Electric setting tool speed reducer for oil and gas well

Abstract

The utility model relates to an electric setting tool speed reducer for an oil and gas well, which comprises a speed reducer shell, a plurality of stages of planetary speed reducers are arranged in the speed reducer shell, any stage of planetary speed reducer comprises a sun gear, a plurality of planetary gears and a rotating arm which are in transmission connection, and the sun gear is meshed with the planetary gears; a gear ring is arranged on the inner wall of the speed reducer shell, and the planet wheel is installed on the rotating arm and meshed with the gear ring. The rotating arm is rotationally mounted on the speed reducer shell through a bearing; the end, close to the upper-stage rotating arm, of any stage of sun gear is a connecting end, a connecting hole is formed in the upper-stage rotating arm, the connecting end is inserted into the connecting hole and abuts against the upper-stage rotating arm, and the end, away from the upper-stage rotating arm, of the sun gear abuts against the corresponding stage of rotating arm. An involute external spline is arranged on the outer wall of the connecting end, and an involute internal spline meshed with the involute external spline is arranged on the inner wall of the connecting hole; according to the utility model, the requirement on the machining precision of parts is lower, the parts are easier to machine and assemble, the production time is shorter, and the production efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well perforation, in particular to a speed reducer for an electric setting tool for oil and gas wells. Background Art

[0002] When oil and gas wells are being mined, a bridge plug is required to achieve interlayer isolation. An electric setting tool can be used to drive the bridge plug to achieve this. The power source of the electric setting tool is a connected motor and reducer. In the prior art, the reducer is a multi-stage planetary reducer, whose function is to increase the output torque of the motor to meet the input requirements of the electric setting tool. Each stage of the planetary reducer includes a sun gear, multiple planetary gears, and a rotating arm that are sequentially connected in a transmission manner. The inter-stage connection of the multi-stage planetary reducer has high coaxiality requirements. In the prior art, the rotating arm of each stage is an integrally machined part with the sun gear of the next stage. In order to meet the high coaxiality requirements between the sun gear and the rotating arm on the part, the part needs to have high machining accuracy, which is difficult to machine. At the same time, the part is large in size and weight, and is not easy to assemble. As a result, the existing reducer has a long production time, low production efficiency, and high cost. Utility Model Content

[0003] The purpose of the utility model is to provide an electric setting tool reducer for oil and gas wells to solve the problems of difficult processing and assembly of parts, long production hours and low efficiency in the prior art electric setting tool reducer.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A reducer for an electric sealing tool for oil and gas wells comprises a reducer housing, wherein a multi-stage planetary reducer is arranged in the reducer housing, wherein the planetary reducer of any stage comprises a sun gear, a plurality of planetary gears and a swing arm which are connected in a transmission manner, and the sun gear is meshed with the planetary gears; a ring gear is provided on the inner wall of the reducer housing, and the planetary gears are mounted on the swing arm and meshed with the ring gear; the swing arm is rotatably mounted on the reducer housing through a bearing; the end of the sun gear of any stage which is close to the swing arm of the previous stage is a connecting end, and a connecting hole is provided on the swing arm of the previous stage, and the connecting end is inserted into the connecting hole and abuts against the swing arm of the previous stage, and the end of the sun gear which is away from the swing arm of the previous stage abuts against the swing arm of the current stage; an involute external spline is provided on the outer wall of the connecting end, and an involute internal spline which meshes with the connecting end is provided on the inner wall of the connecting hole.

[0006] The utility model adopts the above-mentioned technical solution, by setting the sun gear of any stage and the rotating arm of the previous stage as a split structure, the rotating arms of the current stage and the previous stage respectively abut the two ends of the sun gear, thereby limiting the axial position of the sun gear; the sun gear and the rotating arm of the previous stage are connected by an involute spline, and the rotating arm of the previous stage can drive the sun gear to rotate. In the transmission state, the involute spline will generate a radial component of force on the key teeth, so that it has the characteristic of automatic centering, thereby ensuring the coaxiality of the transmission. Therefore, even if the coaxiality of the sun gear and the rotating arm of the previous stage after assembly is relatively low, the centering characteristic of the involute spline can be relied on to ensure the transmission. The two have a higher coaxiality in this state; therefore, the coaxiality requirement for the assembly of the sun gear and the upper-stage arm is reduced, thereby reducing the processing accuracy requirement for the parts; at the same time, the parts of the split structure are small in size and light in weight, and are easier to assemble. Compared with the problems of difficult processing and assembly of parts in the electric sealing tool reducer in the prior art, long production hours and low efficiency, the reducer of the utility model has lower processing accuracy requirements for parts while meeting the coaxiality requirements of the inter-stage transmission, and the parts are easier to process, small in size and light in weight, easier to assemble, shorter production hours and higher production efficiency.

