Miniature transmission lead screw driving connecting device

Abstract

A miniature transmission lead screw driving connecting device belongs to the field of mechanical transmission and comprises a transmission lead screw, a supporting connecting rod, a bearing pack, a bearing seat, a positioning sleeve, a transmission pin shaft, a driving motor and the like. The transmission screw rod is matched and connected with the support connecting rod; the two locking jackscrews and the supporting connecting rod are installed in a matched mode. The bearing pack is in bearing fit connection with the supporting connecting rod; the transmission screw rod, the support connecting rod and the mounting assembly of the bearing pack are connected with the inner hole of the bearing seat; the positioning sleeve is matched and connected with the positioning sleeve of the support connecting rod; the transmission pin shaft is matched and connected with an output shaft of the micro motor; the driving motor and the bearing seat are installed in a matched mode and connected in a fastened mode. According to the device, the strength and rigidity of the supporting part of the micro transmission lead screw are effectively improved, so that the connection mode of the driving stepping motor and the transmission part is convenient and reliable, the convenience of mounting and dismounting is improved, and the device plays a very important role in high transmission precision, high rigidity and high efficiency of the micro transmission lead screw.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical transmission, and relates to a connecting device, in particular to a micro transmission screw driven connecting device. Background Art

[0002] As we all know, drive screws are important components in mechanical transmission and play a vital role in machining. They convert rotational motion into linear motion or torque into repetitive axial force. Micro drive screws generally refer to those with a diameter of less than 20 mm and a length of less than 300 mm. These micro drive screws are primarily used for internal driving of micro-feed mechanisms, such as the telescopic mechanisms of high-precision machining tools, the expansion mechanisms of precision honing tools, and the internal drive mechanisms of electronic equipment and instruments. They are characterized by high precision, fast response, low friction, high rigidity, and high efficiency. However, the quality of the drive screw's support connection directly determines whether it can achieve these characteristics of high precision, high rigidity, and high efficiency.

[0003] For ordinary transmission screws in the prior art, it is often adopted to directly use the optical axis and bearing assemblies at both ends of the screw for matching installation, and drive through the support connection form of the external bearing seat and the coupling, so as to achieve higher transmission accuracy and rigidity, and meet the transmission requirements of fast response, low friction and high efficiency. However, for micro transmission screws, due to their small size, the design and layout of the support connection form have brought certain difficulties. At the same time, the miniaturization of the support bearings also has a significant impact on the rigidity and transmission accuracy of its overall structure. Conventional support connection forms have made it difficult to solve the structural rigidity and high precision problems of micro transmission screws, which has a great impact on the service life of the micro transmission screws. Some micro transmission screws directly adopt an integrated structure of support connection and screw drive, which complicates the structure of the micro transmission screw and also brings higher costs to manufacturing, repair, maintenance and replacement.

[0004] Based on the above reasons, it is absolutely necessary to provide a micro transmission screw drive connection device with compact structure, reasonable layout and high reliability. Utility Model Content

[0005] The purpose of the utility model is to provide a micro transmission screw drive connection device with compact structure, reasonable layout and high reliability, so as to solve the problems of structural rigidity, transmission strength and precision of the transmission screw connection drive inside the micro feed mechanism.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a micro transmission screw drive connection device, comprising: a transmission screw, a support connecting rod, an anti-loosening locking nut, a locking nut, a stop screw, a bearing group, a bearing seat, a positioning sleeve, a transmission pin, and a driving motor; the transmission screw and the support connecting rod are connected through the shaft hole, and the circumferential positioning is performed by the positioning key of the polished rod part on the transmission screw; the two stop screws are installed in conjunction with the two screw thread holes on the support connecting rod, and the screw semicircular holes on the transmission screw are pressed through the screw thread holes to limit the axial direction of the transmission screw; the support connecting rod and the bearing of the bearing group are connected through the support The connecting rod shoulder is used for axial positioning, and the bearing is pre-tightened and positioned by screwing the anti-loosening locking nut on the thread on the supporting connecting rod; the transmission screw, supporting connecting rod, and the mounting assembly of the bearing group are matched and connected with the inner hole of the bearing seat, and the locking nut is screwed into the bearing seat to tighten and limit the outer ring of the bearing group; the positioning sleeve is a circular sleeve, and the positioning sleeve and the supporting connecting rod are matched and connected, and the axial positioning is performed by the shoulder of the supporting connecting rod; the transmission pin shaft and the output shaft of the drive motor are matched and connected, and the inner ring of the positioning sleeve limits the two ends of the transmission pin shaft; the drive motor and the bearing seat are matched and installed, and the drive motor and the bearing seat are fastened together by four bolts.

[0007] The transmission screw comprises a nut, a screw part and a polished rod part; a hemispherical stop positioning groove is arranged on the polished rod part, and a positioning key is arranged at the front part.

