Planetary screw rod moving type planetary roller screw electric cylinder applied to EMB
By designing a planetary ball screw electric cylinder with a planetary ball screw, the circumferential rolling and axial movement of the planetary rollers are driven by electromagnetic fields, solving the problem of insufficient thrust in the narrow space inside the EMB and achieving efficient thrust output and precise displacement.
Patent Information
- Application Number
- CN202423069591.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Within the confined space of the EMB, existing electric cylinders struggle to provide relatively large thrust, limiting the normal operation and efficient production of the equipment.
The planetary roller screw electric cylinder adopts a planetary ball screw moving type. Through the special thread design of the planetary rollers, planetary ball screws and planetary nuts, the electromagnetic field generated by the motor drives the high magnetic magnet to rotate, realizing the circumferential rolling and axial movement of the planetary rollers. Combined with the structure of frameless motor and magnetic bearing, the space utilization is optimized.
It achieves high thrust output and high axial displacement accuracy within a limited space, making it suitable for space-constrained EMB applications.
Smart Images
Figure CN223666170U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of EMB power equipment, especially relates to a planetary screw rod mobile planetary roller screw electric cylinder applied to EMB. BACKGROUND
[0002] In modern industry and automation equipment, electric cylinders (electric cylinders) as a kind of key execution element, are widely used in various mechanical control systems. The main role of electric cylinder is to produce linear motion according to control signal, and is widely used in welding, assembly, carrying and many other fields. However, in many cases, the installation space of electric cylinder is strictly limited, which puts forward higher requirements for its design and application.
[0003] For the electric cylinder located in the electrical machine box (EMB), the internal space is often narrow, which limits the installation and operation of large electric cylinder. Although the space is limited, in many applications, the electric cylinder needs to provide relatively large thrust to ensure the normal operation of the equipment and efficient production. Therefore, how to realize high thrust output in limited space is a technical problem to be solved in current electric cylinder design.
[0004] In view of this problem, it is particularly important to improve the design of electric cylinder. CONTENT OF UTILITY MODEL
[0005] The utility model solves the technical problem in the prior art, and provides a planetary screw rod mobile planetary roller screw electric cylinder applied to EMB.
[0006] To achieve the above technical purpose, the utility model takes the technical scheme that:
[0007] A planetary screw rod mobile planetary roller screw electric cylinder applied to EMB, comprising an electric cylinder body, a motor, a planetary roller screw structure, a high magnetic magnet and a force transmission nut are installed in the electric cylinder body, the planetary roller screw structure comprises a planetary nut, a plurality of planetary rollers and a planetary screw rod, the planetary screw rod is located on the inner side of the planetary nut ring body, the planetary screw rod and the planetary nut are coaxially arranged, the planetary rollers are arranged in the gap between the planetary nut and the planetary screw rod, the axis of the planetary roller is parallel to the axis of the planetary screw rod and the planetary nut, the high magnetic magnet and the force transmission nut are fixedly connected on the motor, the force transmission nut is fixedly connected with the planetary nut, the motor can generate an electromagnetic field when electrified, the electromagnetic field can drive the high magnetic magnet to rotate, the high magnetic magnet drives the force transmission nut and the planetary nut to rotate, the planetary rollers can roll in the circumferential direction and move axially between the planetary screw rod and the planetary nut, the surfaces of the planetary rollers, the surface of the planetary screw rod and the inner surface of the planetary nut are all provided with threads, and the thread directions of the surface of the planetary screw rod and the inner surface of the planetary nut are opposite.
[0008] To optimize the above technical scheme, the specific measures taken also include:
[0009] The thread on the planet roller is an annular groove without a rotation direction.
[0010] The planet roller screw structure further comprises two roller end plates arranged in the cavity between the planet screw rod and the planet nut, and the two roller end plates are respectively located at two ends of the planet roller, and each end of the planet roller is provided with a roller end head which is rotatably mounted on the roller end plate.
[0011] The planet roller is arranged in an annular equi-radian manner around the planet screw rod.
[0012] The cylinder body of the electric cylinder is provided with a front cylinder cover and a rear cylinder cover, the front cylinder cover is arranged on the front opening of the cylinder body, the rear cylinder cover is arranged on the rear opening of the cylinder body, and the front cylinder cover is provided with a front cover hole for the planet screw rod to pass through.