[0007] Furthermore, the reducer housing includes an outer cylinder, and an input flange and an output flange respectively installed at both ends of the outer cylinder. The end of the sun gear of the first-stage planetary reducer away from the output flange is the input end, and the motor input shaft can pass through the center hole of the input flange to be connected to the input end; the end of the rotating arm of the last-stage planetary reducer away from the input flange is the output end, and the output end extends outward from the center hole of the output flange; the reducer housing has a simple structure; the motor is input from the input end, and the torque is increased by the multi-stage planetary reducer and output from the output end.

[0008] Furthermore, the outer cylinder includes at least two cylinders fixedly connected in sequence along the axial direction; the outer cylinder is long in size and difficult to be processed and formed as a whole, so the outer cylinder is formed by manufacturing multiple shorter cylinders fixedly connected to facilitate production and manufacturing.

[0009] Furthermore, a threaded surface, an assembly surface and an annular step are sequentially provided on the rotating arm of any stage of the planetary reducer, and a bearing sleeve is connected to the threaded surface. The inner ring of the bearing of this stage is installed on the assembly surface with an interference fit, and the end faces of the inner ring are respectively in contact with the bearing sleeve and the annular step; a limiting member for axially limiting the bearing is fixedly provided on the inner wall of the reducer housing, and the limiting member is provided with an annular groove, and the outer ring of the bearing is embedded in the annular groove; the axial position of the inner ring and the outer ring of the bearing is limited by the above structure, thereby improving its structural stability and increasing the impact resistance of the bearing.

[0010] Furthermore, a plurality of pin holes evenly distributed around the circumference are provided on the rotating arm of any stage of the planetary reducer, and the number of the pin holes is the same as the number of the planetary gears of this stage, and also includes pins corresponding to the pin holes one by one; one end of any pin is inserted into the corresponding pin hole and abuts against the rotating arm, and the other end extends out of the pin hole and is axially limited by a retaining ring; the planetary gear is rotatably sleeved on one end of the pin extending out of the pin hole.

[0011] Furthermore, a bearing is provided between the planetary gear and the pin shaft.

[0012] Furthermore, a total of four-stage planetary reducers are provided in the reducer housing; the use of a four-stage planetary reducer is sufficient to increase the torque of the motor to meet the input requirements of the electric setting tool.

[0013] Compared with the existing technology, the beneficial effects of the present invention are as follows: under the premise of meeting the coaxiality requirements of inter-stage transmission, the reducer has lower requirements on the processing accuracy of parts, the parts are easier to process, the parts are small in size and light in weight, easier to assemble, the production time is shorter, and the production efficiency is higher; the axial limitation of the inner and outer rings of the bearing improves its structural stability and increases the impact resistance of the bearing; the bearing rotating body of a single stage in the multi-stage planetary reducer only bears the impact force brought by the mass of this stage, and the impact force is not transmitted to the bearing rotating bodies of the remaining stages, thereby realizing impact isolation between stages, and the reducer has strong overall impact resistance and can be used in environments with perforation impact in oil and gas wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the four-stage reducer assembly;

[0016] Figure 3 It is a schematic diagram of the structure of the three-stage reducer assembly;

[0017] Figure 4 It is a structural diagram of the secondary reducer assembly;

[0018] Figure 5 This is a schematic diagram of the structure of the first-stage reducer assembly.

