Servo electric cylinder

Abstract

The utility model provides a servo electric cylinder which comprises a servo motor, a speed reducer, a gear transmission assembly, a lead screw nut transmission assembly and a sealing lubrication assembly which are sequentially connected, and the sealing lubrication assembly comprises a front flange plate and a rear flange plate which are connected with a cylinder body and a push rod in the lead screw nut transmission assembly respectively. The front flange plate and the rear flange plate are connected through an organ cover; an O-shaped ring is arranged between the rear flange plate and the push rod for sealing; a sealing disc and a rear end cover are arranged between the cylinder body and the front flange plate, and a lip-shaped sealing ring and a wear-resistant copper sleeve are arranged between the sealing disc and the push rod and between the rear end cover and the push rod respectively. The sealing performance of the servo electric cylinder can be effectively improved through the matched design of the O-shaped ring, the organ cover and the lip-shaped sealing ring, the push rod can be better supported through the arrangement of the abrasion-resistant copper sleeve, and the movement stability of the push rod is improved. According to the servo electric cylinder, the sealing performance of movable connection between the push rod and the cylinder body can be effectively guaranteed, and the transmission stability of the electric cylinder is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder technology, specifically a servo electric cylinder. Background Technology

[0002] Servo electric cylinders are modular products that integrate servo motors and lead screws. They convert the rotary motion of the servo motor into the linear motion of the lead screw and output corresponding power. They make full use of the precise speed control advantages of servo motors to achieve high-precision linear motion and are widely used in various industrial fields.

[0003] During operation, the push rod slides back and forth along the cylinder body under the action of the lead screw. Poor sealing between the push rod and the cylinder body often affects the equipment's operating condition. For example, existing patent CN210297449U discloses an optimized servo electric cylinder, including a cylinder body with front and rear fixed flanges. The push rod passes through the inside of the cylinder body, and the lead screw coaxially passes through the push rod. A connecting piece and threaded engagement with the push rod convert rotational motion into linear motion of the push rod. In existing structures, the push rod only slides against the flanges on the cylinder body, without an effective sealing device to seal the sliding gap.

[0004] Based on the above problems, it is necessary to propose a servo electric cylinder that can effectively ensure the sealing of the dynamic connection between the push rod and the cylinder body, thereby improving the service life of the electric cylinder. Utility Model Content

[0005] This invention provides a servo electric cylinder that effectively ensures the sealing of the dynamic connection between the push rod and the cylinder body, and improves the transmission stability of the electric cylinder.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model solves the above-mentioned problems through the following technical solution:

[0007] A servo electric cylinder includes a servo motor, a reducer, a gear transmission assembly, and a lead screw and nut transmission assembly connected in sequence. The lead screw and nut transmission assembly includes a cylinder body, a push rod, and a lead screw coaxially arranged from the outside to the inside. The push rod is fixed to the lead screw and nut, and the lead screw and nut are threadedly engaged with the lead screw to drive the push rod to slide back and forth along the cylinder body. A sealing and lubrication assembly is configured at the output end of the lead screw and nut transmission assembly. The sealing and lubrication assembly includes a front flange and a rear flange connected to the cylinder body and the push rod, respectively. The front flange and the rear flange are connected by a bellows cover, and an O-ring seal is provided between the rear flange and the push rod. A sealing plate and a rear end cover are provided between the cylinder body and the front flange. A lip seal is provided between the sealing plate and the push rod, and a wear-resistant copper sleeve is provided between the rear end cover and the push rod.

[0008] Furthermore, the gear transmission assembly includes a small gear and a large gear installed in the gear transmission housing and connected to the reducer and the lead screw in the nut transmission assembly, respectively, with the small gear and the large gear meshing and transmitting power; the lead screw is rotatably connected to the gear transmission housing through a bearing assembly, and the front end of the cylinder is fixed to the gear transmission housing; the bearing assembly includes an angular contact ball bearing, a thrust ball bearing, and a deep groove ball bearing I installed sequentially from front to back.

[0009] Furthermore, a retaining ring I and an adjusting shim are provided between the angular contact ball bearing and the large gear, and a retaining ring II is provided between the deep groove ball bearing I and the rear cover of the gear transmission housing.

[0010] Furthermore, the lead screw and nut transmission assembly includes a cylinder body, a push rod, a lead screw, and a lead screw nut; the front end of the cylinder body is fixedly connected to the gear transmission assembly, the push rod passes through the cylinder body, the lead screw passes coaxially through the push rod, the push rod and the lead screw nut are fixedly connected, and the lead screw nut and the lead screw are threadedly engaged to drive the push rod to slide back and forth along the cylinder body; it also includes multiple guide keys installed on the inner wall of the cylinder body along the length of the cylinder body, and the lead screw nut is provided with guide grooves that cooperate with the guide keys.

[0011] The advantages and effects of this utility model are:

[0012] 1. The servo electric cylinder described in this utility model is equipped with a sealing and lubrication component at the output end of the lead screw and nut transmission assembly. Through the combined design of O-rings, bellows covers, and lip seals, the sealing performance of the servo electric cylinder is effectively improved, preventing impurities from entering the cylinder body.

