Ball screw type electric cylinder

Abstract

The utility model relates to a ball screw type electric cylinder, which comprises a driving part, a synchronous belt, a synchronous wheel, a ball screw, a ball screw, a ball screw, a ball screw and a ball screw, and is characterized in that the driving part is used as a power source to drive the synchronous belt and the synchronous wheel to rotate; the synchronous belt is connected with the driving part; the synchronous wheel set is connected with the synchronous belt; the ball nut is connected with the synchronous wheel set; the ball screw is connected with the ball nut; the roller pin plane integrated bearing is arranged on the outer side of the ball nut in a sleeving manner; the plane bearing is arranged on the outer side of the ball screw in a sleeving manner; and the ball screw penetrates through the mounting cover, the roller pin and plane integrated bearing and the plane bearing are respectively connected with the mounting cover. Compared with the prior art, the problems that a traditional electric cylinder is high in cost and complex in part number are solved, the problem that after the traditional electric cylinder is used for a long time for a long time, an electric cylinder guide block is prone to abrasion, and the electric cylinder shakes is solved, and the bearing capacity can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder technology, and in particular to a ball screw electric cylinder. Background Technology

[0002] An electric cylinder is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a push rod. The principle of an electric cylinder is that the electric motor, after being reduced in speed by gears, drives a pair of lead screws and nuts, converting the motor's rotary motion into linear motion. The push rod action is completed by utilizing the forward and reverse rotation of the motor. Complex actions such as rotation and rocking can be accomplished through various levers, rockers, or linkage mechanisms. By changing the lever arm length, the stroke can be increased or decreased. Common electric cylinder structures are shown in [the original text]. Figure 14 It includes a servo motor, cylinder, and lead screw.

[0003] Currently, many commercially available presses use electric cylinders as their output force mechanism. Due to technical limitations, most electric cylinders must be relatively long, requiring space for the lower lead screw, resulting in a large and elongated cylinder size. This makes them unsuitable for applications with limited installation requirements, and improper installation or manufacturing can easily lead to self-rotation and vibration. Furthermore, while the lead screw in conventional electric cylinders can bear a certain weight, its load-bearing capacity is limited.

[0004] In addition, due to the high precision requirements and complex structure of electric cylinders, their ex-factory price is relatively high. Small-sized electric cylinders generally cost between 1,500 and 5,000 yuan, which is not conducive to cost reduction and efficiency improvement. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology by providing a ball screw electric cylinder. This cylinder utilizes a structure including an integrated needle roller bearing and a planar bearing. A servo motor acts as the power source, driving a synchronous pulley (synchronous drive pulley (first synchronous pulley) and synchronous belt) to rotate. This rotation is transmitted to the driven pulley (second synchronous pulley) of the synchronous belt, which in turn rotates a ball nut with a first key pin. The rotation of the ball nut transforms the ball screw's rotational motion into vertical motion, thus overcoming the problems of high cost and numerous complex parts in traditional electric cylinders. Furthermore, it addresses the issue of wear on the guide block and cylinder wobbling after prolonged use, and effectively improves load-bearing capacity.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] The purpose of this utility model is to provide a ball screw electric cylinder, which includes:

[0008] A driving component, used as a power source to drive a synchronous belt and synchronous pulleys to rotate; a synchronous belt, connected to the driving component; a synchronous pulley set, connected to the synchronous belt; a ball nut, connected to the synchronous pulley set; a ball screw, connected to the ball nut; a needle roller flat bearing, sleeved on the outside of the ball nut; a flat bearing, sleeved on the outside of the ball screw; and a mounting cover, through which the ball screw passes, with the needle roller flat bearing and the flat bearing respectively connected to the mounting cover.

[0009] Furthermore, the ball screw electric cylinder also includes a ring sleeve, which is sleeved on the outside of the ball screw and between the ball screw and the plane bearing. The ring sleeve is used to prevent the ball screw from shaking.

[0010] Furthermore, the ring is made of stainless steel.

[0011] Furthermore, the driving component is a servo motor; the servo motor includes a motor body and an output shaft connected to the motor body; the motor body is connected to a mounting cover; and the output shaft is connected to a synchronous pulley set.

[0012] Furthermore, the timing pulley set includes a first timing pulley and a second timing pulley; the first timing pulley and the second timing pulley are connected by a timing belt; the first timing pulley is connected to a driving component; and the second timing pulley is connected to a ball nut.