[0019] Markings in the figure: 1-seal ring, 2-output flange, 3-first radial screw, 4-fourth-stage reducer assembly, 5-first cylinder, 6-third-stage bearing seat, 7-third-stage reducer assembly, 8-third-stage gear ring screw sleeve, 9-second radial screw, 10-third radial screw, 11-second-stage reducer assembly, 12-first-stage reducer assembly, 13-second cylinder, 14-fourth radial screw, 15-input flange, 41-fourth-stage swing arm, 42-fourth-stage bearing screw sleeve, 43-first bearing, 44-second bearing, 45-fourth-stage bearing ring, 46-washer, 47-fourth-stage pin shaft, 48-fourth-stage planetary gear, 49-fourth-stage pin shaft retaining ring, 71-fourth-stage sun gear, 72-third-stage swing arm, 73-third-stage bearing screw sleeve, 74-third bearing, 75-third-stage bearing liner, 76-fourth Bearing, 77-third-stage planetary gear, 78-third-stage ring gear, 79-third-stage pin shaft retaining ring, 710-third-stage pin shaft, 111-third-stage sun gear, 112-secondary swing arm, 113-secondary bearing sleeve, 114-fifth bearing, 115-secondary bearing liner, 116-sixth bearing, 117-secondary planetary gear, 118-secondary pin shaft, 119-secondary pin shaft retaining ring, 1110-seventh bearing, 121-secondary sun gear, 122-first-stage swing arm, 123-first-stage pin shaft retaining ring, 124-first-stage pin shaft, 125-first-stage planetary gear, 126-eighth bearing, 127-ninth bearing, 128-first-stage bearing liner, 129-tenth bearing, 1210-first-stage bearing sleeve, 1211-first-stage screw plug, 1212-first-stage sun gear, 1213-retaining ring. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings.

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] The present embodiment provides a reducer for an electric sealing tool for oil and gas wells, comprising a reducer housing, wherein a four-stage planetary reducer is arranged in the reducer housing, wherein the planetary reducer of any stage comprises a sun gear, a plurality of planetary gears and a swing arm connected in a transmission manner, and the sun gear meshes with the planetary gears; a ring gear is provided on the inner wall of the reducer housing, and the planetary gears are mounted on the swing arm and meshed with the ring gear; the swing arm is rotatably mounted on the reducer housing through a bearing; an end of the sun gear of any stage close to the swing arm of the previous stage is a connecting end, a connecting hole is provided on the swing arm of the previous stage, the connecting end is inserted into the connecting hole and abuts against the swing arm of the previous stage, and an end of the sun gear away from the swing arm of the previous stage abuts against the swing arm of the current stage; an involute external spline is provided on the outer wall of the connecting end, and an involute internal spline meshing with the spline is provided on the inner wall of the connecting hole;

[0023] It should be noted that this embodiment is described using a four-stage planetary reducer as an example, but this does not mean that it is limited to a four-stage planetary reducer. Other multi-stage planetary reducers are also acceptable, such as three-stage, five-stage, etc.

[0024] The rotating arm of any one-stage planetary reducer is provided with a threaded surface, an assembly surface, and an annular step in sequence. The threaded surface is connected to a bearing sleeve. The inner ring of the bearing of this stage is installed on the assembly surface with an interference fit. The end faces of the inner ring are respectively in contact with the bearing sleeve and the annular step. A stopper for axially limiting the bearing is fixedly provided on the inner wall of the reducer housing. The stopper is provided with an annular groove, and the outer ring of the bearing is embedded in the annular groove.

[0025] The rotating arm of any one-stage planetary reducer is provided with a plurality of pin holes evenly distributed around the circumference, the number of the pin holes being the same as the number of the planetary gears of the same stage, and also including pins corresponding to the pin holes one by one; one end of any pin is inserted into the corresponding pin hole and abuts against the rotating arm, and the other end extends out of the pin hole and is axially limited by a retaining ring; the planetary gear is rotatably sleeved on the end of the pin extending out of the pin hole; a bearing can be provided between the planetary gear and the pin; as long as the planetary gear and the pin are relatively rotatable, there is no restriction on the provision of a bearing;

[0026] A four-stage planetary reducer is provided in the reducer housing, including a first-stage reducer assembly 12, a second-stage reducer assembly 11, a third-stage reducer assembly 7, and a fourth-stage reducer assembly 4;

[0027] The reducer housing includes an outer cylinder, and an input flange 15 and an output flange 2 respectively mounted at both ends of the outer cylinder. The end of the sun gear of the first-stage planetary reducer away from the output flange 2 is the input end, and the motor input shaft can pass through the center hole of the input flange 15 to connect to the input end; the end of the rotating arm of the last-stage planetary reducer away from the input flange 15 is the output end, and the output end extends outward from the center hole of the output flange 2.

