CN113494585A

CN113494585A - Parallel shaft box-separating speed reducer

Info

Publication number: CN113494585A
Application number: CN202010249570.XA
Authority: CN
Inventors: 江文斌
Original assignee: Zhejiang Sci Tech University ZSTU
Current assignee: Zhejiang Sci Tech University ZSTU; Zhejiang University of Science and Technology ZUST
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2021-10-12

Abstract

The invention provides a parallel shaft box-dividing speed reducer, which comprises a speed reducer case, a plurality of speed reducing gear sets and a connecting sleeve, wherein the speed reducer case is divided into a main case body and a sub case body which are detachably connected, the interface of the main case body and the sub case body corresponds to the position of a first-stage speed reducing gear set, the connecting sleeve is detachably connected with the sub case body, a small gear of the first-stage speed reducing gear set is detachably arranged on a shaft of the small gear, and a large gear of the first-stage speed reducing gear set is detachably arranged on the shaft of the large gear; the transmission shafts of all stages in the multi-stage reduction gear set are parallel. The invention can meet the requirement of the dealer according to the client, can quickly and conveniently adjust the speed ratio, and can reduce the stock and the fund occupation as much as possible.

Description

Parallel shaft box-separating speed reducer

Technical Field

The invention relates to the field of speed reducing motors.

Background

The speed reducer is an independent component consisting of gear drive, worm drive and gear-worm drive which are enclosed in a rigid shell, is commonly used as a speed reduction transmission device between a prime mover and a working machine, and is used for reducing the rotating speed and increasing the torque. The machine is widely applied to modern machines and is a relatively precise machine. The lower rotating speed is output after the speed is reduced through the multi-stage transmission of the speed reducer, the requirement of the actual working condition is met, the transmission route of the actual working condition is simplified, and the cost and the transmission space are saved. In the prior speed reducer, a box body is an integer, one speed reducer corresponds to a speed ratio and outputs a rotating speed under the condition of unchanged input rotating speed, the installation and the disassembly of transmission parts in the speed reducer are limited by the structure of the box body, generally, only one path is needed, the parts of the installed speed reducer need to be replaced, the path opposite to the installation path needs to be disassembled, and the speed reducer is inconvenient to replace after leaving a factory, particularly, the first-stage transmission gear is often installed initially, and the subsequent transmission gear needs to be completely removed when the first-stage transmission gear needs to be replaced, the high requirement is provided for the installation precision of the speed reducer, the first-stage transmission gear is replaced after each part meshed in the box body is sequentially disassembled, and the speed reducers with different speed ratios cannot be prepared for dealers, even if speed reducers with different speed ratios are prepared, the method causes huge inventory and occupied funds, and is not beneficial to quickly responding to market demands and controlling cost.

Disclosure of Invention

The invention aims to provide a parallel shaft box-separating speed reducer which can meet the requirement of a dealer according to the requirement of a client, can quickly and conveniently adjust the speed ratio, and can reduce the stock and reduce the fund occupation as far as possible.

Therefore, the invention adopts the following technical scheme:

a parallel shaft box-dividing speed reducer comprises a speed reducer case, a plurality of speed reducing gear sets and a connecting sleeve, and is characterized in that the speed reducer case is divided into a main case body and a sub case body which are detachably connected, the interface of the main case body and the sub case body corresponds to the position of a first-stage speed reducing gear set, the connecting sleeve is detachably connected with the sub case body, a pinion of the first-stage speed reducing gear set is detachably arranged on the shaft of the first-stage speed reducing gear set, and a bull gear of the first-stage speed reducing gear set is detachably arranged on the shaft of the bull gear;

the transmission shafts of all stages in the multi-stage reduction gear set are parallel.

Furthermore, the main box body is provided with an open end at the side close to the branch box body, an intermediate supporting clapboard is arranged at the bottom of the open end, and the small gear and the big gear are positioned in a space formed by the open end and the branch box body.

