Compact electric cylinder with high thrust, high precision, large stroke ratio and low maintenance cost

Abstract

The utility model discloses a compact high-thrust high-precision large-stroke-ratio low-maintenance-cost electric cylinder which comprises an electric cylinder shell which comprises an electric cylinder shell front section, an electric cylinder shell middle section, an electric cylinder shell rear section and an electric cylinder shell tail section, the electric cylinder shell front section is provided with a deep groove ball bearing structure and a tapered roller bearing structure, and the electric cylinder shell rear section is provided with a tapered roller bearing structure; the middle section of the electric cylinder shell is provided with an RV cycloid hollow speed reducer structure, the rear section and the tail section of the electric cylinder shell are provided with frameless torque motor structures, the interior of the electric cylinder shell is telescopically connected with a ball screw structure, and the tapered roller bearing structure and the deep groove ball bearing structure are both connected with the ball screw structure; the deep groove ball bearing structure, the tapered roller bearing structure, the RV cycloid hollow speed reducer structure and the frameless torque motor structure are sequentially connected, the ball screw structure penetrates through the deep groove ball bearing structure, the tapered roller bearing structure, the RV cycloid hollow speed reducer structure and the frameless torque motor structure, the tail section of the electric cylinder shell is connected with the hexagonal guide rod, and the hexagonal guide rod penetrates through the ball screw structure. And the RV cycloid hollow speed reducer structure is connected with an absolute value encoder.

Description

Technical Field

[0001] The utility model relates to the fields of mechanical equipment and automation, in particular to a compact electric cylinder with high thrust, high precision, large stroke ratio and low maintenance cost. Background Art

[0002] The existing electric cylinder types can be divided into ordinary servo motor direct connection type, ordinary servo motor side mounting type and hollow servo motor and planetary ball screw combination type.

[0003] Conventional direct-coupled servo motor electric cylinders feature a standard servo motor directly connected to the rear of the cylinder body, resulting in a very long axial length and a stroke ratio of approximately 20%. This length easily limits low-lying spaces. When coupled with a coupling, torque output is further limited to the coupling's maximum torque, leading to slippage and failure if the load exceeds the limit. Furthermore, many electric cylinders lack a speed reducer, resulting in insufficient torque output and limited thrust. Adding a speed reducer further increases the length and reduces the stroke ratio.

[0004] Conventional servo motor side-mounted electric cylinders connect the servo motor to the cylinder body via a synchronous belt or gears. This structure lacks precision compared to direct-connected cylinders, and the side mounting increases the product's radial volume. Combined with the axial gear or synchronous pulley assembly, the stroke ratio is approximately 30%. Synchronous belt-driven electric cylinders have tension elasticity in the synchronous belt, resulting in insufficient rigidity and unreliable accuracy. Gear-driven electric cylinders also suffer from backlash, which also compromises accuracy. Furthermore, the radial volume increases significantly.

[0005] The disadvantage of the electric cylinder combined with a hollow servo motor and a planetary ball screw is that the matching servo motor and planetary ball screw are non-standard customized parts, there are no parallel substitutes, the maintenance cost is relatively high, and the stroke ratio is about 30%.

[0006] The above three electric cylinder structures are difficult to meet actual needs. There is an urgent need for an electric cylinder that is compact, has high thrust, large stroke ratio, high precision and low maintenance cost. Summary of the Invention

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a compact electric cylinder with high thrust, high precision, large stroke ratio and low maintenance cost, which adopts a combination of ball screw structure, RV cycloid hollow reducer structure and frameless torque motor structure to achieve a compact electric cylinder with high thrust, large stroke ratio, high precision and low cost.

[0008] To achieve the above objectives, the present invention proposes a compact electric cylinder with high thrust, high precision, large stroke ratio and low maintenance cost, comprising:

[0009] The electric cylinder housing includes a front section, a middle section, a rear section and a tail section. The front section of the electric cylinder housing is provided with a deep groove ball bearing structure and a tapered roller bearing structure. The middle section of the electric cylinder housing is provided with an RV cycloid hollow reducer structure. The rear section and the tail section of the electric cylinder housing are provided with a frameless torque motor structure. A ball screw structure is flexibly connected to the interior of the electric cylinder housing. The tapered roller bearing structure and the deep groove ball bearing structure are both connected to the ball screw structure. The tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure are connected in sequence. The ball screw structure passes through the deep groove ball bearing structure, the tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure to perform reciprocating linear motion. The tail section of the electric cylinder housing is connected to a hexagonal guide rod, which passes through the interior of the ball screw structure. The RV cycloid hollow reducer structure is fixedly connected to an absolute encoder.

