An improved chain saw arm reduction

Abstract

The utility model relates to an improved chain saw arm speed reducer belongs to the field of speed reducer, the utility model discloses a box body, its structural characteristics lie in: still including the primary worm, primary worm wheel, primary wheel hub, secondary worm, secondary worm wheel, secondary wheel hub, sun gear, planet wheel, gear ring, planet axle, planet carrier, output shaft, support axle and power axle installed in the box body, the primary worm is engaged with primary worm wheel, and primary worm wheel is connected with primary wheel hub, and primary wheel hub is connected with secondary worm, and secondary worm is engaged with secondary worm wheel, and secondary worm wheel is connected with secondary wheel hub, and secondary wheel hub is connected with sun gear, and sun gear is engaged with planet wheel, and planet wheel is engaged with gear ring, and planet wheel is installed on planet axle, and one end of planet axle is installed on planet carrier, and the other end of planet axle is installed on output shaft, and support axle is installed in sun gear, and one end of support axle is fixed with output shaft, and O type ring is installed between output shaft and support axle, and power axle is installed in support axle.

Description

Technical Field

[0001] This utility model relates to an improved chainsaw arm reducer, belonging to the field of reducers. Background Technology

[0002] Chainsaw arm reducers typically consist of two stages of double-envelope toroidal worm gear pairs. Since the swing arm only operates within a 180-degree range, at most only half of the teeth of the final stage worm gear are engaged in operation, while the other half remain idle, resulting in waste. Furthermore, because the worm gear is made of copper alloy, it is prone to tooth breakage and wear under high-frequency heavy-load impact, thus limiting the reducer's service life. Utility Model Content

[0003] The purpose of this invention is to overcome the aforementioned shortcomings in the existing technology and to provide an improved chainsaw arm reducer with a reasonable structural design. This chainsaw arm reducer, designed according to the working characteristics of stone cutting, is a double-envelope toroidal composite involute planetary gear reducer capable of withstanding large radial loads and high-frequency impact loads. It is a fully enclosed reducer that can operate at any angle of 360 degrees.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: The improved chainsaw arm reducer includes a housing, and its structural features are as follows: it also includes a first-stage worm, a first-stage worm wheel, a first-stage hub, a second-stage worm, a second-stage worm wheel, a second-stage hub, a sun gear, planetary gears, a gear ring, a planetary shaft, a planetary carrier, an output shaft, a support shaft, and a power shaft installed in the housing. The first-stage worm meshes with the first-stage worm wheel, the first-stage worm wheel is connected to the first-stage hub, the first-stage hub is connected to the second-stage worm, the second-stage worm meshes with the second-stage worm wheel, the second-stage worm wheel is connected to the second-stage hub, the second-stage hub is connected to the sun gear, the sun gear meshes with the planetary gears, the planetary gears mesh with the gear ring, the planetary gears are installed on the planetary shaft, one end of the planetary shaft is installed on the planetary carrier, the other end of the planetary shaft is installed on the output shaft, the support shaft is installed inside the sun gear, and one end of the support shaft is fixed to the output shaft. A No. 1 O-ring is installed between the output shaft and the support shaft, and the power shaft is installed inside the support shaft.

[0005] Furthermore, the first-stage worm gear is connected to the first-stage hub via a reamed hole bolt, the first-stage hub is connected to the second-stage worm via a first flat key, the second-stage worm gear is connected to the second-stage hub via a shoulder screw, the second-stage hub is connected to the sun gear via a spline, the gear ring is fixed to the housing, a second flat key is installed on the output shaft, the other end of the support shaft is supported by rollers, and a first end cap is installed on the other end of the support shaft. Oil seals are installed on the power shaft and the first end cap, as well as on the first end cap and the sun gear. A third O-ring is installed between the first end cap and the support shaft. The two ends of the power shaft are supported by a first full roller bearing and a first tapered roller bearing, respectively, and the first full roller bearing and the first tapered roller bearing are respectively installed at both ends of the support shaft.

[0006] Furthermore, it also includes crossed rollers and a fixed flange. The gear ring is mounted on the fixed flange, the fixed flange is mounted on the housing, the output shaft is provided with a raceway, and the crossed rollers are located in the raceway. The output shaft, crossed rollers, fixed flange, and gear ring constitute a crossed roller bearing.