Furthermore, the box body is provided with a primary gear shaft right shaft hole, the side of the main box body close to the branch box body is provided with a middle supporting clapboard, and the middle supporting clapboard is provided with a primary gear shaft left shaft hole; the left end and the right end of the primary gear shaft are respectively fixed on the branch box body and the main box body through a first bearing and a second bearing.

Further, the transmission input assembly with the pinion is assembled on the coupling sleeve, and the pinion of the first reduction gear set is arranged outside the coupling sleeve.

Furthermore, the outer end of the pinion shaft of the first-stage reduction gear set extends out of the outer end of the connecting sleeve, and the extending end is provided with a part which can be connected with a belt wheel, a gear or a chain wheel.

Furthermore, the first-level large gear is fixed on the first-level large gear shaft through a first-level large gear key, and the other end of the first-level large gear shaft is provided with a second-level small gear. The pinion is fixed on the pinion shaft through a pinion key, and a detachable pinion retainer ring is arranged at the inner end of the lower gear shaft to prevent the pinion from loosening.

Furthermore, the branch box body is provided with a primary big gear shaft right shaft hole, the side of the main box body close to the branch box body is provided with a middle supporting clapboard, and the middle supporting clapboard is provided with a primary big gear shaft left shaft hole; the left side shaft shoulder of the second pinion on the one-level gear shaft is contacted with the right side of the inner ring of the second bearing, the left shaft hole of the one-level gear shaft is provided with a second hole retainer ring, the first hole retainer ring, the second hole retainer ring, the first bearing, the second pinion and the first gear shaft are axially fixed on the one-level gear shaft.

Furthermore, one side of the main box body, which is close to the branch box body, is provided with an intermediate support baffle plate, the intermediate support baffle plate is provided with a secondary large gear shaft intermediate shaft hole, one side of the main box body, which is far away from the branch box body, is provided with a secondary large gear shaft left shaft hole, and the branch box body is provided with a secondary large gear shaft right shaft hole;

the second grade bull gear axle right-hand member has the third bearing, the left end has the fourth bearing, be equipped with the fifth bearing between second grade gear wheel and tertiary pinion, the third bearing is located second grade bull gear axle right side shaft hole, second grade bull gear axle right side shaft hole has the hole to keep off the outer lane right side of shoulder and third bearing in the outside of third bearing and contacts, the fourth bearing is located second grade bull gear axle left side shaft hole, be equipped with third hole retaining ring in the second grade bull gear axle left side shaft hole, third hole retaining ring contacts with the left side of fourth bearing outer lane, the fifth bearing is located second grade bull gear axle middle shaft hole, be equipped with first axle sleeve between second grade bull gear and the third bearing, the right side terminal surface of first axle sleeve contacts with the left side of third bearing inner circle, the clearance when the length of first axle sleeve is used for adjusting the installation.

Furthermore, one side of the main box body, which is close to the branch box body, is provided with a middle supporting clapboard, the middle supporting clapboard is provided with a right shaft hole of the three-level big gear shaft, and one side of the main box body, which is far away from the branch box body, is provided with a left shaft hole of the three-level big gear shaft;

a sixth bearing is arranged at the right end of the third-stage big gear shaft and positioned at the right side of the third-stage big gear, the shaft diameter of the third-stage big gear shaft at the third-stage big gear is larger than that of the sixth bearing, the left side of the inner ring of the sixth bearing is contacted with the right end surface of the third-stage big gear and positioned at the right side of the sixth bearing, a second shaft retainer ring on the third-stage gear wheel shaft is contacted with the right side of an inner ring of a sixth bearing, the right side of an outer ring of the sixth bearing is contacted with a retaining shoulder on a right shaft hole of a third-stage gear wheel shaft, a seventh bearing is arranged on the left side of the third-stage gear wheel, a second shaft sleeve is arranged between the third-stage gear wheel and the seventh bearing, a raised shaft diameter is arranged on the left side of the third-stage gear wheel shaft, the right shoulder of the raised shaft diameter is contacted with the left side of an inner ring of the seventh bearing, the right side of the outer ring of the seventh bearing is contacted with a retaining shoulder on the left shaft hole of the third-stage gear wheel shaft, the second shaft sleeve is positioned between the seventh bearing and the third-stage gear wheel, and the length of the second shaft sleeve is used for adjusting the gap during installation;