[0008] The supporting connecting rod is in the shape of a stepped cylinder, and a locking nut thread, a transmission screw stop threaded hole, a bearing mounting portion, a shaft shoulder, a positioning sleeve mating surface, and a motor drive shaft connecting section are sequentially provided on its exterior; a transmission screw connecting hole, a positioning keyway, a motor drive shaft mounting hole, and a motor drive shaft connecting groove are sequentially provided on its interior.

[0009] The bearing seat includes: a bearing seat mounting portion and a first connecting flange; a locking nut threaded hole, a bearing cavity, and a drive connecting cavity are sequentially arranged inside the bearing seat mounting portion; a stop hole, a flange connecting hole, and a connecting threaded hole are arranged on the first connecting flange; the bearing seat mounting portion and the first connecting flange are integrated.

[0010] The driving motor comprises: a driving connecting shaft, a positioning stop, a second connecting flange, and a motor body; the driving connecting shaft, the positioning stop, the second connecting flange, and the motor body are installed in sequence from the inside to the outside.

[0011] The beneficial effects achieved by the utility model after adopting the above technical solution are: the utility model has a compact structure, a reasonable layout, and high reliability. Compared with the traditional drive connection method in which the transmission screw is directly connected to the miniature bearing and the miniature coupling, the utility model has great advantages. The added connection device effectively improves the strength and rigidity of the supporting part of the miniature transmission screw. The connection method between the drive motor and the transmission part is convenient and reliable, which improves the convenience of installation and disassembly. It is suitable for the drive connection and installation of the miniature transmission screw device, plays an important role in the high precision, high rigidity and high efficiency of the transmission of the miniature transmission screw, and improves the service life of the miniature transmission screw transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a micro transmission screw drive connection device of the utility model;

[0013] Figure 2 This is a schematic diagram of the support connecting rod structure of a micro transmission screw drive connecting device of the utility model.

[0014] Figure: 1. Drive screw, 2. Support connecting rod, 3. Anti-loosening locking nut, 4. Locking nut, 5. Stop screw, 6. Bearing assembly, 7. Bearing seat, 8. Locating sleeve, 9. Drive pin, 10. Drive motor; 1.1. Nut, 1.2. Screw portion, 1.3. Polished rod portion, 1.4. Hemispherical stop and positioning groove, 1.5. Locating key; 2.1. Locking nut thread, 2.2. Bearing mounting portion, 2.3. Drive screw stop threaded hole, 2.4. Shaft shoulder, 2.5. Locating sleeve mating surface, 2.6. Motor drive connecting section, 2.7. Motor drive shaft connecting groove, 2.8. Motor drive shaft mounting hole, 2.9. Drive screw connecting hole, 2.10. Locating keyway; 7.1. Bearing seat mounting portion, 7.2. First connecting flange, 7.3. Locking nut threaded hole, 7.4. Bearing cavity, 7.5. Drive connection cavity, 7.6. Stop hole, 7.7. Flange connection hole, 7.8. Connection threaded hole; 10.1. Drive connection shaft, 10.2. Positioning stop, 10.3. Second connection flange, 10.4. Motor body. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation methods.

[0016] like Figure 1-2 Shown: A micro transmission screw drive connection device, including: a transmission screw 1, a supporting connecting rod 2, an anti-loosening locking nut 3, a locking nut 4, a stop screw 5, a bearing group 6, a bearing seat 7, a positioning sleeve 8, a transmission pin 9, and a driving motor 10.

[0017] The transmission screw 1 includes a nut 1.1, a screw part 1.2, a polished rod part 1.3, a hemispherical stop positioning groove 1.4, and a positioning key 1.5; the support connecting rod 2 includes a locking nut thread 2.1, a bearing mounting part 2.2, a transmission screw stop threaded hole 2.3, a shaft shoulder 2.4, a positioning sleeve mating surface 2.5, a motor drive shaft connecting section 2.6, a motor drive shaft connecting groove 2.7, a motor drive shaft mounting hole 2.8, a transmission screw connecting hole 2.9, and a positioning key groove 2.10; the bearing seat 7 includes: a bearing seat mounting part 7.1, a first connecting flange 7.2, a locking nut threaded hole 7.3, a bearing cavity 7.4, a drive connecting cavity 7.5, a stop hole 7.6, a flange connecting hole 7.7, and a connecting threaded hole 7.8; the drive motor 10 includes: a drive connecting shaft 10.1, a positioning stop 10.2, a second connecting flange 10.3, and a motor body 10.4.