[0013] 2. The design incorporates a wear-resistant copper sleeve between the push rod and the cylinder block. This provides better support for the push rod, improves its stability, and prevents buckling under stress. Simultaneously, the oil groove in the wear-resistant copper sleeve allows for the addition of lubricating oil to lubricate the push rod, reducing friction between the push rod and the copper sleeve.

[0014] 3. The design incorporates a bearing assembly to support the rotation of the push rod. A deep groove ball bearing (I) is used in conjunction with an angular contact ball bearing to jointly support the lead screw in the radial direction. The angular contact ball bearing also bears the axial and radial forces transmitted from the large gear, while the thrust ball bearing bears the larger axial force transmitted back from the push rod. This bearing assembly effectively ensures stable rotation of the lead screw.

[0015] 4. The gear transmission assembly in this design is equipped with retaining rings I and II to preload the bearings, compensating for wear during operation, reducing noise, increasing rigidity, and extending service life. Adjusting shims are used to adjust the meshing length of the two gears in the width direction, eliminating assembly errors and improving the smoothness of gear meshing transmission. Attached Figure Description

[0016] Figure 1 This is a front view of the overall structure of this utility model;

[0017] Figure 2 This is a top view of the overall structure of this utility model;

[0018] Figure 3 For along Figure 2 Sectional view of line AA in the middle;

[0019] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0020] Figure 5 for Figure 3 A magnified view of a section at point C.

[0021] Part number markings: 1. Servo motor, 2. Reducer, 3. Gear transmission assembly, 301. Gear transmission housing, 302. Pinion, 303. Gear, 304. Angular contact ball bearing, 305. Thrust ball bearing, 306. Deep groove ball bearing I, 307. Retaining ring I, 308. Adjusting shim, 309. Retaining ring II, 310. Deep groove ball bearing II;

[0022] 4. Lead screw and nut transmission assembly, 41. Cylinder body, 42. Push rod, 43. Lead screw, 44. Lead screw nut, 45. Guide key; 5. Sealing and lubrication assembly, 51. Front flange, 52. Rear flange, 53. Bellows cover, 54. O-ring, 55. Sealing disc, 56. Rear end cover, 57. Lip seal, 58. Wear-resistant copper sleeve, 59. Set screw. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0024] This embodiment describes a servo electric cylinder, as shown in the attached figure. Figure 1-3 As shown, the main body includes a servo motor 1, a reducer 2, a gear transmission assembly 3, a lead screw and nut transmission assembly 4, and a sealing and lubrication assembly 5 connected in sequence. The torque output by the servo motor 1 is transmitted to the gear transmission assembly 3 via the planetary reducer 2. The gear transmission assembly 3 drives the lead screw and nut transmission assembly 4 to work, and the lead screw and nut transmission assembly 4 converts the rotary motion into linear motion output.

[0025] The lead screw and nut transmission assembly 4 includes a cylinder body 41, a push rod 42, a lead screw 43, a lead screw nut 44, and guide keys 45. The front end of the cylinder body 41 is fixed to the gear transmission housing 301 of the gear transmission assembly 3. The push rod 42 passes through the cylinder body 41, and the lead screw 43 is coaxially inserted through the push rod 42. The lead screw 43 is connected to the torque output end of the gear transmission assembly 3 (one end of the lead screw and nut transmission assembly 4 connected to the gear transmission assembly 3 is the front end, and the other end is the rear end). In this embodiment, there are two guide keys 45, which are installed relative to each other on the inner wall of the cylinder body 41 by screws. The guide keys 45 extend along the length of the cylinder body 41. The lead screw nut 44 is provided with guide grooves that cooperate with the guide keys 45 for sliding engagement. The front end of the push rod 42 is fixed to the lead screw nut 44. The lead screw nut 44 and the lead screw 43 are threaded together, which drives the push rod 42 to slide back and forth along the cylinder body 41. The end of the push rod 42 is directly connected to the load, thereby pushing the load to perform linear motion.

[0026] The output end (tail end) of the lead screw nut transmission assembly 4 is equipped with a sealing and lubrication assembly 5. The sealing and lubrication assembly 5 includes a sealing disc 55, a rear end cover 56, and a front flange 51, which are fixedly connected sequentially from front to back. The front end of the sealing disc 55 is fixed to the cylinder body 41. The front flange 51 is clearance-fitted with the push rod 42, and the rear flange 52 is fixedly connected to the push rod 42 by set screws 59. The front flange 51 and the rear flange 52 are connected by a bellows cover 53. An O-ring 54 is embedded in the inner groove of the rear flange 52, pressing against the push rod 42 to form a static seal on the push rod 42, as shown in the attached diagram. Figure 5 As shown. Because the bellows cover 53 is telescopic, it is in a retracted state when the push rod 42 is closed, and it will also be in an expanded state when the push rod 42 is expanded. This ensures that the bellows cover 53 can always seal the push rod 42 during the entire movement process, preventing external impurities from entering and affecting the movement of the push rod 42.