[0010] Furthermore, the frameless torque motor structure includes a frameless torque motor stator, a frameless torque motor rotor, a motor lead wire and a second deep groove ball bearing. The frameless torque motor rotor is arranged inside the frameless torque motor stator, and the end of the frameless torque motor rotor is connected to the second deep groove ball bearing. The frameless torque motor rotor is connected to the motor lead wire, and the motor lead wire passes through the tail section of the electric cylinder housing and is led outward.

[0011] Furthermore, the RV cycloid hollow reducer structure includes an RV cycloid hollow reducer, a reducer connecting large ring shell and a reducer connecting small ring. The reducer connecting large ring shell and the reducer connecting small ring are both connected to the RV cycloid hollow reducer. The input end of the RV cycloid hollow reducer is connected to the frameless torque motor rotor through a first bolt, and the output end of the RV cycloid hollow reducer is connected to the reducer connecting small ring through a second bolt. The two ends of the reducer connecting large ring shell are respectively connected to the front section of the electric cylinder shell and the middle section of the electric cylinder shell, and the reducer connecting large ring shell is fixedly connected to the absolute encoder.

[0012] Furthermore, the ball screw structure includes a ball screw, a ball screw nut, a screw accordion cover, a screw end connecting block and a screw guide ring. The ball screw nut is sleeved on the surface of the ball screw, the front end of the ball screw is connected to the screw end connecting block, the screw guide ring is connected to the front end of the electric cylinder housing, and the screw accordion cover is connected between the screw end connecting block and the screw guide ring.

[0013] Furthermore, the tapered roller bearing structure includes a tapered roller bearing, a bearing fixing large ring and a bearing fixing small ring, the bearing fixing large ring and the bearing fixing small ring are both connected to the tapered roller bearing, the tapered roller bearing is connected to the ball screw nut and is symmetrically arranged, the bearing fixing large ring is connected to the ball screw nut through a third bolt, the bearing fixing small ring is connected to the ball screw nut through a fourth bolt, and the bearing fixing large ring is connected to the reducer connecting small ring through a fifth bolt.

[0014] Furthermore, the deep groove ball bearing structure includes a second deep groove ball bearing and a shaft retaining ring, and the second deep groove ball bearing and the shaft retaining ring are both connected to the ball screw.

[0015] Furthermore, a front spacer and a middle spacer are provided inside the electric cylinder housing. The front spacer is provided between the second deep groove ball bearing and the shaft retaining ring and is connected to the ball screw nut. The middle spacer is positioned on the outer ring of the tapered roller bearing.

[0016] Furthermore, the absolute value encoder is also connected to an encoder lead wire, and the encoder lead wire passes through the middle section of the electric cylinder housing and is led outward.

[0017] Furthermore, the ball screw is internally connected to the hexagonal guide rod, and the hexagonal guide rod is connected to the rear section of the electric cylinder housing through a sixth bolt.

[0018] Compared with the prior art, an embodiment disclosed in the present invention has the following beneficial effects:

[0019] (1) A combination of ball screw structure, RV cycloid hollow reducer structure and frameless torque motor structure is adopted. The main body of RV cycloid hollow reducer and frameless torque motor are both hollow through-type. The screw can pass through the motor and reducer body. The screw stroke can almost pass through the entire electric cylinder without increasing the axial length of the electric cylinder. While ensuring the compactness of the electric cylinder, the stroke ratio can reach more than 40%.

[0020] (2) This electric cylinder is equipped with a frameless torque motor and an RV cycloid hollow reducer. Compared with ordinary servo motors of the same frame size, the output torque of this motor is generally increased by about 20%. In addition, the instantaneous output torque of the RV cycloid hollow reducer is more than 4 times the rated torque, while the instantaneous output torque of the ordinary planetary reducer is 2-3 times the rated torque, which provides a guarantee for large thrust;

[0021] (2) The RV cycloid hollow reducer is used, and steel balls are used as movable teeth instead of fixed gears. Through pre-loading and cycloid raceway, a seamless rolling meshing pair is formed. The zero backlash design provides a strong guarantee for high precision. The electric cylinder has a built-in ultra-thin absolute encoder to further improve the accuracy of the electric cylinder. In addition, the RV cycloid hollow reducer uses flat thrust bearings and tapered roller bearings inside to ensure high load and high overload capacity.