[0028] The outer cylinder includes at least two cylinders fixedly connected in sequence along the axial direction; in this embodiment, it includes a first cylinder 5 and a second cylinder 13; a four-stage gear ring is integrally formed on the inner wall of the first cylinder 5, and a two-stage gear ring is integrally formed on the inner wall of the second cylinder 13;

[0029] like Figure 1-5 As shown, the four-stage reducer assembly 4 is axially constrained by the four-stage ring gear step on the first cylinder 5 and the right end face of the output flange 2. The output flange 2 and the first cylinder 5 are connected by the first radial screw 3. The sealing ring 1 is placed between the output shaft of the four-stage reducer assembly 4 and the output flange 2.

[0030] The three-stage reducer assembly 7 is axially constrained by the three-stage bearing seat 6 and the left end face of the three-stage gear ring screw sleeve 8, and the three-stage gear ring screw sleeve 8 is fixed to the first cylinder 5 by the second radial screw 9;

[0031] The secondary reducer assembly 11 is axially constrained by the tertiary gear ring nut 8 and the left end face of the secondary gear ring gear on the second cylinder 13. The tertiary gear ring nut 8 is fixed to the second cylinder 13 by a third radial screw 10.

[0032] The primary reducer assembly 12 is axially constrained by the right end face of the secondary ring gear and the left end face of the input flange 15. The second cylinder 13 is fixed to the input flange 15 by a fourth radial screw 14. The secondary reducer assembly 11 and the primary reducer assembly 12 share the secondary ring gear.

[0033] The characteristics of the four-stage reducer assembly 4 are as follows:

[0034] The inner rings of the first and second bearings 43 and 44 are mounted in series on the assembly surface of the fourth-stage rotating arm 41. The fourth-stage bearing sleeve 42 and the annular step of the fourth-stage rotating arm 41 together form an axial constraint for the inner rings of the first and second bearings 43 and 44. The outer rings of the first and second bearings 43 and 44 are placed in the stepped hole of the fourth-stage bearing ring 45. The fourth-stage bearing ring 45 and the output flange 2 form a limiter for the outer rings of the first and second bearings 43 and 44.

[0035] The fourth-stage planetary gear 48 is placed on the fourth-stage pin shaft 47, and the fourth-stage pin shaft 47 is placed in the pin shaft hole of the fourth-stage rotating arm 41. One end of the fourth-stage pin shaft 47 is constrained by the fourth-stage rotating arm 41, and the other end is constrained by the fourth-stage pin shaft retaining ring 49. The fourth-stage pin shaft retaining ring 49 is fixed by the retaining ring groove on the fourth-stage pin shaft 47, and the washer 46 is placed in the hole of the fourth-stage rotating arm 41.

[0036] The characteristics of the three-stage reducer assembly 7 are as follows:

[0037] The inner ring of the third bearing 74 is placed on the assembly surface of the third-stage swing arm 72. The third-stage bearing screw sleeve 73 and the annular step of the third-stage swing arm 72 jointly constrain the axial displacement of the inner ring of the third bearing 74. The fourth-stage sun gear 71 is placed in the connecting hole of the third-stage swing arm 72, with one end free and the other end axially constrained. The fourth-stage sun gear 71 and the third-stage swing arm 72 are separately arranged; an involute external spline is provided on the outer wall of the connecting end of the fourth-stage sun gear 71, and an involute internal spline is provided on the inner wall of the hole of the third-stage swing arm 72, that is, the fourth-stage sun gear 71 and the third-stage swing arm 72 are connected by an involute spline; after the third-stage reducer assembly 7 is assembled into the reducer housing, the free end of the fourth-stage sun gear 71 abuts on the fourth-stage swing arm 41;

[0038] One end of the tertiary bearing liner 75 contacts the outer ring of the third bearing 74, and the other end contacts one end surface of the tertiary gear ring 78. The tertiary gear ring 78 is fixed to the inner wall of the reducer housing. The tertiary bearing liner 75 and the tertiary bearing seat 6 form a limiter for the outer ring of the third bearing 74.

[0039] The third-stage pin 710 is placed in the pin hole of the third-stage rotating arm 72. The third-stage pin 710 is constrained from axial displacement by the third-stage pin retaining ring 79. The third-stage pin retaining ring 79 is placed in the retaining ring groove formed by the third-stage pin 710 and the third-stage rotating arm 72.

