Ball screw type electric cylinder

Abstract

The invention relates to a ball screw type electric cylinder, and the electric cylinder comprises a driving part which is used as a power source to drive a synchronous belt and a 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] The invention relates to the technical field of electric cylinders, and in particular to a ball screw type electric cylinder. Background Art

[0002] The electric cylinder is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the push rod. The principle of the electric cylinder is that the motor drives a pair of screw nuts after gear reduction, converting the rotational motion of the motor into linear motion. The push rod action is completed by using the forward and reverse rotation of the motor. For example, through various levers, rockers or connecting rods, complex actions such as rotation and shaking can be completed. By changing the length of the lever arm, the stroke can be increased or enlarged. The structure of the common electric cylinder is shown in Fig.14 , including a servo motor, a cylinder body and a lead screw.

[0003] At present, most of the electric cylinders on the market are used as the output force mechanical structure of the press. Most of the electric cylinders must be made longer due to technical reasons, and the position of the screw rod at the bottom is reserved, resulting in the problem that the electric cylinder is larger and longer. It cannot be used in some occasions with limited installation requirements, and if the electric cylinder is not installed or processed properly, it is easy to cause self-rotation, shaking, etc. In addition, in conventional electric cylinders, the screw rod can bear a certain weight, but its bearing capacity is limited.

[0004] In addition, due to the high precision requirements and complex structure of electric cylinders, the corresponding factory prices are also relatively expensive. Small-sized electric cylinders are generally around 1,500 to 5,000 yuan, which is not conducive to reducing costs and increasing efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a ball screw type electric cylinder in order to overcome the defects of the above-mentioned prior art. By setting structures such as needle roller plane integrated bearings and plane bearings, and using a servo motor as a power source to drive the synchronous pulley (synchronous driving wheel (first synchronous wheel) and synchronous belt) to rotate, the power is transmitted to the synchronous belt driven wheel (second synchronous wheel) to cooperate with the rotation of the ball nut with a first key pin. Due to the rotation of the ball nut, the ball screw drive can be converted from rotational motion to up and down motion, which changes the problem of high cost and complex parts of traditional electric cylinders. In addition, it changes the problem that the electric cylinder guide block is easily worn and the electric cylinder shakes after long-term durable use of the traditional electric cylinder, and can effectively improve the load-bearing capacity.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The object of the present invention is to provide a ball screw type electric cylinder, the ball screw type electric cylinder comprising:

[0008] A driving member, the driving member is used as a power source to drive the synchronous belt and the synchronous wheel to rotate; a synchronous belt, the synchronous belt is connected to the driving member; a synchronous wheel set, the synchronous wheel set is connected to the synchronous belt; a ball nut, the ball nut is connected to the synchronous wheel set; a ball screw, the ball screw is connected to the ball nut; a needle roller plane integrated bearing, the needle roller plane integrated bearing is sleeved on the outside of the ball nut; a plane bearing, the plane bearing is sleeved on the outside of the ball screw; a mounting cover, the ball screw passes through the mounting cover, and the needle roller plane integrated bearing and the plane bearing are respectively connected to the mounting cover.

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

[0010] Furthermore, the ring sleeve is a stainless steel sleeve.

[0011] Furthermore, the driving member 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 the mounting cover; and the output shaft is connected to the synchronous wheel set.

[0012] Furthermore, the synchronous wheel set includes a first synchronous wheel and a second synchronous wheel; the first synchronous wheel and the second synchronous wheel are connected by a synchronous belt; the first synchronous wheel is connected to a driving member; and the second synchronous wheel is connected to a ball nut.

[0013] Furthermore, the outer sides of the first synchronous wheel and the second synchronous wheel are respectively connected to the synchronous belt; the inner side of the first synchronous wheel is connected to the outer side of the driving member; the inner side of the second synchronous wheel 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; and the second synchronous wheel of the synchronous wheel set is provided with a key groove matching the first key pin.

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

[0016] Furthermore, the ball screw type 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; the guide shaft passes through the mounting cover.

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

[0018] Furthermore, the ball screw type electric cylinder also includes a guide sleeve; the guide sleeve is connected to the mounting cover; the guide sleeve is arranged 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 plane integrated bearing is sleeved on the outside of the ball nut body of the ball nut; the plane bearing is located on the side of the ball nut flange away from the ball nut body.

[0020] Furthermore, the needle roller and plane integrated bearing comprises a needle roller bearing portion and a plane bearing portion; the needle roller bearing portion and the plane bearing portion are connected.