[0013] Furthermore, the outer sides of the first and second synchronous pulleys are respectively connected to the synchronous belt; the inner side of the first synchronous pulley is connected to the outer side of the drive component; the inner side of the second synchronous pulley is connected to the outer side of the ball nut; and the inner side of the ball nut is connected to the outer side of the ball screw.

[0014] Furthermore, the ball nut is provided with a first key pin; the second synchronous pulley of the synchronous pulley assembly is provided with a keyway that matches the first key pin.

[0015] Furthermore, the ball screw type electric cylinder also includes an electric cylinder cover; the electric cylinder cover and the mounting cover are connected; the ball screw passes through the electric cylinder cover and the mounting cover.

[0016] Furthermore, the ball screw electric cylinder also includes a lower limit block and a guide shaft; the lower limit block is connected to the ball screw; the lower limit block is connected to the guide shaft; and the guide shaft passes through the mounting cover.

[0017] Furthermore, the guide shaft provides stability to the ball screw, ensuring that it does not wobble during the rising and falling process.

[0018] Furthermore, the ball screw electric cylinder also includes a guide sleeve; the guide sleeve is connected to the mounting cover; the guide sleeve is sleeved on the outside of the guide shaft.

[0019] Furthermore, the ball nut includes a flange and a ball nut body; the flange and the ball nut body are connected; the needle roller flat integrated bearing is sleeved on the outside of the ball nut body; the flat bearing is located on the side of the ball nut flange away from the ball nut body.

[0020] Furthermore, the integral needle roller bearing includes a needle roller bearing portion and a flat bearing portion; the needle roller bearing portion and the flat bearing portion are connected.

[0021] This structure uses a servo motor as its power source, driving the synchronous pulley (synchronous drive pulley (first synchronous pulley) and synchronous belt) to rotate. The rotation is then transmitted via the synchronous belt to the driven pulley (second synchronous pulley), which in turn transmits power to the ball nut with the first key pin. The rotation of the ball nut drives the ball screw to move up and down, thus achieving displacement control, speed control, and delay control of the ball screw's vertical movement. The integrated needle roller bearing prevents hard friction during the rotation of the ball nut. The mounting block (second cover plate) is tightly fitted to the ball nut to prevent wobbling. The flat bearing reduces the friction of the ball screw's vertical reaction force on the rotational motion, converting hard friction into bearing rotational motion. The guide shaft provides stability to the ball screw, ensuring minimal wobbling during ascent and descent.

[0022] This structure is simple and inexpensive, costing only one-third of that of a conventional electric cylinder (which has complex and numerous parts). It is also compact, eliminating the need for a long, narrow outer cylinder housing. By modifying the motion structure of the ball screw and ball nut, it saves a long, narrow cavity compared to existing electric cylinder designs, reducing the volume by two-thirds. It also eliminates the need for a circular shaft, significantly reducing the number of parts and machining components, resulting in lower costs, less space required, and ease of use.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The ball screw electric cylinder provided by this technical solution is powered by a servo motor, which drives the synchronous pulley (synchronous drive pulley (first synchronous pulley) and synchronous belt) to rotate and transmits the transmission through the synchronous belt to the synchronous belt driven pulley (second synchronous pulley), which in turn transmits the transmission to the ball nut with the first key pin. The rotation of the ball nut drives the ball screw to move up and down, thereby achieving the function of extending and retracting the electric cylinder.

[0025] 2) The ball screw electric cylinder provided by this technical solution, by setting up structures such as needle roller flat integrated bearing and flat bearing, can prevent hard friction when the ball nut rotates, and the flat bearing can reduce the friction of the upper and lower reaction forces of the ball screw on the rotational motion, and transform hard friction into bearing rotational motion. This changes the problem of electric cylinder wobbling caused by easy wear of the electric cylinder guide block after long-term durable use of traditional electric cylinders. It is not easy to wobble during the rising and falling process, and compared with the excessive force of round bearings causing the bearing balls to fall off, it can effectively improve the load-bearing capacity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0027] Figure 2 This is a top view of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0028] Figure 3 This is a front view of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0029] Figure 4 This is a cross-sectional schematic diagram of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0030] Figure 5 This is a schematic diagram of the structure of the ball screw electric cylinder in Embodiment 3 of this utility model.

[0031] Figure 6 This is an exploded view of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0032] Figure 7 This is a schematic diagram of the structure of the upper cover of the ball screw electric cylinder in Embodiment 1 of this utility model. Figure 1 .

[0033] Figure 8 This is a schematic diagram of the structure of the upper cover of the ball screw electric cylinder in Embodiment 1 of this utility model. Figure 2 .