[0040] The third-stage planetary gear 77 is placed on the third-stage pin shaft 710, and a fourth bearing 76 is provided between the third-stage planetary gear 77 and the third-stage pin shaft 710;

[0041] The features of the secondary reducer assembly 11 are as follows:

[0042] The inner ring of the fifth bearing 114 is placed on the assembly surface of the secondary swing arm 112, and the secondary bearing screw sleeve 113 and the annular step of the secondary swing arm 112 jointly constrain the axial displacement of the inner ring of the bearing 114. The tertiary sun gear 111 is placed in the connecting hole of the secondary swing arm 112, with one end free and the other end axially constrained. The tertiary sun gear 111 and the secondary swing arm 112 are separately arranged; an involute external spline is provided on the outer wall of the connecting end of the tertiary sun gear 111, and an involute internal spline is provided on the inner wall of the hole of the secondary swing arm 112, that is, the tertiary sun gear 111 and the secondary swing arm 112 are connected by an involute spline; when the secondary reducer assembly 11 is assembled into the reducer housing, the free end of the tertiary sun gear 111 abuts against the tertiary swing arm 72;

[0043] The secondary bearing liner 115 is placed between the fifth bearing 114 and the secondary rotating arm 112; the secondary bearing liner 115 and the third gear ring screw sleeve 8 form a limiter for the outer ring of the fifth bearing 114;

[0044] The secondary pin 118 is placed in the pin hole of the secondary rotating arm 112. The pin 118 is constrained from axial displacement by the secondary pin retaining ring 119. The secondary pin retaining ring 119 is placed in the retaining ring groove formed by the secondary pin 118 and the secondary rotating arm 112.

[0045] The secondary planetary gear 117 is placed on the secondary pin 118, and a seventh bearing 1110 is provided between the secondary planetary gear 117 and the secondary pin 118;

[0046] The sixth bearing 116 is placed in the bearing hole of the secondary rotating arm 112;

[0047] The features of the first stage reducer assembly 12 are as follows:

[0048] The inner ring of the ninth bearing 127 is placed on the assembly surface of the first-stage rotating arm 122. The first-stage bearing screw sleeve 1210 and the annular step of the first-stage rotating arm 122 jointly constrain the axial displacement of the inner ring of the ninth bearing 127. The outer ring of the ninth bearing 127 is placed in the hole of the first-stage bearing liner 128. The first-stage bearing liner 128 and the input flange 15 form a limiter for the outer ring of the ninth bearing 127. The second-stage sun gear 121 is placed in the connecting hole of the first-stage rotating arm 122, with one end free and the other end axially constrained. It is separately provided with the primary arm 122; an involute external spline is provided on the outer wall of the connection end of the secondary sun gear 121, and an involute internal spline is provided on the inner wall of the hole of the primary arm 122, that is, the secondary sun gear 121 and the primary arm 122 are connected by the involute spline; when the primary reducer assembly 12 is assembled into the reducer housing, the free end of the secondary sun gear 121 abuts against the secondary arm 112, specifically, the free end is inserted into the sixth bearing 116, and the sixth bearing 116 is used to limit the axial position;

[0049] The primary pin 124 is placed in the pin hole of the primary rotating arm 122. The primary pin 124 is constrained from axial displacement by the primary pin retaining ring 123. The primary pin retaining ring 123 is placed in the retaining ring groove formed by the primary pin 124 and the primary rotating arm 122.

[0050] The first-stage planetary gear 125 is placed on the first-stage pin 124 , and an eighth bearing 126 is provided between the first-stage planetary gear 125 and the first-stage pin 124 ;

[0051] The first-stage sun gear 1212 is connected to the inner ring of the tenth bearing 129, and the axial displacement is restrained by the first-stage screw plug 1211 and the upper step of the first-stage sun gear 1212;

[0052] The outer ring of the tenth bearing 129 is placed in the outer ring hole of the first-stage rotating arm 122. A retaining ring 1213 is provided at one end of the outer ring hole of the bearing to restrict the axial displacement of the bearing 129.