[0027] A lip seal 57 is provided between the sealing disc 55 and the push rod 42 to achieve dynamic sealing during the movement of the push rod 42. A wear-resistant copper sleeve 58 is provided between the rear end cover 56 and the push rod 42. The inner side of the wear-resistant copper sleeve 58 fits against the outer side of the push rod 42. Lubricating oil can be added to the wear-resistant copper sleeve 58 to reduce the friction between the push rod 42 and the wear-resistant copper sleeve 58 during movement, and to better support the push rod 42, improve the stability of the push rod 42's movement, and prevent the push rod 42 from buckling under force.

[0028] As attached Figure 3 , 4As shown, the gear transmission assembly 3 includes a gear transmission housing 301, and a pinion 302, a large gear 303, an angular contact ball bearing 304, a thrust ball bearing 305, a deep groove ball bearing I 306, a retaining ring I 307, an adjusting shim 308, a retaining ring II 309, and a deep groove ball bearing II 310, all installed within the gear transmission housing 301. The pinion 302 meshes with the large gear 303 to transmit power. The output shaft of the reducer 2 is connected to the pinion 302 via a key. The large gear 303 is rigidly connected to the lead screw 43 of the lead screw and nut transmission assembly 4 via a key. The rotation of the large gear 303 drives the lead screw 43 to rotate simultaneously. The deep groove ball bearing II 310 is installed between the gear transmission housing 301 and the output shaft of the reducer 2, supporting the output shaft of the reducer 2 and thus improving transmission smoothness.

[0029] The lead screw 43 is rotatably connected to the gear transmission housing 301 via a bearing assembly. The bearing assembly includes, from front to back, an angular contact ball bearing 304, a thrust ball bearing 305, and a deep groove ball bearing I306. The deep groove ball bearing I306, in conjunction with the angular contact ball bearing 304, supports the lead screw 43 radially, enabling its normal rotation. Simultaneously, the angular contact ball bearing 304 can also withstand the axial and radial forces transmitted from the large gear 303, while the thrust ball bearing 305 withstands the axial force transmitted back from the push rod 42, ensuring that the lead screw and nut transmission assembly 4 stably converts rotational motion into linear motion output.

[0030] A retaining ring I307 and an adjusting shim 308 are provided between the angular contact ball bearing 304 and the large gear 303, and a retaining ring II309 is provided between the deep groove ball bearing I306 and the rear cover of the gear transmission housing 301. Retaining ring I307 is used to preload the deep groove ball bearing I306, retaining ring II309 is used to preload the angular contact ball bearing 304, and adjusting shim 308 is used to adjust the meshing length of the pinion 302 and the large gear 303 in the width direction, eliminating assembly errors and improving the smoothness of gear transmission.

[0031] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A servo electric cylinder, comprising a servo motor (1), a reducer (2), a gear transmission assembly (3), and a lead screw and nut transmission assembly (4) connected in sequence; the lead screw and nut transmission assembly (4) comprises a cylinder body (41), a push rod (42), and a lead screw (43) coaxially arranged from the outside to the inside, the push rod (42) being fixedly connected to the lead screw nut (44), and the lead screw nut (44) and the lead screw (43) being threadedly engaged to drive the push rod (42) to slide back and forth along the cylinder body (41), characterized in that: The output end of the lead screw and nut transmission assembly (4) is equipped with a sealing and lubrication assembly (5); the sealing and lubrication assembly (5) includes a front flange (51) and a rear flange (52) respectively connected to the cylinder body (41) and push rod (42) in the lead screw and nut transmission assembly (4); the front flange (51) and the rear flange (52) are connected by a bellows cover (53), and an O-ring (54) is provided between the rear flange (52) and the push rod (42) for sealing; A sealing disc (55) and a rear end cover (56) are provided between the cylinder body (41) and the front flange (51). A lip seal (57) is provided between the sealing disc (55) and the push rod (42). A wear-resistant copper sleeve (58) is provided between the rear end cover (56) and the push rod (42).

2. A servo electric cylinder according to claim 1, characterized in that: The gear transmission assembly (3) includes a small gear (302) and a large gear (303) installed in the gear transmission housing (301) and connected to the reducer (2) and the lead screw (43) in the nut transmission assembly (4) respectively. The small gear (302) and the large gear (303) mesh and transmit power. The lead screw (43) is rotatably connected to the gear transmission housing (301) via a bearing assembly, and the front end of the cylinder (41) is fixed to the gear transmission housing (301); the bearing assembly includes, from front to back, an angular contact ball bearing (304), a thrust ball bearing (305), and a deep groove ball bearing. (306).

3. A servo electric cylinder according to claim 2, characterized in that: A retaining ring is provided between the angular contact ball bearing (304) and the large gear (303). (307) and adjusting shims (308), deep groove ball bearing A retaining ring is provided between (306) and the rear cover of the gear transmission housing (301). (309).

4. A servo electric cylinder according to claim 1, characterized in that: The lead screw and nut transmission assembly (4) also includes a plurality of guide keys (45) installed on the inner wall of the cylinder (41) along the length of the cylinder (41), and the lead screw and nut (44) is provided with guide grooves that cooperate with the guide keys (45).

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