[0021] This structure is powered by a servo motor, which drives the synchronous pulley (synchronous drive wheel (first synchronous wheel) and synchronous belt) to rotate, and then transmits the synchronous belt to the driven wheel (second synchronous wheel) of the synchronous belt, and then to the ball nut with the first key pin. The rotation of the ball nut drives the ball screw to move up and down, which can realize the displacement control, speed control, delay control, etc. of the up and down movement of the ball screw. The integrated needle roller plane bearing can prevent hard friction when the ball nut rotates, and the mounting block (second cover plate) can be tightly matched with the ball nut to prevent shaking. The plane bearing can reduce the friction of the up and down reaction force of the ball screw on the rotational motion, and convert the hard friction into the bearing rotational motion. The guide shaft provides stability for the ball screw to ensure that it is not easy to shake during the rising and falling process.

[0022] This structure is simple and low-priced, only one-third of the cost of ordinary electric cylinders (with complex and many parts), and has a compact structure without a narrow and long electric cylinder housing cavity. By changing the motion structure of the ball screw and the ball nut, a narrow and long cavity is saved compared to the existing electric cylinder solution, the volume is reduced by two-thirds, a circular optical axis column is saved, and parts and processed parts are greatly reduced, with lower costs, smaller space, and easy use.

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

[0024] 1) The technical solution provides a ball screw type electric cylinder, which is powered by a servo motor, driving the synchronous pulley (synchronous driving wheel (first synchronous wheel) and synchronous belt) to rotate through the synchronous belt to the synchronous belt driven wheel (second synchronous wheel), and then to the ball nut with a 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 technical solution provides a ball screw type electric cylinder, which is equipped with structures such as a needle roller plane integrated bearing and a plane bearing. The needle roller plane integrated bearing can prevent hard friction when the ball nut rotates, and the plane bearing can reduce the friction of the up and down reaction force of the ball screw on the rotational motion, and convert the hard friction into bearing rotational motion. This changes the problem of the traditional electric cylinder that the electric cylinder guide block is easily worn and the electric cylinder shakes after long-term durable use. It is not easy to shake during the rising and falling process, and compared with the round bearing that is subjected to excessive force and causes the bearing marble to fall off, it can effectively improve the load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the ball screw electric cylinder in Example 1 of the present invention.

[0027] Figure 2 Schematic top view of the ball screw type electric cylinder in Example 1 of the present invention.

[0028] Figure 3 It is a front schematic diagram of the ball screw type electric cylinder in Example 1 of the present invention.

[0029] Figure 4 It is a cross-sectional schematic diagram of the ball screw type electric cylinder in Example 1 of the present invention.

[0030] Figure 5 Schematic diagram of the structure of the ball screw electric cylinder in Example 3 of the present invention.

[0031] Figure 6 It is an exploded view of the ball screw type electric cylinder in Example 1 of the present invention.

[0032] Figure 7 The structure of the electric cylinder cover of the ball screw type electric cylinder in the embodiment 1 of the present invention is shown in FIG. Figure 1 .

[0033] Figure 8 The structure of the electric cylinder cover of the ball screw type electric cylinder in the embodiment 1 of the present invention is shown in FIG. Figure 2 .

[0034] Fig. 9 Schematic diagram of the structure of the ball screw type electric cylinder in Example 1 of the present invention (partial perspective).

[0035] Fig.10 Schematic top view (partial perspective) of the ball screw type electric cylinder in Example 1 of the present invention.

[0036] Fig.11 It is a front schematic diagram (partial perspective) of the ball screw type electric cylinder in Example 2 of the present invention.

[0037] Fig.12It is a front schematic diagram of the ball screw type electric cylinder in the embodiment 2 of the present invention (partially perspective and without showing the complete lower limit block and upper limit block).

[0038] Fig.13 It is a partial schematic diagram (partial perspective) of the ball screw type electric cylinder in Example 1 of the present invention.

[0039] Fig.14 It is a schematic diagram of the structure of an existing common electric cylinder.

[0040] Fig.15 It is a front schematic diagram (partial perspective) of the ball screw type electric cylinder in Example 1 of the present invention.

[0041] Fig.16 It is a partial perspective view of the ball screw type electric cylinder in embodiment 1 of the present invention.