[0053] The utility model adopts the above-mentioned technical solution, by setting the sun gear of any stage and the rotating arm of the previous stage as a split structure, the rotating arms of this stage and the previous stage respectively abut the two ends of the sun gear, thereby limiting the axial position of the sun gear; the sun gear and the rotating arm of the previous stage are connected by an involute spline, and the rotating arm of the previous stage can drive the sun gear to rotate. In the transmission state, the involute spline will generate a radial component of force on the key teeth, so that it has the characteristic of automatic centering, thereby ensuring the coaxiality of the transmission. Therefore, even if the coaxiality of the sun gear and the rotating arm of the previous stage after assembly is relatively low, the centering characteristic of the involute spline can be relied upon to ensure a higher coaxiality between the two in the transmission state; therefore, the coaxiality requirement of the assembly of the sun gear and the rotating arm of the previous stage is reduced, thereby reducing the processing accuracy requirement of the parts; at the same time, the parts of the split structure are small in size. , small weight, easier to assemble, compared with the problems of difficult processing and assembly of internal parts of the electric sealing tool reducer in the prior art, long production time and low efficiency, the reducer of the utility model has lower requirements on the processing accuracy of parts while meeting the coaxiality requirements of inter-stage transmission, and the parts are easier to process, small in size and weight, easier to assemble, shorter production time and higher production efficiency; at the same time, the axial limitation of the inner and outer rings of the bearing improves its structural stability and increases the impact resistance of the bearing; the bearing rotating body of a single stage in the multi-stage planetary reducer only bears the impact force brought by the mass of this stage, and the impact force is not transmitted to the bearing rotating bodies of the other stages, thereby realizing impact isolation between stages, and the reducer has strong overall impact resistance and can be used in environments with perforation impact in oil and gas wells.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reducer for an electric setting tool for oil and gas wells, comprising a reducer housing, a multi-stage planetary reducer disposed within the reducer housing, each stage of the planetary reducer comprising a sun gear, a plurality of planetary gears, and a rotating arm in driving connection, the sun gear meshing with the planetary gears; a ring gear disposed on the inner wall of the reducer housing, the planetary gears mounted on the rotating arm and meshing with the ring gear; the rotating arm rotatably mounted on the reducer housing via a bearing; and characterized in that: The end of any level sun gear close to the previous level arm is the connecting end. A connecting hole is provided on the previous level arm. The connecting end is inserted into the connecting hole and abuts against the previous level arm. The end of the sun gear away from the previous level arm abuts against the current level arm. An involute external spline is provided on the outer wall of the connecting end, and an involute internal spline meshing with the spline is provided on the inner wall of the connecting hole.

2. The electric setting tool reducer for oil and gas wells according to claim 1, characterized in that: The reducer housing comprises an outer cylinder, and an input flange (15) and an output flange (2) respectively mounted at both ends of the outer cylinder; the end of the sun gear of the first-stage planetary reducer away from the output flange (2) is the input end, and the motor input shaft can pass through the center hole of the input flange (15) and be connected to the input end; the end of the rotating arm of the last-stage planetary reducer away from the input flange (15) is the output end, and the output end extends outward from the center hole of the output flange (2).

3. The electric setting tool reducer for oil and gas wells according to claim 2, characterized in that: The outer cylinder comprises at least two cylinders that are fixedly connected in sequence along the axial direction.

4. The electric setting tool reducer for oil and gas wells according to claim 1, characterized in that: A threaded surface, an assembly surface and an annular step are sequentially provided on the rotating arm of any stage of the planetary reducer. A bearing sleeve is connected to the threaded surface. The inner ring of the bearing of this stage is installed on the assembly surface with an interference fit. The end faces of the inner ring are respectively in contact with the bearing sleeve and the annular step; a limiting member for axially limiting the bearing is fixedly provided on the inner wall of the reducer housing, and the limiting member is provided with an annular groove, and the outer ring of the bearing is embedded in the annular groove.

5. The electric setting tool reducer for oil and gas wells according to claim 1, characterized in that: The rotating arm of any stage planetary reducer is provided with a plurality of pin shaft holes evenly distributed around the circumference, the number of the pin shaft holes being the same as the number of the planetary gears of this stage, and also including pin shafts corresponding one-to-one to the pin shaft holes; one end of any pin shaft is inserted into the corresponding pin shaft hole and abuts against the rotating arm, and the other end extends out of the pin shaft hole and is axially limited by a retaining ring; the planetary gear is rotatably sleeved on the end of the pin shaft extending out of the pin shaft hole.

6. The electric setting tool reducer for oil and gas wells according to claim 5, characterized in that: A bearing is provided between the planetary gear and the pin shaft.

7. The electric setting tool reducer for oil and gas wells according to claim 1, characterized in that: A total of four-stage planetary reducers are arranged in the reducer housing.

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