CN216111971U - Novel parallel shaft helical gear speed reducer - Google Patents

Abstract

The utility model relates to a speed reducer, in particular to a novel parallel shaft helical gear speed reducer, which comprises a box body, an input assembly, a transmission assembly and an output assembly, wherein the input assembly comprises an input shaft, a hollow shaft, a first helical gear and a shaft sleeve, the hollow shaft is sleeved outside the input shaft, the first helical gear is arranged outside the hollow shaft, first bearings are respectively arranged between the inner sides of two ends of the hollow shaft and the input shaft, the shaft sleeve is sleeved on the input shaft and positioned between the first bearings at two sides, second bearings are respectively arranged between the outer sides of two ends of the hollow shaft and the box body, one end of the input shaft is an input end, the other end of the input shaft is a first output end, the end part of the first output end is provided with a connecting groove, the end part of the first output end is aligned with the end part of the hollow shaft, pin holes for installing locking pins are radially arranged on the hollow shaft and are just opposite to the first output end, the output assembly comprises an output shaft, and one end of the output shaft is a second output end. The design structure is reasonable in design, the power output mode of the speed reducer can be flexibly adjusted, and the actual use requirement can be favorably met better.

Description

Novel parallel shaft helical gear speed reducer

Technical Field

The utility model relates to the technical field of speed reducers, in particular to a novel parallel shaft helical gear speed reducer.

Background

The speed reducer is used for matching rotating speed and torque between a prime motor and a working machine or an actuating mechanism, is widely applied to modern machinery, can be divided into a general speed reducer and a special speed reducer according to application, the design, manufacture and use characteristics of the general speed reducer and the special speed reducer are different, the speed reducer is an independent closed transmission device between the prime motor and the working machine and is used for reducing the rotating speed and increasing the torque so as to meet working requirements, the most suitable speed reducer is selected according to factors such as selection conditions, technical parameters, performance of a power machine, economy and the like of the working machine when the speed reducer is selected, compared with the factors such as the outline size, transmission efficiency, bearing capacity, quality, price and the like of the speed reducers of different types and varieties, the speed reducer is relatively precise machinery and is used for reducing the rotating speed and increasing the torque, and mainly comprises transmission parts, a shaft, a speed reducer, a shaft and a transmission shaft, Bearing, box and its accessories. The parallel shaft helical gear reducer is an F series reducer in four series reducers of hard tooth surfaces R, F, S and K, and has excellent performance and wide application.

The existing parallel shaft helical gear speed reducer is more traditional in design, the structure is more fixed, the output mode of the speed reducer is single, and the actual use requirement cannot be met well. The present invention improves upon the above-mentioned deficiencies.

Disclosure of Invention

In order to overcome the defects of the background art, the utility model provides the novel parallel shaft helical gear speed reducer which is reasonable in structural design, can flexibly adjust the power output mode of the speed reducer and can be favorable for better meeting the actual use requirements.

The technical scheme adopted by the utility model is as follows: a novel parallel shaft helical gear speed reducer comprises a box body, an input assembly, a transmission assembly and an output assembly, wherein the input assembly comprises an input shaft, a hollow shaft, a first helical gear and a shaft sleeve, the hollow shaft is sleeved outside the input shaft, the first helical gear is fixedly arranged outside the middle part of the hollow shaft, first bearings are respectively arranged between the inner sides of two ends of the hollow shaft and the input shaft, the input shaft is sleeved with the shaft sleeve, the shaft sleeve is positioned between the first bearings at two sides, second bearings are respectively arranged between the outer sides of two ends of the hollow shaft and the box body, one end of the input shaft is an outwards protruding input end, the other end of the input shaft is an outwards protruding first output end, the end part of the first output end is provided with a concave connecting groove, the end part of the first output end is aligned with the end part of the hollow shaft, a pin hole for installing a locking pin is radially arranged on the hollow shaft, the pin hole is just opposite to the first output end of the input shaft, the output assembly comprises an output shaft which is rotatably connected with the box body, and one end of the output shaft is a second output end which protrudes outwards.

Preferably, the input end is arranged to be a connecting flange, a plurality of connecting holes are formed in the connecting flange along the circumferential direction, and the connecting grooves are square grooves.

