A transmission structure directly driven by a torque motor

Abstract

The present invention discloses a transmission structure directly driven by a torque motor, comprising: a transmission rod, fixedly arranged; a transmission seat, sleeved on the transmission rod and in transmission cooperation with the transmission rod, the transmission cooperation being used for converting the rotational motion of the transmission seat into a linear motion along the axial direction of the transmission rod; and a motor, the rotor of the motor being sleeved outside the transmission rod and fixedly connected to the transmission seat. By the above method, the present invention can effectively avoid the vibration generated in the radial direction of the transmission rod during the transmission process.

Description

Technical Field

[0001] The present invention relates to the field of mechanical transmission, and particularly to a transmission structure directly driven by a torque motor. Background Art

[0002] Machine tools all include a feed system. The main function of the feed system is to drive a workbench to achieve linear feed through a ball screw pair under the drive of a servo motor. Therefore, the reliability of the feed system will directly affect the machining accuracy of the machine tool.

[0003] Currently, the feed system includes: a motor mechanism, a lead screw mechanism, and a nut seat. The motor mechanism is used to control the linear motion of the nut seat by driving the rotational motion of the lead screw mechanism, and the nut seat is used to mount the workbench. Among them, the lead screw mechanism includes a lead screw, and the motor mechanism includes: a torque motor rotor, a torque motor stator, and a motor base that are sleeved on the driving end of the lead screw in sequence from the inside to the outside. The torque motor rotor is connected to the lead screw through a shrink fit sleeve or rigidly connected by interference fit.

[0004] The straightness of the lead screw will be affected by the machining process and the force on the lead screw, resulting in the nut seat reciprocating radially during the rotation of the lead screw, thereby causing the workbench to vibrate. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a transmission structure directly driven by a torque motor, which can avoid vibration during the transmission process.

[0006] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a transmission structure directly driven by a torque motor, including:

[0007] A transmission rod, fixedly arranged;

[0008] A transmission seat, sleeved on the transmission rod and in transmission cooperation with the transmission rod, and the transmission cooperation is used to convert the rotational motion of the transmission seat into a linear motion along the axial direction of the transmission rod; and

[0009] A motor, the rotor of the motor is sleeved outside the transmission rod and fixedly connected to the transmission seat.

[0010] The beneficial effect of the present invention is: Different from the prior art, in the present invention, the transmission rod is fixed, and the rotor of the motor is in transmission cooperation with the transmission rod through the transmission seat, and the rotational motion of the motor is converted into a linear motion along the transmission rod. The straightness of the transmission rod will not affect the stability during the movement of the motor, effectively avoiding the vibration generated radially on the transmission rod during the transmission process. Brief Description of the Drawings

[0011] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of the transmission structure directly driven by a torque motor of the present application;

[0012] Figure 2 is Figure 1 the A-A cross-sectional view in

[0013] Figure 3 is Figure 1 the top view of

[0014] Figure 4 the schematic cross-sectional structure diagram of the stator sleeve in the drive structure directly driven by the torque motor of the present application;

[0015] Figure 5 the schematic cross-sectional structure diagram of the gland in the drive structure directly driven by the torque motor of the present application;

[0016] Figure 6 is the schematic cross-sectional structure diagram of the bearing sleeve in the drive structure directly driven by the torque motor of the application.

[0017] In the figure:

[0018] 1. Base;

[0019] 2. Transmission rod;

[0020] 3. Transmission seat;

[0021] 4. Motor, 9. Stator sleeve, 901. First cavity, 902. First mounting plane, 903. Second cavity, 10. First bearing, 11. Stator, 1101. First end face, 1102. Second end face, 12. Rotor, 13. Gland, 1301. Second mounting plane, 14. Second bearing, 15. Bearing sleeve, 1501. Main body part, 1502. Limiting part;

[0022] 5. Moving part;

[0023] 6. Guide assembly, 7. Guide rail, 8. Slide block. Detailed implementation manners

[0024] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be specifically noted that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only partial embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0025] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] As Figure 1 and Figure 2 As shown, an embodiment of the transmission structure directly driven by a torque motor of this application includes: a base 1, a transmission rod 2, a transmission seat 3, a motor 4, and a moving part 5.

[0027] The base 1 can be a separate component, which is fixedly installed on the machine tool main body during use, or can be a part of the machine tool main body.