[0042] Numbers in the figure:

[0043] 1. Servo motor, 1-1. Motor body, 1-2. Output shaft, 1-3. Second key pin, 2. Synchronous belt, 3. Synchronous wheel, 3-1. First synchronous wheel, 3-2. Second synchronous wheel, 4. Ball nut, 4-1. First key pin, 4-2. Ball nut body, 4-3. Flange, 5. Ball screw, 6. Needle roller plane integrated bearing, 6-1. Needle roller bearing part, 6-2. Plane bearing part, 7. Plane 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 DESCRIPTION

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

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] The present invention is further described in detail below in conjunction with specific embodiments.

[0048] Example 1

[0049] like Figures 1 to 4 , 6-10, 15-16, a ball screw type electric cylinder, the ball screw type electric cylinder comprises:

[0050] Driving parts, synchronous belt 2, synchronous wheel set 3, ball nut 4, ball screw 5, needle roller plane integrated bearing 6, plane bearing 7, mounting cover 8, electric cylinder upper cover 9, lower limit block 10, guide shaft 11, guide sleeve 12, ring sleeve 17.

[0051] The driving member is used as a power source to drive the synchronous belt 2 and the synchronous wheel 3 to rotate; the synchronous belt 2, the synchronous belt 2 is connected to the driving member; the synchronous wheel set 3, the synchronous wheel set 3 is connected to the synchronous belt 2; the ball nut 4, the ball nut 4 is connected to the synchronous wheel set 3; the ball screw 5, the ball screw 5 is connected to the ball nut 4; the needle roller plane integrated bearing 6, the needle roller plane integrated bearing 6 is sleeved on the outside of the ball nut 4; the plane bearing 7, the plane bearing 7 is sleeved on the outside of the ball screw 5, the ring sleeve 17 is sleeved on the outside of the ball screw 5, one section of the ring sleeve 17 is arranged between the ball screw 5 and the plane bearing 7, and the other section of the ring sleeve 17 passes through the second cover plate 8-2 of the mounting cover 8; the mounting cover 8, the ball screw 5 passes through the mounting cover 8, and the needle roller plane integrated bearing 6 and the plane 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 may be hexagon socket screws; the output shaft 1-2 is connected to the synchronous wheel set 3.

[0053] The synchronous wheel group 3 includes a first synchronous wheel 3-1 and a second synchronous wheel 3-2, wherein the first synchronous wheel 3-1 is a synchronous belt driving wheel, and the second synchronous wheel 3-2 is a synchronous belt driven wheel; the first synchronous wheel 3-1 and the second synchronous wheel 3-2 are connected by a synchronous belt 2, and the rotation of the first synchronous wheel 3-1 drives the rotation of the synchronous belt 2, thereby driving the rotation of the second synchronous wheel 3-2; the first synchronous wheel 3-1 is connected to a driving member, specifically, the first synchronous wheel 3-1 is connected to an output shaft 1-2 of a servo motor 1, and the rotation of the output shaft 1-2 of the servo motor 1 drives the rotation of the first synchronous wheel 3-1; the second synchronous wheel 3-2 is connected to a ball nut 4, and the rotation of the second synchronous wheel 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 key slot matching the second key pin 1-3, so that the rotation of the output shaft 1-2 drives the rotation of the first synchronous wheel 3-1 through the matching of the second key pin 1-3 and the key slot.

[0055] The outer sides of the first synchronous wheel 3-1 and the second synchronous wheel 3-2 are connected to the synchronous belt 2 respectively; the inner side of the first synchronous wheel 3-1 is connected to the outer side of the driving member; the inner side of the second synchronous wheel 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 key slot matching the first key pin 4-1, and the rotation of the second synchronous wheel 3-2 drives the rotation of the ball nut 4 through the matching of the first key pin 4-1 and the key slot.

[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 electric cylinder upper cover 9 and the first cover plate 8-1 of the mounting cover 8 are connected by screws, which can be hexagon socket screws; the ball screw 5 runs through the electric cylinder upper cover 9 and the mounting cover 8, and 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 electric cylinder upper cover 9 and the mounting cover 8. The first cavity and the second cavity are connected, the needle roller plane integrated bearing 6 and the plane bearing 7 are both arranged in the first cavity, the ball nut 4 is arranged in the first cavity and the second cavity, and the synchronous belt 2, the first synchronous wheel 3-1 and the second synchronous wheel 3-2 are all arranged in the second cavity.