the left side of the main box body and the outer side of the seventh bearing are provided with connecting flanges which can be used for output installation of the speed reducer, the connecting flanges are used as left axial positioning components of the seventh bearing, the connecting flanges are fixed on the main box body through bolts, and a sealing ring is arranged between a protruding shaft diameter at the left side of the connecting flange hole and the left side of the seventh bearing to prevent lubricating oil from leaking outwards when an internal gear of the speed reducer rotates.

By adopting the technical scheme of the invention, the invention adopts a box-separating structure, the reduction box is divided into two detachable parts between the primary transmission and the secondary transmission, after adopting the structure, a dealer only needs to be equipped with primary reduction gears with different speed ratios, when a client needs to change the speed ratio, the transmission input assembly is disassembled, then the bolts for connecting the box-separating body and the main box body are disassembled, the box-separating body can be disassembled, the primary bull gear shaft and the primary bull gear can be directly taken down from the side of the box-separating body, the primary pinion can be conveniently taken down, the primary pinion and the primary bull gear with the same center distance can be conveniently replaced, the adjustment of the reduction ratio can be completed by re-installing, the secondary speed change gear is not needed to be disassembled, the primary transmission gear can be conveniently and rapidly replaced, and the client can conveniently configure the speed ratio.

Drawings

Fig. 1 is a schematic diagram of a reduction box according to an embodiment of the invention.

Fig. 2 is a second schematic diagram of a reduction box according to an embodiment of the invention.

Fig. 3 is an outline view of a reducer according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view a-a of fig. 3 (a schematic view of a one-stage transmission engagement).

Fig. 5 is a cross-sectional view B-B of fig. 3 (two-step drive engagement schematic).

FIG. 6 is a cross-sectional view C-C of FIG. 3 (three stage drive engagement schematic).

Fig. 7 is a cross-sectional view taken along line D-D of fig. 4.

Fig. 8 is a cross-sectional view E-E of fig. 5.

Detailed Description

The invention is described in further detail with reference to the figures and specific embodiments. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top", "bottom", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in the figure. The parallel shaft box-separating speed reducer that this embodiment provided includes following structure:

referring mainly to fig. 4 and 7, a first-level pinion 1 is fixed on a first-level pinion shaft 3 through a first-level pinion key 2 and is meshed with a first-level gearwheel 4, a first shaft retainer ring 25 is arranged on the outer side of the first-level pinion shaft 3 on the first-level pinion 1 to prevent the first-level pinion 1 from axially loosening, the first-level gearwheel 4 is fixed on a first-level gearwheel shaft 8 through a first-level gearwheel key 7, and the other end of the first-level gearwheel shaft 8 is provided with a second-level pinion 9. Referring mainly to fig. 5 and 8, the secondary pinion 9 is engaged with the secondary bull gear 11, the secondary bull gear 11 is fixed on the secondary bull gear shaft 13 through the secondary bull gear key 12, the other end of the secondary bull gear shaft 13 is provided with the tertiary pinion 14, referring mainly to fig. 6 and 8, the tertiary pinion 14 is engaged with the tertiary bull gear 19, and the tertiary bull gear 19 is fixed on the tertiary bull gear shaft 15 through the tertiary bull gear key 18.