[0007] Furthermore, a flexible cylindrical pin and a positioning pin are installed on the fixed flange. The flexible cylindrical pin is installed on the housing, and the positioning pin is installed on the gear ring.

[0008] Furthermore, a deep groove ball bearing is fitted in the middle of the sun gear and fixed on the planetary carrier. The two ends of the sun gear are supported by a No. 2 tapered roller bearing and a No. 3 tapered roller bearing, respectively. The No. 2 tapered roller bearing is mounted on a connecting seat, which is mounted on the housing. A connecting flange is mounted on the connecting seat. A No. 2 sealing ring is installed between the sun gear and the connecting flange. A No. 4 O-ring is installed between the connecting flange and the connecting seat. The No. 3 tapered roller bearing is mounted on the output shaft.

[0009] Furthermore, a second full roll bearing is fitted around the planetary shaft, and the second full roll bearing is located between the planetary shaft and the planetary gears.

[0010] Furthermore, the two ends of the secondary worm gear are supported by a No. 4 tapered roller bearing and a No. 5 tapered roller bearing, respectively. The No. 4 tapered roller bearing is installed on a No. 1 bearing sleeve, which is installed at one end of the housing via a No. 2 end cap. An adjusting shim is installed between the No. 1 bearing sleeve and the housing. A No. 6 O-ring is installed between the No. 2 end cap and the No. 1 bearing sleeve, and between the No. 1 bearing sleeve and the housing. The No. 5 tapered roller bearing is installed on a No. 3 end cap, which is installed at the other end of the housing. A No. 5 O-ring is installed between the No. 3 end cap and the housing. A cylindrical roller bearing is fitted in the middle of the secondary worm gear, which is installed on a No. 2 bearing sleeve, which is installed inside the housing.

[0011] Furthermore, the two ends of the first-stage worm gear are supported by a No. 6 tapered roller bearing and a No. 7 tapered roller bearing, respectively. The No. 6 tapered roller bearing is mounted on the housing through a No. 4 end cap. A No. 5 sealing ring is installed between the first-stage worm gear and the No. 4 end cap. An No. 8 O-ring is installed between the No. 4 end cap and the housing. The No. 7 tapered roller bearing is mounted on the housing through a No. 5 end cap. A No. 7 O-ring is installed between the No. 5 end cap and the housing. An oil sight glass and a lifting ring are installed on the housing.

[0012] Furthermore, one end of the secondary worm gear is equipped with an encoder shaft and a nut, and a sealing ring is installed between the encoder shaft and the end cap. The other end of the secondary worm gear is equipped with an encoder shaft and a nut, and a sealing ring is installed between the encoder shaft and the end cap.

[0013] Furthermore, a No. 6 end cap is installed on the fixed flange, the No. 6 end cap is fitted over the output shaft, an oil nozzle is installed on the end cap, a No. 1 sealing ring is installed between the No. 6 end cap and the output shaft, and No. 2 O-rings are installed between the No. 6 end cap and the fixed flange, between the fixed flange and the gear ring, and between the gear ring and the housing.

[0014] Compared with existing technologies, this utility model has the following advantages: The reducer, composed of a two-stage double-enveloping toroidal worm gear pair and a single-stage involute planetary gear set, adds a planetary gear reducer with a speed ratio of approximately 4 to the original two-stage double-enveloping toroidal worm gear reducer, forming a three-stage reduction. In this combination, all planetary gears are fully engaged, capable of withstanding large instantaneous impact loads. The worm gear teeth are also fully engaged within the 180-degree swing range of the chain arm, reducing the load on the worm gear teeth by approximately three times, effectively preventing tooth breakage and wear.

[0015] The reducer, serving as the power unit for rotating the stone cutting chain arm, can hover and self-lock at any position. The chain arm swings 180 degrees, therefore the original two-stage, double-envelope toroidal worm gear pair is retained for power transmission and self-locking. The added final-stage planetary gear set ensures all planetary gear teeth are engaged instantaneously, capable of withstanding the high-frequency, heavy-load impacts generated by chainsaw cutting. The output shaft bearing is designed as a crossed roller bearing, capable of withstanding the radial force generated by the cutting and pressing feed device. Due to varying cutting positions, the reducer needs to rotate arbitrarily and operate at any angle; therefore, it features a fully enclosed design. The reducer is equipped with an encoder shaft for connecting an external encoder to accurately sense the real-time position of the chainsaw arm. An external power shaft drives the chain in the stone-cutting motion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the improved chainsaw arm reducer according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the AA cross-sectional structure.