[0034] Figure 9 This is a schematic diagram (partial perspective) of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0035] Figure 10 This is a top view (partial perspective) of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0036] Figure 11 This is a front view (partial perspective) of the ball screw electric cylinder in Embodiment 2 of this utility model.

[0037] Figure 12 This is a front view of the ball screw electric cylinder in Embodiment 2 of this utility model (partial perspective and the lower limit block and upper limit block are not fully shown).

[0038] Figure 13 This is a partial perspective view of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0039] Figure 14 This is a schematic diagram of the structure of a common electric cylinder.

[0040] Figure 15 This is a front view (partial perspective) of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0041] Figure 16 This is a partial perspective view of the ball screw electric cylinder in Embodiment 1 of this utility model.

[0042] Numbering on the map:

[0043] 1. Servo motor; 1-1. Motor body; 1-2. Output shaft; 1-3. Second key pin; 2. Synchronous belt; 3. Synchronous pulley; 3-1. First synchronous pulley; 3-2. Second synchronous pulley; 4. Ball nut; 4-1. First key pin; 4-2. Ball nut body; 4-3. Flange; 5. Ball screw; 6. Integrated needle roller bearing; 6-1. Needle roller bearing part; 6-2. Flat bearing part; 7. Flat bearing; 8. Mounting cover; 8-1. First cover plate; 8-2. Second cover plate; 9. Electric cylinder upper cover; 10. Lower limit block; 11. Guide shaft; 12. Guide sleeve; 13. Upper limit block hole; 14. Lower limit block hole; 15. Upper limit block; 16. Support frame; 17. Ring sleeve. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0047] The present invention will be further described in detail below with reference to specific embodiments.

[0048] Example 1

[0049] like Figures 1-4 As shown in Figures 6-10 and 15-16, a ball screw electric cylinder includes:

[0050] 1. Drive component, 2. Synchronous belt, 3. Synchronous pulley set, 4. Ball nut, 5. Ball screw, 6. Integrated needle roller bearing, 7. Flat bearing, 8. Mounting cover, 9. Electric cylinder upper cover, 10. Lower limit block, 11. Guide shaft, 12. Guide sleeve, 17. Ring sleeve.

[0051] The driving component serves as a power source to drive the synchronous belt 2 and synchronous pulley 3 to rotate; the synchronous belt 2 is connected to the driving component; the synchronous pulley set 3 is connected to the synchronous belt 2; the ball nut 4 is connected to the synchronous pulley set 3; the ball screw 5 is connected to the ball nut 4; the needle roller flat integrated bearing 6 is sleeved on the outside of the ball nut 4; the flat bearing 7 is sleeved on the outside of the ball screw 5; the ring 17 is sleeved on the outside of the ball screw 5, one end of the ring 17 is located between the ball screw 5 and the flat bearing 7, and the other end of the ring 17 passes through the second cover plate 8-2 of the mounting cover 8; the mounting cover 8 is through which the ball screw 5 passes, and the needle roller flat integrated bearing 6 and the flat bearing 7 are respectively connected to the mounting cover 8.

[0052] The driving component is a servo motor 1; the servo motor 1 includes a motor body 1-1 and an output shaft 1-2 connected to the motor body 1-1; the motor body 1-1 is connected to the mounting cover 8 by screws, which can be hex socket screws; the output shaft 1-2 is connected to the synchronous pulley set 3.

[0053] The synchronous pulley set 3 includes a first synchronous pulley 3-1 and a second synchronous pulley 3-2, wherein the first synchronous pulley 3-1 is a synchronous belt drive pulley and the second synchronous pulley 3-2 is a synchronous belt driven pulley; the first synchronous pulley 3-1 and the second synchronous pulley 3-2 are connected by a synchronous belt 2, and the rotation of the first synchronous pulley 3-1 drives the rotation of the synchronous belt 2, thereby driving the rotation of the second synchronous pulley 3-2; the first synchronous pulley 3-1 is connected to a drive component, specifically, the first synchronous pulley 3-1 is connected to the output shaft 1-2 of the servo motor 1, and the rotation of the output shaft 1-2 of the servo motor 1 drives the rotation of the first synchronous pulley 3-1; the second synchronous pulley 3-2 is connected to a ball nut 4, and the rotation of the second synchronous pulley 3-2 drives the rotation of the ball nut 4.