Referring mainly to fig. 7, the first-stage gear shaft 8 is provided with a first bearing 6 on the right side of the first-stage gear shaft 4, a first hole retainer ring 5 is provided on a first-stage gear shaft right shaft hole 241 of the first-stage gear shaft 24 outside the first bearing 6, the first hole retainer ring 5 blocks the outer side of the outer ring of the first bearing 6, the inner side of the inner ring of the first bearing 6 contacts with the right end face of the first-stage gear shaft 4, the left end face of the first-stage gear shaft 4 contacts with the right side of a shaft shoulder protruding in the middle of the first-stage gear shaft 8, the left side shaft shoulder of the second-stage pinion 9 on the first-stage gear shaft 8 contacts with the right side of the inner ring of the second bearing 10, the side of the main box 23 close to the split box 24 is provided with an intermediate support partition 230, the intermediate support partition 230 is provided with a first-stage gear shaft left shaft hole 231, and the first-stage gear shaft hole retainer ring 34 is provided on the left side of the outer ring of the second bearing 10. The first hole retainer ring 5, the second hole retainer ring 34, the first bearing 6 and the second bearing 10 axially fix the primary gearwheel 4 and the secondary pinion 9 on the primary gearwheel shaft 8, and for the main box body, the parts are positioned at the open end outside the middle support clapboard 230; the left and right ends of the primary pinion shaft 8 are fixed on the branch box body 24 and the main box body 23 through the first bearing 6 and the second bearing 10 respectively.

Referring mainly to fig. 8, the right end of the secondary gear shaft 13 has a third bearing 28, the left end has a fourth bearing 31, a fifth bearing 30 is disposed between the secondary gear 11 and the tertiary pinion 14, the third bearing 28 is located in a secondary gear shaft right shaft hole 242 of the sub-box 24, the secondary gear shaft right shaft hole 242 has an inner hole shoulder 281 on the outer side of the third bearing 28 to contact with the right side of the outer ring of the third bearing 28, the fourth bearing 31 is located in a left shaft hole 232 of the main box 23, a third hole retainer 32 is disposed in the primary box 23 secondary gear shaft left shaft hole 232, the third hole retainer 32 contacts with the left side of the outer ring of the fourth bearing 31, the fifth bearing 30 is located in a secondary gear shaft middle shaft hole 233 on the middle support partition 230 of the main box 23, the secondary gear shaft right shaft hole 242 of the sub-box 24, the main box 23 secondary gear shaft left shaft hole 232, and the main box 23 middle shaft hole 233 are the same center, the bore diameter is the same, a sealing cover 33 is arranged at the left outer side of a fourth bearing 31 of a left shaft hole 232 of a second-stage big gear shaft of a main box body 23 to prevent lubricating oil in the box body from leaking outwards, a first shaft sleeve 29 is arranged between a second-stage big gear 11 and a third bearing 28, the right end surface of the first shaft sleeve 29 is contacted with the left side of an inner ring of the third bearing 28, the left end surface of the first shaft sleeve 29 is contacted with the right end surface of the second-stage big gear 11 from right to left, the left end surface of the second-stage big gear 11 is contacted with the right side of an inner ring of a fifth bearing 30, the left side of the inner ring of the fifth bearing 30 is contacted with the right shoulder of a third-stage pinion 14, the left shoulder of the third-stage pinion 14 is contacted with the right side of the inner ring of the fourth bearing 31, the third bearing 28, the first shaft sleeve 29, the second-stage big gear 11 and the fourth bearing 31 are axially fixed through a third hole retainer ring 32 and a right shaft hole 242 retainer ring 281 of the second-stage big gear shaft 24, the length of the first shaft sleeve 29 is used for adjusting the gap during installation, when the axial dimension is too tight during installation, the length of the first sleeve 29 is trimmed appropriately, typically the length of the first sleeve 29 is 0.1-0.3mm more than the design allowable dimension.