[0022] (4) RV cycloid hollow reducer can adopt market standard products, effectively reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an overall cross-sectional view of the electric cylinder disclosed in an embodiment of the present utility model;

[0024] Figure 2 This is an overall structural diagram of the electric cylinder disclosed in an embodiment of the present utility model in a retracted state;

[0025] Figure 3 This is an overall structural diagram of the electric cylinder disclosed in an embodiment of the utility model in the extended state.

[0026] In the figure: 11-front section of the electric cylinder housing; 12-middle section of the electric cylinder housing; 13-rear section of the electric cylinder housing; 14-tail section of the electric cylinder housing; 21-frameless torque motor stator; 22-frameless torque motor rotor; 23-motor lead wires; 24-first deep groove ball bearing; 31-ball screw; 32-ball screw nut; 33-screw accordion cover; 34-screw end connection block; 35-screw guide ring; 41-RV cycloid hollow reducer; 42-reducer connecting large ring housing; 43-reducer connecting small ring; 51-tapered roller bearing; 52-bearing fixing large ring; 53-bearing fixing small ring; 6-hexagonal guide rod; 7-absolute encoder; 71-encoder lead wires; 81-second deep groove ball bearing; 82-shaft retaining ring; 91-front spacer; 92-middle spacer. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples and accompanying drawings. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. The present invention may also be implemented or applied through other different specific examples, and the details in this specification may be modified and altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] Figure 1 This is an overall cross-sectional view of the electric cylinder disclosed in the embodiment of the present utility model. Figure 1 As shown, a compact electric cylinder with high thrust, high precision, large stroke ratio and low maintenance cost, including:

[0029] The electric cylinder housing includes a front section 11, a middle section 12, a rear section 13 and a tail section 14. The front section 11 is provided with a deep groove ball bearing structure and a tapered roller bearing structure. The middle section 12 is provided with an RV cycloid hollow reducer structure. The rear section 13 and the tail section 14 are provided with a frameless torque motor structure. The interior of the electric cylinder housing is flexibly connected to a ball screw structure. The tapered roller bearing structure and the deep groove ball bearing structure are connected to the The ball screw structure is connected, the tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure are connected in sequence, the ball screw structure passes through the deep groove ball bearing structure, the tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure to perform reciprocating linear motion, the tail section 14 of the electric cylinder housing is connected to a hexagonal guide rod 6, the hexagonal guide rod 6 passes through the inside of the ball screw structure, and the RV cycloid hollow reducer structure is fixedly connected to an absolute encoder 7.

[0030] Specifically, a deep groove ball bearing structure, a tapered roller bearing structure, an RV cycloid hollow reducer structure and a frameless torque motor structure are sequentially arranged inside the electric cylinder housing from front to back, and the ball screw structure is passed through the hollow reducer body and the motor body. The deep groove ball bearing structure and the tapered roller bearing structure are sleeved on the periphery of the ball screw structure, and a hexagonal guide rod is provided to pass through the inner side of the ball screw structure to fix the ball screw body in the axial direction, ensuring that the ball screw body performs reciprocating linear motion under the action of the motor and the reducer, while ensuring large thrust, large stroke ratio and high precision, effectively avoiding the problem of excessive axial length of the electric cylinder.

[0031] Furthermore, the frameless torque motor structure includes a frameless torque motor stator 21, a frameless torque motor rotor 22, a motor lead wire 23 and a first deep groove ball bearing 24. The frameless torque motor stator 21 is connected to the interior of the rear section 13 of the electric cylinder housing, and the frameless torque motor rotor 22 is arranged inside the frameless torque motor stator 21. The ball screw structure passes through the interior of the frameless torque motor rotor 22. The end of the frameless torque motor rotor 22 is connected to the first deep groove ball bearing 24. The first deep groove ball bearing 24 supports the frameless torque motor rotor 22. The frameless torque motor rotor 22 is connected to the motor lead wire 23, and the motor lead wire 23 passes through the rear section 14 of the electric cylinder housing and is led outward.