[0018] Figure 3 yes Figure 2 A schematic diagram of the BB cross-sectional structure.

[0019] Figure 4 yes Figure 3 A schematic diagram of the CC cross-sectional structure.

[0020] In the diagram: 1. Housing; 2. Elastic cylindrical pin; 3. Fixed flange; 4. Locating pin; 5. Oil nozzle; 6. Crossed roller bearing; 7. Output shaft; 8. No. 1 O-ring; 9. Drive shaft; 10. No. 1 tapered roller bearing; 11. No. 3 tapered roller bearing; 12. Support shaft; 13. No. 1 seal; 14. No. 2 O-ring; 15. No. 2 full roll bearing; 16. Gear ring; 17. Planetary gear; 18. Sun gear; 19. Deep groove ball bearing; 20. Spline; 21. No. 2 tapered roller bearing; 22. Roller; 23. Oil seal; 24. No. 1 full roll bearing; 25. No. 3 O-ring; 26. No. 2 seal; 27. No. 4 O-ring; 28. Connecting flange; 29. ​​Secondary hub; 30. Shoulder screw; 31. Secondary worm gear; 32. Planetary carrier; 33. Secondary worm; 34. No. 5 O-ring; 35. No. 5 tapered roller bearing. 36. Sub-bearing; 37. Nut No. 2; 38. End Cap No. 3; 39. Encoder Shaft No. 2; 40. Seal Ring No. 3; 41. Flat Key No. 1; 42. First-Stage Hub; 43. Reamed Hole Bolt; 44. First-Stage Worm Gear; 45. Cylindrical Roller Bearing; 46. Bearing Sleeve No. 2; Adjusting Shim; 47. End Cap No. 2; 48. Encoder Shaft No. 1; 49. Seal Ring No. 4; 50. Nut No. 1; 51. O-ring No. 6; 52. Tapered Roller Bearing No. 4; 53. Bearing Sleeve No. 1; 54. Oil Mirror; 55. End Cap No. 5; 56. Tapered Roller Bearing No. 7; 57. Flat Key No. 2; 58. O-ring No. 7; 59. Lifting Ring; 60. First-Stage Worm Gear; 61. Seal Ring No. 5; 62. Tapered Roller Bearing No. 6; 63. O-ring No. 8; 64. End Cap No. 4; 65. End Cap No. 6; 66. Connecting Seat; 67. End Cap No. 1; 68. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example

[0023] See Figures 1 to 4As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0024] The improved chainsaw arm reducer in this embodiment includes a housing 1, and a primary worm gear 44, a primary worm wheel 61, a primary hub 42, a secondary worm gear 34, a secondary worm wheel 32, a secondary hub 30, a sun gear 19, planetary gears 18, a gear ring 17, a planetary shaft 15, a planet carrier 33, an output shaft 7, a support shaft 12, a power shaft 9, a cross roller 6, and a fixed flange 3, all installed inside the housing 1.

[0025] In this embodiment, the first-stage worm 44 meshes with the first-stage worm wheel 61, the first-stage worm wheel 61 is connected to the first-stage hub 42 by a reamed bolt 43, the first-stage hub 42 is connected to the second-stage worm 34 by a first flat key 41, the second-stage worm 34 meshes with the second-stage worm wheel 32, the second-stage worm wheel 32 is connected to the second-stage hub 30 by a shoulder screw 31, and the second-stage hub 30 is connected to the sun gear 19 by a spline 21.

[0026] In this embodiment, the sun gear 19 meshes with the planet gear 18, the planet gear 18 meshes with the gear ring 17, the gear ring 17 is fixed to the housing 1, the planet gear 18 is mounted on the planet shaft 15, the planet shaft 15 is fitted with a No. 2 full roller bearing 16, the No. 2 full roller bearing 16 is located between the planet shaft 15 and the planet gear 18, one end of the planet shaft 15 is mounted on the planet carrier 33, the other end of the planet shaft 15 is mounted on the output shaft 7, and a No. 2 flat key 58 is mounted on the output shaft 7.