Referring mainly to fig. 8, a sixth bearing 20 is arranged at the right end of the third-stage large gear shaft 15 and at the right side of the third-stage large gear 19, the shaft diameter of the third-stage large gear shaft 15 at the third-stage large gear 19 is larger than the shaft diameter of the sixth bearing 20, the left side of the inner ring of the sixth bearing 20 contacts with the right end face of the third-stage large gear 19, a second retainer ring 21 arranged at the right side of the sixth bearing 20 and on the third-stage large gear shaft 15 contacts with the right side of the inner ring of the sixth bearing 20, a third-stage large gear shaft right shaft hole 234 is arranged on a middle supporting partition 230 of the main box 23, the right side of the outer ring of the sixth bearing 20 contacts with a retainer shoulder 211 on the third-stage large gear shaft right shaft hole 234 of the main box 23, a second sleeve 17 is arranged at the left side of the third-stage large gear shaft 15, a raised shaft diameter is arranged at the left side of the seventh bearing 16, the right shoulder of the raised shaft diameter contacts with the left side of the inner ring of the seventh bearing 16, the right side of the outer ring of the seventh bearing 16 is contacted with a blocking shoulder 161 on a left shaft hole 235 of the third-stage bull gear of the main box body 23, the second shaft sleeve 17 is positioned between the seventh bearing 16 and the third-stage bull gear 19, the length of the second shaft sleeve 17 can be corrected according to the axial clearance during installation, and the length of the second shaft sleeve 17 is usually 0.10-0.30mm larger than the design allowable size.

A box cover 22 is arranged above the main box body 23, and the installation of the three-level large gear 19 is facilitated after the box cover 22 is disassembled. The left side of the main box body 23, the outside of the seventh bearing 16 is provided with a connecting flange 35 which can be used for output installation of the speed reducer, the connecting flange 35 is fixed on the main box body 23 through bolts, the connecting flange 35 is simultaneously used as a left axial positioning component of the seventh bearing, and a sealing ring 36 is arranged between a hole of the connecting flange 35 and the left side of the seventh bearing 16 to prevent lubricating oil from leaking outwards when the internal gear of the speed reducer rotates.

The primary pinion shaft 3 with the primary pinion 1 is arranged in the connecting sleeve 40, an extending shaft at the right end of the primary pinion shaft 3 is exposed outside the connecting sleeve 40 and can be used for power input, a raised shaft shoulder is arranged in the middle of the primary pinion shaft 3, a first connecting sleeve bearing 42 and a second connecting sleeve bearing 43 are respectively arranged at two sides of the shaft shoulder, a positioning retainer ring 46 detachably connected with the connecting sleeve 40 is arranged at the outer side of the outer ring of the second connecting sleeve bearing 43, the inner side outer ring of the first connecting sleeve bearing 42 is stopped at the hole bottom of the connecting sleeve 40, and the inner ring of the first connecting sleeve bearing 42 is contacted with the inner side of the shaft shoulder to fix the axial position of the primary pinion shaft 3; an inner lip-shaped sealing ring 41 is arranged on the inner side of the first bearing 42 of the connecting sleeve, an outer lip-shaped sealing ring 45 is arranged on the outer side of the second bearing 43 of the connecting sleeve, and the lip shape faces the inner side of the box body and plays a role in preventing lubricating oil from leaking when the speed reducer gear rotates. The above components constitute a transmission input assembly 401.

An oil drainage screw 47 is arranged below the connecting sleeve 40, when the speed ratio of the speed reducer needs to be changed, the oil drainage screw 40 is firstly removed, part of lubricating oil in the box body is discharged, and the gear is convenient to detach and change.

The transmission input assembly 401 is secured to the outside of the sub-housing 24. The outer end of the sub-tank 24 is provided with a portion connected with the connecting coupling sleeve 40, including the abutting end face 240 and the bolt hole thereon.

The left and right of the first-level big gear shaft right shaft hole 241 and the first-level big gear shaft left shaft hole 231 refer to the positions of fig. 7, the two are located on the same axial lead, wherein the shaft hole on the right of the first-level big gear 4 is the first-level big gear shaft right shaft hole 241, and the shaft hole on the left of the first-level big gear 4 is the first-level big gear shaft left shaft hole 231.

The second-stage gear shaft right shaft hole 242, the second-stage gear shaft left shaft hole 232 and the second-stage gear shaft middle shaft hole 233 refer to the positions of fig. 8, the two shaft holes are located on the same axial lead, the shaft hole located on the right side of the second-stage gear 11 is the second-stage gear shaft right shaft hole 242, the shaft hole located on the leftmost side of the second-stage gear 11 is the second-stage gear shaft left shaft hole 232, and the shaft hole located between the second-stage gear shaft right shaft hole 242 and the second-stage gear shaft left shaft hole 232 is the second-stage gear shaft middle shaft hole 233.