[0013] The cylinder body of the electric cylinder is provided with two magnetic bearing, the two magnetic bearings are respectively arranged at the front and rear ends of the high-magnetic magnet, the outer rotor of the magnetic bearing is fixedly connected with the motor or the cylinder body of the electric cylinder, the inner rotor of the magnetic bearing is fixedly connected with the end of the high-magnetic magnet, and the outer rotor and the inner rotor of the magnetic bearing are rotatably connected through the ball.
[0014] The planet nut is rotatably connected with the front cylinder cover and / or the rear cylinder cover through an end bearing.
[0015] The thread pitches of the planet roller, the planet screw rod and the inner surface of the planet nut are equal.
[0016] The motor is fixedly arranged in the cylinder body of the electric cylinder through the motor mounting frame.
[0017] The motor is a frameless motor.
[0018] The utility model has the advantages of:
[0019] The utility model discloses a planetary roller surface, planetary screw rod surface and planetary nut inner surface all are provided with the thread, and the thread rotation direction of planetary screw rod surface and planetary nut inner surface is opposite, and the thread on planetary roller is annular groove without rotation direction, this makes planetary nut when rotating, can drive planetary roller rotate around planetary screw rod like planet, and planetary roller still moves axially between planetary screw rod and planetary nut, because the thread rotation direction of planetary screw rod surface and planetary nut inner surface is opposite, planetary nut drives planetary roller positive direction to move simultaneously, and planetary roller will drive planetary screw rod reverse movement, this means if the lead of planetary screw rod and planetary nut is same, planetary screw rod and planetary nut only rotate and do not have relative displacement, only planetary roller moves axially, and through change the lead of planetary screw rod and planetary nut, can make planetary screw rod and planetary nut produce relative displacement, and the user can make planetary screw rod only slightly produce axial movement when planetary nut rotates through pre-setting the lead of planetary screw rod and planetary nut, and the axial displacement precision of planetary screw rod is higher when the lead is small, therefore, the planetary screw rod movable planetary roller screw cylinder of the utility model is very suitable for application in the EMB of the space with very high requirement. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is the initial position state diagram of the planetary roller screw structure of the utility model;
[0021] Figure 2 It is the maximum stroke position state diagram of the planetary roller screw structure of the utility model;
[0022] The reference numerals in the drawings are: electric cylinder body 1, motor 2, motor mounting frame 21, planetary roller screw structure 3, planetary nut 31, planetary roller 32, planetary screw rod 33, roller end plate 34, high magnetic magnet 4, force transmission nut 5, cylinder body front cover 6, cylinder body rear cover 7, magnet bearing 8, end bearing 9. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantage of the application more clear and obvious, the application is described and explained below in combination with the drawings and examples. It should be understood that the specific examples described here are only used to explain the application, and are not used to limit the application. Based on the examples provided in the application, all other examples obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.
[0024] It is apparent that the accompanying drawings described below in the description merely show some examples or embodiments of the present application, and the present application can be applied to other similar situations without creative labor by those skilled in the art according to the drawings. In addition, it can be understood that although the efforts made in the development process can be complex and lengthy, some modifications, such as design, manufacture or production, etc. based on the technical content disclosed in the present application, are only routine technical means for those skilled in the art related to the content disclosed in the present application, and should not be understood as insufficient disclosure of the content disclosed in the present application.
[0025] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments without conflict.
[0026] Unless otherwise defined, the technical terms or scientific terms involved in the present application should be understood as the usual meaning understood by those skilled in the art in the technical field to which the present application belongs. The terms "one", "a", "an", "the", and similar words involved in the present application do not represent quantity limitation, but can represent singular or plural. The terms "include", "contain", "have", and any variations thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or units (units) is not limited to the listed steps or units, but can also include steps or units not listed, or can also include other steps or units inherent to the process, method, product or device. The terms "connected", "connected", "coupled" and similar words involved in the present application are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The term "multiple" / "several" refers to two or more. The association between the associated objects described by "and / or" can represent three relationships, for example, "A and / or B" can represent three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The terms "first", "second", "third", etc. involved in the present application are merely to distinguish similar objects, and do not represent a specific order for the objects.