[0032] Furthermore, the ball screw structure includes a ball screw 31, a ball screw nut 32, a screw accordion cover 33, a screw end connection block 34 and a screw guide ring 35. The ball screw nut 32 is sleeved on the surface of the ball screw 31, the front end of the ball screw 31 is connected to the screw end connection block 34, and the screw guide ring 35 is connected to the end of the front section 11 of the electric cylinder housing. When the ball screw 31 performs telescopic movement, the screw guide ring 35 is in contact with the ball screw 31, and the screw end connection block 34 and the screw guide ring 35 are connected to the ball screw. The screw accordion cover 33 is used to prevent dust from entering the surface of the ball screw 31 and even the ball screw nut 32, effectively extending the service life of the electric cylinder. The screw guide ring 35 guides the ball screw 31, effectively improving the rigidity of the radial force. The screw guide ring 35 is made of copper alloy material with a lower hardness than the ball screw 31, which will not cause wear to the ball screw 31. When the wear of the screw guide ring 35 exceeds the precision requirements, it is easy to replace. The replacement method is as follows: remove the screw end connection block 34 and the screw accordion cover 33, and then replace it. It should be noted that the screw end connection block 34 is connected to the load moving part, and the electric cylinder housing tail section 14 is connected to the load fixed side.

[0033] A hexagonal guide rod 6 is provided inside the ball screw structure. Furthermore, the hexagonal guide rod 6 is provided inside the ball screw 31. The hexagonal guide rod 6 is connected to the tail section 14 of the electric cylinder housing through a sixth bolt. The hexagonal guide rod 6 is used to make the ball screw 31 move only in the axial direction without rotational movement, and to increase the radial rigidity of the ball screw 31.

[0034] Furthermore, the RV cycloid hollow reducer structure includes an RV cycloid hollow reducer 41, a reducer connecting large ring housing 42 and a reducer connecting small ring 43, and the reducer connecting large ring housing 42 and the reducer connecting small ring 43 are both connected to the RV cycloid hollow reducer 41; the input end of the RV cycloid hollow reducer 41 is connected to the frameless torque electronic rotor 22 through a first bolt, and the output end of the RV cycloid hollow reducer 41 is connected to the reducer connecting small ring 43 through a second bolt; the reducer connecting large ring housing 42 is fixedly connected to an absolute encoder 7; the reducer connecting large ring housing 42 connects the front section 11 of the electric cylinder housing and the middle section 12 of the electric cylinder housing, that is, the front section 11 of the electric cylinder housing, the reducer connecting large ring housing 42, the middle section 12 of the electric cylinder housing, the rear section 13 of the electric cylinder housing and the tail section 14 of the electric cylinder housing are connected in sequence. Specifically, the functions of the reducer connected to the large ring housing 42 include: first, connecting the front section 11 of the electric cylinder housing and the middle section 12 of the electric cylinder housing; second, fixing the absolute encoder 7; and third, axially pressing the tapered roller bearing 51 and the spacer sleeve 92 (see below).

[0035] Furthermore, the tapered roller bearing structure includes a tapered roller bearing 51, a bearing fixing large ring 52 and a bearing fixing small ring 53, and the bearing fixing large ring 52 and the bearing fixing small ring 53 are both connected to the tapered roller bearing 51; the tapered roller bearing 51 is connected to the ball screw nut 32 and is symmetrically arranged, the bearing fixing large ring 52 is connected to the ball screw nut 32 through a third bolt, and the bearing fixing small ring 53 is connected to the ball screw nut 32 through a fourth bolt. The function of the bearing fixing large ring 52 and the bearing fixing small ring 53 is to axially support the inner ring of the tapered ball bearing 51 to prevent the ball screw nut 32 from axially moving, and the bearing fixing large ring 52 is connected to the reducer connecting small ring 43 through a fifth bolt.

[0036] Furthermore, the deep groove ball bearing structure includes a second deep groove ball bearing 81 and a shaft retaining ring 82 , and the second deep groove ball bearing 81 and the shaft retaining ring 82 are both connected to the ball screw 31 .