[0028] The transmission rod 2 is in the shape of a long rod and is fixedly arranged on the base 1. In this embodiment, both ends of the transmission rod 2 are fixed on the base 1, and the middle part is used for transmission. In other embodiments, the transmission rod 2 can also be fixed on the base 1 through other parts, as long as there is enough length for transmission.

[0029] The transmission seat 3 is sleeved on the transmission rod 2 and is in transmission cooperation with the transmission rod 2. The transmission cooperation is used to convert the rotational motion of the transmission seat 3 into a linear motion along the axial direction of the transmission rod 2.

[0030] The rotor of the motor 4 is sleeved outside the transmission rod 2 and is fixedly connected to the transmission seat 3. The rotor drives the transmission seat 3 to rotate. The motor 4 is a device that converts electrical energy into mechanical energy. It uses the stator to generate a rotating magnetic field and acts on the rotor to form a rotating torque to drive the rotor to rotate. The motor 4 in this embodiment is slightly different from the motors sold on the market. For the convenience of outputting the rotating torque, a rotating shaft exposed outside the motor housing is provided on the rotor of the commercially available motor, and the rotating shaft is used to connect with the object to be driven. The rotor of the motor 4 in this embodiment is directly fixedly connected to the transmission seat 3, so a rotating shaft is not required. In addition, the rotor is directly connected to the transmission seat 3, and the rotating torque is directly transmitted to the transmission seat 3, omitting the intermediate transmission structure and also reducing the assembly deviation.

[0031] The moving part 5 is installed on the motor 4 and moves along the transmission rod 2 under the drive of the motor 4. The moving part 5 can be a workbench of the machine tool and is used to carry the articles to be processed.

[0032] Specifically, the motor 4 can be a torque motor. A torque motor is a special type of motor with a relatively large number of poles. It can continue to operate even when the motor runs at a low speed or is blocked (i.e., the rotor cannot rotate), without causing damage to the motor. The motor can provide a stable torque to the load. The torque motor can also provide a torque in the opposite direction to the rotation direction (braking torque). The torque motor has a small moment of inertia and can exert its maximum performance. In addition, the torque motor has a large driving force and can be used under heavy load conditions.

[0033] Specifically, the transmission rod 2 and the transmission seat 3 can form a ball screw pair. A ball screw pair is a screw transmission element with steel balls as rolling elements between the screw and the nut. It can convert rotational motion into linear motion and is a transmission device with relatively high precision and commonly used in transmission machinery. The ball screw pair is a prior art and will not be elaborated here. Since it is a prior art, it can be directly purchased from the market and then assembled with the motor 4, which can reduce the manufacturing cost of the direct drive transmission structure of the torque motor in this application. In addition, in other embodiments, on the premise of meeting the transmission accuracy, the transmission rod 2 and the transmission seat 3 can also adopt other structural forms. For example, the transmission rod 2 is a screw rod and the transmission seat 3 is threadedly connected to the transmission rod 2.

[0034] As Figure 2 and Figure 3 shown, the direct drive transmission structure of the torque motor in this embodiment can further include: a guiding component 6. The guiding component 6 is connected to the motor 4 and is used to guide the axial movement of the motor 4 on the transmission rod 2. The setting of the guiding component 6 can enhance the stability of the motor 4 and prevent the base part of the motor 4 from rotating relative to the transmission rod 2.

[0035] Specifically, two guiding components 6 can be provided, which are arranged at intervals with the transmission rod 2 and are located on both sides of the transmission rod 2. By setting it in this way, the motor 4 is more balanced in force and can ensure that the motor 4 is more stable.

[0036] Specifically, the guiding component 6 can include: a guide rail 7 and a slider 8. The guide rail 7 is fixedly arranged on the base 1, and its extending direction is consistent with the axial direction of the transmission rod 2. The slider 8 is clamped on the guide rail 7 and reciprocally slides along the extending direction of the guide rail 7. The slider 8 is fixedly connected to the motor 4, and the slider 8 can be fixed to the moving part 5.

[0037] Furthermore, the guide rail 7 and the slider 8 form a linear guide rail. The linear guide rail is used for linear reciprocating motion occasions and can bear a certain torque, and can achieve high-precision linear motion under high load conditions. The linear guide rail is a prior art and will not be elaborated here.