Preferably, the input shaft is the step shaft, be equipped with first annular step, second annular step, third annular step, transition step and flange from first output end to the input end on the input shaft in proper order, first annular step, second annular step, third annular step, transition step and flange's diameter increases in proper order, and the cover is equipped with on the second annular step the axle sleeve, first annular step with be equipped with between the hollow shaft first bearing and first bearing conflict in the one end of axle sleeve, third annular step with also be equipped with between the hollow shaft first bearing and first bearing one side conflict in the other end of axle sleeve, the opposite side conflict in the inner of transition step, the both ends inboard of hollow shaft all be equipped with the step groove of first bearing adaptation.

Preferably, the pin hole is divided into a first pin hole and a second pin hole, the first pin hole is opposite to the shaft sleeve, and the second pin hole is opposite to the first bearing arranged on the first annular step.

Preferably, the transmission assembly includes transmission shaft and second helical gear, the both ends of transmission shaft with the box rotates to be connected, is equipped with on the transmission shaft second helical gear and transmission shaft key-type connection are equipped with first keyway on the transmission shaft, are equipped with on the second helical gear just right the connection keyway of first keyway, output assembly still includes third helical gear, be equipped with on the output shaft third helical gear and output shaft key-type connection are equipped with the second keyway on the output shaft, are equipped with on the third helical gear just right the connection keyway of second keyway, one side of second helical gear with first helical gear meshes mutually, the opposite side with third helical gear meshes mutually.

Preferably, a plurality of weight reduction grooves are formed in the second helical gear and the third helical gear along the circumferential direction.

Preferably, the weight reducing grooves comprise a weight reducing inner groove and a weight reducing outer groove, the weight reducing inner groove and the weight reducing outer groove are both circular, the diameter of the weight reducing inner groove is smaller than that of the weight reducing outer groove, the weight reducing inner groove is located in the middle, the weight reducing outer groove is arranged on each of two sides of the weight reducing inner groove, and an arc-shaped transition surface is arranged between the weight reducing inner groove and the weight reducing outer groove.

In conclusion, the beneficial effects of the utility model are as follows:

1. when the locking pin is not installed, the hollow shaft and the input shaft can rotate relatively, namely the input shaft cannot drive the hollow shaft to rotate together, only one power output end is arranged at the moment, after the locking pin is installed, the hollow shaft and the input shaft cannot rotate relatively under the locking action of the locking pin, namely the input shaft can drive the hollow shaft to rotate synchronously, when the hollow shaft rotates, the power is transmitted to the transmission assembly through the first bevel gear, the power is transmitted to the output shaft through the transmission assembly, at the moment, two power outputs are arranged, namely the first output end and the second output end, the structural design is reasonable, the power output mode of the speed reducer can be flexibly adjusted through whether the locking pin is installed, and the actual use requirement can be favorably met;

2. the first pin hole and the second pin hole are positioned on the outer side of the box body, so that the locking pin can be conveniently installed or disassembled in actual use, when the locking pin is installed in the first pin hole, the inner end of the locking pin can abut against the shaft sleeve, synchronous rotation of the input shaft and the hollow shaft can be favorably realized through pressing the shaft sleeve, when the locking pin is installed in the second pin hole, the inner end of the locking pin can abut against the first bearing, and synchronous rotation of the input shaft and the hollow shaft can be favorably realized through pressing the first bearing on one side;

3. the weight of the second helical gear can be effectively reduced by uniformly arranging the plurality of weight reducing grooves on the second helical gear along the circumferential direction, the energy consumed by transmission can be favorably reduced, the weight of the third helical gear can be effectively reduced by uniformly arranging the plurality of weight reducing grooves on the third helical gear along the circumferential direction, the energy consumed by transmission can be favorably reduced, and the energy consumed by transmission can be favorably and better realized for energy conservation and environmental protection.

