CN215980683U

CN215980683U - Compact electric push rod

Info

Publication number: CN215980683U
Application number: CN202120561047.0U
Authority: CN
Inventors: 徐维; 邓攀; 夏占; 王玉柱; 王永爽
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2022-03-08
Anticipated expiration: 2031-03-17

Abstract

The utility model relates to a compact electric push rod.A servo motor is connected with a cylinder body assembly through a reduction box body, and the output end of the cylinder body assembly and the main body axis of the cylinder body assembly are arranged in a non-coaxial parallel manner; the cylinder body assembly comprises a lead screw, a left bearing assembly, a nut assembly, a right bearing assembly, a cylinder body and an ear piece assembly, and the bottom planes of the bearing seats of the left bearing assembly and the right bearing assembly are coplanar and serve as a whole machine mounting plane; the left end face and the right end face of the cylinder body are respectively connected to the right end face and the left end face of the left bearing assembly and the right bearing assembly; the optical axis parts of the left end and the right end of the screw rod are respectively connected with the bearings of the left bearing assembly and the right bearing assembly, and the nut assembly is arranged on the screw rod shaft to form a screw transmission pair; the lug piece assembly forms a sliding pair with the cylinder body sliding groove through the guide piece, the lug piece assembly is fixedly connected with the nut assembly, a bearing inner hole of the lug piece assembly is an output end and runs back and forth along the sliding groove in the cylinder body, and the installation space and the working space of the electric push rod are overlapped.

Description

Compact electric push rod

Technical Field

The utility model relates to an electric push rod, in particular to an electric push rod which has limited installation and working space and needs compact structure and space.

Background

At present, in each main engineering field, the working conditions of pushing, pulling and lifting are related, and generally, hydraulic oil cylinders or electric push rods are adopted for operation. The related technology of the hydraulic oil cylinder is mature and reliable, and the hydraulic oil cylinder has the advantages of stable load, reliable technology, lower cost and the like and is widely applied. However, the hydraulic cylinder technology has certain application disadvantages, such as low control precision, complex composition, huge structure, high noise, leakage and the like, and the use of the hydraulic cylinder technology is limited in occasions with higher related requirements.

In contrast, the electric push rod has the advantages of high control precision, simple structure, low noise, reliable operation, etc., and thus is increasingly used in place of the hydraulic cylinder.

The conventional electric push rod is generally in a linear coaxial push-pull structure, i.e., the push rod and a pushed object are in a coaxial 'line-shaped arrangement' structure, as shown in fig. 1.

Although the electric push rod with the structure is mature and reliable in application, the output end and the electric push rod are arranged in series, so that the occupied space is large, and the electric push rod is greatly limited in occasions with limited installation sizes.

Disclosure of Invention

In order to overcome the problems, the utility model provides a compact electric push rod, the installation space of the electric push rod is partially overlapped with the working space, the problem that the existing electric push rod needs a larger space when being installed and used can be solved, and the structure is simple.

In order to achieve the purpose, the utility model adopts the technical scheme that: a compact electric push rod comprises a servo motor, a speed reducer, a speed reducing box body and a cylinder body assembly, wherein the output end of the servo motor is connected with the input end of the speed reducer, the output end of the speed reducer is connected with the input end of the speed reducing box body, the output end of the speed reducing box body is connected with the input end of the cylinder body assembly, and the output end of the cylinder body assembly and the main body axis of the cylinder body assembly are arranged in a non-coaxial parallel mode; the cylinder body assembly comprises a lead screw, a left bearing assembly, a nut assembly, a right bearing assembly, a cylinder body and an ear piece assembly, and the bottom planes of the bearing seats of the left bearing assembly and the right bearing assembly are coplanar and serve as a whole machine mounting plane; the left end face and the right end face of the cylinder body are respectively connected to the right end face and the left end face of the left bearing assembly and the right bearing assembly; the optical axis parts of the left end and the right end of the screw rod are respectively connected with the bearings of the left bearing assembly and the right bearing assembly, and the nut assembly is arranged on the screw rod shaft to form a screw transmission pair; the lug piece assembly forms a sliding pair with the cylinder body sliding groove through the guide piece, the lug piece assembly is fixedly connected with the nut assembly, the bearing inner hole of the lug piece assembly is an output end and runs back and forth along the sliding groove in the cylinder body, and the installation space and the working space of the electric push rod are overlapped.