[0054] The output shaft 1-2 is provided with a second key pin 1-3; the first synchronous wheel 3-1 of the synchronous wheel group 3 is provided with a keyway that matches the second key pin 1-3. Through the matching of the second key pin 1-3 and the keyway, the rotation of the output shaft 1-2 drives the rotation of the first synchronous wheel 3-1.

[0055] The outer side of the first synchronous pulley 3-1 and the outer side of the second synchronous pulley 3-2 are respectively connected to the synchronous belt 2; the inner side of the first synchronous pulley 3-1 is connected to the outer side of the drive component; the inner side of the second synchronous pulley 3-2 is connected to the outer side of the ball nut 4; the inner side of the ball nut 4 is connected to the outer side of the ball screw 5.

[0056] The ball nut 4 is provided with a first key pin 4-1; the second synchronous wheel 3-2 of the synchronous wheel set 3 is provided with a keyway that matches the first key pin 4-1. Through the matching of the first key pin 4-1 and the keyway, the rotation of the second synchronous wheel 3-2 drives the rotation of the ball nut 4.

[0057] The mounting cover 8 includes a first cover plate 8-1 and a second cover plate 8-2 connected to the first cover plate 8-1. The upper cover 9 of the electric cylinder and the first cover plate 8-1 of the mounting cover 8 are connected by screws, which can be hexagonal screws. The ball screw 5 passes through the upper cover 9 of the electric cylinder and the mounting cover 8. A first cavity is formed between the first cover plate 8-1 and the second cover plate 8-2 of the mounting cover 8, and a second cavity is formed between the upper cover 9 of the electric cylinder and the mounting cover 8. The first cavity and the second cavity are connected. The needle roller flat integrated bearing 6 and the flat bearing 7 are both located in the first cavity. The ball nut 4 is located in the first cavity and the second cavity. The synchronous belt 2, the first synchronous pulley 3-1 and the second synchronous pulley 3-2 are both located in the second cavity.

[0058] The outer rings of the needle roller flat bearing 6 and the flat bearing 7 are both tightly fitted (interference fit) to the inner wall of the second cover plate 8-2. The inner ring of the needle roller flat bearing 6 is tightly fitted (interference fit) to the ball screw 5. The diameter of the inner ring of the flat bearing 7 is larger than the outer diameter of the ball screw 5. In this embodiment, the diameter of the inner ring of the flat bearing 7 is 40mm, and the outer diameter of the ball screw 5 is 25mm. There is a gap between the inner ring of the flat bearing 7 and the outer ring of the ring sleeve 17, and a gap between the outer ring of the ring sleeve 17 and the flat bearing 7. The bottom surface of the flat bearing 7 is limited by the second cover plate 8-2. The second cover plate 8-2 is provided with a through hole for the ball screw 5 to pass through. The outer ring of the ring sleeve 17 is tightly fitted to the wall of the through hole of the second cover plate 8-2 of the mounting cover 8. The inner ring of the ring sleeve 17 matches the outer diameter of the ball screw 5. The ball screw 5 can move up and down relative to the ring sleeve 17, but its left and right wobbling is limited by the ring sleeve 17.

[0059] The lower limit block 10 is connected to the ball screw 5; the lower limit block 10 is connected to the guide shaft 11; the guide shaft 11 passes through the mounting cover 8. The guide shaft 11 provides stability to the ball screw 5, ensuring that it does not wobble during the rising and falling process. The guide sleeve 12 is connected to the mounting cover 8; the guide sleeve 12 is sleeved on the outside of the guide shaft 11, the guide sleeve 12 is a linear bearing, and the outside of the guide sleeve 12 is connected to the mounting cover 8.

[0060] The ball nut 4 includes a flange 4-3 and a ball nut body 4-2; the flange 4-3 and the ball nut body 4-2 are connected; the needle roller flat integrated bearing 6 is sleeved on the outside of the ball nut body 4-2 of the ball nut 4; the flat bearing 7 is located on the side of the flange 4-3 of the ball nut 4 away from the ball nut body 4-2.

[0061] The needle roller flat integrated bearing 6 includes a needle roller bearing part 6-1 and a flat bearing part 6-2; the needle roller bearing part 6-1 and the flat bearing part 6-2 are integrally connected as a whole.

[0062] Ring 17 is a stainless steel sleeve.

[0063] Example 2

[0064] like Figure 11 , 12 As shown, a ball screw electric cylinder, based on embodiment 1, further includes: an upper limit block hole 13, a lower limit block hole 14, and an upper limit block 15.

[0065] The upper limit block hole 13 and the lower limit block hole 14 are respectively provided on the sides of both ends of the ball screw 5.