The utility model is further described with reference to the following figures and detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an internal structure of the present invention;

FIG. 2 is an external view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

FIG. 5 is an enlarged view of a portion of FIG. 1 at C;

marked in the figure, 1-a box body, 2-an input shaft, 3-a hollow shaft, 4-a first bevel gear, 5-a shaft sleeve, 6-a first bearing, 7-a second bearing, 8-a connecting groove, 9-an output shaft, 10-a second output end, 11-a connecting flange, 12-a connecting hole, 13-a first annular step, 14-a second annular step, 15-a third annular step, 16-a transition step, 17-a first pin hole, 18-a second pin hole, 19-a transmission shaft, 20-a second bevel gear, 21-a first key groove, 22-a third bevel gear, 23-a second key groove, 24-a lightening groove, 25-a lightening inner groove, 26-a lightening outer groove, 27-an arc transition surface and 28-a shaft retainer ring, 29-retainer ring for hole and 30-step groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 5 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1 to 5, the novel parallel shaft helical gear speed reducer disclosed in this embodiment includes a case 1, an input assembly, a transmission assembly, and an output assembly, where the input assembly includes an input shaft 2, a hollow shaft 3, a first helical gear 4, and a shaft sleeve 5, the hollow shaft 3 is sleeved on the outer side of the input shaft 2, the first helical gear 4 is fixedly disposed on the outer side of the middle portion of the hollow shaft 3, first bearings 6 are respectively disposed between the inner sides of both ends of the hollow shaft 3 and the input shaft 2, the input shaft 2 is sleeved with the shaft sleeve 5, the shaft sleeve 5 is located between the first bearings 6 on both sides, second bearings 7 are respectively disposed between the outer sides of both ends of the hollow shaft 3 and the case 1, one end of the input shaft 2 is an outwardly protruding input end, the other end is an outwardly protruding first output end, and an end of the first output end is provided with a concave connection groove 8, the end part of the first output end is aligned with the end part of the hollow shaft 3, pin holes for installing locking pins are radially arranged on the hollow shaft 3, the pin holes are opposite to the first output end of the input shaft 2, the output assembly comprises an output shaft 9 which is rotatably connected with the box body 1, and one end of the output shaft 9 is a second output end 10 which protrudes outwards. In the technical scheme, the input end of the input shaft 2 is connected with a driving motor for providing power input, the second bearing 7 is arranged to enable the hollow shaft 3 to rotate well on the box body 1, the first bearing 6 is arranged to enable the input shaft 2 to rotate well in the middle of the hollow shaft 3, the shaft sleeve 5 is arranged to play a role of limiting and supporting well, the end part of the first output end is aligned with the end part of the hollow shaft 3 and protrudes outwards to enable the pin hole to be positioned outside the box body 1, the locking pin can be installed or disassembled conveniently, the end part of the first output end can realize power output conveniently through the concave connecting groove 8, the hollow shaft 3 and the input shaft 2 can rotate relatively when the locking pin is not installed, namely the input shaft 2 cannot drive the hollow shaft 3 to rotate together, only one power output is provided at the moment, and the hollow shaft 3 and the input shaft 2 cannot rotate relatively under the locking action of the locking pin after the locking pin is installed, input shaft 2 can drive hollow shaft 3 synchronous rotation promptly, transmits power to drive assembly through first helical gear 4 when hollow shaft 3 rotates, through drive assembly with power transmission to output shaft 9 on, there are two power take off this moment, first output and second output 10 promptly, above-mentioned structural design is reasonable, can adjust the power take off mode of speed reducer through whether installing the fitting pin in a flexible way, can be favorable to satisfying the in-service use demand better. In this embodiment, the power output provided by the first output end is direct output, and does not pass through a transmission link and reduce the rotation speed, and the power output provided by the second output end 10 is indirect output, and needs to pass through the transmission link, and can reduce the rotation speed according to actual requirements and increase the torque, so that the power output mode of the speed reducer is more flexible, and both the first output end and the second output end 10 can be used simultaneously, and the first output end or the second output end 10 can also be used independently. In order to have a better locking effect during specific implementation, the locking pin can also directly adopt a locking bolt, the pin hole is a threaded hole matched with the locking bolt, and the locking part between the space-time spindle 3 and the input shaft 2 during specific implementation can be not limited to a locking pin structure, and can also adopt locking parts in other structural forms. The box body 1, the input shaft 2, the hollow shaft 3, the bevel gear, the bearing and the shaft sleeve 5 can all refer to the prior art, and are not further described herein.