[0027] In this embodiment, the support shaft 12 is installed inside the sun gear 19, and one end of the support shaft 12 is fixed to the output shaft 7. The other end of the support shaft 12 is supported by rollers 23, and a first end cap 68 is installed on the other end of the support shaft 12. Oil seals 24 are installed on the power shaft 9 and the first end cap 68, as well as on the first end cap 68 and the sun gear 19. A third O-ring 26 is installed between the first end cap 68 and the support shaft 12. A first O-ring 8 is installed between the output shaft 7 and the support shaft 12. The power shaft 9 is installed inside the support shaft 12, and both ends of the power shaft 9 are supported by a first full roller bearing 25 and a first tapered roller bearing 10, respectively. The first full roller bearing 25 and the first tapered roller bearing 10 are respectively installed on both ends of the support shaft 12.

[0028] In this embodiment, the gear ring 17 is mounted on the fixed flange 3, the fixed flange 3 is mounted on the housing 1, the output shaft 7 is provided with a raceway, the cross roller 6 is located in the raceway, the output shaft 7, the cross roller 6, the fixed flange 3 and the gear ring 17 form a cross roller bearing, the fixed flange 3 is mounted with an elastic cylindrical pin 2 and a positioning pin 4, the elastic cylindrical pin 2 is mounted on the housing 1, and the positioning pin 4 is mounted on the gear ring 17.

[0029] In this embodiment, a deep groove ball bearing 20 is fitted in the middle of the sun gear 19, and the deep groove ball bearing 20 is fixed on the planetary carrier 33. The two ends of the sun gear 19 are supported by a second tapered roller bearing 22 and a third tapered roller bearing 11, respectively. The second tapered roller bearing 22 is mounted on a connecting seat 67, which is mounted on the housing 1. A connecting flange 29 is mounted on the connecting seat 67. A second sealing ring 27 is installed between the sun gear 19 and the connecting flange 29. A fourth O-ring 28 is installed between the connecting flange 29 and the connecting seat 67. The third tapered roller bearing 11 is mounted on the output shaft 7.

[0030] In this embodiment, the two ends of the secondary worm gear 34 are supported by a No. 4 tapered roller bearing 53 and a No. 5 tapered roller bearing 36, respectively. The No. 4 tapered roller bearing 53 is mounted on the No. 1 bearing sleeve 54. The No. 1 bearing sleeve 54 is mounted on one end of the housing 1 through the No. 2 end cap 48. An adjusting shim 47 is installed between the No. 1 bearing sleeve 54 and the housing 1. A No. 6 O-ring 52 is installed between the No. 2 end cap 48 and the No. 1 bearing sleeve 54, and between the No. 1 bearing sleeve 54 and the housing 1. The No. 5 tapered roller bearing 36 is mounted on the No. 3 end cap 38. The No. 3 end cap 38 is installed on the other end of the housing 1. A No. 5 O-ring 35 is installed between the No. 3 end cap 38 and the housing 1. A cylindrical roller bearing 45 is fitted in the middle of the secondary worm gear 34. The cylindrical roller bearing 45 is mounted on the No. 2 bearing sleeve 46. The No. 2 bearing sleeve 46 is installed inside the housing 1.

[0031] In this embodiment, the two ends of the first-stage worm gear 44 are supported by a No. 6 tapered roller bearing 63 and a No. 7 tapered roller bearing 57, respectively. The No. 6 tapered roller bearing 63 is mounted on the housing 1 through the No. 4 end cap 65. A No. 5 sealing ring 62 is installed between the first-stage worm gear 44 and the No. 4 end cap 65. An No. 8 O-ring 64 is installed between the No. 4 end cap 65 and the housing 1. The No. 7 tapered roller bearing 57 is mounted on the housing 1 through the No. 5 end cap 56. A No. 7 O-ring 59 is installed between the No. 5 end cap 56 and the housing 1. An oil sight glass 55 and a lifting ring 60 are installed on the housing 1.

[0032] In this embodiment, one end of the secondary worm gear 34 is equipped with a first encoder shaft 49 and a first nut 51. A fourth sealing ring 50 is installed between the first encoder shaft 49 and the second end cover 48. The other end of the secondary worm gear 34 is equipped with a second encoder shaft 39 and a second nut 37. A third sealing ring 40 is installed between the second encoder shaft 39 and the third end cover 38.