[0058] The outer ring of the needle roller plane integrated bearing 6 and the outer ring of the plane bearing 7 are both tightly matched (interference fit) with the inner wall of the second cover plate 8-2. The inner ring of the needle roller plane integrated bearing 6 is tightly matched (interference fit) with the ball screw 5. The diameter of the inner ring of the plane bearing 7 is larger than the outer diameter of the ball screw 5. In this embodiment, the diameter of the inner ring of the plane 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 plane bearing 7 and the outer ring of the ring sleeve 17, and there is a gap between the outer ring of the ring sleeve 17 and the plane bearing 7. The bottom surface of the plane 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 and the wall surface of the through hole of the second cover plate 8-2 of the mounting cover 8 are tightly matched. The inner ring of the ring sleeve 17 and the outer diameter of the ball screw 5 match. The ball screw 5 can move up and down relative to the ring sleeve 17, but the left and right shaking 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 for the ball screw 5 to ensure that it is not easy to shake 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 is connected to the ball nut body 4-2; the needle roller plane integrated bearing 6 is sleeved on the outside of the ball nut body 4-2 of the ball nut 4; the plane 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 plane integrated bearing 6 comprises a needle roller bearing portion 6-1 and a plane bearing portion 6-2; the needle roller bearing portion 6-1 and the plane bearing portion 6-2 are integrally connected to form a whole.

[0062] The ring sleeve 17 is a stainless steel sleeve.

[0063] Example 2

[0064] like Fig.11 , 12 As shown, a ball screw type electric cylinder, based on Example 1, the ball screw type electric cylinder 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 arranged on the side surfaces of both ends of the ball screw 5 .

[0066] The upper limit block 15 is provided with a through hole matching the upper limit block hole 13 , and the connecting shaft passes through the through hole of the upper limit block 15 and is connected 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 matching the lower limit block hole 14 , and the connecting shaft passes through the through hole of the lower limit block hole 14 and is connected 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 type electric cylinder, based on embodiment 1, the ball screw type electric cylinder also 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 to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A ball screw type electric cylinder, characterized in that: The ball screw type electric cylinder comprises: A driving member, the driving member is used as a power source to drive the synchronous belt (2) and the synchronous wheel (3) to rotate; A synchronous belt (2), wherein the synchronous belt (2) is connected to a driving member; A synchronous wheel set (3), wherein the synchronous wheel set (3) is connected to the synchronous belt (2); A ball nut (4), wherein the ball nut (4) is connected to the synchronous wheel set (3); A ball screw (5), wherein the ball screw (5) is connected to the ball nut (4); A needle roller plane integrated bearing (6), wherein the needle roller plane integrated bearing (6) is sleeved on the outside of the ball nut (4); A plane bearing (7), wherein the plane bearing (7) is sleeved on the outside of the ball screw (5); The mounting cover (8) is provided, the ball screw (5) passes through the mounting cover (8), and the needle roller plane integrated bearing (6) and the plane bearing (7) are respectively connected to the mounting cover (8).

2. A ball screw type electric cylinder according to claim 1, characterized in that: 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 to the motor body (1-1); The motor body (1-1) is connected to the mounting cover (8); The output shaft (1-2) is connected to a synchronous wheel set (3).

3. The ball screw type electric cylinder according to claim 1, characterized in that: 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 via a synchronous belt (2); The first synchronous wheel (3-1) is connected to a driving member; The second synchronous wheel (3-2) is connected to the ball nut (4).

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

5. The ball screw type electric cylinder according to claim 3, characterized in that: 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 key groove matching the first key pin (4-1).

6. The ball screw type electric cylinder according to claim 1, characterized in that: The ball screw type electric cylinder also includes an electric cylinder upper cover (9); The electric cylinder upper cover (9) is connected to the mounting cover (8); The ball screw (5) passes through the electric cylinder upper cover (9) and the mounting cover (8).

7. The ball screw type electric cylinder according to claim 1, characterized in that: The ball screw type electric cylinder also includes a lower limit block (10) and a guide shaft (11); 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).

8. The ball screw type electric cylinder according to claim 7, characterized in that: The ball screw type electric cylinder also includes a guide sleeve (12); 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).

9. The ball screw type electric cylinder according to claim 1, characterized in that: The ball nut (4) comprises a flange (4-3) and a ball nut body (4-2); The flange (4-3) is connected to the ball nut body (4-2); The needle roller plane integrated bearing (6) is sleeved on the outside of the ball nut body (4-2) of the ball nut (4); The plane bearing (7) is located on a side of the flange (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, characterized in that: The needle roller plane integrated bearing (6) comprises a needle roller bearing portion (6-1) and a plane bearing portion (6-2); The needle bearing part (6-1) and the plane bearing part (6-2) are connected.

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