[0066] The upper limit block 15 is provided with a through hole that matches the upper limit block hole 13. The connecting shaft passes through the through hole of the upper limit block 15 and connects to the upper limit block hole 13. The upper limit block 15 can limit the descent of the ball screw 5.

[0067] The lower limit block 10 is provided with a through hole that matches the lower limit block hole 14. The connecting shaft passes through the through hole of the lower limit block hole 14 and connects to the lower limit block hole 14. The lower limit block 10 can limit the rise of the ball screw 5.

[0068] Example 3

[0069] like Figure 5 As shown, a ball screw electric cylinder, based on embodiment 1, further includes a support frame 16.

[0070] The mounting cover 8 is connected to the support frame 16, and the ball screw 5 passes through the support frame 16.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A ball screw type electric cylinder characterized by, The ball screw type electric cylinder comprises: a driving member for driving a synchronous belt (2) and a synchronous wheel set (3) as a power source; a synchronous belt (2) connected with the driving member; a synchronous wheel set (3) connected with the synchronous belt (2); a ball nut (4) connected with the synchronous wheel set (3); a ball screw (5) connected with the ball nut (4); a needle roller plane integrated bearing (6) sleeved outside the ball nut (4); a plane bearing (7) sleeved outside the ball screw (5); a mounting cover (8) through which the ball screw (5) penetrates, and the needle roller plane integrated bearing (6) and the plane bearing (7) are connected with the mounting cover (8) respectively.

2. The ball screw type electric cylinder according to claim 1, characterized by The driving member is a servo motor (1); The servo motor (1) comprises a motor body (1-1) and an output shaft (1-2) connected with the motor body (1-1); The motor body (1-1) is connected with the mounting cover (8); The output shaft (1-2) is connected with the synchronous wheel set (3).

3. The ball screw type electric cylinder according to claim 1, wherein The synchronous wheel set (3) comprises a first synchronous wheel (3-1) and a second synchronous wheel (3-2); The first synchronous wheel (3-1) and the second synchronous wheel (3-2) are connected through the synchronous belt (2); The first synchronous wheel (3-1) is connected with the driving member; The second synchronous wheel (3-2) is connected with the ball nut (4).

4. The ball screw type electric cylinder according to claim 3, wherein The outer side of the first synchronous wheel (3-1) and the outer side of the second synchronous wheel (3-2) are connected with the synchronous belt (2) respectively; The inner side of the first synchronous wheel (3-1) is connected with the outer side of the driving member; The inner side of the second synchronous wheel (3-2) is connected with the outer side of the ball nut (4); The inner side of the ball nut (4) is connected with the outer side of the ball screw (5).

5. The ball screw type electric cylinder according to claim 3, wherein A first key pin (4-1) is arranged on the ball nut (4); A key groove matched with the first key pin (4-1) is arranged on the second synchronous wheel (3-2) of the synchronous wheel set (3).

6. The ball screw type electric cylinder according to claim 1, wherein The ball screw type electric cylinder further comprises an upper cover (9) of the electric cylinder; The upper cover (9) of the electric cylinder is connected with the mounting cover (8); The ball screw (5) penetrates the upper cover (9) of the electric cylinder and the mounting cover (8).

7. The ball screw type electric cylinder according to claim 1, wherein The ball screw type electric cylinder further comprises a lower limit block (10) and a guide shaft (11); The lower limit block (10) is connected with the ball screw (5); The lower limit block (10) is connected with the guide shaft (11); The guide shaft (11) penetrates the mounting cover (8).

8. The ball screw type electric cylinder according to claim 7, wherein The ball screw type electric cylinder further comprises a guide sleeve (12); The guide sleeve (12) is connected with the mounting cover (8); The guide sleeve (12) is sleeved outside the guide shaft (11).

9. The ball screw type electric cylinder according to claim 1, wherein The ball nut (4) comprises a flange plate (4-3) and a ball nut body (4-2); The flange plate (4-3) is connected with the ball nut body (4-2); The needle roller plane integrated bearing (6) is sleeved outside the ball nut body (4-2) of the ball nut (4). The plane bearing (7) is located on the side of the flange plate (4-3) of the ball nut (4) away from the ball nut body (4-2).

10. The ball screw type electric cylinder according to claim 1, wherein The needle roller plane integrated bearing (6) comprises a needle roller bearing part (6-1) and a plane bearing part (6-2); The needle roller bearing part (6-1) and the plane bearing part (6-2) are connected.

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