Furthermore, the nut assembly comprises a left flange, a left wear-resisting ring, a nut sleeve, a right wear-resisting ring and a right flange, and after the left end of the nut is in threaded connection with the left flange, the nut is inserted into a left hole of the nut sleeve and the end face of the nut sleeve is attached and fixed; the left wear-resisting ring and the right wear-resisting ring are respectively arranged at two ends of the outer circular surface of the nut, and the outer circular surfaces of the left wear-resisting ring and the right wear-resisting ring are matched with an inner hole of the cylinder body to guide; the right flange is fixed on the right side of the nut, and the right flange and the left flange respectively carry out axial limiting on the right wear-resisting ring and the left wear-resisting ring so as to prevent the right wear-resisting ring and the left wear-resisting ring from sliding off from the mounting surface of the nut.

Furthermore, a sealing element is connected between the lug plate assembly and the cylinder body to seal and protect the inner cavity of the cylinder body assembly.

Further, the left bearing assembly comprises a bearing A, a bearing seat A, a bearing end cover, a bearing oil seal, a bearing retainer ring A, a bearing retainer ring B, a locking nut and a left cushion pad; the bearing A, the bearing retainer ring B, the bearing oil seal, the bearing end cover and the locking nut are integrally arranged in an inner hole of the bearing seat A; the inner hole of the bearing A is in interference connection with the lead screw optical axis, the inner holes of the bearing retainer ring A and the bearing retainer ring B are in clearance connection with the lead screw optical axis, and the locking nut is matched with the lead screw thread to lock the bearing A; and the outer ring of the bearing A is in transition fit connection with the inner hole of the bearing seat A.

Further, the left cushion pad is fixedly installed on the end face of the bearing seat A, and when the nut assembly and the left bearing assembly are in mechanical collision, the cushion pad mechanically cushions the collision.

Further, right bearing assembly includes bearing B, bearing frame B and right blotter, bearing B installs in bearing frame B hole, and right blotter installation is fixed in on the terminal surface of bearing frame B, and when nut component and right bearing assembly will take place mechanical collision, right blotter carries out mechanical buffering to the collision.

Further, the ear assembly comprises: the lug plate, the joint bearing, the guide plate and the bearing retainer ring C; the lug is provided with a positioning cylindrical surface, and the positioning cylindrical surface is connected with the nut component; the upper plane and the lower plane of the lug plate are provided with fixed guide plates which form a sliding pair with a sliding chute of the cylinder body; the joint bearing is arranged in a bearing hole of the lug plate and is axially arranged and fixed through a bearing retainer ring C.

The beneficial results of the utility model are:

the utility model can realize the work with larger stroke in the limited installation space by partially overlapping the installation space and the working space.

In the utility model, the servo motor, the cylinder body assembly and the output end are arranged in parallel but in different axes, thereby realizing compact structural design and greatly saving the space of the push rod.

In the utility model, most of the structure is fixed, static and closed, and only the output end is partially exposed, so that the utility model is safer and more reliable.

Drawings

FIG. 1 is a schematic view of a conventional electric putter;

FIG. 2 is a schematic view of the compact power putter of the present invention;

FIG. 3 is a schematic view of the reduction case of the present invention;

FIG. 4 is a schematic view of a cylinder assembly of the present invention;

FIG. 5 is a schematic view of a cylinder assembly of the present invention;

FIG. 6 is a schematic view of the left bearing assembly of the cylinder assembly of the present invention;

FIG. 7 is a schematic view of a nut assembly of the cylinder assembly of the present invention;

FIG. 8 is a schematic view of the right bearing assembly of the cylinder assembly of the present invention;

FIG. 9 is a schematic view of a tab assembly of the cylinder assembly of the present invention;

fig. 10 is a schematic view of a tab assembly of the cylinder assembly of the present invention.