[0018] In this embodiment, the polished rod portion 1.3 of the transmission screw 1 is inserted into the transmission screw connection hole 2.9 of the support connecting rod 2, so that the positioning key 1.5 of the transmission screw 1 and the positioning key groove 2.10 of the support connecting rod 2 form a key positioning, limiting the circumferential relative rotation of the transmission screw 1 and the support connecting rod 2; the polished rod portion 1.3 and the transmission screw connection hole 2.9 adopt a transition fit or a small interference fit to improve the reliability of its transmission connection and at the same time ensure the coaxiality accuracy requirements after its connection. After installation, it is installed in the transmission screw stop threaded hole 2.3 of the support connecting rod 2 through two stop screws 5. Double screws or screw thread glue can be used to prevent it from loosening. The hemispherical stop positioning groove 1.4 on the transmission screw 1 is pressed to perform high-reliability axial limitation on the transmission screw 1 in the circumferential direction, so that the transmission screw 1 and the support connecting rod 2 form a special support form of a combination dedicated transmission screw component.

[0019] The bearing group 6 and the bearing mounting section 2.2 of the supporting connecting rod 2 are cooperatively connected. One axial side of the inner ring of the bearing group 6 is positioned by the shaft shoulder 2.4, and the other side is pre-tightened by the anti-loosening locking nut 3 that is screwed into the locking nut thread 2.1 of the supporting connecting rod 2; the installation combined transmission component of the transmission screw 1, the supporting connecting rod 2, and the bearing group 6 is connected and coordinated with the bearing cavity 7.4 of the bearing seat 7, and the locking nut 4 is screwed into the locking nut threaded hole 7.3 of the bearing seat 7 to press and limit the outer ring of the bearing group 6, so that the installation combined transmission component of the transmission screw 1, the supporting connecting rod 2, and the bearing group 6 and the bearing seat 7 form a high-rigidity precision transmission component.

[0020] The transmission pin shaft 9 and the pin shaft hole on the drive connecting shaft 10.1 of the drive motor 10 are matched and connected, and the reliability of the connection transmission can be improved through the transition fit. The assembly is inserted into the motor drive shaft mounting hole 2.8 and the motor drive shaft connecting groove 2.7 on the motor drive connecting section 2.6 of the support connecting rod 2. The drive connecting shaft 10.1 of the drive motor 10 forms a certain clearance fit with the motor drive shaft mounting hole 2.8 on the motor drive connecting section 2.6, eliminating the influence of coaxiality when transmitting torque between the two. The transmission pin 9 forms a clearance-free fit with the motor drive shaft connecting groove 2.7 on the motor drive section 2.6, which can eliminate the transmission gap between the two when rotating and transmitting torque; the positioning sleeve 8 is annular, and the positioning sleeve 8 is matched and connected with the positioning sleeve matching surface 2.5 of the support connecting rod 2, and axial positioning is performed by the shaft shoulder 2.4 of the support connecting rod 2; the inner ring of the positioning sleeve 8 safely positions the two ends of the transmission pin shaft 9, ensuring that the transmission pin shaft 9 can be completely matched and connected with the motor drive shaft connecting groove 2.7 when the drive mechanism rotates, and is safely and stably driven to rotate together with the drive mechanism.

[0021] The positioning stop 10.2 of the drive motor 10 and the motor stop hole 7.6 of the bearing seat 7 are installed in coordination, and the second connecting flange 10.3 on the drive motor 10 and the first connecting flange 7.2 of the bearing seat 7 are combined with the joint surface, and are fastened together by four bolts and mounting threaded holes 7.8, thereby forming a complete micro transmission screw drive feed unit. The micro transmission screw drive connection device can be matched with the equipment body used through the outer circle of the bearing seat mounting part 7.1 of the bearing seat 7, and is fastened together with the equipment body through the four flange connection holes 7.7 on the first connecting flange 7.2.

[0022] In this embodiment, the transmission screw 1 of the device is a standard ordinary screw, consisting of a nut 1.1, a screw portion 1.2, and a polished rod portion 1.3. The screw portion 1.2 and polished rod portion 1.3 are integrally formed. A hemispherical retaining groove 1.4 and a positioning key 1.5 are provided at the front of the polished rod portion 1.3, corresponding to the position of the transmission screw retaining threaded hole 2.3 and the positioning key groove 2.10 supporting the connecting rod 2. Reciprocating feed motion is achieved by connecting the nut 1.1 to the working component.

[0023] In this embodiment, the supporting connecting rod 2 of the device is in the shape of a stepped cylinder, with a locking nut thread 2.1, a bearing mounting section 2.2, a shaft shoulder 2.4, a positioning sleeve mating surface 2.5, and a motor connecting section 2.6 provided on the outside; a transmission screw connecting hole 2.9, a positioning keyway 2.10, a motor drive shaft mounting hole 2.8, and a motor drive shaft connecting groove 2.7 provided on the inside in that order; and two symmetrical transmission screw stop threaded holes 2.3 provided on the bearing mounting section 2.2.