The third-stage bull gear right shaft hole 234 and the third-stage bull gear left shaft hole 235 are positioned as shown in fig. 8 or fig. 7, and are positioned on the same axial lead, wherein the shaft hole on the right side of the third-stage bull gear 19 is the third-stage bull gear right shaft hole 234, and the shaft hole on the left side of the third-stage bull gear 19 is the third-stage bull gear left shaft hole 235.

The first-stage bull gear shaft left shaft hole 231 and the second-stage bull gear shaft middle shaft hole 233 are both arranged at the lower part of the middle supporting clapboard 230, and the third-stage bull gear right shaft hole 234 is arranged at the upper part of the middle supporting clapboard 230.

The outer end of the primary pinion shaft 3, i.e. the right end in the figure, extends out of the coupling sleeve 40, the transmission route of the invention is that power can be input by a belt wheel, a gear, a chain wheel and the like arranged on the extending end of the right end of the primary pinion shaft 3, and is fixedly connected by a key 44, the belt wheel, the gear and the chain wheel rotate to drive the primary pinion shaft 3 and a primary pinion 1 arranged on the primary pinion shaft 3 to rotate, the primary pinion shaft 8 and a secondary pinion 9 are driven to rotate after being decelerated by a primary bull gear 4 meshed with the primary pinion 1, and then are decelerated by a secondary bull gear 11 meshed with the secondary pinion 9, the secondary bull gear 11 also synchronously decelerates the secondary bull gear 13 and a tertiary pinion 14 at the same time of decelerating, the decelerated tertiary pinion 14 is further decelerated by a tertiary bull gear 19 meshed with the tertiary pinion 14, so that the tertiary bull gear 15 rotating together with the tertiary bull gear 19 outputs lower rotating speed, in practical application, according to requirements, a chain wheel, a belt wheel and other transmission elements can be installed on an extension shaft of the decelerated tertiary gear shaft 15, a second reduction box body can also be installed through an optional connecting flange 35 in a connecting mode, the tertiary gear shaft 15 can be connected with a concave input shaft in the second reduction box body or connected with gears in the second reduction box body, further deceleration is achieved, a large reduction ratio can be obtained, gear meshing ratios of all levels can be different, a plurality of speed ratios can be obtained, and practical application requirements are met.

In order to realize a reduction box body with smaller volume and larger reduction ratio, the invention adopts a three-stage reduction parallel transmission shaft, wherein the first and second-stage transmission shafts consist of a first-stage pinion shaft 3, a first-stage pinion shaft 8 and a second-stage pinion shaft 13 which are parallel, are distributed in a triangular shape, and have staggered large and small gears, thereby well saving the space of the box body, and the first-stage large gear 4 is coaxial with the second-stage pinion 9, and the second-stage large gear 11 is coaxial with the third-stage pinion 14.

The existing speed reducer body is usually composed of a transmission input assembly and a box body, one speed reducing motor corresponds to a speed ratio and outputs a rotating speed, the installation and the disassembly of transmission parts in the speed reducer are limited by the structure of the box body, generally, only one path is provided, the parts of the installed speed reducer are required to be replaced, the path opposite to the installation path is required to be disassembled, the replacement after leaving a factory is inconvenient, the parts meshed in the box body are required to be sequentially disassembled and then a first-stage transmission gear is replaced, for a dealer, the speed reducers with various different speed ratios cannot be prepared, even if the speed reducers with different speed ratios are prepared, the inventory and the occupied fund are huge, and the corresponding market demand is not favorable. The invention adopts a box-separating structure, the reduction box is divided into two detachable parts at the first-stage transmission part, namely a main box body 23 and a sub-box body 24 shown in the figure, after the structure is adopted, a dealer only needs to be equipped with first-stage reduction gears with different speed ratios, when a client needs to adjust the reduction ratio, a bolt for connecting a transmission input assembly 401 with the sub-box body 24 is removed, a first-stage pinion 1 and the transmission input assembly 401 are taken out together, then the bolt for connecting the sub-box body 24 with the main box body 23 is removed, the sub-box body 24 can be removed, then a first-stage large gear shaft 9 and a first-stage large gear 4, a first bearing 6, a second bearing 10 and a second-stage pinion 9 on the first-stage large gear shaft can be directly taken off from the side of the sub-box body, after the first bearing 6 is detached, the first-stage small gear 1 can be conveniently taken off from the first-stage small gear shaft 3, the first-stage small gear 1 and the first-stage large gear 4 with the same center distance can be replaced, the re-mounting completes the adjustment of the reduction ratio.