In the figure, a servo motor-1, a speed reducer-2, a speed reducing box body-3, a cylinder body component-4, a box body-31, a cover plate-32, a driving wheel-33, a driving wheel baffle-34, a driven wheel-35, a driven wheel baffle-36, a transmission belt-37, a lead screw-41, a left bearing component-42, a nut component-43, a right bearing component-44, a cylinder body-45, a lug component-46, a sealing element-47, a bearing-421, a bearing seat-422, a bearing end cover-423, a bearing oil seal-424, a bearing retainer-425, a bearing retainer-426, a locking nut-427, a left cushion-428, a left flange-431, a left wear-resistant ring-432, a nut-433, a nut sleeve-434, a speed reducing box body-3, a cylinder body component-4, a box body-31, a cover plate-32, a driving wheel-33, a driving wheel baffle-34, a driving wheel baffle-35, a driven wheel baffle-36, a transmission belt-37, a transmission belt-41, a lead screw component, a left bearing component-42, a left bearing component-43, a right bearing component-44, a cylinder body-45, a cylinder body-428, a left cushion component-46, a left flange-433, a left flange-35, a left wear-3, a left wear-resistant ring, a left wear-resistant ring component, a bearing cover component, a bearing cover component, Right wear ring-435, right flange-436, bearing-441, bearing seat-442, right cushion-443, lug-461, knuckle bearing-462, guide plate-463 and bearing retainer-464.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 2, the compact electric putter of the present invention includes a servo motor 1, a decelerator 2, a deceleration case 3, and a cylinder block assembly 4.

The output end of the servo motor 1 is connected with the input end of the speed reducer 2, and the output end of the servo motor 1 faces one side of the input end of the speed reducer 2. The speed reducer 2 is arranged on the same axial direction as the servo motor 1, and the output end of the speed reducer 2 is coaxial with and connected with the input end of the speed reducer box body 3. The output end of the reduction box body 3 is coaxial and connected with the input end of the cylinder body assembly 4, and the output end of the cylinder body assembly 4 is parallel to the axis of the main body of the reduction box body and is arranged in a different axis.

In normal working process, the servo motor 1 outputs a certain torque and rotation speed, which are converted into required torque and rotation speed through the reducer 2 and the reduction box 3 and used as input of the cylinder assembly 4, and the cylinder assembly 4 receives the torque and rotation speed and converts the torque and rotation speed into final push-pull force and linear speed for output.

As shown in fig. 3, the reduction case 3 includes a case 31, a cover 32, a drive pulley 33, a drive pulley guard 34, a driven pulley 35, a driven pulley guard 36, and a transmission belt 37.

The box body 31 and the cover plate 32 are connected to form a sealed cavity, a transmission wheel train (mainly comprising a driving wheel 33, a driven wheel 35 and a transmission belt 37) is contained in the sealed cavity, the driving wheel 33 is used as an input end of the reduction box body 3 and is connected with an output end of the reduction gear 2, and a driving wheel baffle 34 is used for connecting the connection in an axial direction; the driven wheel 35 is used as the output end of the reduction box body 3 and is connected with the input end of the cylinder body component 4, and the driven wheel baffle 36 is used for axially fixing the connection; the transmission belt 37 is a transmission connection pivot of the driving wheel 33 and the driven wheel 35.

As shown in fig. 4 and 5, the cylinder assembly 4 includes a lead screw 41, a left bearing assembly 42, a nut assembly 43, a right bearing assembly 44, a cylinder 45, a tab assembly 46, and a seal 47.

The cylinder assembly 4 mainly converts the input torque and rotation speed into push-pull force and linear velocity through the transmission of the lead screw 41, but because of the sensitivity of the lead screw transmission to the overturning moment and radial force, the overturning moment and radial force generated by the load of the output end to the lead screw transmission need to be overcome. In this embodiment, the turning moments generated by the nut 433 in opposite directions and equal in magnitude are balanced by the supporting guides (left wear ring 432 and right wear ring 435, see fig. 6) on the nut assembly 43.

During the screw drive of cylinder body subassembly 4, nut 433 will produce the circumference power, must balance in order to prevent nut 433 rotation to guarantee the stable output of electric putter. In this embodiment, the lug assembly 46 and the chute guide of the cylinder 45 generate circumferential forces of opposite directions and equal magnitude to balance the circumferential forces.