[0027] As Figures 1-2The utility model discloses a planetary screw rod movable type planetary roller screw electric cylinder, main structure includes electric cylinder body 1, frameless motor 2, planetary roller screw structure 3, high magnetic magnet 4, force transmission nut 5, cylinder front cover 6, cylinder rear cover 7, magnet bearing 8, end bearing 9.
[0028] Electric cylinder body 1 is annular, is fixed in electric cylinder body 1 through motor mounting bracket 21, can produce electromagnetic field when electrifying, and electromagnetic field can drive high magnetic magnet 4 rotation, high magnetic magnet 4 is annular magnet, is coaxially arranged with frameless motor 2, high magnetic magnet 4 is fixedly connected with force transmission nut 5, force transmission nut 5 is annular nut, is coaxially arranged with frameless motor 2, the inside of force transmission nut 5 is planetary roller screw structure 3, and electric cylinder body 1 is fixedly closed through cylinder front cover 6 and cylinder rear cover 7 at both ends, and the middle position of cylinder front cover 6 is provided with the front cover hole that planet screw rod 33 passes out. Cylinder front cover 6 and cylinder rear cover 7 are abutted with the front and rear ends of planetary roller screw structure 3 through end bearing 9, and end bearing 9 can make cylinder front cover 6 and cylinder rear cover 7 not affect the normal rotation of planetary roller screw structure 3. Magnet bearing 8 is arranged at the front and rear ends of high magnetic magnet 4 respectively, the outer rotor of magnet bearing 8 is fixedly connected with electric cylinder body 1, the inner rotor of magnet bearing 8 is fixedly connected with the end of high magnetic magnet 4, and the outer rotor and inner rotor of magnet bearing 8 are rotatablely cooperated through ball. Magnet bearing 8 is used for positioning high magnetic magnet 4, and does not hinder the normal rotation of high magnetic magnet 4.
[0029] The utility model discloses an improvement lies in the setting of planetary roller screw structure 3, and planetary roller screw structure 3 includes a planetary nut 31, 4-6 planetary rollers 32 and a planetary screw rod 33, the planetary screw rod 33 is located inside the ring body of planetary nut 31, the planetary screw rod 33 is coaxially arranged with planetary nut 31, the planetary rollers 32 are arranged in the gap between planetary nut 31 and planetary screw rod 33, the axis of planetary rollers 32 is parallel with the axis of planetary screw rod 33 and planetary nut 31, the surface of planetary rollers 32, the surface of planetary screw rod 33 and the inner surface of planetary nut 31 are all provided with threads, the thread rotation direction of the surface of planetary screw rod 33 and the inner surface of planetary nut 31 is opposite, the thread on the planetary rollers 32 is annular groove without rotation direction, and the thread pitch of each thread is equal.
[0030] In the utility model,
[0031] The thread of planetary rollers 32 is 1 head, the thread of planetary screw rod 33 is 3 heads, the thread of planetary nut 31 is 5 heads, and the planetary screw rod movable type planetary roller screw electric cylinder changes from Figure 1 To Figure 2When the state of the motor 2 is driven by the electromagnetic field, the high magnetic magnet 4 is rotated, the high magnetic magnet 4 drives the force nut 5 and the planetary nut 31 to rotate, the planetary nut 31 drives the planetary roller 32 to rotate around the planetary screw rod 33 and moves to the right, and the planetary screw rod 33 moves to the left, the planetary nut 31 is right-handed thread, the planetary screw rod 33 is left-handed thread, because the pitches of the planetary nut 31 and the planetary screw rod 33 are the same, but the number of heads is different, therefore, the speed of the planetary roller 32 moving to the right drives the planetary screw rod 33 to move to the right is faster than the speed of the planetary screw rod 33 moving to the left, so the overall distance of the electric cylinder pushing out = the moving distance of the planetary roller 32 relative to the planetary screw rod 33 - the moving distance of the planetary screw rod 33 to the left, that is, the electric cylinder pushing out distance. It can be seen that the electric cylinder pushing out distance is significantly reduced, therefore, the same motor torque, the electric cylinder can generate a large thrust, the axial displacement precision of the planetary screw rod 33 is high, and the planetary screw rod moving type planetary roller screw electric cylinder is very suitable for application in the EMB with high space requirements.