[0033] In this embodiment, a No. 6 end cap 66 is installed on the fixed flange 3. The No. 6 end cap 66 is fitted over the output shaft 7. An oil nozzle 5 is installed on the No. 6 end cap 66. A No. 1 sealing ring 13 is installed between the No. 6 end cap 66 and the output shaft 7. A No. 2 O-ring 14 is installed between the No. 6 end cap 66 and the fixed flange 3, between the fixed flange 3 and the gear ring 17, and between the gear ring 17 and the housing 1.

[0034] Specifically, after the first-stage worm gear 44 and the first-stage worm wheel 61 reduce speed, they drive the second-stage worm gear 34 through the reamed bolt 43, the first-stage hub 42, and the first flat key 41. The second-stage worm gear 34 meshes with the second-stage worm wheel 32. The second-stage worm wheel 32 transmits power to the sun gear 19 through the shoulder screw 31, the second-stage hub 30, and the spline 21. The sun gear 19 drives the planet gear 18 to rotate on its own axis and revolve around the gear ring 17, thereby driving the planetary shaft 15, the planet carrier 33, and the output shaft 7 to rotate. The second flat key 58 on the output shaft 7 drives the chainsaw arm to rotate.

[0035] The support shaft 12 serves as the support shaft for the chainsaw arm. The right end of the support shaft 12 is fixed to the output shaft 7, and the left end of the support shaft 12 is supported by the roller 23. The support shaft 12 and the sun gear 19 maintain relative rotation.

[0036] The power shaft 9, driven by a separate power source, serves as the chain power shaft and is fixed to the support shaft 12 via a full roller bearing 25 and a tapered roller bearing 10.

[0037] The output shaft 7 is designed with a raceway, and the raceway is equipped with crossed rollers 6. The output shaft 7, crossed rollers 6, fixed flange 3, and gear ring 17 form a crossed roller bearing. The fixed flange 3 is fixed to the housing 1 with screws and the impact load is buffered by the elastic cylindrical pin 2. The positioning pin 4 ensures the relative position of the fixed flange 3 and the gear ring 17.

[0038] The deep groove ball bearing 20 is fixed to the planetary carrier 33 and provides auxiliary support to the output shaft 7 through the planetary shaft 15. This design can withstand heavy axial and radial load impacts at the same time.

[0039] The secondary hub 30 is connected to the sun gear 19 via spline 21. A deep groove ball bearing 20 is installed between the sun gear 19 and the planetary carrier 33. A third tapered roller bearing 11 is installed between the right end of the sun gear 19 and the output shaft 7. A second tapered roller bearing 22 is installed between the left end of the sun gear 19 and the connecting seat 67. The connecting seat 67 is fixed to the housing 1.

[0040] The left end of the second-stage worm gear 34 is supported by the fourth tapered roller bearing 53, the right end of the second-stage worm gear 34 is supported by the fifth tapered roller bearing 36, and the cylindrical roller bearing 45 provides auxiliary support.

[0041] The right end of the output shaft 7 is the connection end of the chainsaw arm. Since sand brought by the chain can easily enter the reducer, a double No. 1 seal ring 13 is designed. Lubricating grease is injected between the two No. 1 seal rings 13 through the grease nipple 5, forming a grease isolation zone between the two No. 1 seal rings 13, thus forming a triple seal and improving the reliability of the seal.

[0042] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. An improved chainsaw arm reducer, comprising a housing (1), characterized in that: It also includes a first-stage worm (44), a first-stage worm wheel (61), a first-stage hub (42), a second-stage worm (34), a second-stage worm wheel (32), a second-stage hub (30), a sun gear (19), planetary gears (18), a gear ring (17), a planetary shaft (15), a planet carrier (33), an output shaft (7), a support shaft (12), and a power shaft (9) installed in the housing (1). The first-stage worm (44) meshes with the first-stage worm wheel (61), the first-stage worm wheel (61) is connected to the first-stage hub (42), the first-stage hub (42) is connected to the second-stage worm (34), and the second-stage worm (34) meshes with the second-stage worm wheel (32). The secondary worm gear (32) is connected to the secondary hub (30), the secondary hub (30) is connected to the sun gear (19), the sun gear (19) meshes with the planet gear (18), the planet gear (18) meshes with the ring gear (17), the planet gear (18) is mounted on the planet shaft (15), one end of the planet shaft (15) is mounted on the planet carrier (33), the other end of the planet shaft (15) is mounted on the output shaft (7), the support shaft (12) is mounted inside the sun gear (19), and one end of the support shaft (12) is fixed to the output shaft (7), and the power shaft (9) is mounted inside the support shaft (12).