[0038] The specific structure of the above guiding component 6 is only an optional solution, and this application is not limited thereto. Other structures can also be adopted in other embodiments.

[0039] As Figure 1 、 Figure 4 and Figure 5 shown, the motor 4 of this embodiment may include: a stator sleeve 9, a first bearing 10, a stator 11, a rotor 12, and a gland 13.

[0040] Among them, the stator sleeve 9 is in a sleeve shape, and its inner wall extends radially outward to form a first cavity 901, and a first mounting plane 902 perpendicular to the axis of the stator sleeve 9 is formed. The inner wall of the first cavity 901 extends radially outward along the stator sleeve 9 to form a second cavity 903. The first bearing 10 is sleeved in the first cavity 901, and the outer ring of the first bearing 10 abuts against the first mounting plane 902. The stator 11 is sleeved in the second cavity 903. The stator 11 has a first end face 1101 and a second end face 1102 in the axial direction. The first end face 1101 abuts against the outer ring of the first bearing 10. The rotor 12 is sleeved in the stator 11 and has a gap with the stator 11. The rotor 12 is coaxially arranged with the first bearing 10 and is detachably fixedly connected to the inner ring of the first bearing 10. The gland 13 is fixed to the stator sleeve 9 and is provided with a second mounting plane 1301 perpendicular to the axis of the stator sleeve 9. The second mounting plane 1301 abuts against the second end face 1102.

[0041] In the above-mentioned motor 4, the outer ring of the first bearing 10 and the stator 11 are clamped by the first mounting plane 902 and the second mounting plane 1301, so as to be fixed.

[0042] The assembly process of the above-mentioned motor 4 includes the following steps:

[0043] Put the first bearing 10 into the first cavity 901 and make the outer ring of the first bearing 10 abut against the first mounting plane 902;

[0044] Put the stator 11 into the second cavity 903 and make the first end face 1101 abut against the outer ring of the first bearing 10;

[0045] Put the rotor 12 into the cavity of the stator 11 and fixedly connect the inner ring of the first bearing 10 with the rotor 12;

[0046] Fix the gland 13 to the stator sleeve 9 and make the second mounting plane 1301 press the second end face 1102, and generate a force (locking force) on the second end face 1102 in the direction perpendicular to the second mounting plane 1301.

[0047] It can be seen from the structure and assembly steps of the above-mentioned motor 4 that the structure of the motor 4 is compact and the assembly is convenient.

[0048] In the structure of the above motor 4 , in order to better clamp the first bearing 10 , the axial depth of the first cavity 901 in the stator sleeve 9 should be smaller than the thickness of the first bearing 10 .

[0049] The structure of the above motor 4 is to limit and clamp the first bearing 10 and the stator 11 in the axial direction of the stator sleeve 9 to achieve the purpose of fixing. In order to better fix the first bearing 10 and the stator 11, the first bearing 10 and the stator 11 can be further limited in the radial direction of the stator sleeve 9. Specifically, the first cavity 901 and the second cavity 903 match the shape and size of the first bearing 10 and the stator 11 respectively.

[0050] In order to balance the force on the rotor 12, the motor 4 may further include: a second bearing 14. The second bearing 14 is sleeved in the second cavity 903 and is coaxially arranged with the first bearing 10. The outer ring of the second bearing 14 is sandwiched between the second mounting plane 902 and the second end face 1102, and the inner ring of the second bearing 14 is detachably fixedly connected to the rotor 12. After the second bearing 14 is added, the structure of the motor 4 is still compact and easy to assemble.

[0051] To facilitate fixing the rotor 12, the inner ring of the first bearing 10 and / or the second bearing 14 may be detachably fixedly connected to the rotor 12 via a bearing sleeve 15. Here, "and / or" means that the inner ring of the first bearing 10 may be detachably fixedly connected to the rotor 12 via the bearing sleeve 15, or the inner ring of the second bearing 14 may be detachably fixedly connected to the rotor 12 via the bearing sleeve 15, or the inner rings of the first bearing 10 and the second bearing 14 may be detachably fixedly connected to the rotor 12 via the bearing sleeve 15. The first bearing 10 and the second bearing 14 correspond to two bearing sleeves 15, respectively.

[0052] like Figure 1 and Figure 6 As shown, the first bearing 10 is taken as an example below to introduce the specific fixing structure of the inner ring of the first bearing 10 and the rotor 12. The second bearing 14 can refer to the first bearing 10.