As a preferred technical solution, the input end is provided as a connecting flange 11, a plurality of connecting holes 12 are circumferentially provided on the connecting flange 11, and the connecting groove 8 is provided as a square groove. In this embodiment, the input end on the input shaft 2 adopts flange 11, and connecting hole 12 on flange 11 is the screw hole, can conveniently connect the shaft joint through flange 11, can be convenient for connect driving motor and provide power input, and the spread groove 8 of first output end adopts square groove can be convenient for connect, can be convenient for provide power output. During specific implementation, the square groove can be used as an input end to be connected with the driving motor, and the connecting flange 11 can be used as an output end to provide power output. The connecting flange 11 and the square groove are referred to the prior art and will not be further described herein.

As a preferable technical solution, the input shaft 2 is a stepped shaft, a first annular step 13, a second annular step 14, a third annular step 15, a transition step 16 and the connecting flange 11 are sequentially arranged on the input shaft 2 from a first output end to an input end, the diameters of the first annular step 13, the second annular step 14, the third annular step 15, the transition step 16 and the connecting flange 11 are sequentially increased, the shaft sleeve 5 is sleeved on the second annular step 14, the first bearing 6 and the first bearing 6 are arranged between the first annular step 13 and the hollow shaft 3 and are abutted against one end of the shaft sleeve 5, the first bearing 6 and one side of the first bearing 6 are also arranged between the third annular step 15 and the hollow shaft 3 and are abutted against the other end of the shaft sleeve 5, and the other side is abutted against the inner end of the transition step 16, the inner sides of the two ends of the hollow shaft 3 are provided with step grooves 30 matched with the first bearing 6. In this embodiment, install two first bearings 6 side by side between the step groove 30 of first annular step 13 and hollow shaft 3 one end, also install two first bearings 6 side by side between the step groove 30 of third annular step 15 and hollow shaft 3 one end, 2 both ends of input shaft all set up two first bearings 6 and support, the supporting effect is good, can be convenient for input shaft 2 to rotate better in the middle part of hollow shaft 3, can install axle sleeve 5 well on second annular step 14, the both ends of axle sleeve 5 are contradicted respectively in the first bearings 6 of both sides, it can play spacing supporting role well to set up axle sleeve 5, the inner of transition step 16 is contradicted in the first bearing 6 of installation on third annular step 15, can play spacing supporting role well, therefore can know the ladder shaft structure reasonable in design that input shaft 2 adopted, can be convenient for assemble better. In a specific implementation, a shaft retainer 28 and a hole retainer 29 are mounted outside the first bearing 6 mounted on the first annular step 13, and reference is made to the prior art, and no further description is provided here.

As a preferable technical solution, the pin holes are divided into a first pin hole 17 and a second pin hole 18, the first pin hole 17 faces the shaft sleeve 5, and the second pin hole 18 faces the first bearing 6 mounted on the first annular step 13. In this embodiment, the first pin hole 17 and the second pin hole 18 are both located at the outer side of the box body 1, so that the locking pin can be conveniently installed or detached in actual use, when the locking pin is installed in the first pin hole 17, the inner end of the locking pin can tightly abut against the shaft sleeve 5, the synchronous rotation of the input shaft 2 and the hollow shaft 3 can be realized by pressing the shaft sleeve 5, the second pin hole 18 is over against the middle parts of the two first bearings 6 on the first annular step 13, when the locking pin is arranged in the second pin hole 18, the inner end of the locking pin can simultaneously abut against the two first bearings 6 which are arranged side by side, the two first bearings 6 on one side are pressed to be beneficial to realizing the synchronous rotation of the input shaft 2 and the hollow shaft 3, the structural design is reasonable, through the arrangement of the first pin hole 17 and the second pin hole 18, the synchronous rotation of the input shaft 2 and the hollow shaft 3 can be better realized after the locking pin is installed, and the power output of the second output end 10 on the output shaft 9 can be conveniently realized. In specific implementation, the number and the positions of the first pin holes 17 and the second pin holes 18 can be adjusted according to actual working conditions, and are not further described herein.