The split box is beneficial to quickly replacing the first-stage transmission gear, and is convenient for customers to configure the speed ratio.

The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the novel field of the present invention by those skilled in the art are covered by the protection scope of the present invention.

Claims

1. A parallel shaft box-dividing speed reducer comprises a speed reducer case, a plurality of speed reducing gear sets and a connecting sleeve, and is characterized in that the speed reducer case is divided into a main case body and a sub case body which are detachably connected, the interface of the main case body and the sub case body corresponds to the position of a first-stage speed reducing gear set, the connecting sleeve is detachably connected with the sub case body, a pinion of the first-stage speed reducing gear set is detachably arranged on the shaft of the first-stage speed reducing gear set, and a bull gear of the first-stage speed reducing gear set is detachably arranged on the shaft of the bull gear;

2. A parallel-axis box-split reduction gear as claimed in claim 1, wherein the main housing has an open end on a side near the box-split housing, and an intermediate support spacer is provided on a bottom of the open end, and the pinion and the bull gear are located in a space formed by the open end and the box-split housing.

3. The parallel shaft box-split speed reducer of claim 1, wherein the box body is provided with a primary pinion shaft right shaft hole, the side of the main box body close to the box body is provided with an intermediate support baffle plate, and the intermediate support baffle plate is provided with a primary pinion shaft left shaft hole; the left end and the right end of the primary gear shaft are respectively fixed on the branch box body and the main box body through a first bearing and a second bearing.

4. A parallel shaft box reducer according to claim 1 in which the drive input assembly with said pinion gears is mounted on a coupling sleeve, the pinion gears of the first reduction gear set being external to the coupling sleeve.

5. The parallel shaft box-separating speed reducer as claimed in claim 1, wherein the outer end of the pinion shaft of the first reduction gear set extends out of the outer end of the coupling sleeve, and the extending end is provided with a part capable of being coupled with a pulley, a gear or a sprocket.

6. The parallel-shaft box-split speed reducer of claim 1, wherein the box-split body is provided with a primary pinion shaft right shaft hole, the side of the main box body close to the box-split body is provided with an intermediate support partition plate, and the intermediate support partition plate is provided with a primary pinion shaft left shaft hole; the left side shaft shoulder of the second pinion on the one-level gear shaft is contacted with the right side of the inner ring of the second bearing, the left shaft hole of the one-level gear shaft is provided with a second hole retainer ring, the first hole retainer ring, the second hole retainer ring, the first bearing, the second pinion and the first gear shaft are axially fixed on the one-level gear shaft.

7. The parallel shaft box-split speed reducer of claim 1, wherein a side of the main box body close to the box-split body is provided with an intermediate support partition plate, the intermediate support partition plate is provided with a secondary pinion shaft intermediate shaft hole, a side of the main box body away from the box-split body is provided with a secondary pinion shaft left shaft hole, and the box-split body is provided with a secondary pinion shaft right shaft hole;

8. The parallel shaft box-splitting speed reducer of claim 1, wherein a middle supporting clapboard is arranged at one side of the main box body close to the box-splitting body, the middle supporting clapboard is provided with a three-level big gear shaft right shaft hole, and a three-level big gear shaft left shaft hole is arranged at one side of the main box body far from the box-splitting body;