[0032] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical solutions described by the utility model calculation method implementation, and those skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect; as long as the calculation method needs are met, it is within the protection scope of the utility model.
Claims
1. A planetary ball screw electric cylinder for EMB, comprising a cylinder body (1), wherein a motor (2), a planetary ball screw structure (3), a high-magnetic magnet (4), and a force transmission nut (5) are installed inside the cylinder body (1), characterized in that: The planetary roller screw structure (3) includes a planetary nut (31), several planetary rollers (32), and a planetary screw (33). The planetary screw (33) is located inside the ring of the planetary nut (31) and is coaxial with the planetary nut (31). The planetary rollers (32) are arranged in the gap between the planetary nut (31) and the planetary screw (33). The axis of the planetary rollers (32) is parallel to the axis of the planetary screw (33) and the axis of the planetary nut (31). A high-magnetic magnet (4) and a force-transmitting nut (5) are fixed on the motor (2). Next, the force transmission nut (5) is fixedly connected to the planetary nut (31). When the motor (2) is powered on, it can generate an electromagnetic field. The electromagnetic field can drive the high magnetic magnet (4) to rotate. The high magnetic magnet (4) drives the force transmission nut (5) and the planetary nut (31) to rotate. The planetary roller (32) can roll circumferentially between the planetary screw (33) and the planetary nut (31) and move axially at the same time. The planetary roller (32), the planetary screw (33), and the inner surface of the planetary nut (31) are all provided with threads. The threads on the planetary screw (33) and the inner surface of the planetary nut (31) have opposite directions of rotation.
2. The planetary ball screw electric cylinder for EMB as described in claim 1, characterized in that: The threads on the planetary roller (32) are annular grooves without a direction of rotation.
3. The planetary ball screw electric cylinder for EMB as described in claim 2, characterized in that: The planetary roller screw structure (3) further includes two roller end plates (34), which are disposed in the cavity between the planetary screw (33) and the planetary nut (31). The two roller end plates (34) are located at both ends of the planetary roller (32), and each end of the planetary roller (32) is provided with a roller end head, which is rotatably mounted on the roller end plate (34).
4. A planetary ball screw electric cylinder for EMB as described in claim 3, characterized in that: The planetary rollers (32) are arranged in a ring with equal arc around the planetary lead screw (33).
5. A planetary ball screw electric cylinder for EMB as described in claim 4, characterized in that: The cylinder body (1) is equipped with a cylinder front cover (6) and a cylinder rear cover (7). The cylinder body (1) is a ring structure. The cylinder front cover (6) covers the opening at the front of the cylinder body (1), and the cylinder rear cover (7) covers the opening at the rear of the cylinder body (1). The cylinder front cover (6) has a front cover hole in the middle for the planetary screw (33) to pass through.
6. A planetary ball screw electric cylinder for EMB as described in claim 5, characterized in that: The cylinder body (1) of the electric cylinder is equipped with two magnetic bearings (8). The two magnetic bearings (8) are respectively located at the front and rear ends of the high magnetic magnet (4). The outer rotor of the magnetic bearing (8) is fixedly connected to the motor (2) or the cylinder body (1). The inner rotor of the magnetic bearing (8) is fixedly connected to the end of the high magnetic magnet (4). The outer rotor and the inner rotor of the magnetic bearing (8) are rotatably engaged by ball bearings.
7. A planetary ball screw electric cylinder for EMB as described in claim 6, characterized in that: The planetary nut (31) is rotatably connected to the cylinder front cover (6) and / or cylinder rear cover (7) via an end bearing (9).
8. A planetary ball screw electric cylinder for EMB as described in claim 7, characterized in that: The thread pitch of the planetary roller (32), the planetary screw (33), and the inner surface of the planetary nut (31) is equal.
9. A planetary ball screw electric cylinder for EMB as described in claim 1, characterized in that: The motor (2) is fixedly installed in the cylinder body (1) of the electric cylinder by means of the motor mounting bracket (21).
10. A planetary ball screw electric cylinder for EMB as described in claim 1, characterized in that: The motor (2) is a frameless motor.