The left bearing assembly 42 is coplanar with the bottom plane of the bearing seat of the right bearing assembly 44 and serves as a complete machine mounting plane. The left end face and the right end face of the cylinder 45 are respectively connected to the right end face and the left end face of the left bearing assembly 42 and the right bearing assembly 44; the lug assembly 46 forms a sliding pair with the guide piece 463 and the chute of the cylinder body 45; the sealing element 47 is respectively connected with the lug plate assembly 46 and the cylinder body 45, and seals and protects the inner cavity of the cylinder body assembly. The optical axis parts at the left end and the right end of the screw rod 41 are respectively connected with the respective bearings of the left bearing assembly 42 and the right bearing assembly 44; the nut assembly 43 is mounted on the shaft of the lead screw 41 to form a screw drive pair.

As shown in fig. 6, left bearing assembly 42 includes bearing 421, bearing housing 422, bearing cap 423, bearing oil seal 424, bearing retainer 425, bearing retainer 426, lock nut 427, and left cushion 428.

A bearing 421, a bearing retainer 425, a bearing retainer 426, a bearing oil seal 424, a bearing end cover 423 and a lock nut 427 are integrally installed in an inner hole of the bearing seat 422; the inner hole of the bearing 421 is in interference connection with the optical axis of the lead screw 41, the inner holes of the bearing retainer ring 425 and the bearing retainer ring 426 are in clearance connection with the optical axis of the lead screw 41, and the locking nut 427 is matched with the thread of the lead screw 41 to lock the bearing 421; the outer ring of the bearing 421 is installed in transition fit with the inner hole of the bearing seat 422; left bumper pad 428 is mounted on the end face of bearing housing 422, and when nut assembly 43 mechanically collides with left bearing assembly 42, left bumper pad 428 mechanically cushions the collision.

As shown in fig. 7, the nut assembly 43 includes a left flange 431, a left wear ring 432, a nut 433, a nut sleeve 434, a right wear ring 435, and a right flange 436.

After the left end of the nut 433 is in threaded connection with the left flange 431, the left end of the nut is inserted into the left hole of the nut sleeve 434 and the end face of the nut sleeve is attached and fixed; the left wear-resisting ring 432 and the right wear-resisting ring 435 are respectively arranged at two ends of the outer circular surface of the nut 434, and the outer circular surface of the left wear-resisting ring and the outer circular surface of the right wear-resisting ring are matched with an inner hole of the cylinder body 45 to form guidance; the right flange 436 is fixed to the right side of the nut 433, and axially limits the right wear ring 435 and the left wear ring 432 with the left flange 431, respectively, so as to prevent the wear rings from sliding off the mounting surface of the nut 433.

As shown in fig. 8, the right bearing assembly 44 includes a bearing 441, a bearing housing 442, and a right cushion 443. The bearing 441 is installed in the inner hole of the bearing housing 442, and the right cushion 443 is installed and fixed on the end surface of the bearing housing 442, so that the right cushion 442 mechanically cushions the collision when the nut assembly 43 and the right bearing assembly 44 are mechanically collided.

As shown in fig. 9 and 10, the tab assembly 46 includes a tab 461, a spherical plain bearing 462, a guide 463 and a bearing retainer 464. The end part of the lug piece 461 is provided with a positioning cylindrical surface which is matched and connected with a corresponding positioning cylindrical hole of the nut component 43; the upper and lower planes of the lug 461 are provided with fixed guide pieces 463 which form a sliding pair with the sliding groove of the cylinder body 45; the spherical plain bearing 462 is mounted in a bearing hole of the lug 461 and is axially fixed by a retainer ring 464.