As a preferred technical scheme, the transmission assembly comprises a transmission shaft 19 and a second helical gear 20, two ends of the transmission shaft 19 are rotatably connected with the box body 1, the transmission shaft 19 is provided with the second helical gear 20, the second helical gear 20 is in key connection with the transmission shaft 19, the transmission shaft 19 is provided with a first key slot 21, the second helical gear 20 is provided with a connecting key slot right facing the first key slot 21, the output assembly further comprises a third helical gear 22, the output shaft 9 is provided with the third helical gear 22, the third helical gear 22 is in key connection with the output shaft 9, the output shaft 9 is provided with a second key slot 23, the third helical gear 22 is provided with a connecting key slot right facing the second key slot 23, one side of the second helical gear 20 is engaged with the first helical gear 4, and the other side is engaged with the third helical gear 22. In this embodiment, the key installed in the first key groove 21 of the transmission shaft 19 is just snapped into the connecting key groove of the second helical gear 20, the transmission shaft 19 and the second bevel gear 20 can rotate together through key connection, keys arranged in a second key groove 23 on the output shaft 9 are just clamped into a connecting key groove on a third bevel gear 22, the output shaft 9 and the third bevel gear 22 can rotate together through key connection, since both sides of the second helical gear 20 are engaged with the first helical gear 4 and the third helical gear 22 respectively, when the hollow shaft 3 is driven to synchronously rotate by the input shaft 2, the first bevel gear 4 on the outer side of the hollow shaft 3 drives the second bevel gear 20 to rotate, the second bevel gear 20 synchronously drives the third bevel gear 22 to rotate, and the third bevel gear 22 drives the output shaft 9 to rotate together when rotating, so that the second output end 10 of the output shaft 9 can well realize power output.

Preferably, a plurality of weight reduction grooves 24 are formed in each of the second helical gear 20 and the third helical gear 22 along the circumferential direction. In the present embodiment, the weight of the second helical gear 20 can be effectively reduced by uniformly providing the plurality of weight-reducing grooves 24 on the second helical gear 20 in the circumferential direction, which can be advantageous for reducing the energy consumed by the transmission, and the weight of the third helical gear 22 can be effectively reduced by uniformly providing the plurality of weight-reducing grooves 24 on the third helical gear 22 in the circumferential direction, which can be advantageous for reducing the energy consumed by the transmission, which can be advantageous for better energy saving and environmental protection.

Preferably, the lightening slots 24 include a lightening inner slot 25 and a lightening outer slot 26, the lightening inner slot 25 and the lightening outer slot 26 are both circular, the diameter of the lightening inner slot 25 is smaller than that of the lightening outer slot 26, the lightening inner slot 25 is located in the middle, the lightening outer slot 26 is respectively arranged on two sides of the lightening inner slot 25, and an arc-shaped transition surface 27 is arranged between the lightening inner slot 25 and the lightening outer slot 26. In this embodiment, the diameter of the inner weight reducing groove 25 in the middle is smaller, so that the structural strength of the helical gear can be better ensured, and weight reduction can be effectively realized, the diameters of the outer weight reducing grooves 26 on both sides are larger, and the inner weight reducing groove 25 and the outer weight reducing grooves 26 are transited through the arc-shaped transition surface 27, so that the structural strength of the helical gear can be better ensured, and weight reduction can also be effectively realized, and the structural design of the weight reducing groove 24 is reasonable, so that the structural strength of the helical gear can be effectively ensured while weight reduction is realized, and thus the actual requirements can be better met.

The working principle is as follows: the connecting flange 11 on the input shaft 2 can be well connected with a driving motor for providing power input, because the hollow shaft 3 can well rotate on the box body 1, and the input shaft 2 can well rotate in the middle of the hollow shaft 3, the hollow shaft 3 and the input shaft 2 can relatively rotate when the locking pin is not installed, namely the input shaft 2 can not drive the hollow shaft 3 to rotate together, at the moment, the speed reducer only provides one power output at the first output end, after the locking pin is installed, the hollow shaft 3 and the input shaft 2 can not relatively rotate under the locking action of the locking pin, namely, the input shaft 2 can drive the hollow shaft 3 to synchronously rotate, the hollow shaft 3 drives the second helical gear 20 through the first helical gear 4 when rotating, and drives the third helical gear 22 to drive the output shaft 9 to rotate through the second helical gear 20, at the moment, the speed reducer provides two power outputs, namely, the first output end and the second output end 10, the speed reducer is reasonable in structural design, the power output mode of the speed reducer can be flexibly adjusted by installing the locking pin, and the actual use requirement can be favorably and better met.