[0024] The first connecting flange 7.2 of the bearing seat 7 of the device is not limited to a square, and the shape of the bearing seat mounting portion 7.1 of the bearing seat 7 is not limited to a cylindrical surface. The position and number of the connecting threaded holes 7.8 and flange connecting holes 7.7 provided on the first connecting flange 7.2 are not limited to the above, and are mainly set according to the structure of the equipment used. The interior is provided with a bearing cavity 7.4, a locking nut threaded hole 7.3, a drive connecting cavity 7.5, and a stop hole 7.6 according to the shape and size requirements of the supporting connecting component.

[0025] This micro transmission screw drive connection device has a compact structure, reasonable layout, high reliability, and quick and convenient installation and disassembly. It is very suitable for the drive connection installation of micro transmission screw devices, effectively meeting the performance requirements of high precision, high rigidity and high efficiency of micro transmission screw transmission, and plays an important role in improving the service life of micro transmission screw transmission devices.

[0026] Practical applications are not limited to the situations described in this embodiment, and all technical solutions and improvements that do not deviate from the essential content of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A micro transmission screw drive connection device, comprising: A transmission screw (1), a support connecting rod (2), a locking nut (3), a locking nut (4), a stop screw (5), a bearing group (6), a bearing seat (7), a positioning sleeve (8), a transmission pin (9), and a drive motor (10); characterized in that: the transmission screw (1) and the support connecting rod (2) are connected in a matching manner through a shaft hole, and circumferential positioning is performed by a positioning key (1.5) on the polished rod portion (1.3) of the transmission screw (1); two stop screws (5) are matched with two screw thread holes on the support connecting rod (2) for installation, and the screw semicircular hole on the transmission screw (1) is pressed through the screw thread hole to limit the axial direction of the transmission screw (1); the bearings of the support connecting rod (2) and the bearing group (6) are matched and connected, and axial positioning is performed by a shaft shoulder (2.4) of the support connecting rod (2), and the screw is fixed in a fixed manner by a positioning key (1.5) on the polished rod portion (1.3) of the transmission screw (1). The anti-loosening locking nut (3) is screwed into the thread on the supporting connecting rod (2) to pre-tighten the bearing; the transmission screw (1), the supporting connecting rod (2), the mounting assembly of the bearing group (6) and the inner hole of the bearing seat (7) are matched and connected, and the locking nut (4) is screwed into the bearing seat (7) to press and limit the outer ring of the bearing group (6); the positioning sleeve (8) is a circular sleeve, and the positioning sleeve (8) and the supporting connecting rod (2) are matched and connected, and axial positioning is performed through the shaft shoulder (2.4) of the supporting connecting rod (2); the transmission pin shaft (9) and the output shaft of the driving motor (10) are matched and connected, and the inner ring of the positioning sleeve (8) limits the two ends of the transmission pin shaft (9); the driving motor (10) and the bearing seat (7) are matched and installed, and the driving motor (10) and the bearing seat (7) are fastened together by four bolts.

2. A micro transmission screw drive connection device according to claim 1, characterized in that: The transmission screw rod (1) comprises a nut (1.1), a screw rod portion (1.2), and a polished rod portion (1.3); a hemispherical stop positioning groove (1.4) is provided on the polished rod portion (1.3), and a positioning key (1.5) is provided at the front.

3. The micro transmission screw drive connection device according to claim 1, characterized in that: The supporting connecting rod (2) is in the shape of a stepped cylinder, and is provided with a locking nut thread (2.1), a transmission screw stop threaded hole (2.3), a bearing mounting portion (2.2), a shaft shoulder (2.4), a positioning sleeve matching surface (2.5), and a motor drive shaft connecting section (2.6) on its exterior in sequence; and a transmission screw connecting hole (2.9), a positioning keyway (2.10), a motor drive shaft mounting hole (2.8), and a motor drive shaft connecting groove (2.7) on its interior in sequence.

4. The micro transmission screw drive connection device according to claim 1, characterized in that: The bearing seat (7) comprises: a bearing seat mounting portion (7.1) and a first connecting flange (7.2); a locking nut threaded hole (7.3), a bearing cavity (7.4), and a drive connecting cavity (7.5) are sequentially arranged inside the bearing seat mounting portion (7.1); a stop hole (7.6), a flange connecting hole (7.7), and a connecting threaded hole (7.8) are arranged on the first connecting flange (7.2); the bearing seat mounting portion (7.1) and the first connecting flange (7.2) are integrated.

5. The micro transmission screw drive connection device according to claim 1, characterized in that: The drive motor (10) comprises: a drive connecting shaft (10.1), a positioning stop (10.2), a second connecting flange (10.3), and a motor body (10.4); the drive connecting shaft (10.1), the positioning stop (10.2), the second connecting flange (10.3), and the motor body (10.4) are installed in sequence from the inside to the outside.

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