Claims

1. The utility model provides an electric putter of compact, includes servo motor (1), reduction gear (2), reduction gear box (3) and cylinder body subassembly (4), its characterized in that: the output end of the servo motor (1) is connected with the input end of the speed reducer (2), the output end of the speed reducer (2) is connected with the input end of the speed reduction box body (3), the output end of the speed reduction box body (3) is connected with the input end of the cylinder body assembly (4), and the output end of the cylinder body assembly (4) and the main body axis of the cylinder body assembly (4) are arranged in a non-coaxial parallel mode; the cylinder assembly (4) comprises a lead screw (41), a left bearing assembly (42), a nut assembly (43), a right bearing assembly (44), a cylinder body (45) and an ear plate assembly (46), and the bottom planes of the bearing seats of the left bearing assembly (42) and the right bearing assembly (44) are coplanar and are used as a whole machine mounting plane; the left end face and the right end face of the cylinder body (45) are respectively connected to the right end face and the left end face of the left bearing assembly (42) and the right bearing assembly (44); the left end and the right end of the screw rod (41) are respectively connected with the respective bearings of a left bearing assembly (42) and a right bearing assembly (44), and a nut assembly (43) is arranged on the shaft of the screw rod (41) to form a screw transmission pair; the lug plate assembly (46) forms a sliding pair with a sliding groove of the cylinder body (45) through the guide plate (463), the lug plate assembly (46) is fixedly connected with the nut assembly (43), a bearing inner hole of the lug plate assembly (46) is an output end and runs back and forth along the sliding groove on the cylinder body (45), and the installation space and the working space of the electric push rod are overlapped.

2. The compact electric putter of claim 1, wherein: the nut assembly (43) comprises a left flange (431), a left wear-resistant ring (432), a nut (433), a nut sleeve (434), a right wear-resistant ring (435) and a right flange (436), and after the left end of the nut (433) is in threaded connection with the left flange (431), the nut assembly is inserted into the left hole of the nut sleeve (434) and is attached and fixed on the end face; the left wear-resisting ring (432) and the right wear-resisting ring (435) are respectively installed at two ends of the outer circular surface of the nut sleeve (434), and the outer circular surfaces of the left wear-resisting ring (432) and the right wear-resisting ring (435) are matched with an inner hole of the cylinder body (45) to guide; the right flange (436) is fixed on the right side of the nut (433), and axially limits the right wear-resisting ring (435) and the left wear-resisting ring (432) with the left flange (431) respectively to prevent the right wear-resisting ring and the left wear-resisting ring from sliding off from the mounting surface of the nut (433).

3. The compact electric putter of claim 1, wherein: and a sealing piece (47) is also connected between the lug plate assembly (46) and the cylinder body (45) to seal and protect the inner cavity of the cylinder body assembly.

4. The compact electric putter of claim 1, wherein: the left bearing assembly (42) comprises a bearing A (421), a bearing seat A (422), a bearing end cover (423), a bearing oil seal (424), a bearing retainer A (425), a bearing retainer B (426), a locking nut (427) and a left cushion pad (428); the bearing A (421), the bearing retainer A (425), the bearing retainer B (426), the bearing oil seal (424), the bearing end cover (423) and the locking nut (427) are integrally installed in an inner hole of the bearing seat A (422); the inner hole of the bearing A (421) is in interference connection with the optical axis of the lead screw (41), the inner holes of the bearing retainer ring A (425) and the bearing retainer ring B (426) are in clearance connection with the optical axis of the lead screw (41), and the locking nut (427) is matched with the thread of the lead screw (41) to lock the bearing A (421); and the outer ring of the bearing A (421) is in transition fit connection with the inner hole of the bearing seat A (422).

5. The compact electric putter of claim 4, wherein: the left buffer cushion (428) is fixedly arranged on the end surface of the bearing seat A (422), and when the nut component (43) and the left bearing component (42) are in mechanical collision, the buffer cushion (428) can mechanically buffer the collision.

6. The compact electric putter of claim 1, wherein: the right bearing assembly (44) comprises a bearing B (441), a bearing seat B (442) and a right buffering cushion (443), the bearing B (441) is installed in an inner hole of the bearing seat B (442), the right buffering cushion (443) is installed and fixed on the end face of the bearing seat B (442), and when the nut assembly (43) and the right bearing assembly (44) are in mechanical collision, the right buffering cushion (443) mechanically buffers the collision.

7. The compact electric putter of claim 1, wherein: the ear panel assembly (46) comprises: a lug plate (461), a joint bearing (462), a guide plate (463) and a bearing retainer ring C (464); the lug (461) is provided with a positioning cylindrical surface, and the positioning cylindrical surface is connected with the nut component (43); the upper plane and the lower plane of the lug plate (461) are provided with fixed guide plates (463) which form a sliding pair with a sliding groove of the cylinder body (45); the knuckle bearing (462) is installed in a bearing hole of the lug plate (461) and is axially installed and fixed through a bearing retainer ring C (464).