[0037] Furthermore, the electric cylinder housing is internally provided with a front spacer 91 and a middle spacer 92. The front spacer 91 is positioned between the second deep groove ball bearing 81 and the shaft retaining ring 82 and is secured to the ball screw nut 32. The middle spacer 92 is positioned on the outer ring of the tapered roller bearing 51. The reducer, connected to the large ring housing 42, can axially compress the tapered roller bearing 51 and the middle spacer 92. Specifically, the electric cylinder housing front section 11, the second deep groove ball bearing 81, the front spacer 91, the shaft retaining ring 82, and the tapered roller bearing 51 are all configured to assemble and secure the ball screw 31 and the ball screw nut 32.

[0038] Furthermore, the absolute encoder 7 is connected to an encoder lead wire 71, which passes through the middle section 12 of the electric cylinder housing and is led outward. Specifically, the absolute encoder 7, encoder lead wire 71, frameless torque motor stator 21, second frameless torque motor rotor 22, and motor lead wire 23 cooperate to form a high-precision servo motor, which effectively ensures the high-precision electric cylinder.

[0039] The power transmission principle of this electric cylinder is as follows:

[0040] like Figure 1-Figure 3 As shown, the second frameless torque motor rotor 22 rotates, driving the input end of the RV cycloid hollow reducer 41 to rotate, and then driving the output end of the RV cycloid hollow reducer 41 to rotate, thereby rotating the ball screw nut 32. Because the ball screw 31 can only make forward and backward linear motion along the hexagonal guide rod 6, under the drive of the ball screw nut 32, the ball screw 31 realizes forward and backward linear motion, and performs extension and retraction actions.

[0041] The tapered roller bearings 51 are symmetrically mounted, along with the second deep groove ball bearing 81, front spacer 91, shaft retaining ring 82, and intermediate spacer 92. The reducer is connected to the large ring housing 42, ensuring that the ball screw nut 32 can maintain both axial position and radial forward and reverse rotation. Specifically, the reducer is connected to the large ring housing 42 to axially compress the outer ring of the second deep groove ball bearing 81, securing the outer ring of the second deep groove ball bearing 81 and also achieving axial fixation of its inner ring. The inner ring of the second deep groove ball bearing 81 is then connected to the ball screw 31, securing the ball screw axially. The inner ring of the bearing can rotate forward and reverse, and the ball screw nut also achieves forward and reverse rotation.

[0042] The installation sequence of this electric cylinder is as follows:

[0043] First, install the ball screw nut 32, ball screw 31, second deep groove ball bearing 81, front spacer 91, shaft retaining ring 82, bearing fixing small ring 53, middle spacer 92, bearing fixing large ring 52, tapered roller bearing 51 and reducer connecting small ring 43 into the front section 11 of the electric cylinder housing in sequence. After tightening, install the absolute encoder 7 on the reducer connecting large ring housing 42 to form a combined part, and then install this combined part on the front section 11 of the electric cylinder housing and tighten it with the hexagon socket screw.

[0044] The reducer connecting ring 43 is fixed to the output end of the RV cycloid hollow reducer 41 with a second bolt, and then the reducer connecting ring 43 is fixed to the bearing fixing large ring 52 with a fifth bolt, and the middle section 12 of the electric cylinder housing and the encoder lead wire 71 are installed, and then the rear section 13 of the electric cylinder housing is installed; the frameless torque motor stator 21 is installed into the rear section 13 of the electric cylinder housing, and the second frameless torque motor rotor 22 is installed into the input end of the RV cycloid hollow reducer 41; then the first deep groove ball bearing 24 is installed into the rear section 14 of the electric cylinder housing, and then installed together on the rear section 13 of the electric cylinder housing, and the motor lead wire 23 is pulled out at the same time.

[0045] The screw guide ring 35 is installed on the front section 11 of the electric cylinder housing, the screw accordion cover 33 is put on the exposed part of the screw, and then the screw end connecting block 34 is installed on the end of the ball screw 31. At this point, the entire electric cylinder is fully installed.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any skilled artisan may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be as set forth in the appended claims.