[0053] The bearing sleeve 15 includes: a main body 1501 and a limiting portion 1502. The main body 1501 is cylindrical, and the limiting portion 1502 is formed by radially extending outward from the edge of one end. The main body 1501 matches the inner ring of the first bearing 10 and is sleeved inside the inner ring. The main body 1501 is detachably fixedly connected to the rotor 12. The inner ring of the first bearing 10 is clamped between the rotor 12 and the limiting portion 1502 and is subjected to a clamping force.

[0054] The first bearing 10 and the second bearing 14 may be a single bearing or a coaxially arranged bearing group.

[0055] To facilitate the disassembly and assembly of the motor 4, the gland 13 can be detachably connected to the stator sleeve 9.

[0056] Specifically, the gland 13 can be threadedly connected to the stator sleeve 9 so that the second mounting plane 1301 on the gland 13 can better provide a locking force. Of course, the connection manner between the gland 13 and the stator sleeve 9 is not limited to this, and other detachable connection manners are also possible.

[0057] In this embodiment, the rotor of the motor 4 is in transmission cooperation with the transmission rod 2 through the transmission seat 3. After the motor 4 is powered on, the rotational motion of the rotor is converted into a linear motion along the transmission rod 2. The straightness of the transmission rod 2 will not affect the stability of the motor 4 during the movement, effectively avoiding vibration during the transmission process. In addition, in this embodiment, the transmission rod 2 is fixedly arranged, and the rotor of the motor 4 can rotate at a relatively high speed, which can increase the linear movement speed of the motor 4 (the moving part 5).

[0058] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A transmission structure directly driven by a torque motor, characterized in that, it includes: a base; a transmission rod, fixedly arranged on the base; a transmission seat, sleeved on the transmission rod and in transmission cooperation with the transmission rod, and the transmission cooperation is used to convert the rotational motion of the transmission seat into a linear motion along the axial direction of the transmission rod; and a motor, the rotor of the motor is sleeved outside the transmission rod and fixedly connected to the transmission seat; wherein, the motor includes: a sleeve-shaped stator sleeve, and a first mounting plane perpendicular to the axis of the stator sleeve is arranged on the inner wall of the stator sleeve; a first bearing, sleeved in the stator sleeve, and the outer ring of the first bearing abuts on the first mounting plane; a stator, sleeved in the stator sleeve, the stator has a first end face and a second end face in the axial direction, and the first end face abuts on the outer ring of the first bearing; the rotor, sleeved in the stator and having a gap with the stator, the rotor is coaxially arranged with the first bearing, and is detachably fixedly connected to the inner ring of the first bearing; and a gland, fixed on the stator sleeve, provided with a second mounting plane perpendicular to the axis of the stator sleeve, and the second mounting plane abuts on the second end face.

2. The transmission structure directly driven by a torque motor according to claim 1, characterized in that, the motor is a torque motor.

3. The transmission structure directly driven by a torque motor according to claim 1, characterized in that, the transmission rod and the transmission seat form a ball screw pair.

4. The transmission structure directly driven by a torque motor according to claim 1, characterized in that, it further includes: a guiding assembly, connected to the motor, and used to guide the motor to move axially on the transmission rod.

5. The transmission structure directly driven by a torque motor according to claim 4, characterized in that, the guiding assembly includes: a guide rail and a slider, the guide rail is fixedly arranged, and the extending direction is consistent with the axial direction of the transmission rod, the slider is clamped on the guide rail and reciprocally slides along the extending direction of the guide rail, and the slider is fixedly connected to the motor.

6. The transmission structure directly driven by a torque motor according to claim 5, characterized in that, the guide rail and the slider form a linear guide rail.

7. The transmission structure directly driven by a torque motor according to claim 1, characterized in that, the motor further includes: a second bearing, sleeved in the stator sleeve and coaxially arranged with the first bearing, the outer ring of the second bearing is clamped between the second mounting plane and the second end face, and the inner ring of the second bearing is detachably fixedly connected to the rotor.

8. The transmission structure directly driven by a torque motor according to claim 7, characterized in that, the inner ring of the first bearing and / or the second bearing is detachably fixedly connected to the rotor through a bearing sleeve.

9. The transmission structure directly driven by a torque motor according to claim 8, characterized in that, the gland is detachably connected to the stator sleeve.

Images