2. The improved chainsaw arm reducer according to claim 1, characterized in that: The first-stage worm gear (61) is connected to the first-stage hub (42) by a reamed bolt (43). The first-stage hub (42) is connected to the second-stage worm (34) by a first flat key (41). The second-stage worm gear (32) is connected to the second-stage hub (30) by a shoulder screw (31). The second-stage hub (30) is connected to the sun gear (19) by a spline (21). The gear ring (17) is fixed to the housing (1). A second flat key (58) is installed on the output shaft (7). The other end of the support shaft (12) is supported by a roller (23), and a first end cap (68) is installed on the other end of the support shaft (12). The two ends of the power shaft (9) are supported by a first full roller bearing (25) and a first tapered roller bearing (10), respectively. The first full roller bearing (25) and the first tapered roller bearing (10) are respectively installed at the two ends of the support shaft (12).

3. The improved chainsaw arm reducer according to claim 1, characterized in that: It also includes a cross roller (6) and a fixed flange (3), the gear ring (17) is mounted on the fixed flange (3), the fixed flange (3) is mounted on the housing (1), the output shaft (7) is provided with a raceway, the cross roller (6) is located in the raceway, and the output shaft (7), the cross roller (6), the fixed flange (3) and the gear ring (17) constitute a cross roller bearing.

4. The improved chainsaw arm reducer according to claim 3, characterized in that: The fixed flange (3) is equipped with an elastic cylindrical pin (2) and a positioning pin (4). The elastic cylindrical pin (2) is installed on the housing (1), and the positioning pin (4) is installed on the gear ring (17).

5. The improved chainsaw arm reducer according to claim 1, characterized in that: The sun gear (19) is fitted with a deep groove ball bearing (20) in the middle, and the deep groove ball bearing (20) is fixed on the planet carrier (33). The two ends of the sun gear (19) are supported by a second tapered roller bearing (22) and a third tapered roller bearing (11) respectively. The second tapered roller bearing (22) is mounted on a connecting seat (67), the connecting seat (67) is mounted on the housing (1), the connecting seat (67) is mounted with a connecting flange (29), and the third tapered roller bearing (11) is mounted on the output shaft (7).

6. The improved chainsaw arm reducer according to claim 1, characterized in that: The planetary shaft (15) is fitted with a No. 2 full roller bearing (16), which is located between the planetary shaft (15) and the planetary gear (18).

7. The improved chainsaw arm reducer according to claim 1, characterized in that: The two ends of the secondary worm (34) are supported by a No. 4 tapered roller bearing (53) and a No. 5 tapered roller bearing (36) respectively. The No. 4 tapered roller bearing (53) is installed on the No. 1 bearing sleeve (54). The No. 1 bearing sleeve (54) is installed on one end of the housing (1) through the No. 2 end cap (48). The No. 5 tapered roller bearing (36) is installed on the No. 3 end cap (38). The No. 3 end cap (38) is installed on the other end of the housing (1). A cylindrical roller bearing (45) is fitted in the middle of the secondary worm (34). The cylindrical roller bearing (45) is installed on the No. 2 bearing sleeve (46). The No. 2 bearing sleeve (46) is installed inside the housing (1).

8. The improved chainsaw arm reducer according to claim 1, characterized in that: The two ends of the first-stage worm gear (44) are supported by a No. 6 tapered roller bearing (63) and a No. 7 tapered roller bearing (57) respectively. The No. 6 tapered roller bearing (63) is mounted on the housing (1) through the No. 4 end cap (65), and the No. 7 tapered roller bearing (57) is mounted on the housing (1) through the No. 5 end cap (56).

9. The improved chainsaw arm reducer according to claim 1, characterized in that: One end of the secondary worm gear (34) is equipped with a first encoder shaft (49) and a first nut (51), and the other end of the secondary worm gear (34) is equipped with a second encoder shaft (39) and a second nut (37).

10. The improved chainsaw arm reducer according to claim 3, characterized in that: The fixed flange (3) is equipped with a No. 6 end cap (66), which is fitted over the output shaft (7).

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