Claims

1. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder, characterized by: The electric cylinder comprises: An electric cylinder housing, the electric cylinder housing comprising an electric cylinder housing front section (11), an electric cylinder housing middle section (12), an electric cylinder housing rear section (13) and an electric cylinder housing tail section (14), the electric cylinder housing front section (11) being provided with a deep groove ball bearing structure and a tapered roller bearing structure, the electric cylinder housing middle section (12) being provided with an RV cycloid hollow reducer structure, the electric cylinder housing rear section (13) and the electric cylinder housing tail section (14) being provided with a frameless torque motor structure, a ball screw structure being flexibly connected inside the electric cylinder housing, the tapered roller bearing structure and the deep groove ball bearing structure being provided with a plurality of bearings. They are all connected to the ball screw structure, the tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure are connected in sequence, the ball screw structure passes through the deep groove ball bearing structure, the tapered roller bearing structure, the RV cycloid hollow reducer structure and the frameless torque motor structure to perform reciprocating linear motion, the tail section (14) of the electric cylinder housing is connected to a hexagonal guide rod (6), the hexagonal guide rod (6) passes through the interior of the ball screw structure, and the RV cycloid hollow reducer structure is fixedly connected to an absolute encoder (7).

2. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 1, characterized in that: The frameless torque motor structure comprises a frameless torque motor stator (21), a frameless torque motor rotor (22), a motor lead wire (23) and a first deep groove ball bearing (24), wherein the frameless torque motor rotor (22) is arranged inside the frameless torque motor stator (21), the end of the frameless torque motor rotor (22) is connected to the first deep groove ball bearing (24), the frameless torque motor rotor (22) is connected to the motor lead wire (23), and the motor lead wire (23) passes through the rear section (14) of the electric cylinder housing and is led outward.

3. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 2, characterized in that: The RV cycloid hollow reducer structure comprises an RV cycloid hollow reducer (41), a reducer connecting large ring housing (42) and a reducer connecting small ring (43), wherein the reducer connecting large ring housing (42) and the reducer connecting small ring (43) are both connected to the RV cycloid hollow reducer (41), an input end of the RV cycloid hollow reducer (41) is connected to the frameless torque motor rotor (22) via a first bolt, an output end of the RV cycloid hollow reducer (41) is connected to the reducer connecting small ring (43) via a second bolt, two ends of the reducer connecting large ring housing (42) are respectively connected to the front section (11) of the electric cylinder housing and the middle section (12) of the electric cylinder housing, and the reducer connecting large ring housing (42) is fixedly connected to the absolute value encoder (7).

4. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 3, characterized in that: The ball screw structure includes a ball screw (31), a ball screw nut (32), a screw accordion cover (33), a screw end connection block (34) and a screw guide ring (35), wherein the ball screw nut (32) is sleeved on the surface of the ball screw (31), the front end of the ball screw (31) is connected to the screw end connection block (34), the screw guide ring (35) is connected to the end of the front section (11) of the electric cylinder housing, and the screw accordion cover (33) is connected between the screw end connection block (34) and the screw guide ring (35).

5. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 4, characterized in that: The tapered roller bearing structure comprises a tapered roller bearing (51), a bearing fixing large ring (52) and a bearing fixing small ring (53), wherein the bearing fixing large ring (52) and the bearing fixing small ring (53) are both connected to the tapered roller bearing (51), and the tapered roller bearing (51) is connected to the ball screw nut (32) and is symmetrically arranged, wherein the bearing fixing large ring (52) is connected to the ball screw nut (32) via a third bolt, the bearing fixing small ring (53) is connected to the ball screw nut (32) via a fourth bolt, and the bearing fixing large ring (52) is connected to the reducer connecting small ring (43) via a fifth bolt.

6. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 4, characterized in that: The deep groove ball bearing structure comprises a second deep groove ball bearing (81) and a shaft retaining ring (82), and the second deep groove ball bearing (81) and the shaft retaining ring (82) are both connected to the ball screw (31).

7. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 6, characterized in that: A front spacer (91) and a middle spacer (92) are further provided inside the electric cylinder housing. The front spacer (91) is provided between the second deep groove ball bearing (81) and the shaft retaining ring (82) and is connected to the ball screw nut (32). The middle spacer (92) is positioned on the outer ring of the tapered roller bearing (51).

8. A compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 1 or 3, characterized in that: The absolute value encoder (7) is also connected to an encoder lead wire (71), and the encoder lead wire (71) passes through the middle section (12) of the electric cylinder housing and is led outward.

9. The compact, high-thrust, high-precision, high-stroke ratio, low-maintenance electric cylinder according to claim 1, characterized in that: The ball screw (31) is internally connected to the hexagonal guide rod (6), and the hexagonal guide rod (6) is connected to the rear section (14) of the electric cylinder housing via a sixth bolt.

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