted according to actual application.

[0024] Specifically, power is applied to the stator 2 of the electric motor to generate a rotating magnetic field, which drives the rotor 4 to rotate. A reciprocating screw nut 5 with a reciprocating screw spindle embedded inside the rotor 4 rotates with the rotor 4. A ball 8 or a crescent is provided inside the rotor 4. The crescent or ball 8 moves along the direction of the screw thread, driving the reciprocating screw spindle 6 to move axially. When the crescent or ball 8 runs to the consistent farthest point, the ball 8 or the crescent mechanism continues to move after reversing under the guidance of the closed thread, and continues to turn to the other extreme point, and finally realizes a reciprocating screw mechanism embedded in the rotor 4 within the designed stroke range, driving the screw nut to rotate on the screw for linear reciprocating motion.

[0025] Preferably, a bearing 9 is installed on the inner side of the end cover 3, and the bearing 9 can be other bearings 9 that can eliminate axial force. The number of the balls 8 is at least three, and the distance between the two balls is greater than the distance where the screw thread grooves intersect, and they are arranged on one side of the reciprocating screw spindle 6. A lead angle 10 is set between the closed thread grooves 7, and the lead angle 10 is between 15 degrees and 30 degrees. When it is greater than 30 degrees, jamming will occur.

[0026] Furthermore, in some complex situations such as high precision and high load, we can consider using Figure 5 and Figure 6 As shown, two or more fully synchronized reciprocating motion structures are set in parallel in the reciprocating screw main shaft 6 to meet the needs. The basic principle is to synthesize the motion of two or more reciprocating screws into the main shaft to achieve reciprocating motion.

[0027] As can be seen from the above, when power is applied to the stator 2 of the electric motor, a rotating magnetic field is generated, which drives the rotor 4 to rotate. The reciprocating screw nut 5 with a reciprocating screw spindle embedded inside the rotor 4 rotates with the rotor 4. A ball 8 or a crescent is provided inside the rotor 4. The crescent or ball 8 moves along the direction of the screw thread, driving the reciprocating screw spindle 6 to move axially. When the crescent or ball 8 runs to the consistent farthest point, the ball 8 or the crescent mechanism continues to move after reversing under the guidance of the closed thread, and continues to turn to the other extreme point, and finally realizes a reciprocating screw mechanism embedded in the rotor 4 within the designed stroke range, driving the screw nut to rotate on the screw for linear reciprocating motion.

[0028] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0029] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] In the description of this specification, the reference terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0033] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A linear reciprocating motor, characterized in that: include: A motor housing (1), wherein a stator (2) is arranged inside the motor housing (1), end covers (3) are fixedly mounted on both sides of the motor housing (1), a rotor (4) is arranged inside the motor housing (1), a reciprocating screw nut (5) is arranged inside the rotor (4), and a reciprocating screw main shaft (6) is slidably arranged on both sides of the end cover (3); A closed thread groove (7) is provided on the outer side of the reciprocating screw main shaft (6), and a ball (8) is provided inside the reciprocating screw nut (5), with a portion of the ball (8) extending into the closed thread groove (7).

2. A linear reciprocating motor as claimed in claim 1, characterized in that: A bearing (9) is installed on the inner side of the end cover (3).

3. A linear reciprocating motor as claimed in claim 1, characterized in that: The number of the balls (8) is at least three, the distance between two balls is greater than the distance at which the screw thread grooves meet, and the balls are arranged on one side of the reciprocating screw main shaft (6).

4. A linear reciprocating motor as claimed in claim 1, characterized in that: A lead angle (10) is provided between the closed thread grooves (7), and the lead angle (10) is between 15 degrees and 30 degrees.

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