The fixing manner or the fixing connection manner that is not described in this embodiment may be threaded connection or welding, or other existing connection manners may be adopted according to specific positions, and both threaded connection and welding belong to the prior art, and are not specifically described herein.

The parts not referred to in the present embodiment are the same as or can be implemented by the prior art, and will not be further described here.

The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concept is not limited to this embodiment, and any modification which uses the inventive concept is intended to be included within the scope of the appended claims.

Claims (7)

1. The utility model provides a novel parallel shaft helical gear speed reducer which characterized in that: the input assembly comprises an input shaft, a hollow shaft, a first helical gear and a shaft sleeve, the hollow shaft is sleeved outside the input shaft, the first helical gear is fixedly arranged outside the middle part of the hollow shaft, first bearings are respectively arranged between the inner sides of two ends of the hollow shaft and the input shaft, the shaft sleeve is sleeved on the input shaft and positioned between the first bearings at two sides, second bearings are respectively arranged between the outer sides of two ends of the hollow shaft and the box body, one end of the input shaft is an outward protruding input end, the other end of the input shaft is an outward protruding first output end, the end part of the first output end is provided with a concave connecting groove, the end part of the first output end is aligned with the end part of the hollow shaft, a pin hole for installing a locking pin is radially arranged on the hollow shaft, and the pin hole is just opposite to the first output end part of the input shaft, the output assembly comprises an output shaft which is rotatably connected with the box body, and one end of the output shaft is a second output end which protrudes outwards.

2. The novel parallel shaft helical gear reducer according to claim 1, characterized in that: the input sets up to flange, and flange is last to be equipped with a plurality of connecting holes along circumference, the spread groove sets up to square groove.

3. The novel parallel shaft helical gear reducer according to claim 2, characterized in that: the input shaft is the step shaft, from first output end to the input end on the input shaft be equipped with first annular step, second annular step, third annular step, transition step in proper order and flange, the diameter of first annular step, second annular step, third annular step, transition step and flange increases in proper order, and the cover is equipped with on the second annular step the axle sleeve, first annular step with be equipped with between the hollow shaft first bearing and first bearing conflict in the one end of axle sleeve, third annular step with also be equipped with between the hollow shaft first bearing and first bearing one side conflict in the other end of axle sleeve, opposite side conflict in the inner of transition step, the both ends inboard of hollow shaft all be equipped with the step groove of first bearing adaptation.

4. The novel parallel shaft helical gear reducer according to claim 3, characterized in that: the pin holes are divided into a first pin hole and a second pin hole, the first pin hole is over against the shaft sleeve, and the second pin hole is over against the first bearing arranged on the first annular step.

5. The novel parallel shaft helical gear reducer according to any one of claims 1 to 4, wherein: the transmission assembly comprises a transmission shaft and a second helical gear, the two ends of the transmission shaft are rotatably connected with the box body, the transmission shaft is provided with the second helical gear, the second helical gear is in key connection with the transmission shaft, the transmission shaft is provided with a first key groove, the second helical gear is provided with a right connecting key groove of the first key groove, the output assembly further comprises a third helical gear, the output shaft is provided with the third helical gear, the third helical gear is in key connection with the output shaft, the output shaft is provided with a second key groove, the third helical gear is provided with a right connecting key groove of the second key groove, one side of the second helical gear is meshed with the first helical gear, and the other side of the second helical gear is meshed with the third helical gear.

6. The novel parallel shaft helical gear reducer according to claim 5, wherein: and a plurality of weight reduction grooves are formed in the second helical gear and the third helical gear along the circumferential direction.

7. The novel parallel shaft helical gear reducer according to claim 6, wherein: subtract heavy inslot and subtract heavy ectosome, it all is circular and subtracts the diameter that the diameter of heavy inside lot is less than and subtracts the diameter of heavy ectosome to subtract heavy inside lot with subtracting heavy ectosome, it is middle to subtract heavy inside lot, subtracts the both sides of heavy inside lot and respectively establishes one subtract heavy ectosome, subtract and be equipped with the arc transition face between heavy inside lot and the weight of subtracting the outer trotter.

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